Cr-MnOx mixed-oxide catalysts for selective catalytic reduction of NOx with NH3 at low temperature

被引：355

作者：

Chen, Zhihang ^{[1
]}

Yang, Qing ^{[1
]}

Li, Hua ^{[1
]}

Li, Xuehui ^{[1
]}

Wang, Lefu ^{[1
]}

Tsang, Shik Chi ^{[2
]}

机构：

[1] S China Univ Technol, Guangdong Prov Lab Green Chem Technol, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China

[2] Univ Oxford, Inorgan Chem Lab, Wolfson Catalysis Ctr, Oxford OX1 3QR, England

来源：

JOURNAL OF CATALYSIS | 2010年 / 276卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Cr-Mn mixed oxide; Low temperature; Selective catalytic reduction; Nitrogen oxides; crmn(1) w(5)O(4); NITRIC-OXIDE; OXIDATIVE DEHYDROGENATION; MANGANESE; AMMONIA; SO2; DECOMPOSITION; COMBUSTION; MECHANISM; OXYGEN; ZRO2;

D O I：

10.1016/j.jcat.2010.08.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

Cr-Mn mixed-oxide based catalysts were prepared for the low-temperature selective catalytic reduction of NOx with ammonia in the presence of excess oxygen it was found that the Cr(0 4)-MnOx showed the highest activity and yielded 98 5% NOx conversion at 120 degrees C XRD TPR and Raman data results suggested that a crystalline phase of CrMn1 O-5(4) was present in the Cr-MnOx catalysts which contained the active species XPS results of fresh used and regenerated Cr(0 4)-MnOx catalysts illustrated clearly the presence of Mn2+ Mn3+ Mn4+ and Cr2+ Cr3+ Cr5+ oxidation states Efficient electron transfer between Cr and Mn in the crystal of CrMn1 O-5(4) was thought to be the reason for the high activity and long lifetime of the Cr(0 4)-MnOx catalyst In addition the SCR activity was gradually suppressed in the presence of SO2 while such an effect was shown to be reversible after switching off the SO2 injection (C) 2010 Elsevier Inc All rights reserved

引用

页码：56 / 65

页数：10

共 51 条

[1]

Structure and optical properties of pulsed sputter deposited CrxOy/Cr/Cr2O3 solar selective coatings [J].