Hβ分子筛表面改性对香叶基丙酮香料吸附力的影响  

EFFECTS OF SURFACE MODIFICATION BY H_2 REDUCTION ON GERANYL ACETONE ADSORPTION AND DESORPTION OF MODIFIED Hβ ZEOTILES

作　　者：何嘉杰[1] 朱保昆 吴家灿 刘娟 黄艳 李忠[1] 

机构地区：[1]华南理工大学化学与化工学院,广州510640 [2]云南中烟工业有限责任公司技术中心,昆明650202 [3]广州华芳烟用香精有限公司,广州510385

出　　处：《离子交换与吸附》2017年第5期463-471,共9页Ion Exchange and Adsorption

基　　金：烟草行业卷烟调香技术重点实验室开放课题基金(TX2014007)

摘　　要：应用H_2还原法对Hβ分子筛进行表面还原改性,并应用XRD、红外光谱和Boehm测定法对材料进行表征,应用程序升温脱附技术(TPD)测定香叶基丙酮在改性前后Hβ分子筛上的脱附曲线,讨论了Hβ分子筛表面化学性质对其吸附香叶基丙酮的吸附和脱附性能的影响。研究结果表明,对Hβ分子筛进行H_2还原表面改性,可保持其原始的晶体结构不变,同时又能在保持其表面总酸性基团浓度基本不变的前提下,大幅降低其表面的强酸性基团的浓度。TPD实验显示,原始的Hβ分子筛表面存在两种吸附香叶基丙酮的活性位,经H_2还原表面处理后所得到的改性Hβ分子筛其表面仅存在对香叶基丙酮吸附力较弱的吸附活性位,从而有效地提高香叶基丙酮的脱附性能。In this work, the effects of surface modification by H2 reduction on Geranyl acetone adsorption and desorption properties of the modified Hfl zeotiles were investigated. Hfl zeotiles were modified by 1-12 reduction method, and then were characterized by XRD, FT-IR and Boehm titration method. TPD （Temperature Programmed Desorption） experiments were carried out to examine the desorption performance of Geranyl acetone on the modified lift zeotiles. Results showed that the modified Hfl zeotiles modified by H2 reduction method remained its crystal structure as it was. The surface acidic groups of the modified Hfl zeotiles reached as much as the original one, but its surface strong acidic groups greatly decreased or even disappeared. The result of TPD showed that Hfl zeotiles without H2 reduction had two type of active sites of adsorption toward Geranyl acetone, while after H2 reduction, the modified Hβ zeotiles only exhibited one kind of weak active sites of adsorption with strong active site disappearing, which resulted in improvement of desorption performance of Geranyl acetone from the modified lift zeotiles due to disappearance of their surface strong acidic groups.

关 键 词：HΒ分子筛 表面改性 香叶基丙酮 吸附 脱附 

分 类 号：TQ424.25[化学工程]