摘要
通过把Ｇｄ引入Ｐｔ／ＫＬ分子筛单功能重整催化剂，研究ＰｔＧｄ／ＫＬ和Ｐｔ／ＧｄＫＬ分子筛的重整反应性能和活性中心以及催化剂的表面酸碱性。结果表明，Ｇｄ的引入方式和引进量对催化重整反应有明显影响。共浸法制备的催化剂ＰｔＧｄ／ＫＬ，其芳构活性比离子交换法制备的催化剂Ｐｔ／ＧｄＫＬ高，Ｇｄ含量为０１％的Ｐｔ０１Ｇｄ／ＫＬ芳构活性最好。弱酸性和弱碱性物质以及硫化物对ＰｔＧｄ／ＫＬ和ＰｔＧｄＫＬ催化重整反应的影响Ｇｄ小于不含Ｇｄ的Ｐｔ／ＫＬ。Ｇｄ对催化重整反应有两方面影响：其一是与金属Ｐｔ相互作用增加活性中心、加强金属功能；其二是增加催化剂的酸性和裂解产物，降低芳构选择性。
Gadolinium was added to Pt/KL zeolite monofunctional catalyst in order to study aromatization activity, active sites and some other surface properties of Pt Gd/KL and Pt/GdKL. The results show that the way and the content of Gd adding into the Pt/KL catalyst have remarkable influence on the catalytic performance. The aromatization activity of Pt Gd/KL is higher than that of Pt/GdKL and the catalyst Pt 01Gd/KL with 0 1% Gd has the highest aromatization activity. Besides, carbon sulfide and weakly acidic substance phenol as well as weakly basic substance triethylamine can influence the catalytic performance, however, the effect on the reforming reaction over the catalyst Pt Gd/KL or Pt/GdKL, is smaller than that over the catalyst Pt/KL. Gd may influence catalytic performance by two ways, namely, (1) the Gd in Pt Gd/KL increases mainly the active sites of catalyst and enhances the metal function of catalyst; (2) the Gd in Pt/GdKL increases the acidity in the catalyst and decreases aromatization activity and selectivity.
出处
《中国稀土学报》
CAS
CSCD
北大核心
1998年第4期319-324,共6页
Journal of the Chinese Society of Rare Earths
基金
江西省自然科学基金
南昌大学青年基金
关键词
稀土
钆
KL分子筛
芳构化
催化重整
催化剂
Rare earths, Zeolite KL, Aromatization, Catalytic reforming, Active sites
