One-step glycerol oxidehydration to acrylic acid on multifunctional zeolite catalysts

Glycerol dehydration catalyzed by MWW zeolites and the changes in the catalyst deactivation caused by porosity modification

“…7). The same behavior and signature of coke derived from glycerol conversion was detected in a previous publication [34].…”

“…This type of coke is more damaging for zeolites performance because the micropores are blocked with coke and obstructing the internal active sites causing a loss in conversion as sketched in Scheme 1. In contrast, the steps of polybranched ether molecules development involved the intermolecular dehydration of glycerol molecules activated on adjacent acid sites, followed by the successive coupling of hydroxyl groups of glycerol [34,35]. The formation of polyglycol molecules involved the transport of bulky polycondensed molecules, and, therefore occurred favorably on the external surfaces of the zeolites crystals, mainly in exposed sheets of modified zeolites noticeable in 13 C NMR.…”

“…In a preceding study [34] the suggested steps of polyaromatic accumulation involved the establishment of highly active monomeric species during the glycerol dehydration, followed by their transport and oligomerization inside the zeolite pores. This type of coke is more damaging for zeolites performance because the micropores are blocked with coke and obstructing the internal active sites causing a loss in conversion as sketched in Scheme 1.…”

Structure–Reactivity Correlations in Vanadium‐Containing Catalysts for One‐Pot Glycerol Oxidehydration to Acrylic Acid

“…However,t he design of multifunctionala cida nd redox catalysts for the dehydration of glycerola nd the partial oxidation of acrolein is am ajor challenge. [16][17][18][19] Nonetheless, other systemsh aves hown promising results, such as V-dopedz eolites [20,21] and V-Poxides. After these first studies, catalystsr elatedt ot he family of perovskites greatly improved the AA yields, up to 28 %; [14,15] nevertheless, both the productivities and the overall catalytic performance remainedu nsatisfactory.I nt he last few years, many efforts have been made to improve the performance of catalysts for the one-pot oxidehydration of glycerol to AA.…”

Liquid–liquid phase equilibria of the quaternary system {water (1)+acrylic acid (2)+acetic acid (3)+cyclopentyl methyl ether (4)}: Measurement, correlation, and comparative study

“…At present, the commercial production of AA through gas-phase catalytic oxidation of propylene and/or acrolein is a mature, widely practiced and competitive industrial process in the world [7,8]. To reduce the cost of production, many manufactures have improved or are improving this production technique for AA with respect to the improvement of catalytic performance and optimization of purification technology [9][10][11]. The crude aqueous solution of AA obtained by the method of catalytic oxidation of propylene contains, in addition to AA, co-products such as acetic acid, formic acid, alkane acid, acrolein, and acetaldehyde.…”