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Role of Sn in Ni‐Sn/ CeO 2 Catalysts for Ethanol Steam Reforming
Author(s) -
Tian Hao,
Li Xinyu,
Chen Sai,
Zeng Liang,
Gong Jinlong
Publication year - 2017
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201600569
Subject(s) - chemistry , steam reforming , catalysis , bimetallic strip , chemical engineering , space velocity , hydrogen , ethanol , hydrogen production , oxygen , syngas , selectivity , nuclear chemistry , organic chemistry , engineering
Reducible oxides ( e.g ., CeO 2 and ZrO 2 ) supported 3d transition metals ( e.g ., Ni, Co, Pt) exhibit remarkable catalytic activity in reactions that involve water activation, such as steam reforming and water gas shift. This paper describes the influence of Sn addition on the performance of Ni/ CeO 2 catalysts in ethanol steam reforming. 0.25 wt% Sn addition improved the stability of Ni/ CeO 2 by forming Ni‐Sn bimetallic nanoparticles with Sn enriched surfaces to suppress the carbon deposition. Ni 0. 25 Sn / CeO 2 kept over 90% ethanol conversion in a 20 h stability test at 600 °C with over 60% hydrogen selectivity under a gas hourly space velocity of 57000 mL /(g•h). However, the presence of Sn decreased the overall oxygen storage capacity and oxygen mobility of NiSn / CeO 2 , which hampered water activation process and coke elimination occurring at the interface between Ni and CeO 2 . Additionally, ethanol decomposition was also suppressed due to the coverage of Sn atoms on Ni surfaces.