Cerium-containing MCM-41 materials as selective acylation and alkylation catalysts

Kadgaonkar, M. D.; Laha, S.C.; Pandey, Rajesh K.; Kumar, Pradeep; Mirajkar, S. P.; Kumar, Rajiv

doi:10.1016/j.cattod.2004.07.009

Cited by 83 publications

(46 citation statements)

References 13 publications

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“…The UV-vis spectrum of Ce-MCM-41 clearly displays a high intensity band below 430 nm with a maximum around 300 nm that is due to Ce-O charge-transfer. 27 Kadgaonkar et al 17 claimed that the absorption band centered at 300 nm is due to the presence of well-dispersed tetra-coordinated Ce 4+ species. supported Rh catalyst, the NO/CO reactions were carried out in a flow-mode microreactor system with a flow-rate ratio of NO/CO = 1.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Catalysis of Ce-MCM-41

Chien¹,

Kuo²,

Chen³

2005

Jnl Chinese Chemical Soc

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The cerium-containing MCM-41 (Ce-MCM-41) has been synthesized by direct hydrothermal method. The low-angle XRD patterns revealed the typical five major peaks of MCM-41 type hexagonal structures. The interplanar spacing d100 = 38.4 Å was obtained that can be indexed on a hexagonal unit cell parameter with ao = 44.3 Å which was larger than that of pure siliceous MCM-41 (Si-MCM-41). Transmission electron micrograph shows the regular hexagonal array of uniform channel characteristics of MCM-41. The BET surface area of Ce-MCM-41 was 840 m 2 /g, which is much reduced as compared to that of Si-MCM-41, with the pore size of 26.9 Å and mesopore volume of 0.78 cm 3 /g were measured by nitrogen adsorption-desorption isotherm at 77 K. Along with the results, the synthesized Ce-MCM-41 exhibited a well-ordered MCM-41-type mesoporous structure with the incorporation of cerium. Using Ce-MCM-41 as a support, the Rh (0.5 wt%) catalyst exhibited very high activity for the NO/CO reactions.

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Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Catalysis of Ce-MCM-41

Chien¹,

Kuo²,

Chen³

2005

Jnl Chinese Chemical Soc

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“…On the other hand, pore size decreased slightly with Ni incorporation in the MCM-41 13 , probably due to a blockage of the pore entries by NiO particles. Nonetheless, pore size remains constant after Ce impregnation for the MCM-41 indicating that these species will be also located on the external surface of the material [35][36][37] . 38 that the application of t-plot method should be used with caution when dealing with small mesopores diameters (namely, MCM-41).…”

Section: Catalysts Characterizationmentioning

confidence: 99%

Micro- and mesoporous supports for CO2 methanation catalysts: A comparison between SBA-15, MCM-41 and USY zeolite

Bacariza

Graça

Bebiano

et al. 2018

Chemical Engineering Science

111

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This version is available at https://strathprints.strath.ac.uk/62298/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. All the results are comparable to the obtained using a HNaUSY zeolite with Si/Al=2.8 as support. Cerium incorporation on Ni/mesoporous supports allowed enhancing the CO2 conversion, especially at lower temperatures, as already reported for the zeolite-based samples.

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“…Similar results were observed over various SAPO for the isopropylation of biphenyl to produce 4,4'-diisopropylbiphenyl, [247] over H-ZSM-5 zeolite for the ethylation of ethylbenzene to 1,4-diethylbenzene [249] and over H-mordenite zeolite for the tert-butylation of toluene to 4-tert-butyltoluene. [250,251] Ce-Al-MCM-41-type mesoporous silicate materials was found to exhibit catalytic activities for isopropylation of naphthalene [252] and benzylation of toluene. [253] Both the density and the strength of the acid sites were considerably higher in the samples containing both Ce and Al than in the samples with only one of these substituents.…”

Section: Alkylation Of Aromatic Compoundsmentioning

confidence: 99%

“…Ce-MCM-41 [252] and ceria-yttria catalysts [257] were found to be good catalysts for the acylation of alcohols, amines, and thiols with acetic anhydride without solvent [252] or in the presence of acetonitrile. [257] Ceria-yttria catalysts exhibit strong Lewis acid properties.…”

Section: Acylation Of Alcohols Amines or Thiolsmentioning

confidence: 99%

Ceria‐Based Solid Catalysts for Organic Chemistry

Vivier¹,

Duprez²

2010

ChemSusChem

352

244

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Ceria has been the subject of thorough investigations, mainly because of its use as an active component of catalytic converters for the treatment of exhaust gases. However, ceria‐based catalysts have also been developed for different applications in organic chemistry. The redox and acid–base properties of ceria, either alone or in the presence of transition metals, are important parameters that allow to activate complex organic molecules and to selectively orient their transformation. Pure ceria is used in several organic reactions, such as the dehydration of alcohols, the alkylation of aromatic compounds, ketone formation, and aldolization, and in redox reactions. Ceria‐supported metal catalysts allow the hydrogenation of many unsaturated compounds. They can also be used for coupling or ring‐opening reactions. Cerium atoms can be added as dopants to catalytic system or impregnated onto zeolites and mesoporous catalyst materials to improve their performances. This Review demonstrates that the exceptional surface (and sometimes bulk) properties of ceria make cerium‐based catalysts very effective for a broad range of organic reactions.

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Cerium-containing MCM-41 materials as selective acylation and alkylation catalysts

Cited by 83 publications

References 13 publications

Synthesis, Characterization and Catalysis of Ce-MCM-41

Synthesis, Characterization and Catalysis of Ce-MCM-41

Micro- and mesoporous supports for CO2 methanation catalysts: A comparison between SBA-15, MCM-41 and USY zeolite

Ceria‐Based Solid Catalysts for Organic Chemistry

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