Bimetallic Cr-In/H-SSZ-13 for selective catalytic reduction of nitric oxide by methane

被引：14
|
作者：
Yang, Jun [1 ,2 ]
Chang, Yupeng [1 ,2 ]
Dai, Weili [1 ,2 ]
Wu, Guangjun [1 ,2 ]
Guan, Naijia [1 ,2 ,3 ]
Li, Landong [1 ,2 ,3 ]
机构：
[1] Nankai Univ, Sch Mat Sci & Engn, Tianjin 300071, Peoples R China
[2] Nankai Univ, Natl Inst Adv Mat, Tianjin 300071, Peoples R China
[3] Nankai Univ, Collaborat Innovat Ctr Chem Sci & Engn, Minist Educ, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
来源：
CHINESE JOURNAL OF CATALYSIS | 2018年 / 39卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Selective catalytic reduction; Nitric oxide; Methane; Cr-In/H-SSZ-13; Bimetallic catalyst; NITROGEN-OXIDES; EXCESS OXYGEN; NOX REDUCTION; ACTIVE-SITES; SCR; ZEOLITE; INDIUM; PERFORMANCE; CH4; MECHANISM;
D O I：
10.1016/S1872-2067(18)63054-2
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Bimetallic Cr-In/H-SSZ-13 zeolites were prepared by wet impregnation and investigated for selective catalytic reduction of nitric oxide by methane (CH4-SCR). Reduction-oxidation treatments led to close contact and interaction between Cr and In species in these zeolites, as revealed by transmission electron microscopy and X-ray photoelectron spectroscopy. Compared to monometallic Cr/H-SSZ-13 and In/H-SSZ-13, the bimetallic catalyst system exhibited dramatically enhanced CH4-SCR performance, i.e., NO conversion greater than 90% and N-2 selectivity greater than 99% at 550 degrees C in the presence of 6% H2O under a high gas hourly space velocity of 75 000 /h. The bimetallic Cr-In/H-SSZ-13 showed very good stability in CH4-SCR with no significant activity loss for over 160 h. Catalytic data revealed that CH4 and NO were activated on the In and Cr sites of Cr-In/H-SSZ-13, respectively, both in the presence of O-2 during CH4-SCR. (C) 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：1004 / 1011
页数：8
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