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Kinetic modeling of Pt/C catalyzed aqueous phase glycerol conversion with in situ formed hydrogen
Author(s) -
Jin Xin,
Subramaniam Bala,
Chaudhari Raghunath V.,
Thapa Prem S.
Publication year - 2016
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15114
Subject(s) - dehydrogenation , hydrogenolysis , chemistry , catalysis , hydrogen , activation energy , glycerol , aqueous solution , reaction mechanism , inorganic chemistry , organic chemistry
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 130–160°C. Six different kinetic models were evaluated to describe the competing dehydrogenation, hydrogenolysis, dehydration, and CC 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 CC and CO cleavage best describes the experimental data. The dehydrogenation reaction proceeds with a significantly lower activation barrier (E a = 53 kJ/mol) compared with the noncatalytic hydrothermal conversion (E a = 128 kJ/mol). The activation energy for glycerol hydrogenolysis on Pt/C catalyst without adding hydrogen is estimated to be 64 kJ/mol. © 2015 American Institute of Chemical Engineers AIChE J , 62: 1162–1173, 2016