低浓度甲烷催化燃烧特性及Cr催化剂的研究

采用浸渍法制备了不同Cr2O3含量的Cr2O3/γ-Al2O3系列催化剂,研究了Cr2O3/γ-Al2O3催化剂焙烧温度、甲烷浓度及反应空速对甲烷催化活性的影响,并考察了催化剂的抗硫中毒能力.结果表明,该法制备的Cr2O3/γ-Al2O3系列催化剂具有较好的低温催化活性,且随Cr2O3含量的增加,催化剂活性先增加后降低;Cr2O3含量为20％的Cr2O3/γ-Al2O3催化剂的甲烷催化燃烧活性与甲烷浓度呈正相关,与反应空速呈负相关关系.实验表明,400℃焙烧制备的Cr2O3含量为20％的Cr2O3/γ-Al2O3催化剂具有较好的甲烷低温催化活性,且具有较强的抗硫中毒能力.

STUDY ON CHARACTERISTICS OF CATALYTIC COMBUSTION OF LEAN METHANE AND Cr CATALYSTS

A series of Cr2O3/γ-Al2O3 catalysts with different Cr2O3 loading ratio were prepared by incipient wetness impregnation method.Then the influences of the calcination temperature,methane concentration and space velocity on the activity of palladium catalyst were investigated as well as their sulfur resistance ability.According to the research results,it is found that Cr2O3/γ-Al2O3 catalysts showed a good performance on catalytic activity,which enhanced with the increasing of Cr2O3 loading ratio at first and then decreased.It is also observed that the activity of Cr2O3/γ-Al2O3 catalyst with 20% Cr2O3 loading ratio was positive correlation with methane concentration,but negative correlation with space velocity.Based on an overall consideration,Cr2O3/γ-Al2O3 catalyst with 20% Cr2O3 loading ratio calcinated at 400 ℃ had the highest catalytic activity for lean methane oxidation as well as a relatively strong sulfur resistance ability.