通过调节催化剂与环境的相互作用微调催化选择性:钯基催化剂的二氧化碳加氢反应

IF 11.5 Q1 CHEMISTRY, PHYSICAL
Hong Zhang, Ping Liu
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引用次数: 0

摘要

捕捉运行条件下的催化行为对于从机理上理解和促进稳健催化剂的设计至关重要。挑战在于难以监测催化剂与环境相互作用驱动的实时表面动态。在此,我们介绍一种基于密度泛函计算和动力学建模的框架。该框架通过量化环境对表面相和活性位点的影响,大大提高了理论模型描述实验观察结果的准确性。二氧化碳在钯基催化剂上的加氢反应就是一个例子。观察到的 Pd 和 Pd-M 双金属催化剂的选择性变化与典型 CO2 加氢条件下保持的氢覆盖率密切相关。通过减少表面氢的数量,选择性从甲酸有效地调整到 CO 和甲醇。这项研究不仅加深了人们对活性化学条件下活性位点动态的理解,还为通过调节催化剂与环境的相互作用进行催化调节提供了另一个机会。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fine-tuning catalytic selectivity by modulating catalyst-environment interactions: CO2 hydrogenation over Pd-based catalysts

Fine-tuning catalytic selectivity by modulating catalyst-environment interactions: CO2 hydrogenation over Pd-based catalysts
Capturing catalytic behaviors under operational conditions is pivotal to gaining a mechanistic understanding and promoting the design of robust catalysts. The challenge lies in the difficulty of monitoring real-time surface dynamics driven by catalyst-environment interactions. Here, we introduce a framework based on density functional calculations and kinetic modeling. This framework significantly improves the accuracy of theoretical models’ descriptions of experimental observations by quantifying environmental impacts on surface phases and active sites. CO2 hydrogenation over Pd-based catalysts is taken as a showcase. The observed selectivity variations of Pd and Pd-M bimetallic catalysts strongly correlate with hydrogen coverage maintained under typical CO2 hydrogenation conditions. By reducing the amount of surface hydrogen, the selectivity tuned effectively from formic acid toward CO and methanol. This study not only deepens the comprehension of dynamics of active sites under active chemical conditions but also introduces an alternative opportunity for catalytic tuning by modulating catalyst-environment interactions.
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来源期刊
CiteScore
10.50
自引率
6.40%
发文量
0
期刊介绍: Chem Catalysis is a monthly journal that publishes innovative research on fundamental and applied catalysis, providing a platform for researchers across chemistry, chemical engineering, and related fields. It serves as a premier resource for scientists and engineers in academia and industry, covering heterogeneous, homogeneous, and biocatalysis. Emphasizing transformative methods and technologies, the journal aims to advance understanding, introduce novel catalysts, and connect fundamental insights to real-world applications for societal benefit.
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