摘要
采用高纯Ｎ＿２保护，利用ＦＴＩＲ－ＴＰＤ技术研究吡啶在５Ａ分子筛上的动态行为。试验结果表明：５Ａ分子筛吸附吡啶后，其升温脱附分四个阶段进行。这四个阶段分别为痕量水；氢键吡啶：Ｌ酸共价键吡啶；Ｂ酸离子键吡啶的脱附过程。动力学数据处理结果：Ｌ酸中心和Ｂ酸中心吸附吡啶后的表观脱附活化能分别为３７．２ｋＪ／ｍｏｌ和７０．２ｋＪ／ｍｏｌ。
The dynamic behaviour of adsorbed pyridine on 5A molecular sieve was studied underan atmosphere of highly purified nitrogen by applyingthe Fourier Transform Infrared-pro-gramed Temperature Desorption (FTIR-TPD) method.It can be shown that the desorptionprocess of the adsorbed pyridine consisted of 4 steps namely,the desorption of a trace ofwater,hydrogen bonded pyridine, covalent-bonded,pyridine on Lewis acid site,and ion-bonded pyridine on Bronsted acid sites.It is found,by processing the experimental dynamicdata,that the apparent desorption activation energy of the Lewis acid site and Bronsted acidsite are 37.2kJ/mol and 70.2kJ/mol,respectively.
出处
《石油化工》
CAS
CSCD
北大核心
1994年第11期747-750,共4页
Petrochemical Technology
基金
国家自然科学基金
