光辐照驱动CH_4-CO_2重整中Ni/MgO-Al_2O_3催化活性吸收体的活性  

Catalytic Activity of Ni/MgO-Al_2O_3 Catalytically Activated Absorber for CO_2 Reforming with CH_4 Driven by Direct Light Irradiation

作　　者：龙华丽[1] 胡诗婧[1] 徐艳[1] 覃攀[1] 尚书勇[1,2] 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8期1393-1399,共7页

基　　金：国家自然科学基金(11075113)~~

摘　　要：将等离子体还原法和常规焙烧还原法制备的Ni基催化剂用于制备太阳能催化活性吸收体,在氙灯模拟的太阳光聚光反应系统中,考察了其催化CH4-CO2重整反应活性.结果表明,等离子体还原法制备的Ni/MgO-Al2O3催化活性吸收体的低温活性最高,在光辐照平均能流密度为61kW/m2,空速36dm3/(g·h),CH4和CO2的转化率分别为72.7%和54.5%,光能转化为化学能的效率达到42.8%.X射线衍射和透射电镜结果表明,等离子体还原的催化剂中活性组分Ni的分散性最好,平均粒径为5nm,明显小于常规催化剂.另外,助剂MgO的加入增强了载体碱性,同时降低了CH4深度裂解产生积炭的可能性.Nickel-based catalyst samples prepared by the plasma reduction method and thermal method were used to make catalytically acti-vated absorbers,and their activity for solar CO2 reforming with CH4 was tested using a laboratory-scale receiver-reactor with a sun-simulator.The results showed that the catalytically activated absorber of Ni/MgO-Al2O3 reduced by plasma had the highest activity at low temperature.Under the conditions of average ？ux density of 61 kW/m2 and gas hourly space velocity of 36 dm3/（g·h）,the CO2 and CH4 conversion was 54.5% and 72.7%,respectively,and the chemical storage efficiency reached 42.8%.The X-ray diffraction and transmission electron microscopy results indicated that the catalyst reduced by plasma exhibited higher dispersion of nickel and smaller crystal size than the catalyst reduced by the thermal method.The addition of MgO enhanced the basicity of the support and reduced the probability of carbon deposition on Ni/MgO-Al2O3.

关 键 词：等离子体 甲烷 二氧化碳 重整 光辐照 镍基催化剂 氧化镁 氧化铝 

分 类 号：O643.36[理学—物理化学]