铋通过调节反应物吸附和反应路线，促进CO对Pt/Al2O3的优先氧化

IF 13.2 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-01-20 DOI:10.1016/j.cej.2025.159751

Yake Lou, Qianqiu Wu, Jia Shen, Núria J. Divins, Jordi Llorca, Yanglong Guo, Wangcheng Zhan, Aiyong Wang, Li Wang, Yun Guo

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引用次数: 0

摘要

优先氧化CO （CO- prox）反应是氢净化的一个有吸引力的选择，其中最常用的pt基催化剂遭受令人不满意的低温活性。本文通过引入铋（Bi）来提高Pt/Al2O3对CO- prox反应的催化性能，在80 ℃左右，Pt-0.5 wt% Bi/Al2O3的CO转化率是Pt/Al2O3的3倍，在112-175 ℃范围内，CO可以完全氧化，理论O2选择性为50 %。此外，Pt-0.5 wt% Bi/Al2O3即使在CO2和H2O存在下也表现出良好的稳定性。表征结果表明，Pt倾向于选择性沉积在Bi2O3上，由于电子从Pt转移到Bi，进一步降低了CO的吸附强度。同时，在Pt-O-Bi界面处O2活化得到加强，CO和H2的竞争吸附也得到调节。Bi的存在增强了H2的促进作用，进一步促进了CO-PROX反应活性中间体HCOO -的生成。

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Bismuth Boosts the Preferential oxidation of CO over Pt/Al2O3 by Regulating the Reactant adsorption and reaction route

Preferential oxidation of CO (CO-PROX) reaction is an attractive option for hydrogen purification, where the most commonly used Pt-based catalysts suffer from unsatisfactory low-temperature activity. Here, bismuth (Bi) was introduced to improve the catalytic performance of Pt/Al₂O₃ for the CO-PROX reaction, and the CO conversion of Pt-0.5 wt% Bi/Al₂O₃ was threefold higher than that of Pt/Al₂O₃ at around 80 °C and CO could be completely oxidized in the range of 112–175 °C with theoretical O₂ selectivity (50 %). Besides, the Pt-0.5 wt% Bi/Al₂O₃ exhibited great stability even in the presence of CO₂ and H₂O. The characterization results showed that Pt tended to selectively deposit on Bi₂O₃, which further decreased CO adsorption intensity due to electron transfer from Pt to Bi. Meanwhile, O₂ activation can be strengthened at the Pt-O-Bi interface and the competitive adsorption between CO and H₂ can also be tuned. The presence of Bi strengthened the promotion effect of H₂ and further promoted the generation of HCOO– species, which were the active intermediates of the CO-PROX reaction.

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.