光辐照驱动CH4-CO2重整中Ni/MgO-Al2O3催化活性吸收体的活性

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-A12O3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61 kW/m2,空速36 dm3/(g·h),CH4和CO...

Catalytic Activity of Ni/MgO-Al2O3 Catalytically Activated Absorber for CO2 Reforming with CH4 Driven by Direct Light Irradiation

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.