One-step synthesis of PtCo/ZSM-5 catalysts for preferential CO oxidation in a hydrogen excess

IF 1.7 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Russian Chemical Bulletin Pub Date : 2025-10-20 DOI:10.1007/s11172-025-4756-6

M. I. Shilina, I. N. Krotova, O. V. Udalova, I. P. Stolyarov, N. V. Cherkashina, T. N. Rostovshchikova

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Abstract

A new one-step method for the synthesis of the PtCo/ZSM-5 catalysts for CO oxidation was proposed. Heteronuclear acetate complexes of the empirical composition PtCo_x(AcO)_y containing Pt^II and Pt^IV in ratios with Co of 1: 1 or 1: 2 were used as precursors. According to the data of scanning and transmission electron microscopy and XPS, the impregnation of the HZSM-5 zeolite (Si/Al = 28) with a solution of the complexes in glacial acetic acid followed by decomposition at 200 or 300 °C leads to the stabilization of highly dispersed partially reduced Pt^δ+ particles interacting with cobalt ions on the zeolite surface. Their joint action and a possibility of formation of new Pt—O_x—Co sites active in the preferential oxidation of CO ensure high efficiency and selectivity of the process in an H₂ excess. At the relatively low Pt content from 0.1 to 0.3 wt.%, the complete conversion of CO on these catalysts is achieved in the wide temperature range from 50 to 130 °C.

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一步法合成PtCo/ZSM-5型超氢CO优先氧化催化剂

提出了一种一步法合成PtCo/ZSM-5 CO氧化催化剂的新方法。以经验成分PtCox(AcO)y含PtII和PtIV的异核醋酸盐配合物为前驱体，其与Co的比例为1:1或1:2。扫描电镜、透射电镜和XPS数据表明，HZSM-5沸石（Si/Al = 28）在冰醋酸溶液中浸渍，然后在200或300℃下分解，导致高度分散的部分还原Ptδ+颗粒与沸石表面的钴离子相互作用而稳定。它们的共同作用和形成新的Pt-Ox-Co位点的可能性在CO的优先氧化中具有活性，确保了该过程在H2过量下的高效率和选择性。在Pt含量相对较低的情况下（0.1 ~ 0.3 wt.%），在50 ~ 130℃的宽温度范围内，CO在这些催化剂上完全转化。

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来源期刊

Russian Chemical Bulletin 化学-化学综合

CiteScore

2.70

自引率

47.10%

发文量

257

审稿时长

3-8 weeks

期刊介绍： Publishing nearly 500 original articles a year, by leading Scientists from Russia and throughout the world, Russian Chemical Bulletin is a prominent international journal. The coverage of the journal spans practically all areas of fundamental chemical research and is presented in five sections: General and Inorganic Chemistry; Physical Chemistry; Organic Chemistry; Organometallic Chemistry; Chemistry of Natural Compounds and Bioorganic Chemistry.