Production of syngas via CO2 methane reforming process: Effect of cerium and calcium promoters on the performance of Ni-MSC catalysts

被引：26
|
作者：
Sun, Yinghui [1 ]
Zhang, Guojie [1 ,2 ]
Liu, Jiwei [1 ]
Xu, Ying [1 ]
Lv, Yongkang [1 ]
机构：
[1] Taiyuan Univ Technol, Key Lab Coal Sci & Technol, Minist Educ & Shanxi Prov, Taiyuan 030024, Peoples R China
[2] State Key Lab Coal & Coalbed Methane Coextract, Jincheng 048012, Shanxi, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2020年 / 45卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Dry reforming of methane; Ni; Promoter; Calcium; Cerium; Mesoporous silica-carbon; ALKALINE-EARTH PROMOTERS; CARBON-DIOXIDE; MESOPOROUS MATERIALS; NI/SBA-15; CATALYSTS; HYDROGEN-PRODUCTION; DRY; SUPPORT; SILICA; NICKEL; MG;
D O I：
10.1016/j.ijhydene.2019.10.228
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：
The dry reforming of methane (DRM) over Ni-MSC catalysts promoted by different Ce/Ca ratios was compared. The different Ce/Ca ratios proportions were introduced by coprecipitation. The catalysts with different content of promoter were characterized by N-2 adsorption, XRD, H-2-TPR and TEM. XRD and TEM results demonstrated that Ni-4Ce1Ca-MSC catalyst modified with high Ce/Ca had the best dispersibility and the smallest Ni particle size, resulting in more surface active sites. The synergy between Ce and Ca made a great contribution to prohibiting the generation of carbon deposits and the sintering of active metal during DRM procession. In contrast, catalysts modified only with Ca or Ce exhibited poor catalytic performance, resulting in significant deposition of carbon on the surface of the Ni-5Ca-MSC catalyst. In addition, the high Ce concentration greatly increases the oxygen storage capacity, which helps to form oxygen vacancies by mutual conversion of Ce4+/Ce3+ and Ni2+/Ni-0. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：640 / 649
页数：10
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