DOI: 10.1016/j.jcou.2017.07.014
Scopus记录号: 2-s2.0-85025808851
论文题名: CO2 methanation over Ca doped ordered mesoporous Ni-Al composite oxide catalysts: The promoting effect of basic modifier
作者: Xu L. ; Yang H. ; Chen M. ; Wang F. ; Nie D. ; Qi L. ; Lian X. ; Chen H. ; Wu M.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 21 起始页码: 200
结束页码: 210
语种: 英语
英文关键词: Ca modification
; CO2 activation
; CO2 methanation
; Low-temperature activity
; Ni catalyst
Scopus关键词: Activation energy
; Alkalinity
; Aluminum alloys
; Binary alloys
; Calcium
; Calcium alloys
; Carbon dioxide
; Catalyst activity
; Catalysts
; Chemical activation
; Hydrogenation
; Methanation
; Nickel
; Nickel alloys
; Pore size
; Sintering
; Temperature
; Apparent activation energy
; Evaporation induced self assemblies
; Large specific surface areas
; Low-temperature activity
; Narrow pore size distributions
; Ni catalysts
; Ordered mesoporous materials
; Substitute natural gas
; Mesoporous materials
英文摘要: Ni is usually used as the catalyst for the CO2 methanation to generate the substitute natural gas (SNG) due to the low cost. However, it often possesses relatively worse low-temperature catalytic activity than the noble metal counterparts. In order to solve this problem, a series of Ca doped Ni based ordered mesoporous materials had been facilely fabricated via the one-pot evaporation induced self-assembly (EISA) strategy and directly used as the catalysts for CO2 methanation. These materials had been systematically characterized by XRD, N2 adsorption-desorption, TEM, SAED, EDS, XPS, H2-TPR, and CO2-TPD measurements. It was discovered that the large specific surface areas (210.7-240.7 m2/g), big pore volumes (0.37-0.46 cm3/g), and narrow pore size distributions (8.3-9.5 nm) of these materials had been successfully retained after 700 °C calcination. In these materials, Ni species were homogenously dispersed among the Al2O3 matrix via the one-pot fabrication strategy and the strong interaction between Ni and mesoporous framework had been formed. Thus, the seriously thermal sintering of the metallic Ni nanoparticles could be successfully inhibited. Hence, they displayed no deactivation after 50 h stability test toward CO2 methanation. More importantly, the doping of the Ca greatly enhanced the surface basicity, which could favor the chemisorption and activation of CO2. As a result, the apparent activation energies of CO2 could be remarkably decreased from 75.2 to 53.6 kJ/mol and the low-temperature catalytic activity had been significantly promoted. Therefore, these Ca doped Ni based ordered mesoporous materials promised potential catalysts for CO2 methanation. © 2017 Elsevier Ltd. All rights reserved. 资助项目: National Natural Science Foundation of China
; National Natural Science Foundation of China
; National Natural Science Foundation of China
; National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52658
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Xu L.,Yang H.,Chen M.,et al. CO2 methanation over Ca doped ordered mesoporous Ni-Al composite oxide catalysts: The promoting effect of basic modifier[J]. Journal of CO2 Utilization,2017-01-01,21