Zr- and La-containing Catalysts in Synthesis of Methanol and Dimethyl Ether.

Autor:	Kipnis, M. A., Kosolapova, A. P., Belostotskii, I. A., Volnina, E. A., Bondarenko, G. N., Levin, I. S., Ponomarev, A. B.
Předmět:	METHYL ether CATALYST synthesis ZIRCONIUM oxide METHANOL REFLECTANCE spectroscopy ETHER synthesis
Zdroj:	Russian Journal of Applied Chemistry; Aug2019, Vol. 92 Issue 8, p1084-1093, 10p
Abstrakt:	Zirconium oxide samples synthesized and modified with Al, Si, W oxides were studied as dehydrating components of bifunctional catalysts for synthesis of dimethyl ether. ZrO2 modified with Al and Si oxides is inactive in the dehydration of methanol, but its dehydrating activity becomes comparable with the activity of γ-Al2O3 upon introduction of WO3. According to the data on methanol adsorption at 46°C, the adsorption capacity of ZrO2 modified with SiO2 is comparable with the capacity of γ-Al2O3, and that of ZrO2 modified with WO3 is four times lower. The difference in the catalytic and adsorption behavior of the samples is accounted for by the data of in situ high-temperature diffuse reflection IR spectroscopy. A high content of weak Brønsted acid centers is observed on the ZrO2 surface, with the interaction of these with methanol resulting in the methoxylation of the catalyst surface. When W oxide is deposited onto zirconium oxide, the surface has strong Brønsted centers involved in the reaction of methanol dehydration. A coprecipitation from solution of nitrate salts of Cu, Zn, La with Na carbonate, followed by the procedures of filtration, washing, and thermal treatment, yielded a catalyst for synthesis of methanol, the activity of which is close to that of the industrial catalyst. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
Externí odkaz:	Zobrazit plný text záznamu Full text from SpringerLink