Isomerization of n-hexane on bifunctional catalysts Pt/HBEA and Pt/HMCM-22 with rare earth elements

被引：0
|
作者：
Martins, A
Silva, JM
Ribeiro, FR
Ribeiro, MF
机构：
[1] Inst Super Engn Lisboa, Dept Engn Quim, P-1950062 Lisbon, Portugal
[2] Univ Tecn Lisboa, Dept Engn Quim, Inst Super Tecn, P-1049001 Lisbon, Portugal
来源：
MOLECULAR SIEVES: FROM BASIC RESEARCH TO INDUSTRIAL APPLICATIONS, PTS A AND B | 2005年 / 158卷
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D O I：
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中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The influence of rare earth (RE) elements La, Nd, and Yb was studied oil the trans formation of n-hexane using two catalysts with different porous structures, HBEA and HMCM-22. The zeolites were submitted to ion exchange with rare earth nitrate solutions of La, Nd and Yb, followed by platinum introduction. Platinum was characterized by Temperature Programmed Reduction (TPR-H-2) and by toluene hydrogenation. Pt/HBEA samples show higher hydrogenation activities than Pt/HMCM-22. In transformation of n-hexane both zeolites present high selectivity for the isomerization reaction. The presence of RE elements in Pt/HBEA increases the selectivity for di-branched isomers. Pt/HMCM-22 shows low selectivity in di-branched isomers due to shape selectivity effects provoked by the introduction of RE elements in the pores of this zeolite.
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页码：1875 / 1882
页数：8
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