水热温度对改性活性炭制Pd/AC催化剂性能的影响  

Effect of hydrothermal treatment of activated carbon by different hydrothermal reaction temperature on activity of Pd/AC catalysts

作　　者：徐健 王琪 陈亚中 崔鹏 XU Jian;WANG Qi;CHEN Yazhong;CUI Peng(School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2018年第9期1267-1273,共7页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(21106027)

摘　　要：文章采用水热硝酸氧化法对活性炭表面基团进行处理,考察了水热温度对活性炭的孔结构、表面含氧基团的影响,对催化剂进行了一系列表征,并评价了Pd/AC催化剂催化甲酸分解的性能。结果表明,随着水热温度的提高,活性炭上含氧基团先增加后减少,水热温度过高会破坏活性炭孔结构,使Pd粒子尺寸先减小后增大,同时催化剂活性先升高后降低。硝酸浓度为1.0mol/L,水热4h,水热温度为150℃时,催化活性最好;在甲酸浓度为0.01mol/L,90℃反应1h情况下,催化甲酸分解率达到92.2%。The influence of hydrothermal reaction temperature on the pore structure and surface oxygen functional groups(SOFGs)of activated carbon was investigated with the treatment of surface functional groups of activated carbon by hydrothermal nitric acid oxidation.The catalytic activity of Pd/AC catalysts was characterized by N 2 physisorption,NH 3-TPD,FTIR,TG,XPS and TEM.And the performance of Pd/AC catalysts for formic acid decomposition was evaluated.The results indicated that the porous texture of carbon support almost kept unchanged with low temperature treatment,while it would be destroyed at high hydrothermal reaction temperature.With the increase of temperature,the Pd particle size first decreased and then increased,while the amount of SOFGs first increased and then decreased,and the catalytic activity of Pd/AC catalysts first increased and then decreased.The optimal conditions of hydrothermal treatment were as follows:the HNO 3 concentration was 1.0 mol/L,hydrothermal reaction temperature was 150℃and hydrothermal reaction time was 4 h.When the formic acid concentration was 0.01 mol/L,reaction temperature was 90℃and reaction time was 1 h,the formic acid decomposition rate reached 92.2%.

关 键 词：活性炭 水热温度 硝酸 Pd/AC催化剂 

分 类 号：O643.361[理学—物理化学]