Study on the Effect and Mechanism of Hydrothermal Modification on TiO2 Catalysts for CO2 Photo-Thermal Reduction

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2025-01-03 DOI:10.1007/s10562-024-04906-5

Bin Guan, Junyan Chen, Zhongqi Zhuang, Lei Zhu, Zeren Ma, Xuehan Hu, Chenyu Zhu, Sikai Zhao, Kaiyou Shu, Hongtao Dang, Tiankui Zhu, Zhen Huang

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Abstract

Photocatalysts like TiO₂ can harness sunlight to reduce CO₂ into valuable hydrocarbon fuels, representing a promising solution for carbon neutrality and sustainable energy challenges. Herein, the effect of hydrothermal modification on the CO₂ photothermal reduction activity of TiO₂ catalyst was studied, through photo-catalytic performance test, XRD, Raman, N₂ adsorption, SEM, TEM, CO₂-TPD, UV-vis DRS, and PL on commercial and modified TiO₂. The results show that the hydrothermal-modified TiO₂-NBS is a pure anatase phase, which has a narrower band gap than the mixed anatase and rutile structure of commercial TiO₂-P25, and is more favorable to the excitation of photon-generated carriers. Meanwhile, the light emission intensity of anatase phase is weaker, which is conducive to electron-hole separation, promoting the reactant intermediate conversion. In addition, compared with TiO₂-P25, TiO₂-NBS has better morphology and specific surface pore characteristics, more adsorption sites for CO₂, and stronger adsorption strength, which facilitate the adsorption and activation reactions of CO₂. As a result, TiO₂-NBS exhibits stronger CO₂ photothermal reduction activity, with CO and CH₄ production rates of 6.49 µmol g⁻¹ h⁻¹ and 1.56 µmol g⁻¹ h⁻¹, which are 2.58 times and 2.84 times those of TiO₂-P25, respectively.

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水热改性TiO2催化剂对CO2光热还原的影响及机理研究

像TiO2这样的光催化剂可以利用阳光将二氧化碳减少为有价值的碳氢化合物燃料，代表了碳中和和可持续能源挑战的有希望的解决方案。本文通过光催化性能测试、XRD、Raman、N2吸附、SEM、TEM、CO2- tpd、UV-vis DRS、PL对商品TiO2和改性TiO2进行表征，研究水热改性对TiO2催化剂CO2光热还原活性的影响。结果表明：水热改性TiO2-NBS为纯锐钛矿相，其禁带宽度比商用TiO2-P25的锐钛矿和金红石混合结构更窄，更有利于激发光子生成的载流子。同时锐钛矿相的发光强度较弱，有利于电子-空穴分离，促进反应物中间转化。此外，与TiO2-P25相比，TiO2-NBS具有更好的形貌和比表面孔特征，对CO2的吸附位点更多，吸附强度更强，有利于CO2的吸附和活化反应。结果表明，TiO2-NBS具有较强的CO2光热还原活性，CO和CH4的产率分别为6.49µmol g−1 h−1和1.56µmol g−1 h−1，分别是TiO2-P25的2.58倍和2.84倍。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.