I use LTL-type zeolite in my research for dehydrogenation.
Comparing with other types of zeolites, the result of platinum incorporated LTL-type zeolite was so low. The incorporation of platinum was conducted through ion-exchange with Pt(NH3)2Cl2 following with hydrogen reduction.
Basically, LTL-type zeolite has a low Si/Al ratio, so I expected it could show the highest performance among all zeolites. However, the result tells that LTL-type zeolite had the poorest catalytic performance.
The only reason I can guess is that LTL-type zeolite was originally prepared in K-form. Is it possible that the Platinum complex (Pt(NH3)2+) fails to replace Potassium cation (K+) due to steric hindrance?
Tony Ch
Not only Steric hindrance , but there is possibility that increased electron shell shielding the outer electron may not allow other reactant to react. as ionic radius of both sodium and potassium are apart by 0.42 Å. If platinum complex you are using is of that size in between then definitely hindrance factor will come into the picture ( Na:1.54 Å, K:1.96 Å)
Although, you didn't have any characterization ,but it seems platinum change to cluster form and you didn't see catalytic activity
Hi
Can you write me ,which kind of characterization using in this work to confirm the present of Pt in the zeolite.
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