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Liquid Phase, Aerobic Oxidation of Benzyl Alcohol over the Catalyst System (Pt/TiO 2 +H 2 O)
Author(s) -
Kunene Avela,
Heerden Tracey,
Gambu Thobani G.,
Steen Eric
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202000759
Subject(s) - benzyl alcohol , catalysis , phase (matter) , chemistry , alcohol , alcohol oxidation , kinetics , reaction rate , liquid phase , inorganic chemistry , chemical engineering , organic chemistry , thermodynamics , physics , quantum mechanics , engineering
Up to four different phases can be present in the heterogeneously catalyzed, liquid phase, aerobic oxidation of benzyl alcohol over Pt/TiO 2 . It is shown that the rate of benzyl alcohol oxidation is greatly enhanced upon addition of water to the initial reaction mixture but is not affected by the split between the two liquid phases. The rate of reaction correlates with the composition of water in the phase associated with the catalyst, i. e. the water‐poor phase. Water may have various kinetic effects, e. g. a change in the distribution of surface species. It is argued on grounds of thermodynamic consistency that the liquid phase surrounding the catalyst is an intricate part of the catalyst in the aerobic benzyl alcohol oxidation over Pt/TiO 2 ; water present in this liquid phase interacts with species on the surface altering the reaction kinetics.