摘要
采用不同强度酸(H_(2)SO_(4)、HCl、HNO_(3)、NH_(4)Cl、H_(3)PO_(4))对国产硅藻土DB进行酸浸改性,并用酸改性后的硅藻土为载体制备钒催化剂.采用SEM、MIP和XRD方法对改性前后硅藻土及钒催化剂进行表征分析,并用固定床反应器测定催化剂催化氧化SO_(2)活性.结果表明,酸改性使硅藻土表面杂质含量降低,比表面积、孔斜率、平均孔径均增大.改性后硅藻土为载体制备的钒催化剂V/SiO_(2)-H_(2)SO_(4)催化氧化SO_(2)转化率明显高于V/SiO_(2).这是由于V/SiO_(2)-H_(2)SO_(4)催化剂具有更大的平均孔径、孔容、比表面积以及较小的活性组分晶体尺寸.
Domestic diatomite DB was modified with different strength acids(H2 SO4,HCl,HNO_(3),NH_(4)Cl,H_(3)PO_(4)),the optimized diatomite was used as the carrier of vanadium catalyst to prepare vanadium catalyst.The diatomite and vanadium catalysts before and after modification were analyzed and characterized by SEM,MIP and XRD,and the catalytic oxidation activity of SO_(2)was determined by fixed bed reactor.The results indicated that,the acid modified diatomite DBA can increase the SiO_(2)content on the surface of diatomite carrier and reduce the impurity content on the surface,the specific surface area,pore slope and average pore diameter of diatomite DBA-1 M H_(2)SO_(4)modified by H_(2)SO_(4)were the largest,and the content of impurities on its surface was the least.The conversion rate of V/SiO_(2)-H_(2)SO_(4)catalyst for SO_(2)oxidation was significantly higher than V/SiO_(2).This was due to the larger average pore size,pore volume,specific surface area and smaller active component crystal size of V/SiO_(2)-H_(2)SO_(4)catalyst.
作者
蔡开兴
范鑫
肖海鹏
欧正芝
宋威
潘红艳
CAI Kai-xing;FAN Xin;XIAO Hai-peng;OU Zheng-zhi;SONG Wei;PAN Hong-yan(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China;Guizhou Key Laboratory for Green Chemical and Clean Energy Technology,Guiyang 550025,China)
出处
《应用化工》
CAS
CSCD
北大核心
2020年第S01期116-119,125,共5页
Applied Chemical Industry
基金
贵州省工业和信息化发展专项资金计划(H170390)
关键词
硅藻土
载体改性
钒催化剂
diatomite
carrier modification
vanadium catalyst
