La促进水滑石衍生镍基催化剂的原位制备及其CO_(2)甲烷化性能  

La promoted hydrotalcite derived Ni⁃based catalysts:In situ preparation and CO_(2) methanation performance

作　　者：杨文 王迪迪 黄子怡 周亚平 冯艳艳 YANG Wen;WANG Didi;HUANG Ziyi;ZHOU Yaping;FENG Yanyan(Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials,Department of Chemistry and Bioengineering,Guilin University of Technology,Guilin,Guangxi 541004,China)

机构地区：[1]桂林理工大学化学与生物工程学院,广西电磁化学功能物质重点实验室,桂林541004

出　　处：《无机化学学报》2024年第3期561-570,共10页Chinese Journal of Inorganic Chemistry

基　　金：广西自然科学基金(No.2017GXNSFBA198124,2017GXNSFBA198193);国家自然科学基金(No.21606058)资助。

摘　　要：采用原位生长法制备水滑石衍生Ni-La/Al_(2)O_(3)催化剂,并用于CO_(2)甲烷化反应,以研究La掺杂量对所得催化剂形貌结构及催化性能的影响。利用电感耦合等离子体发射光谱、X射线衍射、氢气程序升温还原、低温氮气吸附-脱附、扫描电镜和透射电镜对催化剂的形貌结构进行分析。结果表明,适宜的La掺杂量能够提高活性金属Ni在载体中的分散性,减弱Ni与载体的相互作用,并且改善催化剂的孔隙结构,提高催化剂的比表面积。CO_(2)甲烷化性能表明,当Ni负载量(质量分数)为30%、La掺杂量(质量分数)为10%时,催化剂30Ni-10La/Al_(2)O_(3)具有较优的催化性能;350℃时其CO_(2)转化率及CH_(4)产率分别达到91.9%和91.5%,并且连续测试60 h后催化性能基本保持不变。The Ni-La/Al_(2)O_(3) catalysts derived from hydrotalcite were prepared by an in-situ growth method and applied in CO_(2) methanation to investigate the influence of La doping amount on the morphology,structure,and catalytic performance of the catalysts.The morphology and structure of the obtained catalysts were analyzed by inductively-coupled plasma emission spectroscopy,X-ray diffraction,H_(2) temperature programmed reduction,low-temperature N2 adsorption-desorption,scanning electron microscopy,and transmission electron microscopy,respec-tively.The characterization results indicated that an appropriate amount of La doping could improve the dispersion of active metal Ni on the support,weaken the interaction between Ni and the support,improve the pore structure of the catalyst,and increase the specific surface area of the catalyst.The results of CO_(2) methanation showed that the catalyst 30Ni-10La/Al_(2)O_(3) with the Ni loading(mass fraction)of 30%and La doping of 10%possessed the outstand-ing catalytic performance,which exhibited the CO_(2) conversion of 91.9%and CH_(4) yield of 91.5%under 350℃.Moreover,the catalyst 30Ni-10La/Al_(2)O_(3) remained highly active after the stability test of 60 h.

关 键 词：CO_(2)甲烷化 水滑石衍生催化剂 LA掺杂 高分散性 

分 类 号：O643.3[理学—物理化学] O614.33[理学—化学]