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Glow Discharge Plasma-Assisted Preparation of Nickel-Based Catalyst for Carbon Dioxide Reforming of Methane
Fang Guo a,Wei Chu a*,Jun-qiang Xu b,Lin Zhong a
Author NameAffiliationE-mail
Fang Guo a Department of Chemical Engineering, Sichuan University, Chengdu 610065, China chuwei65@yahoo.com.cn 
Wei Chu a* Department of Chemical Engineering, Sichuan University, Chengdu 610065, China  
Jun-qiang Xu b Department of Chemical and Biological Engineering, Chongqing Institute of Technology, Chongqing 400050, China  
Lin Zhong a Department of Chemical Engineering, Sichuan University, Chengdu 610065, China  
Abstract:
A plasma-assisted method was employed to prepare Ni/γ-Al2O3 catalyst for carbon dioxide reforming of methane reaction. The novel catalyst possessed higher activity and better coke-suppression performance than those of the conventional calcination catalyst. To achieve the same CH4 conversion, the conventional catalyst needed higher reaction temperature, about 50 °C higher than that of the N2 plasma-treated catalyst. After the evaluation test, the deactivation rate of the novel catalyst was 1.7%, compared with 15.2% for the conventional catalyst. Different from the characterization results of the calcined catalyst, a smaller average pore diameter and a higher specific surface area were obtained for the plasma-treated catalyst. The variations of the reduction peak temperatures and areas indicated that the catalyst reducibility was promoted by plasma assistance. The dispersion of nickel was also remarkably improved, which was helpful for controlling the ensemble size of metal atoms on the catalyst surface. The modification effect of plasmaassisted preparation on the surface property of alumina supported catalyst was speculated to account for the concentration increase of absorbed CO2. An enhancement of CO2 adsorption was propitious to the inhibition of carbon formation. The coke amount deposited on plasma treated catalyst was much smaller than that on the conventional catalyst.
Key words:  Nickel-based catalyst, Plasma, CO2 reforming of CH4, Coke, Adsorption of CO2
FundProject:
Glow Discharge Plasma-Assisted Preparation of Nickel-Based Catalyst for Carbon Dioxide Reforming of Methane
郭芳 a,储伟 a*,许俊强 b,钟林 a
摘要:
采用等离子体活化技术制备了一种新型Ni/γ-Al2O3催化剂用于CO2重整CH4反应. 等离子体强化制备的催化剂表现出较高的反应活性和较好的抗积碳能力. 为了达到相同CH4转化率,常规焙烧的催化剂需要比等离子体处理的催化剂高出50 °C 的反应温度. 反应结束后,等离子体处理催化剂的失活率仅为1.7%,而常规催化剂上的失活率为15.2%。通过对催化剂进行BET、H2-TPR、XRD、CO2-TPD和TG等表征分析,结果表明等离子体增强制备方法使催化剂的平均孔直径减小,比表面积增加;催化剂的还原性,镍物种的分散度和催化剂对CO2的吸附量都有显著的提高.
关键词:  镍基催化剂,等离子体,CO2重整CH4,积碳,CO2的吸附量
DOI:10.1088/1674-0068/21/05/481-486
分类号: