Citation: Lina Guo, Ruizhe Li, Chuang Sun, Xiaoli Luo, Yiqiu Shi, Hong Yuan, Shuxin Ouyang, Tierui Zhang. Effect of Interlayer Anions in Layered Double Hydroxides on the Photothermocatalytic CO₂ Methanation of Derived Ni-Al₂O₃ Catalysts[J]. Acta Physico-Chimica Sinica, ;2025, 41(1): 100002. doi: 10.3866/PKU.WHXB202309002 shu

Effect of Interlayer Anions in Layered Double Hydroxides on the Photothermocatalytic CO₂ Methanation of Derived Ni-Al₂O₃ Catalysts

Lina Guo ¹ ,
Ruizhe Li ¹ ,
Chuang Sun ¹ ,
Xiaoli Luo ¹ ,
Yiqiu Shi ¹ ,
Hong Yuan ^1,, ,
Shuxin Ouyang ^1,, ,
Tierui Zhang ^2,,

1.
Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education; Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
2.
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Corresponding author: Hong Yuan, yuanhong@mail.ccnu.edu.cn Shuxin Ouyang, oysx@mail.ccnu.edu.cn Tierui Zhang, tierui@mail.ipc.ac.cn
Received Date: 1 September 2023
Revised Date: 6 October 2023
Accepted Date: 19 October 2023

Fund Project: the National Natural Science Foundation of China 21972052the National Natural Science Foundation of China 22272061Foundation Project of Hubei Key Laboratory of Radiation Chemistry and Functional Materials 2021KF01

The concentration of carbon dioxide (CO₂) in the atmosphere is progressively increasing due to industrial development, leading to environmental concerns such as the greenhouse effect. Consequently, it is crucial to decrease dependence on the fossil fuels and mitigate the CO₂ emissions. Photothermocatalysis technology facilitates the conversion of light energy into heat energy on the surface of catalysts, thereby driving chemical reactions. This catalytic approach effectively harnesses ample solar energy, consequently reducing non-renewable energy consumption. Solar-driven CO₂ methanation is an important route to simultaneously mitigate excessive carbon emissions and produce fuels. Layered double hydroxides (LDH) can be reduced at high temperature in a reductive atmosphere of a hydrogen/argon (H₂/Ar) mixture to prepare metal-loaded oxide (MO) catalysts, which are widely used in CO₂ hydrogenation reactions as excellent photothermal catalysts. However, there is limited study on how the interlayer anion type of LDH affects the activity of CO₂ methanation. Herein, a series of LDH precursors, intercalated with various anions, were synthesized using a co-precipitation method. The LDH precursors were reduced in a H₂/Ar atmosphere to acquire a group of nickel (Ni) loaded on alumina (Al₂O₃) catalysts, referred to as NiAl-x-MO (x = CO₃, NO₃, Cl, and SO₄, which represents carbonate, nitrate, chloride, and sulfate anions, respectively). Energy dispersive spectrometer (EDS) elemental mapping and X-ray photoelectron spectroscopy (XPS) results revealed the presence of nitrogen (N), chlorine (Cl), and sulfur (S) species on the surfaces of NiAl-NO₃-MO, NiAl-Cl-MO, and NiAl-SO₄-MO catalysts, respectively. Photothermocatalytic tests were conducted on the catalysts to assess the potential influence of the residual species on CO₂ methanation. Among them, the NiAl-CO₃-MO catalyst demonstrated a CO₂ conversion of 50.1%, methane (CH₄) selectivity of 99.9%, along with a CH₄ production rate of 94.4 mmol∙g⁻¹∙h⁻¹. The performance of the NiAl-NO₃-MO catalyst was found to be comparable to that of the NiAl-CO₃-MO catalyst. In contrast, the CO₂ methanation activity of the NiAl-Cl-MO and NiAl-SO₄-MO catalysts were negligible. CO₂ temperature programmed desorption (CO₂-TPD) analysis demonstrated that the presence of N, Cl, and S species had a negligible effect on the adsorption of CO₂. H₂ temperature programmed desorption (H₂-TPD) and density functional theory (DFT) results suggested that the strong coordination bond between residual Cl or S species and metallic Ni impeded the absorption and activation of H₂, which was responsible for the low CO₂ conversion. Hence, the significant role of the interlayer anion in LDH should be preferentially considered when designing LDH-derived catalysts, especially the Ni-based catalysts for hydrogenation reactions.
- Photothermocatalysis,
- CO₂ methanation,
- Ni-Al₂O₃ catalyst,
- Layered double hydroxides,
- Interlayer anion
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Effect of Interlayer Anions in Layered Double Hydroxides on the Photothermocatalytic CO₂ Methanation of Derived Ni-Al₂O₃ Catalysts