Abstract
A core-shell HZSM-5@silicalite-1 composite was synthesized by overgrowing silicalite-1 on the external surface of HZSM-5, and was characterized by XRD, SEM, TEM, NH3-TPD, 1,3,5-triisopropylbenzene (TIPB) cracking and N2 adsorption-desorption techniques. When used as a catalyst for the formation of p-xylene through toluene methylation with methyl bromide, the HZSM-5@silicalite-1 composite exhibits para-selectivity of up to 76% with no evidence of deactivation in an on stream period of 3 h. The excellent catalytic performance is attributed to the inactive silicalite-1 shell that extends the diffusion path length of xylenes while having the acid sites on the external surface of HZSM-5 fully covered.
Original language | English |
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Pages (from-to) | 37296-37301 |
Number of pages | 6 |
Journal | RSC Advances |
Volume | 4 |
Issue number | 70 |
DOIs | |
Publication status | Published - 2014 |