高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (11): 20230308.doi: 10.7503/cjcu20230308

• 物理化学 • 上一篇    下一篇

Ni-Co/TiO2增强CO2加氢反应性能的研究

王兆宇(), 陈益宾, 程锦添, 张明文   

  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
  • 收稿日期:2023-06-30 出版日期:2023-11-10 发布日期:2023-09-11
  • 通讯作者: 王兆宇 E-mail:1058238843@qq.com
  • 基金资助:
    福建省自然科学基金(2020J05244)

Promotional Effect of Ni-Co/TiO2 Catalysts on CO2 Hydrogenation

WANG Zhaoyu(), CHEN Yibin, CHENG Jintian, ZHANG Mingwen   

  1. Fujian Provincial Key Lab of Coastal Basin Environment,Fujian Polytechnic Normal University,Fuqing 350000,China
  • Received:2023-06-30 Online:2023-11-10 Published:2023-09-11
  • Contact: WANG Zhaoyu E-mail:1058238843@qq.com
  • Supported by:
    the Natural Science Foundation of Fujian Province, China(2020J05244)

摘要:

通过浸渍-沉淀法合成负载型双金属催化剂Ni-Co/TiO2, 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CO2加氢反应中, Ni-Co/TiO2催化剂在3 h反应时间内生成84.4 μmol CH4, 相较于Ni/TiO2催化剂, 其CH4产量提高了46.3%. 二氧化碳程序升温脱附(CO2-TPD)和氢气程序升温还原(H2-TPR)测试结果证实, Co的引入能增强Ni-Co/TiO2对CO2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/TiO2的活性降低了20.5%, 而Ni-Co/TiO2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.

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

Abstract:

The Ni-Co/TiO2 catalysts were synthesized via an excess-solution impregnation method and fully characterized XRD, FESEM, EDS, TEM, XPS and N2 adsorption-desorption tests. In CO2 hydrogenation reaction for 3 h, Ni-Co/TiO2 catalyst exhibited a CH4 production of 84.4 μmol, which was enhanced by 46.3%, compared with Ni/TiO2. Results of CO2-TPD and H2-TPR demonstrated that the introduced Co can facilitate the adsorption and activation of CO2 molecules to contribute to the CO2 hydrogenation reaction. In the activity stability tests for 5 cycles, the yield of CH4 was reduced by 20.5% over Ni/TiO2, while that over Ni-Co/TiO2 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 CO2 hydrogenation.

Key words: CO2 hydrogenation reaction, Ni-Co/TiO2, CO2 adsorption, CO2 activation, CH4

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