Water-Gas Shift on Pd/α-MnO2 and Pt/α-MnO2

被引：21
作者：
Shan, Jun-jun [1 ,2 ]
Luan Nguyen [1 ,2 ]
Zhang, Shiran [1 ,2 ]
Tao, Franklin-Feng [1 ,2 ]
机构：
[1] Univ Kansas, Dept Chem & Petr Engn, Lawrence, KS 66045 USA
[2] Univ Kansas, Dept Chem, Lawrence, KS 66045 USA
来源：
CATALYSIS LETTERS | 2015年 / 145卷 / 08期
基金：
美国国家科学基金会;
关键词：
Heterogeneous catalysis; Nanoparticles; TEM; Spectroscopy and General Characterisation; IN-SITU; CATALYTIC PERFORMANCE; SURFACE-CHEMISTRY; OXIDE CATALYSTS; CERIA; OXIDATION; REDUCTION; XPS; PD; ALPHA-MNO2;
D O I：
10.1007/s10562-015-1549-9
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：
Low temperature water-gas shift (WGS) catalysts, Pd nanoparticles supported on alpha-MnO2 nanorods termed Pd/alpha-MnO2 and Pt nanoparticles supported on alpha-MnO2 nanorods termed Pt/alpha-MnO2 were synthesized by introducing Pd or Pt precursor to well-prepared alpha-MnO2 nanorods through precipitation deposition with a following annealing at 300 A degrees C. They are quite active for WGS in the temperature range of 140-350 A degrees C. Activation energies for WGS on Pd/alpha-MnO2 and Pt/alpha-MnO2 are 45.3 and 56.4 kJ/mol respectively, comparable to precious metal supported on CeO2 and TiO2 for WGS. Surface chemistries of the two catalysts during WGS were tracked with ambient pressure X-ray photoelectron spectroscopy. Different from the preservation of the surface and bulk phase of other oxide support such as CeO2, TiO2 in CeO2- or TiO2-based WGS catalysts, both surface and bulk of alpha-MnO2 nanorods of Pd/alpha-MnO2 and Pt/alpha-MnO2 are transited to MnO during WGS. In-situ studies identified oxygen vacancies of the formed MnO support during WGS and the metallic state of Pd and Pt nanoparticles supported on the nonstoichiometric MnO.
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页码：1571 / 1580
页数：10
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