Vapour phase dehydration of glycerol to acrolein over tungstated zirconia catalysts

Dehydration of glycerin to acrolein over H 3 PW 12 O 40 heteropolyacid catalyst supported on silica-alumina

“…It should be noted that yield for acrolein increased with increasing Brønsted acidity of the catalysts. This result was well consistent with the result of previous works [31][32][33] in a sense that Brønsted acid sites strongly affected the acrolein formation in the dehydration of glycerin. In case of Brønsted acid sites, migration of proton from the catalyst to internal oxygen of glycerin is facile due to the absence of steric effect.…”

Effect of Alcohol Structure on the Kinetics of Etherification and Dehydration over Tungstated Zirconia

“…From the XRD pattern in Figure 1a,t he peaks at 2q angles of 30, 35, 50, and 598 (yellow) indicatet he presence of tetragonal zirconia, [30][31][32] and the peaks between 23-258 (pink) represent the presence of bulk tungsten oxide. From the XRD pattern in Figure 1a,t he peaks at 2q angles of 30, 35, 50, and 598 (yellow) indicatet he presence of tetragonal zirconia, [30][31][32] and the peaks between 23-258 (pink) represent the presence of bulk tungsten oxide.…”

High-efficiency catalytic performance over mesoporous Ni/beta zeolite for the synthesis of quinoline from glycerol and aniline

“…On one hand, in the former step, the strength and type of acid sites on solid acid catalyst perform a crucial function in formation of intermediate acrolein. For instance, Brønsted acid sites (especially weak/ moderately Brønsted acid sites) were effective active and selective sites of acrolein, 37,[61][62][63][64] whereas strong Brønsted acid sites readily result in acrolein polymerization simultaneously. 65 Contrarily, Lewis acid sites could catalyze glycerol dehydration to produce hydroxyacetone.…”