Li或Na掺杂对CO2甲烷化Ru/TiO2催化剂的影响

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2025-02-20 DOI:10.1016/j.cattod.2025.115245

Stefano Cimino, Elisabetta Maria Cepollaro, Luciana Lisi

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引用次数: 0

摘要

在CO2甲烷化过程中，金属-载体相互作用可以广泛影响甚至主导负载型Ru纳米颗粒的催化活性、选择性和稳定性。在这项工作中，我们报告了用Li或Na（3 % wt.）掺杂Ru/TiO2催化剂的效果，其总体目标是提供大量的弱/中等强度的表面碱性位点，能够促进CO2在低温下的吸附和甲烷化。然而，催化动力学测量表明，两种碱金属通过不同的机制阻碍母体催化剂的活性。通过详细的催化剂表征（通过XRD、孔隙度分析、CO-DRIFTS、CO2-TPD和H2-TPSR）和operando DRIFTS实验，通过与γ-Al2O3负载的类似ru催化剂的结果比较，评估了对co2衍生吸附和中间物质类型以及可能的反应途径的具体影响

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On the effect of Li or Na doping on Ru/TiO2 catalyst for CO2 methanation

Metal-support interactions can widely affect or even dominate the catalytic activity, selectivity, and stability of supported Ru nanoparticles during the CO₂ methanation. In this work, we report on the effects of doping a Ru/TiO₂ catalyst with either Li or Na (3 % wt.) with the general aim to provide a large pool of surface basic sites of weak/medium strength capable to promote CO₂ adsorption and methanation at low temperature. However, catalytic kinetic measurements show that both alkali metals hinder the activity of the parent catalyst by different mechanisms. Detailed catalysts characterization (by XRD, porosimetric analysis, CO-DRIFTS, CO₂-TPD and H₂-TPSR) and operando DRIFTS experiments are used to evaluate the specific impact on the type of CO₂-derived adsorbed and intermediate species and on possible reaction pathways by also comparing the results with analogue Ru-catalysts supported on γ-Al₂O₃

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.