[Catalytic wet air oxidation of phenol with Ru/ZrO2-CeO2 catalyst].
Wet air oxidation of phenol with Ru/ZrO2-CeO2 was systematically investigated and results showed that Ru/ZrO2-CeO2 could significantly increase the removal of COD and phenol. At the reaction temperature of 170 degrees C and pressure of 3MPa, about 99% COD and 100% phenol was removed respectively after 120 min. The optimal conditions were: reaction temperature, 170 degrees C; reaction pressure, 3 MPa; catalyst dosage, 5 g/L; agitator speed, 500 r/min. By analyzing intermediates, a simplified scheme of phenol oxidation was brought out. It includes two main steps. The first step is the production of organic acids, which is fast. The second step is the oxidation of organic acid, in which the oxidation of acetic acid is slow. Complete oxidation of acetic acid needs high temperature at which the radicals assault the C-H bond of a carbon and acetic acid is oxidized into carbon dioxide and water through formic acid.
Wang
Jian-bing
JB
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
Zhu
Wan-peng
WP
Wang
Wei
W
Yang
Shao-xia
SX
D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D010084:Oxidation-Reduction; D019800:Phenol / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D015040:Zirconium / Q000737:chemistry*
D002563:Cerium; D019800:Phenol; C030583:ceric oxide; D012428:Ruthenium; D015040:Zirconium; C028541:zirconium oxide