جامعة الملك عبدالعزيز
جامعة الملك عبدالعزيز
King Abdulaziz University 		مركز النشر العلمي
Center of Scientific Publications

 
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Document Details

Document Type : Article In Conference 
Document Title :
A new template-free route to mesoporous ZSM-5 microspheres
A new template-free route to mesoporous ZSM-5 microspheres
 
Subject : كيمياء 
Document Language : English 
Abstract : Zeolites have been applied widely on catalytic processes because their intricate micropores provide different types of shape selectivity1. However, their small pore size brings diffusion and mass transfer limitations, which can be solved by using zeolite nanocrystals or mesoporous zeolites. Since the use of zeolite nanocrystals will cause much higher pressure drops in packed-bed reactors and difficult recycles of catalysts, interests are focused on preparation of mesoporous zeolites. Generally, uniform mesopores in zeolite crystals are generated by adding soft2,3 or rigid4 templates into zeolite synthesis systems. Here, mesoporous ZSM-5 was prepared via a new template-free method. This method involves in-situ hydrothermal crystallization of the alumina-silica xerogel converted from uniform-sized sol particles by vacuum drying process. The obtained mesoporous ZSM-5 has micro-spherical morphology (Figure 1) and contains highly crystallized zeolite structures and bimodal mesopores (2.5±0.2nm, 11.7±3.1nm, Figure 2). Toluene-TPD and mesitylene-TPD results show that mesoporous ZSM-5 has obvious advantages over conventional micrometer-sized ZSM-5 in diffusion and mass transfer of organic molecules. The diffusion coefficient of toluene (or mesitylene) within the former is 2 (or 7) orders of magnitude higher than that within the latter. 
Conference Name : Tenth International Symposium on Heterogeneous Catalysis 
Duration : From : 22/8/1429 AH - To : 26/8/1429 AH
From : 23/8/2008 AD - To : 27/8/2008 AD 
Publishing Year : 1429 AH
2008 AD 
Article Type : Article 
Added Date : Monday, February 16, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
Wei HanWei HanResearcherDoctorate 
Yuxin JiaYuxin JiaResearcherDoctorate 
Guoxing XiongGuoxing XiongResearcherDoctorate 
Weishen YangWeishen YangResearcherDoctorate 

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