tailieunhanh - Synthesis of nanozeolites and nanozeolite-based FCC catalysts, and their catalytic activity in gas oil cracking reaction

A new method for the synthesis of nanosized zeolites in organic solvents, such as formamide and toluene as crystallization medium instead of water, in the presence of organosilane has been developed. Organic solvents have a great impact on the synthesis of nanozeolites. | Applied Catalysis A General 382 2010 231-239 Contents lists available at ScienceDirect Applied Catalysis A General journal homepage locate apcata Synthesis of nanozeolites and nanozeolite-based FCC catalysts and their catalytic activity in gas oil cracking reaction Gia-Thanh Vuonga Vinh-Thang Hoanga Dinh-Tuyen Nguyenb Trong-On Doa a Department of Chemical Engineering Laval University 1065 avenue de La médecine Québec G1V0A6 Canada b Institute of Chemistry Vietnamese Academy of Science and Technology Viet Nam ARTICLE INFO ABSTRACT Article history Received 1 February 2010 Received in revised form 23 April 2010 Accepted 26 April 2010 Available online 24 May 2010 Keywords Nanozeolites Formamide Non-aqueous synthesis FCC catalysts FCC cracking A new method for the synthesis of nanosized zeolites in organic solvents such as formamide and toluene as crystallization medium instead of water in the presence of organosilane has been developed. Organic solvents have a great impact on the synthesis of nanozeolites. Formamide which has similar properties to water is a good candidate as the solvent for the synthesis of nanosized zeolites. This synthetic method allows easy manipulation with the control of crystal sizes. In this study different crystal sizes such as 25 40 and 100 nm were prepared in toluene and formamide solvents. To study the effect of crystal nanosizes on the catalytic performance of nanosized zeolites nanozeolite-based FCC catalysts were also prepared using different nanozeolite sizes as active component and silica as inactive matrix. The activity of these catalysts was evaluated with FCC feedstock. The results revealed a good correlation between the crystal size of zeolites and the activity smaller nanozeolite-based FCC catalyst exhibits higher catalytic activity. 2010 Elsevier . All rights reserved. 1. Introduction Nanozeolites with the size of less than 200 nm have received much of interest recently because of their great potential .