李贵贤,李延伟,李晗旭,祁建军,张军强,董鹏.VOx/SiO2-Al2O3催化剂催化苯羟基化制苯酚[J].分子催化编辑部,2021,35(5):440-448
VOx/SiO2-Al2O3催化剂催化苯羟基化制苯酚
Catalytic Hydroxylation of Benzene to Phenol with VOx/SiO2-Al2O3 Catalyst
投稿时间:2021-07-20  修订日期:2021-08-22
DOI:10.16084/j.issn1001-3555.2021.05.005
中文关键词:  VOx/SiO2-Al2O3催化剂    苯酚  羟基化
英文关键词:VOx/SiO2-Al2O3 catalyst  benzene  phenol  hydroxylation
基金项目:甘肃省科技计划项目(20JR10RA190)
作者单位E-mail
李贵贤 兰州理工大学 石油化工学院, 甘肃 兰州 730050  
李延伟 兰州理工大学 石油化工学院, 甘肃 兰州 730050  
李晗旭 兰州理工大学 石油化工学院, 甘肃 兰州 730050  
祁建军 兰州理工大学 石油化工学院, 甘肃 兰州 730050  
张军强 兰州理工大学 石油化工学院, 甘肃 兰州 730050  
董鹏 兰州理工大学 石油化工学院, 甘肃 兰州 730050 dongpeng06190318@126.com 
摘要点击次数: 0
全文下载次数: 0
中文摘要:
      以硅溶胶和偏铝酸钠合成的SiO2-Al2O3复合氧化物作为载体,并采用水热合成法合成了VOx/SiO2-Al2O3催化剂.采用XRD、SEM、TEM、XPS、NH3-TPD、N2物理吸/脱附等技术对样品进行了表征.由XRD、SEM和TEM表征结果可知,活性中心钒能够被均匀分散于SiO2-Al2O3复合氧化物的表面;由XPS及NH3-TPD表征发现,当钒的含量为4%时催化剂中V4+含量最大且总酸量相对适中.探究了VOx/SiO2-Al2O3催化剂对苯羟基化制苯酚反应的催化性能,结果表明:相对于其他催化剂,由于4% VOx/SiO2-Al2O3催化剂拥有高分散活性中心、最大的V4+含量及适中的载体酸性环境等微观结构而表现出良好的催化性能,苯转化率为48.1%,苯酚选择性为99.6%.
英文摘要:
      SiO2-Al2O3 composite oxide was synthesized by silica sol and sodium metaluminate and VOx/SiO2-Al2O3 catalyst was synthesized by hydrothermal method using SiO2-Al2O3 composite oxide as support. The samples were characterized by XRD, SEM, TEM, XPS, NH3-TPD and N2 physical adsorption/desorption. The results of XRD, SEM and TEM showed that the active center vanadium was highly dispersed on the surface of SiO2-Al2O3 composite oxide. By XPS and NH3-TPD characterization, it was found that when the content of vanadium was 4%, the content of V4+ in the catalyst reached the maximum and the total acid content was relatively moderate. The catalytic performance of VOx/SiO2-Al2O3 catalyst for hydroxylation of benzene to phenol was investigated. Compared with other catalysts, the results showed that the 4%VOx/SiO2-Al2O3 catalyst showed good catalytic performance, that is, the conversion of benzene was 48.1% and the selectivity of phenol was 99.6%, which was based on a high dispersed active center, the largest content of V4+ and moderate acidic environment of the carrier in 4%VOx/SiO2-Al2O3 catalyst.
HTML  查看全文  查看/发表评论  下载PDF阅读器