【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.更多还原

【Abstract】 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.更多还原