射频等离子体改性制备S2O2-8/SnO2-Al2O3固体超强酸催化剂的研究
Preparation of S2O2-8/SnO2-Al2O3 solid superacid catalyst via radio frequency plasma modification
张旭东 1李秀兰 1朱长辉 2田保河 2朱文超2
作者信息
- 1. 四川轻化工大学机械工程学院,四川 宜宾 644005
- 2. 国民核生化灾害防护国家重点实验室,北京 102205
- 折叠
摘要
采用低温陈化法制备S2O2-8/SnO2-Al2O3 固体超强酸催化剂,利用射频等离子体技术对其进行改性后催化L-酪氨酸与甲醇的酯化反应.利用Hammett指示剂法、XRD、HRTEM、BET、FT-IR、Py-IR和NH3-TPD等对改性前后的催化剂进行表征.结果表明,经射频等离子体改性后的催化剂颗粒分散性更好、粒径更小(4.32 nm)、比表面积更大(104.4 m2/g)、总酸量更高(142.9 μmol/g).在温度为180℃、压力为1 MPa的条件下,射频等离子体改性后的催化剂催化L-酪氨酸甲酯化反应6h后L-酪氨酸甲酯产率可达92%.
Abstract
S2O2-8/SnO2-Al2O3 solid superacid catalyst is prepared through a low temperature aging method,modified by radio frequency plasma technology and used for the esterification reaction between L-tyrosine and methanol.The catalysts before and after modification are characterized by means of Hammett indicator method,XRD,HRTEM,BET,FT-IR,Py-IR and NH3-TPD.The results show that compared with the catalyst before modification,the catalyst modified by radio frequency plasma has more uniform particle distribution,smaller average particle size(4.32 nm),larger specific surface area(104.4 m2·g-1),and higher total acid content(142.9 μmol·g-1).The yield of methyl L-tyrosine reaches 92%after the esterification reaction between L-tyrosine and methanol over the S2O2-8/SnO2-Al2O3 modified by radio frequency plasma has performed for 6 h at 180℃,1 MPa.
关键词
固体超强酸/S2O2-8/SnO2-Al2O3/射频等离子体/酯化反应Key words
solid superacid/S2O2-8/SnO2-Al2O3/radio frequency plasma/esterification reaction引用本文复制引用
基金项目
四川省科技计划资助项目(2022YFG0289)
自贡市科技局重点科技计划项目(2018YYJC08)
四川轻化工大学人才引进项目(2018RCL12)
出版年
2024
NETL
NSTL
万方数据