负载型湿式氧化催化剂RuO_2/γ-Al_2O_3活性与稳定性

ACTIVITY AND STABILITY OF RuO_2/γ-Al_2O_3 CATALYST IN WET AIR OXIDATION

采用浸渍法制备了RuO2 /γ Al2 O3 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 Al2 O3 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 Al2 O3 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 Al2 O3 催化剂组分的溶出 。

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.