[Catalytic stability in wet air oxidation of carboxylic acids over ZnFe0.25Al1.75 O4 catalyst].
Oxalic, formic and acetic acid are main intermediate products in catalytic wet air oxidation process (CWAO). The catalytic activity and stability in CWAO of the three short-chain organic acids over ZnFe0.25Al1.75O4 catalyst were studied. Oxalic acid is the only oxidizable intermediate and the largest amount of Fe leaching is 9.5 mg L(-1) at 160 degrees C during CWAO process. Formic and acetic acid have little influence on Fe leaching. Due to the strong reducible ability of oxalic acid, the amount of Fe leaching is larger in nitrogen atmosphere than that in oxygen atmosphere. Salicylic acid can be also degraded by ZnFe0.25Al1.75O4 catalyst with a high catalytic activity and stability.
Xu
Ai-hua
AH
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. xahspinel@sina.com
Yang
Min
M
Du
Hong-zhang
HZ
Peng
Fu-yong
FY
Sun
Cheng-lin
CL
D019342:Acetic Acid / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D002384:Catalysis; D005561:Formates / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry; D015032:Zinc / Q000737:chemistry*
D002264:Carboxylic Acids; D005561:Formates; D014874:Water Pollutants, Chemical; C030544:formic acid; D007501:Iron; D015032:Zinc; D000537:Aluminum Oxide; D019342:Acetic Acid