摘要
在流化床反应器中,考察了Ni/SiO2催化剂上CH4或CH4-C3H8临氧CO2重整(自热重整)制合成气反应性能.结果表明,在CH4-C3H8混合气自热重整反应中,Ni粒径较小催化剂的活性和抗积炭性能较高,CH4和CO2转化率分别达75.5%和72.6%.C3H8比CH4更易解离及被氧化,部分C3H8解离出来的中间产物CHx物种可与吸附H结合为CH4,因而降低了CH4的表观转化率;CHx也可与吸附的CO2物种反应生成H2与CO,从而促进了CO2的转化.
The catalytic properties of Ni/SiO2 catalysts with different Ni particle size for the oxy-reforming of methane or methane-propane with CO2 and O2（autothermal reforming） in a fluidized-bed reactor were investigated.The results show that Ni/SiO2 catalysts with smaller Ni particle size exhibit higher catalytic activity and improved resistance to carbon deposition.The conversion of methane and carbon dioxide was 75.5% and 72.6%,respectively,for the methane-propane autothermal reforming reaction.The propane dissociates and is oxidized more easily than methane.The CHx intermediate species from propane dissociation combines with the adsorbed hydrogen to produce methane,which results in a decrease in the apparent conversion of methane.Additionally,H2 and CO are generated by the reaction with adsorbed CO2,which promotes the conversion of the CO2.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第9期1115-1121,共7页
基金
国家自然科学基金(90610002
Z406142)
国家重点基础研究发展计划(973计划
2007CB210207)
国家高技术研究发展计划(863计划
2007AA05Z415)
浙江省科技厅重点项目(2008C12055)
浙江林学院科学发展基金(2008FR052)
关键词
甲烷
丙烷
自热重整
合成气
镍
氧化硅
负载型催化剂
methane
propane
autothermal reforming
synthesis gas
nickel
silica
supported catalyst
