Journal ArticleDOI
Surface properties and porosities of silica and acid-treated montmorillonite catalyst supports: influence on activities of supported ZnCl2 alkylation catalysts
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In this paper, a series of progressively acid-treated montmorillonite clays and a range of porous silicas are tested for their effectiveness as supports for ZnCl2 alkylation catalysts.Abstract:
A series of progressively acid-treated montmorillonite clays and a range of porous silicas are tested for their effectiveness as supports for ZnCl2 alkylation catalysts. Support materials are characterised in terms of surface areas, pore volumes and pore size distributions, in an attempt to identify surface properties important in conferring catalytic activity to supported ZnCl2. The highest catalytic activities are associated with acid-treated clay and silica supports with significant volumes in pores of diameter 10–12 nm. Supports exhibiting pore diameters below this range produce catalysts of very low activities. The fall in catalytic activity associated with larger pore diameter supports is less dramatic. Suggested mechanisms by which the catalytic activity of ZnCl2 is enhanced in pores within the critical size range are proposed.read more
Citations
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Preparation and catalytic properties of cationic and anionic clays
TL;DR: In this paper, the structure, main properties and preparation methods of cationic and anionic clays are reviewed in light of the versatility and potential of these materials, which may be useful tools in the move towards establishing environmentally friendly technologies.
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Clays and catalysis: a promising future
TL;DR: The main properties of cationic and anionic clays as well as their role in catalysis are discussed in this paper in light of the versatility and potential of these materials, which may be very useful tools in the move towards establishing environmentally friendly technologies.
Journal ArticleDOI
Determination of structural modification in acid activated montmorillonite clay by FT-IR spectroscopy.
TL;DR: The structural modifications and the Bronsted acid sites generated during the acid treatment of montmorillonite clay with varied concentration of sulphuric acid was determined using FT-IR spectroscopy using a rapid technique.
Journal ArticleDOI
Benzylation of benzene and other aromatics by benzyl chloride over mesoporous AlSBA-15 catalysts
TL;DR: Aluminum-containing mesoporous molecular sieves AISBA-15 with different n(Si)/n(Al), ratios and AIMCM-41 have been synthesized hydrothermally and characterized in detail by physicochemical methods, viz. XRD, N-2 adsorption and Al-27 NMR spectroscopy as discussed by the authors.
Journal ArticleDOI
Mineralogy of a bentonite from Miles, Queensland, Australia and characterisation of its acid activation products
TL;DR: The mineralogy of a bentonite from Miles, Queensland, Australia, before and after acid treatment (by reflux in 53 M HCl at 80 °C) has been assessed by IR, XRD and chemical analysis as mentioned in this paper.
References
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Journal ArticleDOI
The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen Isotherms
Journal ArticleDOI
Catalysis of Friedel‐Crafts Alkylation by a Montmorillonite Doped with Transition‐Metal Cations
Pierre Laszlo,Arthur Mathy +1 more
TL;DR: In this article, the interstitial cations in the K10 montmorillonite were exchanged to obtain catalysts for Friedel-Crafts alkylation with halides, alcohols, and olefins.
Journal ArticleDOI
Chemical Characterization of Catalysts. I. Poisoning of Cracking Catalysts by Nitrogen Compounds and Potassium Ion
Journal ArticleDOI
Structural characterisation and optimisation of acid-treated montmorillonite and high-porosity silica supports for ZnCl2 alkylation catalysts
TL;DR: In this paper, the effect of acid treatment of montmorillonite clay on its activity as a support for ZnCl2 alkylation catalyst was examined, and the maximum activity was associated with long acid treatment times.
Journal ArticleDOI
Mechanisms for hydrogen to aluminum transformations in clays
TL;DR: In this paper, the rates of Al release from montmorillonite and daolinite clays by acid-dissolution techniques were determined and a diffusion controlled edge attack was proposed in the case of kaolinite and an all surface attack is proposed for montmorillite.
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Structural characterisation and optimisation of acid-treated montmorillonite and high-porosity silica supports for ZnCl2 alkylation catalysts
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