NOx reduction from diesel emissions over a non-transition metal zeolite catalyst: Effect of water in the feed

Bin Wen; Young Hoon Yeom; Eric Weitz; Wolfgang M.H. Sachtler

doi:10.1016/j.apcatb.2003.09.018

NO_x reduction from diesel emissions over a non-transition metal zeolite catalyst: Effect of water in the feed

Bin Wen, Young Hoon Yeom, Eric Weitz, Wolfgang M.H. Sachtler^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

NO reduction activity with acetaldehyde over BaY is low in a dry feed, but significantly higher in the presence of water vapor. Aldol condensation of acetaldehyde takes place, polymerization of the resulting crotonaldehyde deactivates the catalyst. Water vapor prevents the formation of large amounts of carbonaceous deposits, either by suppressing the dehydration of aldol to crotonadehyde or by interacting with carbonaceous deposits or their precursors, transforming them to CO, CO₂ and H_2. Temperature- programmed oxidation (TPO) shows much lower coke formation after tests in the presence of water vapor. TPD-MS data show that nitromethane, a possible intermediate in the NO_x reduction process, reacts with water on BaY forming NH₃, CO_x and isocyanic acid HNCO. NO_x conversion over BaY reaches values near 90% at 200°C and a GHSV of 30,000h^-1 if the NO_x initially contains both NO and NO₂. No transition metal is involved in the reduction of NO _x to NH₃ and N₂ over BaY.

Original language	English (US)
Pages (from-to)	125-131
Number of pages	7
Journal	Applied Catalysis B: Environmental
Volume	48
Issue number	2
DOIs	https://doi.org/10.1016/j.apcatb.2003.09.018
State	Published - Mar 18 2004

Keywords

Aldol condensation over BaY
BaY catalyst
Diesel emission
NO reduction with acetaldehyde

ASJC Scopus subject areas

Catalysis
General Environmental Science
Process Chemistry and Technology

Access to Document

10.1016/j.apcatb.2003.09.018

Cite this

@article{2803185279c6469bb1acf27eb8c6b59d,

title = "NOx reduction from diesel emissions over a non-transition metal zeolite catalyst: Effect of water in the feed",

abstract = "NO reduction activity with acetaldehyde over BaY is low in a dry feed, but significantly higher in the presence of water vapor. Aldol condensation of acetaldehyde takes place, polymerization of the resulting crotonaldehyde deactivates the catalyst. Water vapor prevents the formation of large amounts of carbonaceous deposits, either by suppressing the dehydration of aldol to crotonadehyde or by interacting with carbonaceous deposits or their precursors, transforming them to CO, CO2 and H2. Temperature- programmed oxidation (TPO) shows much lower coke formation after tests in the presence of water vapor. TPD-MS data show that nitromethane, a possible intermediate in the NOx reduction process, reacts with water on BaY forming NH3, COx and isocyanic acid HNCO. NOx conversion over BaY reaches values near 90% at 200°C and a GHSV of 30,000h-1 if the NOx initially contains both NO and NO2. No transition metal is involved in the reduction of NO x to NH3 and N2 over BaY.",

keywords = "Aldol condensation over BaY, BaY catalyst, Diesel emission, NO reduction with acetaldehyde",

author = "Bin Wen and Yeom, {Young Hoon} and Eric Weitz and Sachtler, {Wolfgang M.H.}",

note = "Funding Information: This work was supported by the EMSI program of the National Science Foundation and the US Department of Energy Office of Science (CHE-9810378) at the Northwestern University Institute for Environmental Catalysis. Financial aid from the Director of the Chemistry Division, Basic Energy Sciences, US Department of Energy, grant DE-FGO2-87ER13654, is gratefully acknowledged.",

year = "2004",

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doi = "10.1016/j.apcatb.2003.09.018",

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T1 - NOx reduction from diesel emissions over a non-transition metal zeolite catalyst

T2 - Effect of water in the feed

AU - Wen, Bin

AU - Yeom, Young Hoon

AU - Weitz, Eric

AU - Sachtler, Wolfgang M.H.

N1 - Funding Information: This work was supported by the EMSI program of the National Science Foundation and the US Department of Energy Office of Science (CHE-9810378) at the Northwestern University Institute for Environmental Catalysis. Financial aid from the Director of the Chemistry Division, Basic Energy Sciences, US Department of Energy, grant DE-FGO2-87ER13654, is gratefully acknowledged.

PY - 2004/3/18

Y1 - 2004/3/18

N2 - NO reduction activity with acetaldehyde over BaY is low in a dry feed, but significantly higher in the presence of water vapor. Aldol condensation of acetaldehyde takes place, polymerization of the resulting crotonaldehyde deactivates the catalyst. Water vapor prevents the formation of large amounts of carbonaceous deposits, either by suppressing the dehydration of aldol to crotonadehyde or by interacting with carbonaceous deposits or their precursors, transforming them to CO, CO2 and H2. Temperature- programmed oxidation (TPO) shows much lower coke formation after tests in the presence of water vapor. TPD-MS data show that nitromethane, a possible intermediate in the NOx reduction process, reacts with water on BaY forming NH3, COx and isocyanic acid HNCO. NOx conversion over BaY reaches values near 90% at 200°C and a GHSV of 30,000h-1 if the NOx initially contains both NO and NO2. No transition metal is involved in the reduction of NO x to NH3 and N2 over BaY.

AB - NO reduction activity with acetaldehyde over BaY is low in a dry feed, but significantly higher in the presence of water vapor. Aldol condensation of acetaldehyde takes place, polymerization of the resulting crotonaldehyde deactivates the catalyst. Water vapor prevents the formation of large amounts of carbonaceous deposits, either by suppressing the dehydration of aldol to crotonadehyde or by interacting with carbonaceous deposits or their precursors, transforming them to CO, CO2 and H2. Temperature- programmed oxidation (TPO) shows much lower coke formation after tests in the presence of water vapor. TPD-MS data show that nitromethane, a possible intermediate in the NOx reduction process, reacts with water on BaY forming NH3, COx and isocyanic acid HNCO. NOx conversion over BaY reaches values near 90% at 200°C and a GHSV of 30,000h-1 if the NOx initially contains both NO and NO2. No transition metal is involved in the reduction of NO x to NH3 and N2 over BaY.

KW - Aldol condensation over BaY

KW - BaY catalyst

KW - Diesel emission

KW - NO reduction with acetaldehyde

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