常压高频放电等离子体炬改进制备CO_2/CH_4重整用Ni/MgO催化剂  

Atmospheric High Frequency Discharge Plasma Jet Improved Preparation of Ni/MgO Catalyst for CO_2 Reforming with CH_4

作　　者：覃攀[1] 徐慧远[2] 龙华丽[1] 冉祎[1] 尚书勇[2] 储伟[1] 印永祥[1] 戴晓雁[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]宜宾学院化学与化工学院,四川宜宾644000

出　　处：《催化学报》2011年第7期1262-1268,共7页

基　　金：国家自然科学基金(11075113);宜宾学院博士科研启动基金(2010B12)~~

摘　　要：比较了常规法、等离子体炬法和等离子体炬辅助焙烧法制得的Ni/MgO催化剂上CO2/CH4重整反应性能差异,并利用X射线衍射、透射电镜、X射线光电子能谱和CO2程序升温表面反应等技术对反应前后催化剂进行了表征.结果表明,采用等离子体炬辅助焙烧法制备的催化剂上Ni晶粒粒径小,分散度较高,低温活性和抗积炭性能较高;在常压,750oC,36L/(h·g),n(CH4)/n(CO2)=1的反应条件下,CO2和CH4转化率分别为90.7%和89.4%,反应36h催化剂无明显失活.A Ni/MgO catalyst was prepared using atmospheric high frequency discharge plasma jet. The influence of three preparation meth-ods,the conventional method,plasma method,and plasma plus calcination method,on the catalyst activity was compared using CO2 reform-ing with methane as the probe reaction. The catalyst samples were characterized by X-ray diffraction,transmission electron microscopy,X-ray photoelectron spectroscopy,and CO2 temperature-programmed surface reaction. The results suggested that the Ni-based catalyst sam-ple prepared by the plasma plus calcination method possessed smaller Ni particle size,higher dispersion of active components,higher low-temperature activity,and enhanced anti-coking ability. The conversions of CO2 and CH4 were 90.70% and 89.37%,respectively,and lasted for 36 h without obvious deactivation under 0.1 MPa,36 L/（h·g） and 750 oC with n（CH4） /n（CO2）= 1.

关 键 词：镍 氧化镁 二氧化碳 甲烷 重整 常压高频放电等离子体炬 

分 类 号：O643.36[理学—物理化学]