摘要
在Ｐｔ／ＬａＫＬ沸石催化剂中ＰｔＬａ之间存在有相互作用，伴随着Ｌａ３＋的迁移，Ｐｔ粒子更多地进入沸石孔道内部，而不是聚集于沸石外表面，因而改善了Ｐｔ的分散度。适量Ｌａ的引入既保持了Ｐｔ／ＫＬ沸石催化剂较高的芳构化性能，又能较大程度地改善其抗硫性能。
129XeNMR and TEM were used to study the location and dispersion of Pt particles in KL zeolite with lanthanum incorporation. Due to the interaction between Pt and La, more Pt particles accompanying La^3+ were located in the inner channels of KL zeolite, rather than agglomerated in the external surface. The dispersion of Pt particles was therefore improved. Pt/KL zeolite modified by La showed a little lower reactivity for n-hexane aromatization ,but much higher resistance to sulfurpoisoning because of the existence of new acidic sites.
出处
《中国稀土学报》
CAS
CSCD
北大核心
1998年第2期170-173,共4页
Journal of the Chinese Society of Rare Earths
关键词
镧
KL沸石
催化剂
芳构化
沸石
铂
改性
Rare earths, lanthanum, KL zeolite, Pt supported catalyst, Aromatization
