Enhanced activity of CO2 methanation over Ni/CeO2-ZrO2 catalysts: Influence of preparation methods

甲烷化 催化作用 甲烷 材料科学 化学 选择性 格式化 氧气 无机化学 有机化学 冶金 生物化学
作者
J. Ashok,Ming Li Ang,Sibudjing Kawi
出处
期刊:Catalysis Today [Elsevier BV]
卷期号:281: 304-311 被引量:293
标识
DOI:10.1016/j.cattod.2016.07.020
摘要

A series of nickel catalysts supported on CexZr1-xO2(CZ) were prepared by ammonia evaporation (AE), impregnation (IMP) and deposition–precipitation (DP) methods. Their performances for CO2 hydrogenation to methane were investigated at reaction temperatures between 200 and 350 °C. Among the catalysts tested, the Ni/CZ (Ni/CZ-AE) catalyst prepared via AE method gave superior catalytic performance at comparatively lower reaction temperatures. At 275 °C, it can attain a maximum CO2 conversion and methane selectivity of 55% and 99.8%, respectively and it is stable for nearly 70 h reaction time. The better catalytic performance of Ni/CZ-AE is due to the ability of the catalyst to be activated at low temperatures. XPS results for Ni/CZ-AE catalyst shows that some of Ni species are well incorporated into CeO2 lattice of CZ support, resulting in the imbalance of electric charge and lattice distortion of CeO2. Thus, oxygen vacancies can be generated, allowing for adsorption of oxygen species on these vacancies. This finding correlates well with the H2-TPR and CO-TPR results, which demonstrated the shifting of the reduction temperature towards lower temperature ranges than bare CZ support with the incorporation of Ni in Ni/CZ-AE catalyst. DRIFTS experiments for CO2 hydrogenation reaction revealed that the methane formation is via CO free mechanism i.e, formation of carbonates and formate species which are further hydrogenated and decomposed directly to release methane.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
周志轩66发布了新的文献求助10
刚刚
宛海发布了新的文献求助10
刚刚
刚刚
if发布了新的文献求助10
1秒前
偲偲偲偲偲完成签到,获得积分10
1秒前
JamesPei应助李雪蒙采纳,获得10
2秒前
2秒前
李健应助WEI采纳,获得10
2秒前
完美世界应助活泼的南风采纳,获得10
2秒前
iu完成签到,获得积分10
3秒前
wy发布了新的文献求助10
3秒前
3秒前
yznfly应助Rosaline采纳,获得30
4秒前
Jasper应助hanzhangjian采纳,获得10
4秒前
my发布了新的文献求助10
4秒前
5秒前
传奇3应助xdc采纳,获得10
5秒前
丁大完成签到,获得积分10
5秒前
Owen应助meimale采纳,获得10
5秒前
5秒前
gyd发布了新的文献求助10
5秒前
邸泽阳完成签到 ,获得积分10
5秒前
6秒前
7秒前
7秒前
LYSM完成签到,获得积分0
7秒前
xxx发布了新的文献求助10
8秒前
义气鲂完成签到,获得积分20
8秒前
JamesPei应助公冶嘉懿采纳,获得10
8秒前
Ryan发布了新的文献求助10
10秒前
10秒前
天天快乐应助宛海采纳,获得10
10秒前
11秒前
12秒前
李佳轩发布了新的文献求助10
12秒前
gyd完成签到,获得积分10
12秒前
okl完成签到,获得积分10
13秒前
杠赛来完成签到,获得积分10
13秒前
zxh完成签到,获得积分10
14秒前
达到发布了新的文献求助10
14秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3969335
求助须知:如何正确求助?哪些是违规求助? 3514162
关于积分的说明 11172430
捐赠科研通 3249456
什么是DOI,文献DOI怎么找? 1794853
邀请新用户注册赠送积分活动 875437
科研通“疑难数据库(出版商)”最低求助积分说明 804809