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<p>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<sub><i>x</i></sub>(AcO)<sub><i>y</i></sub> containing Pt<sup>II</sup> and Pt<sup>IV</sup> 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<sup>δ+</sup> particles interacting with cobalt ions on the zeolite surface. Their joint action and a possibility of formation of new Pt—O<sub><i>x</i></sub>—Co sites active in the preferential oxidation of CO ensure high efficiency and selectivity of the process in an H<sub>2</sub> 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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年9月1日

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

摘要

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 PtCox(AcO)y containing PtII and PtIV 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 Ptδ+ particles interacting with cobalt ions on the zeolite surface. Their joint action and a possibility of formation of new Pt—Ox—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.