Premium
Wet oxidation of acetic acid by H 2 O 2 catalyzed by transition metal‐exchanged NaY zeolites
Author(s) -
Larachi F.,
Lévesque S.,
Sayari A.
Publication year - 1998
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(1998100)73:2<127::aid-jctb941>3.0.co;2-t
Subject(s) - oxalic acid , catalysis , acetic acid , chemistry , hydrogen peroxide , zeolite , inorganic chemistry , aqueous solution , leaching (pedology) , decomposition , transition metal , nuclear chemistry , organic chemistry , environmental science , soil science , soil water
During the wet oxidation of contaminated wastewaters, the destruction of low molecular weight carboxylic acid intermediates such as acetic, glyoxalic, and oxalic acids is often the rate‐controlling step. Oxidation of acetic acid, a very recalcitrant intermediate, requires compelling treatment severity. Heterogeneous catalytic wet oxidation of model acetic acid aqueous solutions was conducted under mild conditions (below the normal boiling point of water) using hydrogen peroxide over various transition metal‐exchanged NaY zeolites. Treatment of Cu 2+ –NaY with oxalic acid [OA] led to a catalyst, Cu 2+ –NaY [OA], with significantly improved properties in terms of total organic carbon (TOC) removal efficiency and catalyst stability against leaching. This catalyst outperformed homogeneous Cu 2+ by a factor of 2–2·5 times. Continuous feeding of H 2 O 2 reduced its undesirable decomposition. Improvement of the TOC‐degradation performance by Cu 2+ –NaY [OA] was tentatively attributed to the removal of sodium and possibly aluminium in the zeolite. © 1998 Society of Chemical Industry