SYNTHESIS OF A LOW-TEMPERATURE CONVERSION CATALYST OF CARBON MONOXIDE IN AMMONIA PRODUCTION

  • Alexander A. Il'in Ivanovo State University of Chemistry and Technology
  • Ksenia A. Veres Ivanovo State University of Chemistry and Technology
  • Tatiana V. Ivanova Ivanovo State University of Chemistry and Technology
  • Mikael B. Seioum Ivanovo State University of Chemistry and Technology
  • Alexander P. Ilyin Ivanovo State University of Chemistry and Technology
DOI: https://doi.org/10.6060/ivkkt.20216410.6503
Keywords: conversion of carbon monoxide, copper-zinc-aluminum catalyst, oxalate

Abstract

The processes of preparation of copper-zinc-aluminum catalyst for low-temperature conversion of carbon monoxide with water vapor in the production of ammonia have been investigated. It is proposed to use metal powders of copper and zinc, which were pretreated in oxalic acid solutions using ultrasonic treatment, to obtain a catalyst. It was established by X-ray phase analysis that during the ultrasonic treatment of copper and zinc powders in a solution of oxalic acid, hydrated oxalates of copper and zinc are formed. The temperature range of decomposition of a mixture of copper and zinc oxalates is significantly less than the decomposition of individual oxalates and is 290-360 ° C, which indicates the possibility of cationic isomorphism and the formation of a solid solution of the CuxZn1-xC2O4 ∙yH2O type at the stage of heat treatment. Synchronous thermal analysis data indicates the presence of endo- and exothermic heat effects that accompany the calcination process. It has been shown that endothermic effects are due to the removal of water and the release of carbon monoxide, while exothermic effects are associated with the oxidation of carbon monoxide to dioxide and metal oxidation. The process of conversion of carbon monoxide with the formation of CO2 and H2 is also possible. The temperature range and composition of the gas phase formed during the heat treatment of copper and zinc oxalates were determined by mass spectrometry. It has been proven that copper and zinc oxides can be partially reduced during the thermolysis of oxalates by gases that are released during calcination. The obtained oxides of copper and zinc are characterized by a high specific surface area, which is 60 and 80 m2/g, respectively. The catalyst obtained by oxalate technology is not inferior in its characteristics to industrial analogs. The CO conversion is 92% at an operating temperature of 220 °C, the specific surface area is 98 m2/g.

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Published
2021-09-22
How to Cite
Il’in, A. A., Veres, K. A., Ivanova, T. V., Seioum, M. B., & Ilyin, A. P. (2021). SYNTHESIS OF A LOW-TEMPERATURE CONVERSION CATALYST OF CARBON MONOXIDE IN AMMONIA PRODUCTION. ChemChemTech, 64(10), 91-97. https://doi.org/10.6060/ivkkt.20216410.6503
Issue
Vol 64 No 10 (2021)
Section
CHEMICAL TECHNOLOGY (inorganic and organic substances. Theoretical fundamentals)

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