Ni-Co/TiO_(2)增强CO_(2)加氢反应性能的研究  

Promotional Effect of Ni-Co/TiO_(2) Catalysts on CO_(2) Hydrogenation

作　　者：王兆宇 陈益宾 程锦添 张明文 WANG Zhaoyu;CHEN Yibin;CHENG Jintian;ZHANG Mingwen(Fujian Provincial Key Lab of Coastal Basin Environment,Fujian Polytechnic Normal University,Fuqing 350000,China)

机构地区：[1]福建技术师范学院近海流域环境测控治理福建省高校重点实验室,福清350000

出　　处：《高等学校化学学报》2023年第11期91-99,共9页Chemical Journal of Chinese Universities

基　　金：福建省自然科学基金(批准号:2020J05244,2020J05241,2020J01303,2020J01311)资助。

摘　　要：通过浸渍-沉淀法合成负载型双金属催化剂Ni-Co/TiO_(2),采用X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、X射线能谱(EDS)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)和氮气吸附-脱附(BET)对其晶型、形貌、组成、表面元素价态和比表面积进行表征.在CO_(2)加氢反应中,Ni-Co/Ti O_(2)催化剂在3 h反应时间内生成84.4μmol CH_4,相较于Ni/Ti O_(2)催化剂,其CH_4产量提高了46.3%.二氧化碳程序升温脱附(CO_(2)-TPD)和氢气程序升温还原(H_(2)-TPR)测试结果证实,Co的引入能增强Ni-Co/Ti O_(2)对CO_(2)的吸附和活化,从而促进其加氢反应效率的提高.经过5次循环活性测试,Ni/Ti O_(2)的活性降低了20.5%,而Ni-Co/Ti O_(2)的活性仅仅降低了10.9%,这表明Co的引入能够提高其活性稳定性.The Ni-Co/TiO_(2) catalysts were synthesized via an excess-solution impregnation method and fully charac-terized XRD,FESEM,EDS,TEM,XPS and N2 adsorption-desorption tests.In CO_(2) hydrogenation reaction for 3 h,Ni-Co/TiO_(2) catalyst exhibited a CH4 production of 84.4μmol,which was enhanced by 46.3%,compared with Ni/TiO_(2).Results of CO_(2)-TPD and H_(2)-TPR demonstrated that the introduced Co can facilitate the adsorption and activation of CO_(2) molecules to contribute to the CO_(2) hydrogenation reaction.In the activity stability tests for 5 cycles,the yield of CH4 was reduced by 20.5%over Ni/TiO_(2),while that over Ni-Co/TiO_(2) was only by 10.9%,revealing that the introduced Co can also enhance the catalytic stability for the reaction.This study may provide some guidance for the design and synthesis of high-efficiency catalysts for CO_(2) hydrogenation.

关 键 词：二氧化碳加氢反应 镍-钴/二氧化钛 二氧化碳吸附 二氧化碳活化 甲烷 

分 类 号：O643.3[理学—物理化学]