介质阻挡放电等离子制备5Ni-5La/SiO_(2)催化剂及其甲烷干重整反应催化性能  

5Ni-5La/SiO_(2)Catalysts Prepared by Dielectric Barrier Discharge Plasma Applying in the Dry Reforming of Methane

作　　者：王雅芝 贾显枝 张宏港 刘璐[1] 赵彬然[1] WANG Yazhi;JIA Xianzhi;ZHANG Honggang;LIU Lu;ZHAO Binran(International Scientific&Technological Cooperation Base for Clean Utilization of Hydrocarbon Resources,Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy,School of Chemical Engineering,Northwest University,Xi’an 710069,China)

机构地区：[1]西北大学化工学院,国家碳氢资源清洁利用国际科技合作基地,陕北能源先进化工利用技术教育部工程研究中心,西安710069

出　　处：《高等学校化学学报》2023年第2期106-113,共8页Chemical Journal of Chinese Universities

基　　金：陕西省重点研发计划项目(批准号:2020ZDLGY11-06);国家自然科学基金(批准号:21406177)资助.

摘　　要：利用介质阻挡放电等离子体法制备了5Ni-5La/SiO_(2)催化剂,并用于甲烷干重整反应.在常压,700℃,空速为4.8×10^(4)mL·g^(‒1)·h^(‒1)时,等离子体法所制催化剂催化甲烷干重整反应的CH_(4)和CO_(2)的转化率分别为81.2%和88.4%,且在30 h内保持稳定;而传统催化剂的CH4和CO_(2)初始转化率分别为81%和88.4%,30 h后下降到58.8%和68.6%.研究结果表明,介质阻挡放电等离子体法制备的催化剂具有更高的分散性和更强的金属与La_(2)O_(3)的相互作用.等离子体处理增加了Ni周围的电子密度,增强了CO_(2)在催化剂表面的吸附能力和活化能力,促进了HCOO^(‒)中间体的生成,有利于反应正向进行.Ni-La catalysts were prepared using dielectric barrier discharge plasma method and applied in the dry reforming of methane.CH_(4)conversion and CO_(2)conversion for the plasma-treated catalysts were 81.2%and 88.4%,respectively,and the catalyst remained stable within 30 h.While for conventional catalyst,the initial conversion rates of CH4 and CO_(2)were 81%and 88.4%,respectively,which finally decreased to 58.8%and 68.6%after 30 h.Thus,the stability of the catalyst prepared by the plasma method was significantly improved.The characterization results showed that the catalyst prepared by dielectric barrier discharge plasma has higher dispersion and stronger Ni-La_(2)O_(3)interaction.The plasma treatment increased the electron density around Ni,which could enhance the adsorption and activation of CO_(2)on the surface of the catalyst,promote the formation of HCOO^(−) intermediates,and facilitate the positive progress of the reaction.

关 键 词：等离子体 甲烷干重整 镍基催化剂 三氧化二镧 

分 类 号：O643.36[理学—物理化学] O614.81[理学—化学]