Dehydration of 1,2-propanediol to propionaldehyde over zeolite catalysts

Zhang, Dazhi; Barri, Sami A. I.; Chadwick, David

doi:10.1016/j.apcata.2011.04.028

Cited by 35 publications

(38 citation statements)

References 42 publications

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“…Interestingly, 2‐PrOH (2‐propanol) rather than 1‐PrOH (1‐propanol) is found to be the main product from 1,2‐PDO decomposition. The formation of 1‐PrOH is believed to follow E 2 elimination of 1,2‐PDO involving β and γ carbons (dehydration and hydrogenation, shown in Scheme ) . However, this is not true in this case.…”

Section: Resultsmentioning

confidence: 88%

Kinetic modeling of Pt/C catalyzed aqueous phase glycerol conversion with in situ formed hydrogen

et al. 2015

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Detailed kinetic modeling of Pt/C catalyzed conversion of glycerol to lactic acid, glycols, and alcohols with in situ formed hydrogen is reported. Experimental concentration-time profiles were obtained in a batch slurry reactor at different glycerol concentrations, nitrogen partial pressures, and NaOH concentrations in a temperature range of 130-1608C. Six different kinetic models were evaluated to describe the competing dehydrogenation, hydrogenolysis, dehydration, and CAC cleavage reactions, and discriminated to fit the experimental data. It is found that a "dual-similar-site" mechanism involving alkali promoted dehydrogenation, on two adjacent Pt sites to affect CAC and CAO cleavage best describes the experimental data. The dehydrogenation reaction proceeds with a significantly lower activation barrier (E a 5 53 kJ/mol) compared with the noncatalytic hydrothermal conversion (E a 5 128 kJ/mol). The activation energy for glycerol hydrogenolysis on Pt/C catalyst without adding hydrogen is estimated to be 64 kJ/mol. a Rate/adsorption constants with 95% confidence level b Rate constant unit: m 3 /kg cat.h. c Unit of E a and DH: kJ/mol. d Sensitivity analysis procedures in Supporting Information Table S4-1, unit: kJ/mol. Scheme 6. Energy diagram of tandem catalysis vs. hydrothermal and conventional hydrogenolysis reactions (left: hydrothermal conversion vs. catalytic dehydrogenation; right: hydrogenolysis with external H 2 vs. with in situ H 2 ).

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Section: Resultsmentioning

confidence: 88%

Kinetic modeling of Pt/C catalyzed aqueous phase glycerol conversion with in situ formed hydrogen

et al. 2015

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“…For example, in the dehydration of 1,2-propanediol into propanal, the propanal selectivity exceeds 90% with a completed conversion over strong acidic catalysts such as silica-supported silicotungstic acid [24] and ZSM-23 [25], whereas they are rapidly deactivated with time on stream. In the dehydration of 1,2-propanediol into propanal, silica-supported WO 3 catalyst, which has weak acidic property, shows a stable propanal selectivity of 93.5% at 250 • C when 1,2-propanediol is diluted by 80 wt.% water, but it is also deactivated gradually when pure 1,2-propanediol is used as the reactant [26].…”

Section: Cyclodehydration Of Deg Over Solid Acid Catalystsmentioning

confidence: 97%

Cyclodehydration of diethylene glycol over Ag-modified Al2O3 catalyst

Sun

Wang

Yamada

et al. 2015

Applied Catalysis A: General

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“…Because of the availability of 1,2-PDO from glycerol, several research groups investigated the conversion of 1,2-PDO to form 1-PO [43][44][45] and propanal (PA) [46][47][48][49]. In the hydrogenolysis of 1,2-PDO using iridium complex catalyst, Foskey et al reported that the presence of water in the reaction mixture gave improved selectivity to 1-PO, and that a 95% yield of 1-PO was achieved at 125 • C and 0.7 MPa [45].…”

Section: Introductionmentioning

confidence: 99%