文献类型：期刊文献

英文题名：Metal-foam-structured Ni-Al2O3 catalysts: Wet chemical etching preparation and syngas methanation performance

作者：Li, Yakun[1];Zhang, Qiaofei[1];Chai, Ruijuan[1];Zhao, Guofeng[1];Cao, Fahai[2];Liu, Ye[1];Lu, Yong[1]

机构：[1]E China Normal Univ, Sch Chem & Mol Engn, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China;[2]E China Univ Sci & Technol, Coll Chem Engn, Shanghai 200237, Peoples R China

年份：2016

卷号：510

起止页码：216

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;EI(收录号：20154901635199);WOS:【SCI-EXPANDED(收录号:WOS:000369214300023)】；

基金：This work was financially supported by the "973 program" (2011CB201403) from the MOST of China, and the NSF of China (21473057, 21273075, U1462129, 21076083).

语种：英文

外文关键词：Structured catalyst; Syngas methanation; Foam; Enhanced heat transfer; CFD simulation

摘要：Production of substitute natural gas (SNG) by methanation of syngas generated from various carbon sources provides a promising route towards coal clean utilization and sustainable energy future. Monolithic Ni (or Cu, NiCu-alloy)-foam-structured Ni-Al2O3 catalysts were developed by a facile modified wet chemical etching method. The as-prepared catalysts were characterized by X-ray diffraction, scanning electron microscopy, inductively coupled plasma atomic emission spectrometry and H-2-temperature programmed reduction. Among these catalysts, Ni-Al2O3/Ni-foam has the most surface active Ni atoms and exhibits the best catalytic methanation performance, achieving 99.9% CO conversion with 90.0% methane selectivity and being stable for at least 1000 h for a feed gas of H-2/CO (3/1) at 330 degrees C and gas hourly space velocity (GHSV) of 5000 h(-1). Effects of reaction temperature, reaction pressure and GHSV are also investigated on the catalytic performance of Ni-Al2O3/Ni-foam for CO methanation. Computational fluid dynamics calculation and experimental measurement consistently show that such monolithic Ni-Al2O3/Ni-foam can dramatically reduce the "hotspot" temperature due to its high thermal conductivity. Moreover, the feasibility of our Ni-Al2O3/Ni-foam catalyst for co-methanation of a simulated feed gas from coal gasification is studied as well as CO2 methanation in the presence of high CH4 concentration. We anticipate that our present work might stimulate commercial exploitation of the new-generation structured catalyst and reactor technology for the strongly exothermic syngas methanation toward energy-efficient process for SNG production. (C) 2015 Elsevier B.V. All rights reserved.