DK2995367T3 - Kobberkatalysator der er understøttet af molekylsigte med små porer med bestandighed mod mager/fed aldring til reduktion af nitrogenoxider - Google Patents

Kobberkatalysator der er understøttet af molekylsigte med små porer med bestandighed mod mager/fed aldring til reduktion af nitrogenoxider Download PDF

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DK2995367T3
DK2995367T3 DK15189846.7T DK15189846T DK2995367T3 DK 2995367 T3 DK2995367 T3 DK 2995367T3 DK 15189846 T DK15189846 T DK 15189846T DK 2995367 T3 DK2995367 T3 DK 2995367T3
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catalyst
cha
molecular sieve
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chemical process
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DK15189846.7T
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Paul Joseph Andersen
Hai-Ying Chen
Joseph Fedeyko
Erich Weigert
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Johnson Matthey Plc
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    • B01J29/041—Mesoporous materials having base exchange properties, e.g. Si/Al-MCM-41
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    • B01J29/044—Iron group metals or copper
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/30—After treatment, characterised by the means used
    • B01J2229/42—Addition of matrix or binder particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J29/00—Catalysts comprising molecular sieves
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    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
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Claims (13)

1. Kemisk fremgangsmåde til behandling af udstødningsgas fra et køretøjs forbrændingsmotor med en mager/fed-cyklus ved anvendelse af en katalysator til selektiv katalytisk reduktion (SCR), hvilken kemisk fremgangsmåde omfatter: at danne et NH3-nitrogenholdigt reduktionsmiddel over en NOx-adsorber-kataly-sator (NAC) under periodiske fedt-regenereringshændelser, at udsætte SCR-ka-talysatoren i et NAC + (nedstrøms)-SCR-katalysatorsystem for mindst en reaktant der indbefatter nitrogenoxider, og at reducere nitrogenoxiderne med det Nhh-nitrogenholdige reduktionsmidlet der er dannet over NAC’en under de periodiske fedt-regenereringshændelser, hvilken SCR-katalysator omfatter kobber og en molekylsigte med små porer og har en maksimal ringstørrelse på otte tetraederi-ske atomer, og hvor yderligere nitrogenholdigt reduktionsmiddel kun doseres til en flydende udstødningsgas, når SCR-katalysatoren er ved over 100 °C.
2. Kemisk fremgangsmåde ifølge krav 1, hvor det nitrogenholdige reduktionsmiddel kun doseres i den flydende udstødningsgas, når SCR-katalysatoren er ved over 150 °C.
3. Kemisk fremgangsmåde ifølge krav 1 eller 2, hvor en kilde til yderligere nitrogenholdigt reduktionsmiddel er ammoniak per se, hydrazin, urinstof ((NH2)2CO)), ammoniumcarbonat, ammoniumcarbamat, ammoniumhydrogencarbonat eller ammoniumformiat.
4. Kemisk fremgangsmåde ifølge krav 1,2 eller 3, hvor molekylsigterne med små porer der indeholder en maksimal ringstørrelse på otte tetraederiske atomer er valgt fra gruppen af rammetypekoder, der indeholder CHA, LEV, ERI og DDR.
5. Kemisk fremgangsmåde ifølge krav 1,2, 3 eller 4, hvor molekylsigterne med små porer der indeholder en maksimal ringstørrelse på otte tetraederiske atomer har rammetypekoden CHA.
6. Kemisk fremgangsmåde ifølge krav 4 eller 5, hvor molekylsigten med små porer af rammetypekoden CHA er AIPO-34, [AI-As-0]-CHA, [Al-Co-P-0]-CHA, |Co|[Be-P-0]-CHA, |C03(C6N4H24)3(H2O)9[Bei8Pi8O72]-CHA, [Co-AI-P-0]-CHA, |Li-Na|[AI-Si-0]-CHA, [Mg-AI-PO]-CHA, [Si-0]-CHA, [Zn-AI-PO]-CHA, [Zn-As-O]-CHA, CoAPO-44, CoAPO-47, DAF-5, GaPO-34, K-chabazit, Linde D, Linde R, LZ-218, MeAPO-47, MeAPSO-47, (Ni(deta)2)-UT-6, Phi, SAPO-34, SAPO-47, SSZ-13, UiO-21, Willhendersonite, ZK-14 eller ZYT-6.
7. Kemisk fremgangsmåde ifølge et hvilket som helst af de foregående krav, hvor molekylsigten med små porer er en aluminosilicat-molekylsigte og har et forhold mellem siliciumdioxid og aluminiumoxid på 8 til 150.
8. Kemisk fremgangsmåde ifølge et hvilket som helst af de foregående krav, hvor det totale kobber-indhold i molekylsigten med små porer er fra 0,5 til 5 vægt-%.
9. Kemisk fremgangsmåde ifølge et hvilket som helst af de foregående krav, hvor den NOx-adsorberende katalysator omfatter et ædelmetal og et basismateriale, der er valgt fra gruppen som består af et alkalimetal, et jordal kali metal og et metal af de sjældne jordarter.
10. Kemisk fremgangsmåde ifølge et hvilket som helst af de foregående krav, hvor NH3-SCR-katalysatoren belægges på en substratmonolit.
11. Kemisk fremgangsmåde ifølge et hvilket som helst af kravene 1 til 9, hvor NH3-SCR-katalysatoren dannes som en katalysator af ekstruderet type.
12. Kemisk fremgangsmåde ifølge krav 10, hvor substratmonolitten er et filtermo-nolit-substrat.
13. Kemisk fremgangsmåde ifølge et hvilket som helst af de foregående krav, hvor udstødningsgassen er fra et køretøjs dieselmotor, benzinmotor eller en motor, der er drevet af flydende petroleumsgas eller naturgas.
DK15189846.7T 2009-04-17 2010-04-19 Kobberkatalysator der er understøttet af molekylsigte med små porer med bestandighed mod mager/fed aldring til reduktion af nitrogenoxider DK2995367T3 (da)

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