Infrared Evidence of a Formate-Intermediate Mechanism over Ca-Modified Supports in Low-Temperature Ethanol Steam Reforming

被引：31
作者：
Choong, Catherine [1 ,2 ]
Zhong, Ziyi [1 ]
Huang, Lin [1 ]
Borgna, Armando [1 ]
Hong, Liang [2 ]
Chen, Luwei [1 ]
Lin, Jianyi [1 ]
机构：
[1] ASTAR, Inst Chem & Engn Sci, Singapore 627833, Singapore
[2] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 119260, Singapore
来源：
ACS CATALYSIS | 2014年 / 4卷 / 07期
关键词：
ethanol steam reforming; reaction pathway; acetate; formate; Pt; Rh; Pd; Ca; Al2O3; NOBLE-METAL CATALYSTS; GAS SHIFT REACTION; SITU FT-IR; PROGRAMMED DESORPTION; HYDROGEN-PRODUCTION; SURFACE-REACTIONS; CALCIUM ADDITION; ALUMINUM-OXIDE; RH CATALYSTS; ADSORPTION;
D O I：
10.1021/cs500358n
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：
An in situ DRIFTS study of ethanol adsorption and desorption was performed on Pt (Rh, Pd) supported on Al2O3 and Ca-Al2O3. Different from the well-known acetate-intermediate reaction mechanism observed on Al2O3-supported metal catalysts, formate species are exclusively observed on Pt (Rh, Pd) supported on Ca-Al2O3, offering a new mechanism denoted as the formate-intermediate mechanism. The key factor in determining the change in mechanism is the reduced availability of surface oxygen and the enhanced C-C breaking ability of the metal catalyst upon Ca modification. The formate-intermediate mechanism is favored in the presence of noble metals in the following order: Pt > Rh > Pd.
引用
收藏
页码：2359 / 2363
页数：5
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