摘要
利用ＴＰＤＥ、ＴＰＤ和ＸＲＤ等手段研究了低温恒温脱胺后再程序升温脱胺的组合脱胺法．结果表明，不同组合脱胺工艺均可调变β沸石的表面酸性，适当选择组合脱胺温度可大幅度调变β沸石的表面酸性，其中２７０℃和２９０℃下分别恒温脱胺后再程序升温脱胺，β沸石表面除出现传统脱胺的两个酸性位外，还出现了一个中等强度的酸性位，且酸量很大，可调变性较强．晶相测定可知，低温脱胺后再程序升温脱胺有利于β沸石结晶度的保持．此外，还对β沸石的脱胺过程和脱胺后β沸石的吡啶脱附过程的动力学行为进行了初步的研究．
The combination method of temperature programmed decomposition of tetraethylammonium (template) after calcined at lower temperature was studied by TPDE, TPD and XRD. It is shown that the different combination methods may modify the surface acidity of zeolite β, and the choice of suitable temperature for combination de amine may change acidity to a great extent, in which zeolite β emerges an acidic site of medium strength with great acid amount other than two acidic sites with the conventional de amine method. XRD results suggest that the combination de amine methods are favourable to maintain the crystallinity of zeolite β, in addition, the kinetic behavior of the thermal decomposition process and desorption of pyridine were also studied.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1997年第5期397-401,共5页
关键词
Β沸石
程序升温
脱胺
酸性
结晶度
沸石
Zeolite β, Temperature programmed technique, Deamination, Acidity, Crystallinity, Kinetics
