第 40 卷第 4 期Vol. 40 No. 4
2010 年 8 月Aug 2010

所属栏目:医药及中间体

SO42-/TiO2-HZSM-5型固体酸催化合成尿囊素
付薪菱,许海峰,曾 明 (长沙医学院,湖南 长沙 410219)
摘 要:以固相分散法制备了用于尿囊素合成的SO42-/ TiO2-HZSM-5固体酸催化剂。考察了制备条件(HZSM-5的硅铝摩尔比、二氧化钛与HZSM-5的质量比、浸渍时间、浸渍酸浓度、焙烧温度)对催化剂结构和性能的影响。采用X-射线衍射(XRD)、氮气低温物理吸附(BET)、傅立叶红外(FT-IR)、吡啶吸附红外(Py-IR)、以及扫描电子显微镜(SEM)等技术,对所制备的催化剂的晶相结构、表面酸性位及比表面积等性能进行了表征。结果表明,催化剂的优化制备条件为:HZSM-5的硅铝比为25,m(二氧化钛)∶m(HZSM-5)=2∶1,硫酸浸渍浓度为0.5 mol/L,催化剂焙烧温度为500℃。在优化条件下,尿囊素收率为58.4%。
关键词:SO42-/TiO2-HZSM-5;固体酸;尿囊素;乙醛酸;尿素
中图分类号:TQ252.3  文献标识码:A  文章编号:1009-9212(2010)04-0046-05
Preparation of Solid Acid SO42-/ TiO2-HZSM-5 and its Application in the Synthesis of Allantoin
FU Xin-ling,XU Hai-feng ,ZENG Ming (Changsha Medical University,Changsha 410219,China)
Abstract:By means of solid-phase dispersion method,a solid acid catalyst SO42-/ TiO2-HZSM-5 for the synthesis of allantion was developed and the various factors affecting the structure and properties of the solid acid were studied. Optimized conditions were obtained as follows:the mass ratio of TiO2 to HZSM-5(Si/Al=25) 2 to 1,the concentration of H2SO4 0.5 mol/L and the calcination temperature 500℃. The crystal structure,acid center and specific surface area of the catalyst were characterized by XRD,FT-IR,Py-IR,BET and SEM. Under the optimal conditions,allantoin was obtained in 58.4% yield.
Key words:SO42-/TiO2-HZSM-5;solid acid;allantoin;glyoxylic acid;urea
作者简介:付薪菱(1982-),女,四川攀枝花人,讲师,硕士,研究方向:催化绿色化学。(E-mail:fuxinling1982220@yahoo.com.cn)
收稿日期:2010-06-06