A pronounced catalytic activity of heteropoly compounds supported on dealuminated USY for liquid-phase esterification of acetic acid with n-butanol

Abstract

12-Phosphotungstic acid and its cesium salts supported on a dealuminated ultra-stable Y zeolite were prepared, and showed the high catalytic activity in the liquid-phase esterification of acetic acid with n-butanol. The supported Cs 2.5 H 0.5 PW 12 O 40 catalyst gave a high conversion of n-butanol of 94.6% and a selectivity for n-butyl acetate of 100%, accompanying the high water-tolerance and catalytic reusability without regeneration.

Cs salts of 12-tungstophosphoric acid supported on dealuminated USY as catalysts for hydroisomerization of n-heptane

“…Pt/DUSY has a high BET surface area of 560 m 2 /g, and the area decreases remarkably with the increase of Cs 2.0 PW loading. For the same loading (10%) of Cs salts of PW, the BET surface area decreases with the increase of the substitute number of Cs + , which are in good agreement with the previous report [24]. Generally speaking, the supported samples still possess rather high surface areas due to the dispersion effect of the porous carrier, except for the Pt20%Cs 2.0 PW/DUSY sample, which lost the porous structure of Y zeolite in its support.…”

Synthesis, Characterization and Applications in Catalysis of Polyoxometalate/Zeolite Composites

“…The same authors also studied the synthesis of fructone-B by acetalization of ethylacetoacetate with 1,2-propanediol and observed similar results, the Cs salts being active with minimal leaching [54]. In another paper [55], they used these catalysts for the liquid-phase esterification of acetic acid with n-butanol. The conversion was higher than that observed when using the zeolite or the polyoxometalate alone.…”

“…In another paper [55], they used these catalysts for the liquid-phase esterification of acetic acid with n-butanol. The conversion was higher than that observed when using the zeolite or the polyoxometalate alone.…”

Efficient catalytic synthesis of 2-imidazolines and bis-imidazolines with silica supported tungstosilicic acid

“…These supported catalysts have been widely studied and found useful in many reactions such as the synthesis of 2,4-dihydropyrimidones, 12 metanethole , 13 α-aminonitriles 14 and esterification. 15,16 Imidazoline derivatives are of great interest and importance because of their pharmaceutical and synthetic material applications. 33 and N-tert-butoxycarbonyl-protected α-amino acids.…”