CATALYTIC-OXIDATION OF GLYOXAL TO GLYOXYLIC-ACID ON PLATINUM METALS

被引：50

作者：

GALLEZOT, P ^{[1
]}

DEMESANSTOURNE, R ^{[1
]}

CHRISTIDIS, Y ^{[1
]}

MATTIODA, G ^{[1
]}

SCHOUTEETEN, A ^{[1
]}

机构：

[1] SOCIETE FRANCAISE HOECHST,CTR RECH & APPLICAT,F-93240 STAINS,FRANCE

来源：

JOURNAL OF CATALYSIS | 1992年 / 133卷 / 02期

关键词：

D O I：

10.1016/0021-9517(92)90255-G

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Aqueous solutions of glyoxylic acid (CHOCOOH) have been prepared by catalytic oxidation of aqueous glyoxal (CHOCHO) solution with air slightly above room temperature. The catalysts are carbon-supported platinum metals. Provided the pH is regulated near neutrality, the yield of glyoxylic acid (GLY) can be as high as 70% at 85.5% glyoxal conversion. GLY is subsequently oxidized quantitatively into oxalic acid. The oxidation mechanism probably involves an end-on adsorption of the glyoxal dihydrate molecule on the metal surface followed by dehydrogenation. The initial rate of GLY formation increases in the series 0 = Ru < Rh < Pd < Ir < Pt, similar to the series of the redox potentials of these elements. Ruthenium is totally inactive because it is probably covered with hydroxyl groups that catalyze side reactions such as dismutation (Cannizzaro reaction) and direct oxidation of glyoxal into formic acid (C-C bond rupture). © 1992.

引用

页码：479 / 485

页数：7