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Indexed by:Journal Papers

Date of Publication:2015-12-22

Journal:ADVANCED FUNCTIONAL MATERIALS

Included Journals:SCIE、EI、Scopus

Volume:25

Issue:48

Page Number:7479-7487

ISSN No.:1616-301X

Key Words:double shells; functionalized interior; hollow ZSM-5; silicon-rich surface; TPAOH treatment

Abstract:Hollow ZSM-5 single crystals with silicon-rich exterior surface are prepared by a dissolution-recrystallization strategy in tetrapropylammonium hydroxide solution. Selective dissolution and exterior recrystallization cause the silicon components to migrate from the inside to outside, resulting in a regular void in the interior of the crystal, increased Bronsted acid sites and a silicon-rich external surface. The as-prepared hollow ZSM-5 exhibits excellent acid catalysis with enhanced shape selectivity, as shown in biphenyl methylation as a probe reaction, which is attributed to the silicon-rich external surface and thus the inhibition of isomerization on external surface. More interestingly, hollow ZSM-5 single crystals with double shells are successfully prepared by layer-by-layer technique followed with dissolution-recrystallization strategy. Furthermore, hollow ZSM-5 encapsulating iron and carbon nanotubes are successfully synthesized. Furthermore, hollow ZSM-5 nanosized crystals with the interior functionalized as bimetallic (oxide) nanoparticles such as CuO-Pd are also successfully synthesized.