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Mobil Zeolite Catalysts for Monomers
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In this article, the authors described the preparation of a member of a generation of new synthetic zeolites, called ZSM-5, which was unique because of its high silica/alumina ratio and greatly reduced coking rates for reactions with hydrocarbons.Abstract:
It has been about 20 years since Plank, Rosinski, and Hawthorne reported their spectacular results with metal-modified zeolite cracking catalysts for more efficient production of gasoline [1]. This discovery has saved an estimated 200 million barrels of crude oil each year in the United States alone [2]. In 1972, a patent by Argauer and Landolt described the preparation of a member of a generation of new synthetic zeolites, called ZSM- 5. It was unique because of its high silica/alumina ratio and greatly reduced coking rates for reactions with hydrocarbons by comparison with known low silica zeolites [3]. This material was an early member of a series of over 50 synthetic zeolitic substances prepared in Mobil laboratories.read more
Citations
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Organic catalysis over zeolites: A perspective on reaction paths within micropores
TL;DR: A broad classification and survey of organic chemistry over zeolites is presented in this paper, which reflects, for the most part, a mechanistic rather than a process or applications frame of reference.
Journal ArticleDOI
Inorganic molecular sieves: Preparation, modification and industrial application in catalytic processes
Cristina Martínez,Avelino Corma +1 more
TL;DR: The application of zeolite-based catalysts in the production of chemicals and fine chemicals is an emerging field, and will greatly depend on the discovery of new or known structures by alternative, lower cost, synthesis routes, and the fine tuning of their textural properties as mentioned in this paper.
Journal ArticleDOI
Zeolites: Catalysts for Organic Syntheses
TL;DR: The characteristic properties of zeolites, such as acidity, shape-selectivity and thermal stability, also enable them to be used for highly selective synthesis in the fields of chemical intermediates and fine chemicals as mentioned in this paper.
Journal ArticleDOI
Acid-catalyzed synthesis of mono- and dialkyl benzenes over zeolites: active sites, zeolite topology, and reaction mechanisms
Jiří Čejka,Blanka Wichterlová +1 more
TL;DR: In this article, a review of catalytic reactions leading to mono-and dialkyl benzenes over zeolites is presented, with an emphasis on the effect of the type of acid sites, zeolite structure, and reaction conditions on the activity and selectivity of these complex reactions.
Journal ArticleDOI
Perspectives of Micro/Mesoporous Composites in Catalysis
Jiří Čejka,Svetlana Mintova +1 more
TL;DR: In this paper, the recent development in the field of synthesis, characterization and particularly catalytic investigation of zeolite-based materials combining micro and mesoporous features is discussed, and the relevance of individual experimental techniques for analysis of the composites, i.e., their structure, porosity, chemical composition, morphological features, and so on, are described.
References
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Journal ArticleDOI
Selective alkylation of toluene with methanol to produce para-xylene
TL;DR: In this paper, a controlled reduction in the effective dimensions of the catalyst pore openings, and/or channels, along with deactivation of acidic surface sites, has been proposed as a mechanism for the selective production of p-xylene.
Journal ArticleDOI
Shape-selective reactions with zeolite catalysts: II. Selective disproportionation of toluene to produce benzene and p-Xylene
TL;DR: In this paper, a mechanism was proposed where oxides of these elements, present in the zeolites, reduce the dimensions of pore openings and channels sufficiently to favor formation and outward diffusion of p-xylene, the isomer with the smallest minimum dimension.
Journal ArticleDOI
Acidic Crystalline Aluminosilicates. New Superactive, Superselective Cracking Catalysts
BookDOI
New monomers and polymers
TL;DR: Polyimidines - A New Class of Polymers - Synthesis and Properties of Acetylene Terminated Aryl-Ether Oligomers - Phenylated Aromatic Hetrocyclic Polyphenylenes Containing Pendant Diphenylether and Diphenylsulfide Groups as discussed by the authors.