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R.B. LaPierre

Bio: R.B. LaPierre is an academic researcher from Mobil. The author has contributed to research in topics: Crystal structure & Ferrierite. The author has an hindex of 5, co-authored 5 publications receiving 1068 citations.

Papers
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Journal ArticleDOI
01 Nov 1988-Zeolites
TL;DR: The proposed framework structures are consistent with the known diffraction, sorption, and cation-exchange properties of zeolite beta.

483 citations

Journal Article
TL;DR: The tetrahedral framework structure of zeolite beta is disordered along (001) planes as mentioned in this paper, and the disordered structure is related by a/3 and/or b/3 displacements on (1) planes to three ordered polytype structures with triclinic, monoclinic and tetragonal symmetry.
Abstract: The tetrahedral framework structure of zeolite beta is disordered along (001). The disordered structure is related by a/3 and/or b/3 displacements on (001) planes to three ordered polytype structures with triclinic, monoclinic, and tetragonal symmetry. Three mutually perpendicular 12-ring channel systems are characteristic of the three ordered polytypes and the disordered beta structure. The proposed framework structures are consistent with the known diffraction, sorption an cation exchange properties of zeolite beta.

406 citations

Journal ArticleDOI
R.B. LaPierre1, A.C. Rohrman1, J.L. Schlenker1, J.D. Wood1, M.K. Rubin1, W.J. Rohrbaugh1 
01 Nov 1985-Zeolites
TL;DR: In this article, the structure of ZSM-12, a high-silica zeolite, was determined by analysis of electron and X-ray powder diffraction data combined with model building.

140 citations

Journal ArticleDOI
01 Nov 1985-Zeolites
TL;DR: ZSM-23 as discussed by the authors is a high-silica zeolite with lattice parameters of: a = 5.01 ± 0.02A, b = 21.52± 0.04A, and c = 11.13 ± 1.03A.

68 citations


Cited by
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Journal ArticleDOI
15 Jul 2011-Science
TL;DR: A series of mesoporous molecular sieves are synthesized that possess crystalline microporous walls with zeolitelike frameworks, extending the application of zeolites to the mesoporus range of 2 to 50 nanometers.
Abstract: Crystalline mesoporous molecular sieves have long been sought as solid acid catalysts for organic reactions involving large molecules. We synthesized a series of mesoporous molecular sieves that possess crystalline microporous walls with zeolitelike frameworks, extending the application of zeolites to the mesoporous range of 2 to 50 nanometers. Hexagonally ordered or disordered mesopores are generated by surfactant aggregates, whereas multiple cationic moieties in the surfactant head groups direct the crystallization of microporous aluminosilicate frameworks. The wall thicknesses, framework topologies, and mesopore sizes can be controlled with different surfactants. The molecular sieves are highly active as catalysts for various acid-catalyzed reactions of bulky molecular substrates, compared with conventional zeolites and ordered mesoporous amorphous materials.

728 citations

Journal ArticleDOI
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

Journal ArticleDOI
01 Nov 1988-Zeolites
TL;DR: The proposed framework structures are consistent with the known diffraction, sorption, and cation-exchange properties of zeolite beta.

483 citations

Journal ArticleDOI
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.
Abstract: Zeolites have proved to be valuable technical catalysts in petrochemistry and in oil processing. 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. This interesting area of application has grown continuously in recent years. The present article summarizes the various standard types of reaction involved in organic syntheses which can be catalyzed by zeolites; these include, inter alia, electrophilic and nucleophilic substitution reactions, isomerization of double bonds and carbon skeletons, as well as addition, elimination and hydrogenation reactions.

454 citations

Journal ArticleDOI
TL;DR: The presence of basic centers in some oxides has been recognized for a long time as being important in catalysis as mentioned in this paper, and usually both basic and acid sites exist simultaneously, either independently or in a concerted way.
Abstract: The presence of basic centers in some oxides has been recognized for a long time as being important in catalysis [1-4]. Usually both basic and acid sites exist simultaneously. The two centers may work independently or in a concerted way. For instance, in alcohol transformation, dehydration is favored on acidic sites and dehydrogenation on basic centers [3,5]. A large variety of materials are cited as having basic character. They include single-metal oxides (MgO, CaO, ZnO), supported alkali metals (Na/MgO, K/K2CO3), mixed-metal oxides (MgO-A12O3, ZnO-SiO2, MgO-TiO2), zeolites (X and Y saturated with alkaline cations of low electronegativity), hydrotalcite-type anionic clays, asbestoslike materials, carbon-supported basic catalysts, and basic organic resins. ∗ Present address: 16 rue Francois Gillet, 69003 Lyon, France.

451 citations