Comparison between methane and propylene as reducing agents in the SCR of NO over Pd supported on tungstated zirconia

被引：30

作者：

Chin, YH ^{[1
]}

Alvarez, WE ^{[1
]}

Resasco, DE ^{[1
]}

机构：

[1] Univ Oklahoma, Sch Chem Engn & Mat Sci, Norman, OK 73019 USA

来源：

CATALYSIS TODAY | 2000年 / 62卷 / 04期

基金：

美国国家科学基金会;

关键词：

reducing agents; sulfated zirconias; tungstated zirconias;

D O I：

10.1016/S0920-5861(00)00431-4

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

It is now well known that when Pd is supported on acidic supports, it becomes highly selective for the reduction of NO by methane in the presence of excess oxygen. It is also known that this promoting effect not only occurs with acidic zeolite supports, but also with acidic zirconia supports, such as sulfated zirconia (SZ) and tungstated zirconias (WZ). However, this promoting effect has not been investigated for the SCR with other hydrocarbons as reducing agents. In this contribution, we have investigated the behavior of a series of Pd/WZ catalysts and compared them using methane and propylene as reducing agents. The results show some important differences when the reducing agent is changed. For example, while with CH4 the addition of W to the catalyst results in an increase in both NO and hydrocarbon conversion, with C3H6 it results in a decrease in activity. At the same time, while the presence of NO accelerates the activation of CH4, it inhibits the activation of C3H6, moving its light-off to higher temperatures. Finally, an important difference between CH4 and C3H6 as reducing agents is regarding the selectivity towards N-2 as opposed to N2O. Using CH4 resulted in much lower production of N2O than using C3H6, over the entire temperature range investigated. (C) 2000 Published by Elsevier Science B.V.

引用

页码：291 / 302

页数：12

共 27 条

[1] The effect of zeolitic protons on NOx reduction over Pd/ZSM-5 catalysts
Adelman, BJ
Sachtler, WMH
[J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 1997, 14 (1-2) : 1 - 11
[2] Redispersion of Pd on acidic supports and loss of methane combustion activity during the selective reduction of NO by CH4
Ali, A
Chin, YH
Resasco, DE
[J]. CATALYSIS LETTERS, 1998, 56 (2-3) : 111 - 117
[3] State of Pd on H-ZSM-5 and other acidic supports during the selective reduction of NO by CH4 studied by EXAFS/XANES
Ali, A
Alvarez, W
Loughran, CJ
Resasco, DE
[J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 1997, 14 (1-2) : 13 - 22
[4] Characterization of highly active silver catalyst for NOx reduction in lean-burning engine exhaust
Aoyama, N
Yoshida, K
Abe, A
Miyadera, T
[J]. CATALYSIS LETTERS, 1997, 43 (3-4) : 249 - 253
[5] Investigations of the dispersion of Pd in H-ZSM-5
Aylor, AW
Lobree, LJ
Reimer, JA
Bell, AT
[J]. JOURNAL OF CATALYSIS, 1997, 172 (02) : 453 - 462
[6] Structure and electronic properties of solid acids based on tungsten oxide nanostructures
Barton, DG
Shtein, M
Wilson, RD
Soled, SL
Iglesia, E
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (04): : 630 - 640
[7] The difference between alkanes and alkenes in the reduction of NO by hydrocarbons over Pt catalysts under lean-burn conditions
Burch, R
Watling, TC
[J]. CATALYSIS LETTERS, 1997, 43 (1-2) : 19 - 23
[8] BURCH R, 1994, CATAL TODAY, V22, P1
[9] NO reduction by CH4 in the presence of excess O2 over Pd/sulfated zirconia catalysts
Chin, YH
Pisanu, A
Serventi, L
Alvarez, WE
Resasco, DE
[J]. CATALYSIS TODAY, 1999, 54 (04) : 419 - 429
[10] CHIN YH, UNPUB CATAL TODAY

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