In situ FT-IR study of Rh-Al-MCM-41 catalyst for the selective catalytic reduction of nitric oxide with propylene in the presence of excess oxygen

被引：41

作者：

Long, RQ ^{[1
]}

Yang, RT ^{[1
]}

机构：

[1] Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 12期

关键词：

D O I：

10.1021/jp984525d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Rh-exchanged Al-MCM-41 is studied for selective catalytic reduction (SCR) of NO by C3H6 in the presence of excess oxygen. It shows a high activity in converting NO to N-2 and N2O at low temperatures. In situ FT-IR studies indicate that Rh-NO+ species (1910-1898 cm(-1)) is formed on the Rh-A1-MCM-41 catalyst in flowing NO/He, NO + O-2/He and NO + C3H6 + O-2/He at 100-350 degrees C. This species is quite active in reacting with propylene and/or propylene adspecies (e.g., pi-C3H5, polyene, etc.) at 250 degrees C in the presence/absence of oxygen, leading to the formation of the isocyanate species (Rh-NCO, at 2174 cm(-1)), CO, and CO2. Rh-NCO is also detected under reaction conditions. A possible reaction pathway for reduction of NO by C3H6 is proposed. In the SCR reaction, Rh-NO+ and propylene adspecies react to generate the Rh-NCO species, then Rh-NCO reacts with O-2, NO, and NO2 to produce N-2, N2O, and CO2. Rh-NO+ and Rh-NCO species are two main intermediates for the SCR reaction on Rh-Al-MCM-41 catalyst.

引用

页码：2232 / 2238

页数：7

共 32 条

[1] Selective catalytic reduction of nitric oxide by hydrocarbons
Amiridis, MD
Zhang, TJ
Farrauto, RJ
[J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 1996, 10 (1-3) : 203 - 227
[2] INFRARED STUDY OF NITRIC-OXIDE ADSORBED ON RHODIUM-ALUMINA CATALYST
ARAI, H
TOMINAGA, H
[J]. JOURNAL OF CATALYSIS, 1976, 43 (1-3) : 131 - 142
[3] NO adsorption, desorption, and reduction by CH4 over Mn-ZSM-5
Aylor, AW
Lobree, LJ
Reimer, JA
Bell, AT
[J]. JOURNAL OF CATALYSIS, 1997, 170 (02) : 390 - 401
[4] AN FTIR STUDY OF THE SPECIES ADSORBED ON A RH/AL2O3 CATALYST IN THE SELECTIVE REDUCTION OF NO BY PROPYLENE
BAMWENDA, GR
OBUCHI, A
OGATA, A
MIZUNO, K
[J]. CHEMISTRY LETTERS, 1994, (11) : 2109 - 2112
[5] SELECTIVE REDUCTION OF NITRIC-OXIDE WITH PROPENE OVER PLATINUM-GROUP BASED CATALYSTS - STUDIES OF SURFACE SPECIES AND CATALYTIC ACTIVITY
BAMWENDA, GR
OGATA, A
OBUCHI, A
OI, J
MIZUNO, K
SKRZYPEK, J
[J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 1995, 6 (04) : 311 - 323
[6] Synthesis and characterization of mesostructured materials
Biz, S
Occelli, ML
[J]. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 1998, 40 (03): : 329 - 407
[7] SYNTHESIS OF ALUMINUM-RICH MCM-41
BORADE, RB
CLEARFIELD, A
[J]. CATALYSIS LETTERS, 1995, 31 (2-3) : 267 - 272
[8] Mechanistic considerations for the reduction of NOx over Pt/Al2O3 and Al2O3 catalysts under lean-burn conditions
Burch, R
Sullivan, JA
Watling, TC
[J]. CATALYSIS TODAY, 1998, 42 (1-2) : 13 - 23
[9] MECHANISM OF THE SELECTIVE REDUCTION OF NITROGEN MONOXIDE ON PLATINUM-BASED CATALYSTS IN THE PRESENCE OF EXCESS OXYGEN
BURCH, R
MILLINGTON, PJ
WALKER, AP
[J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 1994, 4 (01) : 65 - 94
[10] PROPYLENE AND OXYGEN CHEMISORPTION ON CUPRIC OXIDE AND CUPROUS OXIDE CATALYSTS
GEREI, SV
ROZHKOVA, EV
GOROKHOV.YB
[J]. JOURNAL OF CATALYSIS, 1973, 28 (03) : 341 - 350

← 1 2 3 4 →