CAJ | 학술논문

采用沉淀法与浸渍法相结合,以氧化镍为活性组分,氧化铝和氧化锆为载体,氧化镧为助剂分别制备了含镧(La)的高温甲烷化催化剂.采用X射线荧光光谱(XRF)、X射线粉末衍射(XRD)、N2吸附和程序升温还(H2-TPR)等表征手段,对催化剂进行了分析表征,重点考察了镧不同加入方式对催化剂的结构特性的影响.结果表明,催化剂的主要物相是NiO,与未加入La相比,不论以何种方式加入La都提高了NiO的衍射峰强度,抑制NiAl2O4的生成,催化剂的比表面积和孔容都有所增大.La的加入使催化剂中的NiO易于还原,峰强度也有所增加.
채용침정법여침지법상결합,이양화얼위활성조분,양화려화양화고위재체,양화란위조제분별제비료함란(La)적고온갑완화최화제.채용X사선형광광보(XRF)、X사선분말연사(XRD)、N2흡부화정서승온환(H2-TPR)등표정수단,대최화제진행료분석표정,중점고찰료란불동가입방식대최화제적결구특성적영향.결과표명,최화제적주요물상시NiO,여미가입La상비,불론이하충방식가입La도제고료NiO적연사봉강도,억제NiAl2O4적생성,최화제적비표면적화공용도유소증대.La적가입사최화제중적NiO역우환원,봉강도야유소증가.
We prepared high temperature methanation catalyst containing lanthanum (La) respectively by precipitation method and impregnation method combining, and take nickel oxide as an active component, alumina and zirconia as the carrier, lanthanum oxide as additives. Using X ray fluorescence (XRF), X ray powder diffraction (XRD),N2 adsorption and temperature-programmed (H2-TPR)to analysis and characterization for catalyst, focuses on the effects on the structure characteristics of methanation catalyst for different adding methods of lanthanum. The results show that, the main catalyst is NiO, compared with no added La, the intensity of diffraction peak of NiO is improved no matter take which way to add La, and inhibit the production of NiAl2O4;The catalyst surface area and pore volum are increased, added to La make the catalyst in the NiO is easy to restore, peak strength also increased.