CAJ | 학술논문

以La_2O_3为载体,采用浸渍法制备了10%Ni/La_2O_3催化剂,考察了该催化剂的CO_2甲烷化反应性能.结果表明,在较低的温度(350℃)和高空速(约30000 h~(-1))下,甲烷时空收率可大于3000 g/(kg-h),无论转化率高低,甲烷选择性始终保持在100%.X射线衍射和H2-程序升温还原等表征结果表明,CO_2在Ni/La_2O_3催化剂上的加氢机理可能与Ni/γ-Al_2O_3上不同,并且La_2O_2CO_3的形成有利于提高催化剂活性.
이La_2O_3위재체,채용침지법제비료10%Ni/La_2O_3최화제,고찰료해최화제적CO_2갑완화반응성능.결과표명,재교저적온도(350℃)화고공속(약30000 h~(-1))하,갑완시공수솔가대우3000 g/(kg-h),무론전화솔고저,갑완선택성시종보지재100%.X사선연사화H2-정서승온환원등표정결과표명,CO_2재Ni/La_2O_3최화제상적가경궤리가능여Ni/γ-Al_2O_3상불동,병차La_2O_2CO_3적형성유리우제고최화제활성.
The methanation of carbon dioxide on a Ni/La_2O_3 catalyst containing 10 wt% Ni prepared by the impregnation method was studied. The space-time yield of methane was 3000 g/(kg-h) at conditions of 350 ℃, GHSV of 30000 h~-1, 1.5 MPa pressure, and H_2/CO_2 molar ratio of 4/1. The selectivity for methane was 100% with different CO_2 conversions. Combined with X-ray diffraction and H_2 temperature-programmed reduction analyses, this suggested that the reaction mechanism on Ni/La_2O_3 may be different from that on Ni/γ-Al_2O_3. The formation of lanthanum oxycarbonate (La_2O_2CO_3) can play an important role in the activation of CO_2.