CATALYTIC SYNTHESIS OF DIMETHYLPHYR FROM CARBON MONOXIDE
Journal Title: International scientific journal Science and Innovation - Year 2024, Vol 3, Issue 9
Abstract
Currently, it is relevant to obtain dimethyl ether from synthesis gas in one step. In the work, the influence of various factors on the process of direct synthesis of dimethyl ether from syngas in one step was studied in Cu2O*ZnO*ZrO2/YuKTs catalyst. As a result of studies conducted on the effect of various factors on the production of target products in the process of obtaining dimethyl ether from synthesis gas, it was found that increasing the ratio of moles of pressure, temperature, and the mole ratio of hydrogen to greenhouse gas leads to an increase in greenhouse gas conversion due to the fact that the direct synthesis reaction of dimethyl ether from synthesis gas prevails. An increase in the volume velocity reduces the conversion of the carbon monoxide, because the reaction between the reactants in the gas phase and the methanol catalyst surface does not have time to occur due to the low contact time. It has been proven that the increase in the ratio of gas to hydrogen moles leads to an increase in the yield of dimethyl ether and the conversion of gas. As a result of the research, the following optimal conditions for obtaining dimethyl ether from carbon dioxide and hydrogen in one step were determined: R=1 MPa, T=300℃, hydrogen:carbon gas=2, volume velocity 1000 hour-1. In this case, the conversion of exhaust gas does not decrease for 220 hours. At the same time, the physico-chemical and textural characteristics of the Cu2O*ZnO*ZrO2/ЮКЦ catalyst were studied. The acidity of the Cu2O*ZnO*ZrO2/ЮКЦ catalyst surface was determined by the method of thermoprogrammed desorption of ammonia. Acidity value for Cu2O*ZnO*ZrO2/ЮКЦ was 0.065 mmol NH3/gkat. The calculated value of acidity of YuKTs was 0.26 mmol NH3/gkat. When Lewis acid centers (Lewis acidity center) were determined in the presence of Cu2O*ZnO*ZrO2/ЮКЦ primary catalyst by IR-spectroscopy method, it was found that the concentration of Lewis acidity center was 49 μmol/g. The amount of Brønsted acidity centers is 56 μmol/g of the total concentration of acidity centers. The purpose of the work is to study the kinetic laws of the synthesis reaction of dimethyl ether from synthesis gas in one step and the textural characteristics of the catalyst.
Authors and Affiliations
Faizullaev N. I. , Rakhmatov Kh. B. , Rakhmonkulov M. T. , Safarov M. Dj. , Matmuratov Sh. S.
Keywords
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- EP ID EP747903
- DOI 10.5281/zenodo.13878915
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