摘要
采用水热硝酸氧化法对活性炭表面基团进行处理,考查了硝酸浓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N_2物理吸附、NH_3-TPD、FTIR、TEM等表征,并评价Pd/AC催化剂催化甲酸分解的性能。结果表明,随着硝酸浓度的提高,活性炭上含氧基团增加,浓度过高会破坏活性炭孔结构,使负载Pd粒子尺寸有所增大,催化剂活性降低。当活性炭在硝酸浓度为1.0 mol·L^(-1),150℃下水热处理4h,负载Pd催化剂的催化活性最好,在甲酸浓度为0.01 mol·L^(-1),90℃反应1 h情况下,甲酸分解率达到92.22%。
The influence of HNO3 concentration on the support structure,surface oxygenated functional groups（SOFGs）was investigated by N2 physisorption,NH3-TPD,FT-IR and TEM. And the catalytic performance of Pd/AC catalyst was evaluated by the decomposition of formic acid. The results indicated that the amount of SOFGs,activity depend strongly on the HNO3 concentration in the hydrothermal treatment. The porous texture of carbon support almost keep unchanged with low HNO3 concentrations（≤1.5 mol·L^（-1）） treatment,while it decreases significantly at high acid concentrations（2.0 mol·L^（-1））.However,the amount of SOFGs increases with the concentration of nitric acid as well as the Pd particle size. The optimal concentration of HNO3 is 1.0 mol·L^（-1）. The decomposition of formic acid on Pd/AC catalyst is as high as 92.22% at 90℃ for 1 h.
作者
徐健
王辰
杨涛
王琪
XUJian;WANG Chen;YANG Too;WANG Qi(School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009＋ C hina;Sucheng No.1 Middle School of Anhui Province,Suzhou 234000 China)
出处
《安徽化工》
CAS
2018年第3期32-36,共5页
Anhui Chemical Industry
关键词
硝酸
水热处理
活性炭
钯炭催化剂
nitric acid
hydrothermal treatment
activated carbon
Pd/AC catalyst
