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Highly Selective and Stable NiSn/SiO 2 Catalyst for Isobutane Dehydrogenation: Effects of Sn Addition
Author(s) -
Wang Guowei,
Wang Haoren,
Zhang Huanling,
Zhu Qingqing,
Li Chunyi,
Shan Honghong
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201600685
Subject(s) - dehydrogenation , hydrogenolysis , isobutane , catalysis , coke , selectivity , chemical engineering , electronic effect , chemistry , bimetallic strip , particle size , desorption , materials science , photochemistry , inorganic chemistry , metallurgy , adsorption , organic chemistry , engineering
Ni/SiO 2 catalysts with large surface area Ni particles exhibit high hydrogenolysis activity, leading to the formation of large amounts of methane and coke. To destroy the active sites for hydrogenolysis, namely the aggregated Ni ensembles, Sn species were introduced into the Ni/SiO 2 catalyst. As expected, isobutene selectivity was significantly increased to 90.2 %. The promoting role of Sn on the dehydrogenation performance could be interpreted as both a geometric and electronic effect. On one hand, Sn addition efficiently dispersed aggregated Ni particles and reduced Ni particle size from 77 to 16 nm, weakening the ability of Ni for C−C bond rupture. On the other hand, additional electrons provided by Sn led to a high electronic density of Ni, facilitating the desorption of isobutene from the catalyst and suppressing secondary reactions. Consequently, coke formation was effectively inhibited over the NiSn/SiO 2 catalyst, further guaranteeing a good stability and prolonged cycle time.