Promoting effect of Rh on the activity and stability of Pt-based methane combustion catalyst in microreactors

被引：11
|
作者：
Neuberg, Stefan [1 ]
Pennemann, Helmut [1 ]
Shanmugam, Vetrivel [1 ]
Zapf, Ralf [1 ]
Kolb, Gunther [1 ]
机构：
[1] Fraunhofer Inst Microengn & Microsyst, Carl Zeiss Str 18-20, D-55129 Mainz, Germany
来源：
CATALYSIS COMMUNICATIONS | 2021年 / 149卷
关键词：
Methane; Combustion; Platinum; Rhodium; Bimetallic; Catalytic stability; SYNGAS PRODUCTION; OXIDATION; BIOGAS; STEAM; PD; ACTIVATION; PD/AL2O3; STATE;
D O I：
10.1016/j.catcom.2020.106202
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：
For the combustion of methane, a partial replacement of platinum by rhodium leads to a significantly improved light-off behavior of the corresponding mixed Pt-Rh/gamma-Al2O3 catalysts compared to a catalyst containing only Pt supported on gamma-Al2O3. For all Pt-Rh/gamma-Al2O3 catalysts, mixed Pt-Rh crystals of low particle size were found. At 600 degrees C, the stability of catalysts, was found to increase with increasing rhodium content. The crystal size was determined by HR-TEM for spent catalyst samples after 40 h stability test. The samples containing higher amounts of rhodium showed smaller crystal size suggesting this as the origin of the increased catalyst stability.
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页数：5
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