Effect of surface properties controlled by Ce addition on CO2 methanation over Ni/Ce/Al2O3 catalyst

被引：87
作者：
Kim, Min-Jae [1 ,3 ]
Youn, Jae-Rang [2 ,3 ]
Kim, Hye Jeong [2 ]
Seo, Myung Won [3 ]
Lee, Doyeon [3 ]
Go, Kang Seok [3 ]
Lee, Ki Bong [1 ]
Jeon, Sang Goo [3 ]
机构：
[1] Korea Univ, Dept Chem & Biol Engn, Anam Ro 145, Seoul 02841, South Korea
[2] Chungnam Natl Univ, Grad Sch Energy Sci & Technol, 99 Daehak Ro, Daejeon 305764, South Korea
[3] Korea Inst Energy Res, 152 Gajeong Ro, Daejeon 34129, South Korea
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2020年 / 45卷 / 46期
关键词：
CO2; methanation; Nickel; Cerium; adsorption; Defect oxygen; CARBON-DIOXIDE; NI/CEO2-ZRO2; CATALYSTS; NI/AL2O3; NI; GAS; NICKEL; STEAM; FUNDAMENTALS; NI-CE/AL2O3; INSIGHT;
D O I：
10.1016/j.ijhydene.2020.06.144
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：
Ce-promoted Ni/Al2O3 catalysts with Ce contents of 0, 5, 10, 15, and 20 wt% were investigated for CO2 methanation. Ni/15Ce/Al2O3 showed good selectivity and catalytic performance in CO2 methanation and remained stable at 350 degrees C for 80 h with minor fluctuations. Interactions between Ni and the Ce/Al2O3 support was characterized using X-ray diffraction, temperature-programmed reduction of H-2, temperature-programmed desorption of CO2, X-ray photoelectron spectroscopy, Raman spectroscopy, and thermogravimetric analysis. Addition of Ce did not increase the catalytic surface area, which can significantly enhance the heterogeneous catalytic activity. However, XPS analysis showed that the Ce on the Ni/Al2O3 catalyst changed the surface electron states of Ni, Ce, and O. Additionally, CO2 adsorption/desorption was confirmed to be related to the amount of Ce present on Ni/ Al2O3 by TGA and CO2-TPD. The Ce addition thus played an important role in determining the CO2 adsorption, desorption, and conversion. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：24595 / 24603
页数：9
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