tailieunhanh - FCC catalysts with different zeolite crystallite sizes: acidity, structural properties and reactivity

Two FCC catalysts with a 60 m average size, prepared with different crystallite sizes ( and m), are studied in terms of total acidity, energy of ammonia desorption, specific surface area, relative amount of Brönsted and Lewis acid sites, crystallite and particle size, and micropore size distribution. | Available online at APPLIED. _ CATALYSIS A GENERAL ELSEVIER Applied Catalysis A General 270 2004 9-25 locate apcata FCC catalysts with different zeolite crystallite sizes acidity structural properties and reactivity G. Tonettoa J. Atiasb H. de Lasaa a Chemical Reactor Engineering Centre Faculty of Engineering Science University of Western Ontario London Ont. Canada N6A 5B9 b Departamento de Termodinámicay Fenomenos de Transferencia Universidad Simon Bolivar Caracas Venezuela Received in revised form 21 March 2004 accepted 25 March 2004 Abstract Two FCC catalysts with a 60 1-im average size prepared with different crystallite sizes and 1-im are studied in terms of total acidity energy of ammonia desorption specific surface area relative amount of Bronsted and Lewis acid sites crystallite and particle size and micropore size distribution. Characterization of these catalysts is relevant in view of their application to test the extent of intracrystallite diffusive transport influence on the overall catalytic cracking rates as developed in separate studies Ind. Eng. Chem. Res. 42 2003 4162 in a novel CREC Riser Simulator. 2004 Elsevier . All rights reserved. Keywords Y zeolite FCC catalysts Nitrogen adsorption Ammonia TPD Surface area Porosity 1. Introduction Catalytic cracking of hydrocarbons combined with fluid bed processes FCC is one of the most important and most profitable processes in the petroleum refining industry 2 . FCC units are used to upgrade heavy gas oils to gasoline diesel fuel and light gases. Catalytic cracking of hydrocarbons is a vapor-phase reaction occurring via a carbonium ion mechanism. This reaction is catalyzed by materials having acidic properties 3 4 . The introduction of zeolite cracking catalysts in the early 1960s revolutionized the petroleum refining industry. Y zeolites have been used extensively in catalytic cracking since 1962. The currently available commercial FCC catalysts are .

• Báo cáo khoa học
• Catalysts preparation
• FCC catalysts
• Structural properties
• Catalytic cracking
• Ammonia adsorbed
• Microporous Solids
• Journal of Chemistry
• Tin based catalysts
• Acetylene hydrochlorination
• Poly vinyl chloride
• Vinyl chloride monomer
• Acid catalysts
• Indigestible dextrin
• Physicochemical property
• Rice starch
• Rice starch by pyrolytic reaction
• Công nghệ hóa học
• Catalytic properties
• Polymer supported catalysts
• Chất xúc tác
• Chất xúc tác polymer
• Hóa hữu cơ
• Iron catalyst
• Water treatment
• Methylene blue degradation
• Heterogeneous fenton type nano catalysts
• Modified Fenton type oxidation
• Carbon dioxide
• Methanol economy
• Mesoporous material
• Converting CO2 to methanol
• Advanced Ni Ga based catalysts
• báo cáo khoa học
• báo cáo hóa học
• công trình nghiên cứu về hóa học
• tài liệu về hóa học
• cách trình bày báo cáo
• Direct current magnetron sputtering
• Hydrogen generation
• Sodium borohydride
• X ray diffraction (XRD)
• Complete liquid phase method
• CuZnAl catalyst
• Higher alcohols
• Nonmetal promoter