湿式氧化催化剂RuO_2/γ-Al_2O_3降解高浓度含酚配水的研究  

Catalytic Wet Air Oxidation of High Concentration Phenol Solution over RuO_2/γ-Al_2O_3 Catalyst

作　　者：杨少霞[1] 冯玉杰[1] 万家峰[1] 蔡伟民[1] 

机构地区：[1]哈尔滨工业大学市政环境学院,黑龙江哈尔滨150001

出　　处：《分子催化》2003年第5期357-361,共5页Journal of Molecular Catalysis(China)

基　　金：上海市横向课题.

摘　　要：采用浸渍法制备了RuO2/γ-Al2O3催化剂,利用XRD和SEM对催化剂进行了表征,研究了焙烧温度、反应温度、反应溶液pH值和氧分压对RuO2/γ-Al2O3催化剂活性影响.结果表明,RuO2/γ-Al2O3催化剂组分Ru在表面有较好的分散性;焙烧温度升高使RuO2晶粒长大,在低温焙烧,RuO2晶粒细小,RuO2/γ-Al2O3催化剂的活性较高;反应温度升高,使RuO2/γ-Al2O3催化剂的活性显著提高;反应溶液pH值为酸性时比在碱性条件的催化剂活性高;氧分压达到3MPa后,对于RuO2/γ-Al2O3催化剂的活性几乎没有影响.在150℃、3MPa、pH值为5.6时,反应150min后,苯酚全部被氧化.研究表明,RuO2/γ-Al2O3催化剂具有较好的催化活性.A kind of CWAO catalyst, RuO\-2/γ\|Al\-2O\-3, was prepared by dipping Al\-2O\-3 into the aqueous solution composed of RuCl3. XRD and SEM were used to determine the catalytic structure. The result showed that there is good dispersion of Ruthenium particles on the surface catalyst, and the RuO\-2 crystal size increased with increasing the calcinations temperature. Moreover, influence of the calcination temperature, reaction temperatures, the initial pH of the feed solution and oxygen pressure on the activity of the RuO\-2/γ\|Al\-2O\-3 catalyst was investigated. Results showed that the activity of the catalyst was higher when RuO\-2/γ\|Al\-2O\-3 catalyst was calcined at lower temperature of 300 ℃ for 3 h. Increasing reaction temperature, the phenol removal was obviously increased. The activity of RuO\-2/γ\|Al\-2O\-3 catalyst was higher in the acidic solution than in the alkaline solution. The activity of the catalyst did not change up to 3 MPa of the total pressure. For the RuO\-2/γ\|Al\-2O\-3 catalyst, the phenol was totally oxidized at temperature of 150 ℃, pH of 5.6 and pressure of 3 MPa after 150min. This indicated that Ru/Al\-2O\-3 catalyst has good activity.

关 键 词：苯酚氧化 Ru系催化剂 PH值 湿式氧化 

分 类 号：O643.32[理学—物理化学]