摘要
通过比表面积、热失重、红外光谱等分析方法,进行了Zr(OH)_4低温干燥350℃烧结对失水、比表面积、浸渍硫酸时锆的损失变化的研究。证实样品低温干燥失水转化ZrO_2,干燥时间与失水量、比表面积的大小成正比,与锆的损失成反比。样品经过350℃、3 h烧结,其比表面积、失水转化成的ZrO_2的量显著增加,失锆量降低。将两种条件制备的ZrO_2/SO_4^(2-)代替硫酸用于净化粗苯,以检验其催化活性。实验表明:两种方法制备的催化剂用于苯净化反应时苯乙烯的转化率有明显差异,采用350℃、3 h烧结的样品浸渍硫酸得到的催化剂,苯乙烯的转化率达50％以上。本研究为固体超强酸的应用开拓了新的领域。
In the paper,loss of water,specific surface area,loss of Zirconium when Zr(OH)4 soaked in sulphuric acid were studied by analysis of specific surface area,TG,IR spectrum. When sample of Zr(OH)4 was dried in low temperature and roasted at 350t for 3 hours.It was showed that Zr(OH)4 lost water and changed into ZrO2 when Zr(OH)4 was dried in low temperature, the amount of the loss of water and the specific surface area were in direct proportion to dry time and the loss of Zirconium was in inverse proportion to dry time. It was found that the amount of ZrO2 and the specific surface area increased and the loss of Zirconium decreased when Zr(OH)4 was roasted at 350℃ for 3 hours.In this article,two catalysts, one dried in low temperature and the other roasted at 350℃ for 3 hours, replaced sulphuric acid to purify crube benzene in order to test their activity.It was proved this catalyst,which sample roasted at 350℃ for 3 hours,raised the styrene changing ratio to 50 % . This study expanded a new application field for solid superacid catalyst.
出处
《化工时刊》
CAS
2003年第8期14-17,共4页
Chemical Industry Times
基金
上海市教委基金(02HK06)
