物理化学学报Issue(6)：1273-1280,8.DOI:10.3866/PKU.WHXB201303183
原位傅里叶变换红外光谱研究Y型分子筛表面酸性对吸附有机分子的影响
Influence of Surface Acidity of Y Zeolites on the Adsorption of Organic Molecules by In situ Fourier Transform Infrared Spectroscopy
摘要
Abstract
The surface acidity of Y-type zeolites (HY and NaY) modified by solid state ion exchange (SSIE) and liquid phase ion exchange were characterized by in situ Fourier transform infrared (FTIR) spectroscopy using pyridine as the probe molecule (Py-FTIR). The adsorption of single probe molecules (thiophene, cyclohexene and benzene) and double probe molecules (thiophene and cyclohexene, thiophene and benzene) compared with sorbents were studied using in situ FTIR spectroscopy. The results indicated that the Brönsted acid (B acid) of HY (L-CeY) is the catalytic center of cyclohexene dimerized alkenyl carbenium ions and thiophene oligomerization, while the Lewis acid (L acid) is the major center of adsorption of thiophene, cyclohexene, and benzene. In addition, there is strong chemisorption and competitive adsorption of cyclohexene and thiophene, which provides evidence for the poor performance of removing sulfur. The S-CeY zeolite has abundant of weak Lewis acid sites. The sorbent is good at absorbing thiophene, while the influence of the competition adsorption of cyclohexene was not predominately. As to NaY zeolite, there is no preference for adsorption of thiophene, cyclohexene and benzene.关键词
原位傅里叶变换红外光谱/改性Y分子筛/表面酸性/竞争吸附/催化反应Key words
In situ Fourier tansform infrared spectroscopy/Modified Y zeolite/Surface acidity/Competitive adsorption/Catalytic reaction分类
化学化工引用本文复制引用
张晓彤,于文广,秦玉才,董世伟,裴婷婷,王琳,宋丽娟..原位傅里叶变换红外光谱研究Y型分子筛表面酸性对吸附有机分子的影响[J].物理化学学报,2013,(6):1273-1280,8.基金项目
国家自然科学基金(20976077,21076100),中国石油天然气股份有限公司炼油催化剂重大专项(10-01A-01-01-01),辽宁省高校创新团队项目(200T110)及辽宁省高端人才队伍建设项目资助 （20976077,21076100）
