Flaky atomic-scale Pt/CeO2 catalyst with ultrahigh Pt loading capacity and preparation method of flaky atomic-scale Pt/CeO2 catalyst

Abstract

The invention provides a flaky atomic-scale Pt / CeO2 catalyst with ultrahigh Pt loading capacity. The flaky atomic-scale Pt / CeO2 catalyst comprises chloroplatinic acid, an organic matter containing a reducing group and cerium salt, the mass ratio of the organic matter containing the reducing group to the cerium salt is (0.1-2): 1, and the molar ratio of the chloroplatinic acid to the cerium salt is (0.01-0.2): 1. The preparation method of the catalyst comprises the following steps: dissolving chloroplatinic acid, an organic matter and cerium salt in deionized water to obtain a mixed solution; atomizing the mixed solution, introducing generated micro fog drops into a tubular furnace for high-temperature treatment, and collecting orange yellow powder at the other end of the tubular furnace; and carrying out heat treatment on the orange-yellow powder, and removing residual organic matters to obtain the atomic-scale Pt / CeO2 catalyst with ultrahigh Pt loading capacity. Compared with the traditional metal oxide loaded atomic-scale catalyst, the loading capacity of the active metal Pt of the catalyst prepared by the invention is ultrahigh, the catalyst still presents an atomic-scale dispersed state when the loading capacity is 10%, and the catalytic water vapor shift performance of the catalyst is remarkably excellent. The commercial CeO2 carrier prepared Pt / CeO2 catalyst and the microsphere-shaped atomic-scale Pt / CeO2 catalyst are used as the commercial CeO2 carrier prepared Pt / CeO2 catalyst and the microsphere-shaped atomic-scale Pt / CeO2 catalyst.

Description

technical field [0001] The invention relates to the field of supported catalysts and heterogeneous catalysis, in particular to a sheet-like atomic-level Pt / CeO with ultra-high Pt loading 2 Catalyst and preparation method thereof. Background technique [0002] Human development is inseparable from the chemical industry. Catalysis is the "engine" of the chemical industry, and its core is the catalyst. The most widely used are supported catalysts, which are mainly composed of active metals and supports. Especially for reactions that require noble metal catalysis, supported catalysts both improve efficiency and reduce noble metal usage. The activity of supported catalysts is determined by the nature and number of active sites, and the key influencing factor is the dispersion of active metals. The dispersion characteristics not only determine the number of active sites and atomic utilization, but also affect the interface properties of the active metal / support. From the persp...

AI Technical Summary

Problems solved by technology

However, the existing atomic-scale catalyst preparation technology cannot realize the preparation of atomic-scale catalysts supported by metal oxides with a loading higher than 5%.

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