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Synthesis and Properties of Catalytic Chemisorbents Based on Zinc Oxide Doped with Transition MetalsAfineevskii, A. V.; Prozorov, D. A.; Smirnov, D. V.; Smirnov, E. P.; Gordina, N. E.; Rumyantsev, R. N.; Osadchaya, T. Yu; Nikitin, K. A.
Russian journal of general chemistry, 06/2023, Letnik: 93, Številka: 6Journal Article
Synthesis of a molded adsorbent (MA) based on zinc oxide doped with oxides of transition metals (cobalt, copper, magnesium, titanium) was considered. The influence of these dopants on the physical properties and performance of the MA was shown. The role of the amount of the dopant in the specific surface area and porosity of the MA was evaluated, and the effect of transition metal oxide dopants on its surface morphology and strength was demonstrated. The chemisorption capacity of the oxide systems synthesized toward carbon disulfide was experimentally determined. The influence of carbon disulfide chemisorption on the surface morphology, as well as on the strength properties of the MA, was investigated. Using thiophene as a model hydrogen acceptor, the activity of the MA in the destructive reduction of organosulfur compounds was examined. The selectivity of thiophene hydrogenation to 2,3-dihydrothiophene in the temperature range from 350 to 410°C was shown. The optimal temperature of thiophene reduction was found to be 390°C, irrespective of the dopant amount. Using gas chromatography, the chemical composition of the hydrogenate was determined, and the complex dependence of its composition on the nature of the doped oxide was shown. It was demonstrated that doping with small amounts (up to 1.5 wt %) of cobalt and copper oxides provides for significant catalytic ability of the MA in the thiophene reduction reaction and that doping with 0.5 wt % titanium and magnesium oxides affords improvement of the strength properties of the MA. Use of aqueous ammonia solutions of various concentrations for the charge preparation did not noticeably affect the strength characteristics of the MA. The increments in the strength of the MA after the desulfurization process were estimated. It was shown that the MA operation has little effect on its morphology and crystallinity.
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