Effect of Chitosan on the Electronic State and Distribution of Rhodium on the Zeolite Catalyst Surface According to Data on IR Spectroscopy of Adsorbed Carbon Monoxide

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Resumo

Zeolite catalysts for the conversion of dimethyl ether to light olefins with a monoatomic distribution of rhodium are studied via infrared spectroscopy of the diffuse reflection of adsorbed carbon monoxide and X-ray absorption spectroscopy. The zeolite is preliminarily treated with ultrasound to obtain a monatomic distribution of the active component on the support’s surface, and a polymer (chitosan hydrochloride) is used as the medium for dispersing rhodium at the stage of impregnation. A sample prepared via the traditional impregnation of zeolite with an aqueous solution of rhodium chloride is studied for purposes of comparison. It is shown that rhodium in the structure of zeolite treated with ultrasound is in the form of isolated metal centers whether it is deposited with or without a polymer. Synthesis with chitosan results in a more disperse distribution of rhodium on the outer surface of the zeolite and greater oxidizing ability of the catalyst.

Sobre autores

M. Shilina

Faculty of Chemistry, Moscow State University

Email: batova.ti@ips.ac.ru
119991, Moscow, Russia

T. Obukhova

Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences

Email: batova.ti@ips.ac.ru
119071, Moscow, Russia

T. Batova

Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences

Email: batova.ti@ips.ac.ru
119071, Moscow, Russia

N. Kolesnichenko

Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences

Autor responsável pela correspondência
Email: batova.ti@ips.ac.ru
119071, Moscow, Russia

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Declaração de direitos autorais © М.И. Шилина, Т.К. Обухова, Т.И. Батова, Н.В. Колесниченко, 2023