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Co-hydrolysis and Seed-induced Synthesis of Basic Mesoporous ZSM-5 Zeolites with Enhanced Catalytic Performance.
Chemistry ; 2020 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-31909848
For zeolite catalysts, the regulation of active site and pore structure plays an important role in the enhancement of their catalytic performance. In this work, we proposed a one-pot and organic template-free co-regulation route to straightforwardly synthesize basic mesoporous ZSM-5 zeolites with adjustable alkaline-earth metal species. The synthesis pathway combines two decisive strategies: 1) the seed-induced interface assembly growth method and 2) the acidic co-hydrolysis/condensation of aluminosilicate species and alkaline earth metal (e.g., Mg, Ca, Sr or Ba) sources. It is interesting that the mesoporous structure was self-evolved through particle-attached seed-interfacial crystallization without the assistance of any template. Meanwhile, the incorporation of alkaline-earth metals species is homogenous and highly dispersed in the solid products during the whole crystallization process, and finally generate the superior basicity. Catalysis tests of the as-synthesized samples displayed novel performance in the typical base reaction of Knoevenagel condensation, even for the bulky substrates due to the enhanced diffusion rising from meso/microporous network. This finding opens new possibilities for facile, cost-effective, and environment-friendly synthesis of mesoporous high-silica zeolites with tunable acid/base properties, and deepens our understanding of the particle-attached crystallization.





Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Assunto da revista: Química Ano de publicação: 2020 Tipo de documento: Artigo País de afiliação: China