Tuning support morphology to control alloy over PtCo/γ-Al2O3 for the preferential oxidation of CO

Q3 Energy

燃料化学学报 Pub Date : 2025-01-01 DOI:10.1016/S1872-5813(24)60466-4

Lichuan SONG, Liding ZHONG, Jia SHEN, Yake LOU, Yun GUO, Li WANG

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引用次数: 0

Abstract

The preferential oxidation of CO (CO-PROX) reaction is a cost-effective method for eliminating trace amounts of CO from the fuel H₂. Pt-based catalysts have been extensively studied for CO-PROX, with their activity influenced by the morphology of the support. Hydrothermal synthesis was employed to produce different morphologies of γ-Al₂O₃: flower-like γ-Al₂O₃(f) exposing (110) crystal faces, sheet-like γ-Al₂O₃(s) revealing (100) crystal faces, and rod-like γ-Al₂O₃(r) displaying (111) crystal faces, followed by loading PtCo nanoparticles. The exposed crystal faces of the support impact the alloying degree of the PtCo nanoparticles, and an increase in the alloying degree correlates with enhanced catalyst reactivity. Pt₃Co intermetallic compounds were identified on γ-Al₂O₃(f) exposing (110) crystal faces, and PtCo/γ-Al₂O₃(f) showed high catalytic activity in the CO-PROX reaction, achieving 100% CO conversion across a broad temperature range of 50−225 °C. In contrast, only partial alloying of PtCo was observed on γ-Al₂O₃(s). Furthermore, no alloying between Pt and Co occurred in PtCo/γ-Al₂O₃(r), resulting in a reaction rate at 50 °C that was merely 11% of that of PtCo/γ-Al₂O₃(f). The formation of Pt₃Co intermetallic compounds led to a more oxidized state of Pt, which significantly diminished the adsorption of CO on Pt and augmented the active oxygen species, thereby facilitating the selective oxidation of CO.

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.