摘要
采用不同方法制备了不同的载Ru催化剂,对催化剂表面吸附氧、Ru的分散度和晶粒大小进行了表征,测试了不同催化剂催化湿式氧化降解乙酸的活性。结果表明,不同催化剂的活性高低与其表面吸附氧含量大小排序一致。当反应温度为140℃、压力为3 MPa,Ru/ZrO_2-Ce O_2催化氧化降解乙酸,反应120 min后乙酸溶液中COD(约5 g/L)的去除率达到了99%。相比传统沉淀法,加热回流法将催化剂Ru的分散度提高了33%,COD去除率提高了54%。自由基的激发机理可能为,通过表面的-O^(2-)-Ce^(4+)-O^(2-)-Ru^(4+)-键将电子传递给催化剂表面的吸附氧,最后与水中的H^+结合形成自由基HO_2~·,完成自由基的引发过程。
Different immobilized Ru catalysts were prepared by using different methods. The catalyst surface adsorbed oxygen＇content, the dispersity and the grain size of Ru were characterized. The activities of different catalysts for the degradation of acetic acid by wet oxidation were tested. The results showed that, the activity of different catalysts were consistent with the rank of adsorbed oxygen content on the surface. When reaction temperature was 140 ℃ and pressure was 3 MPa, acetic acid was degraded by Ru/ZrO2-CeO2 catalyst oxidation, the removal rate of COD （about 5 g/L） in acetic acid solution reached 99% after 120 min reaction. The dispersity of Ru prepared by heating reflux method increased 33%, and the COD removal rate increased 54% after 120 min, compared with the case of traditional precipitation method. The excitation mechanism of free radicals might be as follows, transfers the electrons to the adsorbed oxygen on catalyst surface through --O^2-- Ce4＋- 02.- Ru^4＋- bonds. Finally, it combined the H＋ in the water to form flee radical HO2-, thus completing the initiation of free radicals.
作者
周昊
郭姣姣
胡嘉辉
王建兵
何绪文
ZHOU Hao;GUO Jiaojiao;HU Jiahui;WANG Jianbing;HE Xuwen(School of Chemical ＆ Environmental Engineering, China University of Mining ＆ Technology （Beijing）, Beijing 100083, China)
出处
《水处理技术》
CAS
CSCD
北大核心
2018年第6期34-37,41,共5页
Technology of Water Treatment
基金
国家高技术研究发展计划(863计划)资助(2015AA050501)
国家大学生创新训练项目资助(C201703325)
