IT1284007B1 - Procedimento per la preparazione di un materiale micro-meso poroso ad alta area superficiale con distribuzione controllata della - Google Patents

Procedimento per la preparazione di un materiale micro-meso poroso ad alta area superficiale con distribuzione controllata della

Info

Publication number
IT1284007B1
IT1284007B1 IT96MI001202A ITMI961202A IT1284007B1 IT 1284007 B1 IT1284007 B1 IT 1284007B1 IT 96MI001202 A IT96MI001202 A IT 96MI001202A IT MI961202 A ITMI961202 A IT MI961202A IT 1284007 B1 IT1284007 B1 IT 1284007B1
Authority
IT
Italy
Prior art keywords
procedure
preparation
surface area
high surface
controlled distribution
Prior art date
Application number
IT96MI001202A
Other languages
English (en)
Inventor
Carlo Perego
Angela Carati
Original Assignee
Eniricerche Spa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eniricerche Spa filed Critical Eniricerche Spa
Publication of ITMI961202A0 publication Critical patent/ITMI961202A0/it
Priority to IT96MI001202A priority Critical patent/IT1284007B1/it
Priority to EP97108185A priority patent/EP0812804B1/en
Priority to DE69705264T priority patent/DE69705264T2/de
Priority to ES97108185T priority patent/ES2158404T3/es
Priority to TW086106904A priority patent/TW440466B/zh
Priority to US08/866,057 priority patent/US6071485A/en
Priority to JP9153874A priority patent/JPH1067512A/ja
Priority to CN97113214A priority patent/CN1090993C/zh
Priority to KR1019970024321A priority patent/KR980000577A/ko
Publication of ITMI961202A1 publication Critical patent/ITMI961202A1/it
Application granted granted Critical
Publication of IT1284007B1 publication Critical patent/IT1284007B1/it

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/04—Mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/16—Alumino-silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28057—Surface area, e.g. B.E.T specific surface area
    • B01J20/28064—Surface area, e.g. B.E.T specific surface area being in the range 500-1000 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28057—Surface area, e.g. B.E.T specific surface area
    • B01J20/28066—Surface area, e.g. B.E.T specific surface area being more than 1000 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28069—Pore volume, e.g. total pore volume, mesopore volume, micropore volume
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28078—Pore diameter
    • B01J20/2808—Pore diameter being less than 2 nm, i.e. micropores or nanopores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28078—Pore diameter
    • B01J20/28083—Pore diameter being in the range 2-50 nm, i.e. mesopores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/08—Silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/12—Silica and alumina
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61—Surface area
    • B01J35/615—100-500 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61—Surface area
    • B01J35/618—Surface area more than 1000 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/63—Pore volume
    • B01J35/635—0.5-1.0 ml/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/63—Pore volume
    • B01J35/638—Pore volume more than 1.0 ml/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/64—Pore diameter
    • B01J35/647—2-50 nm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/03—Precipitation; Co-precipitation
    • B01J37/031—Precipitation
    • B01J37/033—Using Hydrolysis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/03—Precipitation; Co-precipitation
    • B01J37/036—Precipitation; Co-precipitation to form a gel or a cogel
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B37/00—Compounds having molecular sieve properties but not having base-exchange properties

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Dispersion Chemistry (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Catalysts (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Medicinal Preparation (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
IT96MI001202A 1996-06-13 1996-06-13 Procedimento per la preparazione di un materiale micro-meso poroso ad alta area superficiale con distribuzione controllata della IT1284007B1 (it)

Priority Applications (9)

Application Number Priority Date Filing Date Title
IT96MI001202A IT1284007B1 (it) 1996-06-13 1996-06-13 Procedimento per la preparazione di un materiale micro-meso poroso ad alta area superficiale con distribuzione controllata della
EP97108185A EP0812804B1 (en) 1996-06-13 1997-05-21 Process for the preparation of a micro-meso porous material with a high surface area and controlled distribution of the porosity
DE69705264T DE69705264T2 (de) 1996-06-13 1997-05-21 Verfahren zur Herstellung von einem Mikro-mesoporösen Material mit hoher spezifischer Oberfläche und kontrollierter Porositätsverteilung
ES97108185T ES2158404T3 (es) 1996-06-13 1997-05-21 Procedimiento para la preparacion de un material micro-mesoporoso con una superficie especifica elevada y una distribucion controlada de la porosidad.
TW086106904A TW440466B (en) 1996-06-13 1997-05-22 Process for the preparation of a micro-meso porous material with a high surface area and controlled distribution of the porosity
US08/866,057 US6071485A (en) 1996-06-13 1997-05-30 Process for the preparation of a micro-meso porous material with a high surface area and controlled distribution of the porosity
JP9153874A JPH1067512A (ja) 1996-06-13 1997-06-11 大表面積および制御された細孔分布を有する微小−中間細孔材料の製造法
CN97113214A CN1090993C (zh) 1996-06-13 1997-06-12 具有高表面积和可控制的多孔性分布的一种微－中孔材料的制备方法
KR1019970024321A KR980000577A (ko) 1996-06-13 1997-06-12 고표면적 및 다공성의 조절된 분포를 갖는 마이크로-메소 다공성 물질의 제조 방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT96MI001202A IT1284007B1 (it) 1996-06-13 1996-06-13 Procedimento per la preparazione di un materiale micro-meso poroso ad alta area superficiale con distribuzione controllata della

Publications (3)

Publication Number Publication Date
ITMI961202A0 ITMI961202A0 (it) 1996-06-13
ITMI961202A1 ITMI961202A1 (it) 1997-12-13
IT1284007B1 true IT1284007B1 (it) 1998-05-08

