富氧空位TiO2制备及高效光热催化CO2还原

摘要/Abstract

摘要： 光热催化技术能将CO₂还原转化为化学燃料和工业原料,为应对全球变暖和能源危机的挑战提供了一条绿色、高效的新途径.采用溶胶-凝胶法结合热处理一步制备富氧空位TiO₂ (TiO_2－x)光热催化剂,利用XRD、XPS、TEM、EPR等多种手段对其微观形貌、晶体结构和光学性能进行表征分析,研究了光热催化剂投入量、气体总流速、光密度、CO₂/H₂比和温度等反应条件对TiO_2－x光热催化CO₂还原反应的影响规律并对参数进行了优化,探究了TiO_2－x光热催化机理.结果表明:TiO_2－x光热催化CO₂还原的主要产物为CO,其CO产率达到2.23 mmol·g^－1·h^－1,是商用TiO₂ (P25) CO产率的2.4倍;TiO_2－x光热催化CO产率是单独光催化CO产率的59.3倍,是单独热催化的1.77倍,光热协同催化的效率相比于单独光或热催化大幅提高.

关键词: CO₂还原, 光热催化, TiO₂, 氧空位

Abstract: Photothermal catalysis technology can reduce CO₂ into chemical fuels and industrial raw materials, providing a novel green and efficient way to deal with the challenges of global warming and energy crisis. Oxygen-rich vacancy TiO₂ (TiO_2－x) photothermal catalysts was prepared by the sol-gel method combined with heat treatment in one step.The microstructure, crystal structure and optical properties were characterized by XRD, XPS, TEM and EPR.The effects of reaction conditions such as the amount of photothermal catalyst, total gas flow rate, optical density, CO₂/H₂ ratio and temperature on the photothermal reduction of CO₂ by TiO_2－x were studied, the parameters were optimized, and the photothermal catalytic mechanism of TiO_2－x was explored too.The results showed that the main product of TiO_2－x photothermal catalytic CO₂ reduction is CO.The CO yields of TiO_2－x is 2.23 mmol·g^－1·h^－1, which is 2.4 times that of commercial TiO₂(P25).The CO yield of TiO_2－x photothermal catalysis is 59.3 times that of photocatalytic CO yield alone and 1.77 times that of thermal catalysis alone.The efficiency of photothermal synergistic catalysis is greatly improved compared to photocatalytic or thermal catalysis alone.

Key words: CO₂ reduction, photothermal catalysis, TiO₂, oxygen vacancies

中图分类号:

TB34
O643.3

李翠霞, 王安航, 栾竹程, 张鑫, 程曼. 富氧空位TiO₂制备及高效光热催化CO₂还原[J]. 兰州理工大学学报, 2025, 51(5): 14-20.

LI Cui-xia, WANG An-hang, LUAN Zhu-cheng, ZHANG Xin, CHENG Man. Preparation of oxygen-rich vacancy TiO₂ and efficient photothermal catalysis for CO₂ reduction[J]. Journal of Lanzhou University of Technology, 2025, 51(5): 14-20.

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富氧空位TiO₂制备及高效光热催化CO₂还原

Preparation of oxygen-rich vacancy TiO₂ and efficient photothermal catalysis for CO₂ reduction

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