负载型湿式氧化催化剂RuO2/γ-Al2O3活性与稳定性

采用浸渍法制备了RuO₂/γ-Al₂O₃催化剂，以苯酚为目标有机物重点研究了进水pH值和温度对RuO₂/γ-Al₂O₃催化剂组分溶出和活性的影响.结果表明，催化剂在降解苯酚过程中存在着组分溶出现象，随着进水溶液pH值降低催化剂组分溶出量增加，且在进水为酸性时苯酚去除率高于碱性时的去除率.反应温度升高，催化剂组分溶出量降低，苯酚去除率增加.采用在负载型RuO₂/γ-Al₂O₃催化剂中掺杂Ce和Zr的方法对抑制催化剂组分溶出进行了初步研究，发现掺杂Ce和Zr后有效地降低了RuO₂/γ-Al₂O₃催化剂组分的溶出，且提高了催化剂的活性.

ACTIVITY AND STABILITY OF RuO2/γ-Al2O3 CATALYST IN WET AIR OXIDATION

A kind of CWAO catalyst, RuO₂/γ-Al₂O₃, was prepared by dipping Al₂O₃ into aqueous solution composed of RuCl₃. Taking phenol as organic substrate,the influences of the initial pH of the feed solution and degradation temperatures on the stability and the activity of RuO₂/γ-Al₂O₃ catalyst were investigated. Results showed that leaching of Ru and Al existed in the process of CWAO of phenol and the amount of leached Ru and Al increased with decreasing initial pH of the feed solution, but phenol removal was higher in the acidic feed solution than that in the alkaline feed solution. The amount of leached Ru and Al decreased and phenol removal was higher with increasing degradation temperature. The influences of Ce and Zr added to RuO₂/γ-Al₂O₃ catalyst on the stability and the activity of the catalyst were also studied. The result showed that doping of Ce and Zr into RuO₂/γ-Al₂O₃ catalyst can promote the stability and activity of the catalyst prepared.