Family

ID=11374418

Family Applications (1)

Application Number Title Priority Date Filing Date
IT96MI001202A IT1284007B1 (it) 1996-06-13 1996-06-13 Procedimento per la preparazione di un materiale micro-meso poroso ad alta area superficiale con distribuzione controllata della

Country Status (9)

Country Link
US (1) US6071485A (it)
EP (1) EP0812804B1 (it)
JP (1) JPH1067512A (it)
KR (1) KR980000577A (it)
CN (1) CN1090993C (it)
DE (1) DE69705264T2 (it)
ES (1) ES2158404T3 (it)
IT (1) IT1284007B1 (it)
TW (1) TW440466B (it)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0987220A1 (en) * 1998-09-17 2000-03-22 Technische Universiteit Delft Mesoporous amorphous silicate materials and process for the preparation thereof
US6096469A (en) * 1999-05-18 2000-08-01 3M Innovative Properties Company Ink receptor media suitable for inkjet printing
IT1314263B1 (it) * 1999-12-03 2002-12-06 Enichem Spa Processo per la preparazione di catalizzatori zeolitici.
EP1332795A1 (en) * 2002-02-01 2003-08-06 Centre National De La Recherche Scientifique (Cnrs) New porous silicate materials and their uses as catalytic systems for diesel improvement
ITMI20051295A1 (it) 2005-07-08 2007-01-09 Eni Spa Processo per migliorare le qualita' come carburante di miscele idrocarburiche idrotrattate
DE102005049362A1 (de) * 2005-10-12 2007-04-19 Basf Ag Verfahren zur Herstellung eines Silikates
IT1392165B1 (it) 2008-12-01 2012-02-22 Eni Spa Processo per la separazione di gas
IT1392194B1 (it) 2008-12-12 2012-02-22 Eni Spa Processo per la produzione di idrocarburi, utili per autotrazione, da miscele di origine biologica
IT1392806B1 (it) 2009-02-02 2012-03-23 Eni Spa Processo integrato di cracking catalitico a letto fluido per ottenere miscele idrocarburiche con elevate qualita' come carburante
IT1396939B1 (it) 2009-12-09 2012-12-20 Eni Spa Composizione idrocarburica utile come carburante o combustibile
IT1402865B1 (it) 2010-11-05 2013-09-27 Univ Roma Procedimento per il trattamento di acqua contaminata
IT1403895B1 (it) 2010-12-29 2013-11-08 Eni Spa Processo e sistema catalitico per migliorare le qualita' come carburante di miscele idrocarburiche
WO2015107487A1 (en) 2014-01-20 2015-07-23 Eni S.P.A. Process for the production of hydrocarbon fractions from mixtures of a biological origin
EP4257662B1 (en) 2014-05-29 2025-11-05 ENI S.p.A. Process for producing a diesel hydrocarbon fraction starting from a renewable feedstock
WO2015181744A1 (en) 2014-05-29 2015-12-03 Eni S.P.A. Process for producing a diesel hydrocarbon fraction starting from a renewable feedstock
ES2860924T3 (es) 2014-05-29 2021-10-05 Eni Spa Proceso para producir una fracción de hidrocarburo diésel a partir de una materia prima renovable

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1150712A (en) * 1979-12-07 1983-07-26 William J. Ball Process for the production of crystalline aluminosilicates and their use as catalysts and catalyst supports
IT1219692B (it) * 1988-05-06 1990-05-24 Eniricerche Spa Gel di silice e allumina cataliticamente attivo e procedimento per la sua preparazione
GB8821237D0 (en) * 1988-09-09 1988-10-12 Shell Int Research Novel crystalline(metallo)silicates & process for preparing such(metallo)silicates
IT1244478B (it) * 1990-12-21 1994-07-15 Eniricerche Spa Gel cataliticamente attivo e procedimento per la sua preparazione
IT1256084B (it) * 1992-07-31 1995-11-27 Eniricerche Spa Catalizzatore per la idroisomerizzazione di normal-paraffine a catena lunga e procedimento per la sua preparazione
IT1255526B (it) * 1992-09-29 1995-11-09 Eniricerche Spa Procedimento per la preparazione di un catalizzatore efficace nella idroisomerizzazione di normal-paraffine
IT1264031B (it) * 1993-04-08 1996-09-09 Eniricerche Spa Processo per la produzione di benzine e jet fuel a partire da n-butano
IT1265320B1 (it) * 1993-12-22 1996-10-31 Eniricerche Spa Procedimento per la preparazione di silico-allumine amorfe cataliticamente attive
IT1270069B (it) * 1994-07-06 1997-04-28 Eniricerche Spa Gel micro-mesoporoso e procedimento per la sua preparazione
IT1273514B (it) * 1995-04-07 1997-07-08 Eniricerche Spa Procedimento per la preparazione di un gel micro-mesoporoso

Also Published As

Publication number Publication date
ITMI961202A1 (it) 1997-12-13
ES2158404T3 (es) 2001-09-01
EP0812804A1 (en) 1997-12-17
EP0812804B1 (en) 2001-06-20
ITMI961202A0 (it) 1996-06-13
JPH1067512A (ja) 1998-03-10
DE69705264T2 (de) 2002-01-03
CN1090993C (zh) 2002-09-18
TW440466B (en) 2001-06-16
KR980000577A (ko) 1998-03-30
DE69705264D1 (de) 2001-07-26
US6071485A (en) 2000-06-06
CN1173395A (zh) 1998-02-18

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