摘要
对CeY分子筛用等体积浸渍法制备了不同Ce浸渍量的吸附剂Ce-CeY。用XRD、氮吸附实验和FT-IR技术对不同吸附剂晶体结构及噻吩吸附行为进行了研究。结果表明,CeY分子筛中,Ce(Ⅳ)提供了丰富的吸附活性位,可以和噻吩形成π络合、S-Ce键配合及氢键作用;浸渍的Ce生成CeO2,分散在分子筛孔道内壁,使Ce-CeY孔径缩小,对噻吩具有分子尺寸选择作用。随着Ce浸渍量的增加,吸附剂的孔径逐渐缩小,吸附剂选择吸附噻吩性能先增大后减小。当温度为30℃、8.5%Ce-CeY(g)/模拟液(mL)为1/14、吸附时间为120min时,噻吩脱除率接近100%。
The absorbent Ce-CeY with different Ce impregnation amounts is prepared with isometric impregnation method for CeY molecular sieve. The different kinds of adsorbent crystal structures and adsorption behavior of thiophen are studied by XRD, nitrogen adsorption experiment and PT-IR technology. The results show that in the CeY molecular sieve, Ce （IV） provides rich adsorption active site for adsorption and can form π complexation, S-Ce bond forms into CeO2 and disperses on the inner linkage and hydrogen bonding with thiophen; impregnated Ce wall of molecular sieve holes to make Ce-CeY hole diameter reduce, which has the selectivee-function of molecular size for thiophen. With the increase of Ce impregnation amount, the hole diameter of adsorbent is reduced gradually and the property of selectively adsorbing thiophen of adsorbent is increased first and decreased later. When temperature is 30~C, the analog solution （mL） of 8.5% Ce-CeY （g） is 1/14 and adsorption time is 120 minutes, the removal rate of thiophen is near 100%.
出处
《燃料与化工》
2012年第1期48-52,共5页
Fuel & Chemical Processes
基金
高等学校博士学科点专项科研基金资助项目(20080488000)
关键词
噻吩
焦化粗苯
选择吸附
CeY分子筛
等体积浸渍
Thiophen Coking crude benzol Isometric impregnation Selective adsorption CeY molecular sieve
