A selective TiO2-x/Ni catalyst derived from NiTi-layered double hydroxides for efficient photothermal CO2 methanation

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-09-28 DOI:10.1016/j.apcata.2025.120613

Chi Zhang , Junwen Zhang , Lina Che , Xusheng Wang , Li Shi

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引用次数: 0

Abstract

Photothermal technology offers distinct advantages for catalytic CO₂ methanation. Herein, we synthesized a series of Ni-based catalysts (denoted as TiO_2-x/Ni-X) through controlled calcination of NiTi-layered double hydroxides (LDHs) precursors at 400–700°C. In a continuous-flow system under xenon lamp irradiation (3.2 W/cm²), the TiO_2-x /Ni-X catalysts exhibited a reduction temperature dependent CH₄ production rate. During 40-hour stability testing, the optimized TiO_2-x/Ni-550 catalyst achieved a sustained CH₄ production rate of 180 mmol g_cat⁻¹ h⁻¹ with a remarkable near-unity selectivity (>99 %), and the light irradiation substantially enhanced the CH₄ yield compared to bare thermal catalysis. Comprehensive structural characterization and mechanistic studies revealed competing roles governing catalytic activity, with TiO_2-x/Ni-550 demonstrating an optimal balance for CH₄ generation kinetics.

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基于niti层状双氢氧化物的选择性TiO2-x/Ni催化剂用于高效光热CO2甲烷化

光热技术为催化二氧化碳甲烷化提供了明显的优势。在此，我们通过在400-700℃下对niti层状双氢氧化物（LDHs）前驱体进行控制煅烧，合成了一系列ni基催化剂（记为TiO2-x/Ni-X）。在氙灯照射下（3.2 W/cm²）的连续流系统中，TiO2-x /Ni-X催化剂的CH4产率与还原温度有关。经过40小时的稳定性测试，优化后的TiO2-x/Ni-550催化剂的CH4产率持续为180 mmol gcat−1 h−1，具有显著的近统一选择性（>99 %），与裸热催化相比，光照射显著提高了CH4产率。综合结构表征和机理研究揭示了控制催化活性的竞争作用，TiO2-x/Ni-550显示了CH4生成动力学的最佳平衡。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.