The syntheses of thermally stable chromium-incorporating hexagonal mesoporous aluminophosphate and cubic Cr-MCM-48 have been reported. Characterization of the catalysts was made using low angle XRD, N2 adsorption, UV-VISDRS, thermal analysis, ICP-AES and ESR. Mesoporous Cr-AlPO4 and Cr-MCM-48 catalysts have been found to be active for the vapour phase oxidation of toluene with molecular oxygen. Mesoporous Cr-AlPO4 is found to exhibit both acidic and redox properties and hence oxidation as well as dealkylation reactions are taking place in a concerted manner, whereas, the cubic silicate analogue acts as a pure redox catalyst. © 2002 Elsevier Science B.V. All rights reserved.

Balasubramanian Viswanathan

Thirukkallam Kanthadai Varadarajan

Chromium

Mesoporous Materials

oxidation

Paramagnetic resonance

Synthesis (chemical)

Thermoanalysis

toluene

ultraviolet radiation

X ray diffraction

PARTIAL OXIDATION

CATALYSTS

Fulltext

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Catalytic oxidation of toluene with molecular oxygen over Cr-substituted mesoporous materials

Applied Catalysis A: General

This chapter summarizes the synthesis, characterization of microporous and mesoporous (nanoporous) aluminophosphates and the metal-substituted analogs with their catalytic oxidation behavior in several organic transformations. These materials exhibit structural and compositional diversity as well as a wide range of pore openings. The framework incorporation of transition-metal ions, namely, isomorphous substitution in the framework structure, creates active (redox) sites in the aluminophosphate matrix, which opens routes towards shape selective catalysis. The importance of transition-metal ions and their unique features for the oxidation reactions is elaborated in this review

Liquid Phase Oxidation via Heterogeneous Catalysis: Organic Synthesis and Industrial Applications

Selective Catalytic Oxidation over Ordered Nanoporous Metallo-Aluminophosphates

Mesoporous cubic MCM-48 was synthesized at a lower concentration of the surfactant. XRD, N 2 adsorption and electron microscopic studies confirmed the formation of cubic phase. Spectroscopic and electron spin resonance techniques confirmed the presence of heteroatom within the framework. The catalytic activities of various acid catalysts have been examined for vapour phase alkylation of naphthalene with alcohols and these studies revealed that aluminium substituted cubic MCM-48 was more active compared to Fe-MCM-48, Al-MCM-41 and H-Y zeolite. © 2004 Elsevier B.V. All rights reserved.

Journal of Molecular Catalysis A: Chemical

Alkylation of naphthalene with alcohols over acidic mesoporous solids

The potentialities of mesoporous materials both as catalysts and catalytic supports in reactions like alkylation, hydrogenation, and oxidation of various substrates are reviewed. Much of our current research effort is devoted to exploring the mechanistic aspects of the reactions, the role of the catalyst structure, and to characterizing the active sites. Copyright © Taylor & Francis, Inc.

Catalysis Reviews - Science and Engineering

Alkylation, hydrogenation and oxidation catalyzed by mesoporous materials

The synthesis of mesoporous Cr-AlPO was carried out under hydrothermal conditions. Characterisation of the catalyst was done with low angle XRD, N 2 adsorption, UV-VISDRS, ESR and thermal analysis. The catalytic activity was tested for partial oxidation of toluene with molecular oxygen in vapour phase. It was observed that Cr-AlPO functions both as acid and redox catalyst. © 2002 Elsevier Science B.V. All rights reserved.

Catalysis Communications

Partial oxidation of toluene by O2 over mesoporous Cr-AlPO

Self-assembled ordered cetyltrimethylammonium bromide (CTAB) is used as a template for the synthesis of mesoporous silicoaluminophosphates with varying Si/Al ratio.

Chemical Communications

Synthesis and characterization of mesoporous SAPO

Synthesis of mesoporous hexagonal titanium aluminophosphate molecular sieves and their catalytic applications

Chemistry of Materials

Synthesis and Characterization of Lamellar and Hexagonal Mesostructured Aluminophosphates Using Alkyltrimethylammonium Cations as Structure-Directing Agents

Synthesis of mesoporous aluminophosphates using surfactants with long alkyl chain lengths and triisopropylbenzene as a solubilizing agent

Journal	Applied Catalysis A: General
ISSN	0926860X
Open Access	Yes