Author
Stephen A. Butter
Bio: Stephen A. Butter is an academic researcher from Mobil. The author has contributed to research in topics: Catalysis & Zeolite. The author has an hindex of 15, co-authored 21 publications receiving 2103 citations.
Papers
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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.
513 citations
TL;DR: In this article, data were presented for para-selective and nonselective formation of xylenes from alkylation of toluene with methanol and disproportionation over ZSM-5 class zeolite catalysts.
381 citations
TL;DR: Chang and Silvestri as discussed by the authors showed that methanol and/or its ether reacted on the phosphorus-modified ZSM-5 zeolite to yield ethylene as the primary products, probably via a methyl ethyl ether intermediate, followed by alkylation of the ethylene with methanoline or its ether to give an olefin with one additional carbon atom.
333 citations
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.
266 citations
Patent•
26 Jul 1974TL;DR: In this article, the authors discuss the process of converting alcohols, aliphatic mercap-tans and substituted aromatic rings to other desirable products by contacting such with a particular type of aluminosilicate molecular sieve catalyst at elevated temperature.
Abstract: OF THE DISCLOSURE Process of converting alcohols, aliphatic mercap-tans, aliphatic sulfides, aliphatic halides and/or aliphatic amines to other desirable products by contacting such with a particularrtype of aluminosilicate molecular sieve catalyst at elevated temperature. Products produced by such conver-sion vary with temperature, with conversion to aromatic rings and substituted aromatic rings predominating at higher tem-peratures of about 300 to 500°C. The catalyst is a zeolite having a high silica to alumina ratio of at least about 12 and a constraint index of about 1 to 12. It also preferably has a crystal density in the hydrogen form of not substan-tially less than about 1.6.
138 citations
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TL;DR: The literature related to methanol-to-hydrocarbons (MTHC) technology over the past two decades has been reviewed, covering mainly the MTO and MTG reactions as mentioned in this paper.
1,283 citations
961 citations
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.
564 citations
TL;DR: The shape-selective catalysis as discussed by the authors was proposed to increase the selectivity of a desired product and reduce the coke formation in zeolite catalysts by reducing the number of catalytic sites inside the pore structure.
556 citations
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.
549 citations