Sn promoted BaFeO3-δ catalysts for N2O decomposition: Optimization of CrossMark Fe active centers

被引：55
作者：
Huang, Chuande [1 ,2 ]
Zhu, Yanyan [3 ]
Wang, Xiaodong [1 ]
Liu, Xin [1 ]
Wang, Junhu [1 ]
Zhang, Tao [1 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Northwest Univ Xian, Coll Chem Engn, Xian 710069, Peoples R China
来源：
JOURNAL OF CATALYSIS | 2017年 / 347卷
基金：
美国国家科学基金会;
关键词：
Perovskite; B-site substitution; Oxygen mobility; MOssbauer spectroscopy; N2O decomposition; HIGH-TEMPERATURE; PEROVSKITE OXIDES; OXYGEN MOBILITY; X-RAY; SOLID-SOLUTIONS; NITROUS-OXIDE; PERFORMANCE; IRON; NO; COMBUSTION;
D O I：
10.1016/j.jcat.2016.12.020
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：
A series of BaFe1-xSnxO3-delta catalysts were prepared by sol-gel method and tested for N2O decomposition to shed light on the effect of B-site substitution on the catalytic behavior of perovskite catalysts. Sn-119 and Fe-57 Mossbauer results confirmed that the 5-fold coordinated Fe3+ cations with one adjacent oxygen vacancy (Fe3+-O-5) were the main active centers for N2O decomposition. Doping of Sn cations can significantly improve the percentage of Fe3+-O-5 from 30% (x = 0) to 68% (x = 0.8). More importantly, the valence state of Fe could be gradually reduced due to weakening of Fe-O bond with increasing the Sn content, which was attributed to the stronger force of Sn than Fe in Fe-O Sn structure to draw the oxygen anion and expansion of unit cell volume. Such change of Fe chemical state favored the oxygen mobility of the catalyst, leading to reduction in activation energy for N2O decomposition from ca. 241 (x = 0) to 178 kJ moL(-1) (x = 0.8). BaFe0.2Sn0.8O3-delta,5 catalyst exhibited the highest intrinsic rate of 1.49 s(-1) (550 degrees C), nearly 4 times larger than that of BaFeO3-delta (0.43 s(-1)). (C) 2017 Elsevier Inc. All rights reserved.
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页码：9 / 20
页数：12
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