Catalysis by layer lattice silicates. I. The structure and thermal modification of a synthetic ammonium dioctahedral clay

Wright, Alan C.; Granquist, W. T.; Kennedy, J.V.

doi:10.1016/0021-9517(72)90202-3

Cited by 55 publications

(23 citation statements)

References 4 publications

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“…Ward (1968) and Kiviat and Petrakis (1973) showed how to determine the relative numbers of these sites. On the basis of ammonia and pyridine adsorption data, Wright et al (1972) noted the presence of Lewis and Brbnsted acidity in synthetic mica/montmorillonite.…”

Section: Surface Aciditymentioning

confidence: 99%

Physicochemical Properties of Montmorillonite Interlayered with Cationic Oxyaluminum Pillars

Occelli¹,

Tindwa

1983

Clays and clay miner.

229

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Abstract--By ion exchanging expandable clay minerals with large, cationic oxyaluminum polymers, "pillars" were introduced that permanently prop open the clay layers. On the basis of thermal, infrared spectroscopic, adsorption, and X-ray powder diffraction (XRD) analysis, the interlayering of commercial sodium bentonite with aluminum chlorohydroxide, lAI1304(OH)24(HzO)12] +7, polymers appears to have produced an expanded clay with a surface area of 200-300 m2/g. The pillared product contained both Br6nsted and Lewis acid sites. XRD and differential scanning calorimetry measurements indicated that the micropore structure of this interlayered clay is stable to 540~ Between 540 ~ and 760~ the pillared day collapsed with a corresponding decrease in surface area (to 55 m2/g) and catalytic cracking activity for a Kuwait gas oil having a 260~176 boiling range.

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Section: Surface Aciditymentioning

confidence: 99%

Physicochemical Properties of Montmorillonite Interlayered with Cationic Oxyaluminum Pillars

Occelli¹,

Tindwa

1983

Clays and clay miner.

229

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“…The dehydroxylation is partially reversible and the presence of fluoride in hydroxyl sites enhances the water sorption capacity. Wright et al (1972) concluded that the thermally activated substance had protons in the tetrahedral vacancies of the octahedral layer. We think that it is necessary to establish the mechanism of dehydration and dehydroxylation of mixed-layer mineral on heating, and of rehydration of the heated mineral.…”

Section: Discussionmentioning

confidence: 99%

An Expansible Mineral Having High Rehydration Ability

Tomita

1973

Clays and clay miner.

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“…8, under autogenous water vapor pressure for 12 to 72 hr. 53 The Barasym SSM-100 properties are published, [54][55][56][57] Figure 3. (Top) High voltage SEM micrograph of Sumecton SA at Â 3 k magnification displaying aggregates of clay platelets.…”

Section: Synthetic Clays-methods Of Preparationmentioning

confidence: 99%

Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

Utracki

Sepehr

Boccaleri

2007

Polymers for Advanced Techs

382

252

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Synthetic, layered nano-particles for polymeric nanocomposites (PNC's)Utracki, L. A.; Sepehr, M.; Boccaleri, E.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site Web page / page Web http://dx.doi.org/10.1002/pat.852 http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=15774991&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=15774991&lang=fr LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en This review discusses preparation and use of the synthetic layered nanoparticles in polymer matrices, i.e., in the polymeric nanocomposites (PNCs). Several types of synthetic or semi-synthetic layered materials are considered, namely the phyllosilicates (clays), silicic acid (magadiite), layered double hydroxides (LDHs), zirconium phosphates (ZrPs), and di-chalcogenides. The main advantage of synthetic clays is their chemical purity (e.g. absence of amorphous and gritty contaminants, as well as arsenic, iron, and other heavy metals), white to transparent color that assures reproducibly of brightly colored products, as well as a wide range of aspect ratios, p ¼ 20 to £6000. Several large scale production facilities have been established. The synthetic clay and LDH industries are oriented toward big volume markets: catalysis, foodstuff, cosmetics, pharmaceuticals, toiletry, etc. The use of these materials in PNCs is limited to synthetic clays and LDHs, mainly for reinforcement, permeability control, reduction of flammability, and stabilization, e.g. during dehydrohalogenation of chlorinated macromolecules. The use of lamellar ZrPs and di-chalcogenides is at the laboratory stage of functional polymeric systems development, e.g. for electrically conductive materials, catalysts or support for catalysts, in photochemistry, molecular and chiral recognition, or in fuel cell technologies, etc. Copyright # 2007 John Wiley & Sons, Ltd.KEYWORDS: polymeric nanocomposites; nanoparticles; clay; layered double hydroxides; matrix POLYMERS FOR ADVANCED TECHNOLOGIES Polym. Adv. Technol. 2007; 18: 1-37 Published online in Wiley InterScience (www.interscience.wiley.com) DOI: 10.1002/pat.852 AUTHORS' BIOGRAPHIESDr Leszek A. Utracki was born and educated (up to Habilitation) in Poland. After the post-doctoral stage at USC in Los Angeles with Robert Simha he settled in Canada. His passionate research interest has been within the field of thermodynamics, rheology and processing of multicomponent, multiphase polymeric systems. During the 55 years in the profession he has published several hundred articles, book chapters, books, patents, etc., which has placed him on the ISI li...

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Catalysis by layer lattice silicates. I. The structure and thermal modification of a synthetic ammonium dioctahedral clay

Cited by 55 publications

References 4 publications

Physicochemical Properties of Montmorillonite Interlayered with Cationic Oxyaluminum Pillars

Physicochemical Properties of Montmorillonite Interlayered with Cationic Oxyaluminum Pillars

An Expansible Mineral Having High Rehydration Ability

Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

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