Gas phase dehydration of glycerol to acrolein: Coke on WO3/TiO2 reduces by-products

Pore Condensation in Glycerol Dehydration: Modification of a Mixed Oxide Catalyst

“…However, no significant drop in the yield could be detected for either of the samples during the run for up to 600 h. The performance of the thermally treated samples, below 1000 °C, is significantly improved with respect to the acrolein yield. The increase in acrolein yield with increasing coking, as previously reported [24,25], cannot be confirmed in this study, at least not on this timescale; perhaps this phenomenon is more of an initial change.…”

“…Further, aside from the temperature, there is a marked lower carbon formation rate with increased water and oxygen content in the feed [26]. As a curiosity, it has also recently been reported that the formation of carbon on the catalyst increase the selectivity of WO 3 /TiO 2 and heteropoly acid catalyst to acrolein [24,25].…”

“…In a previous paper by the authors [4] as well as a few available reviews [5][6][7] gives a good overview of the subject; the classes of catalysts used include: heteropoly acids and other supported inorganic acids [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], zeolites [21,[27][28][29][30][31][32][33], mixed oxides [34][35][36][37][38][39][40][41], and sulphated zirconia [42,43], all of which are solid acid materials. The acids usually contain or are promoted with P, W, S, Mo, and B, Abstract Pore condensation has been suggested as an initiator of deactivation in the dehydration of glycerol to acrolein.…”

Effect of Nb doping in WO3/ZrO2 catalysts on gas phase dehydration of glycerol to form acrolein

“…[27][28][29] Since the selectivities of Unknowns over our catalysts are quite steady as a function of TOS (3-4 h vs. 11-12 h in Table 3). It is also consistent with the nding by Dalil's group.…”

Influence of Catalyst Acid/Base Properties in Acrolein Production by Oxidative Coupling of Ethanol and Methanol

“…[5,[7][8][9][10][11][12] The acrolein production from glycerol hasn umerous advantages because glyceroli s now ubiquitous as ac o-product of the oleochemical industry and biodiesel production. [14][15][16] Thisd eactivation requires af requent regenerationo ft he catalysts, which increases Oxidativec oupling of methanola nd ethanolr epresents an ew route to produce acrolein. Following the 12 principles of green chemistry, [13] glycerold ehydration based on waste can be used for on-site/on-demand production to avoid storageand transportation of adangerousbut essential chemical compound.…”