Aluminum incorporation in MCM-41 mesoporous molecular sieves

Busio, Mcm Marc; Jänchen, J.; Hooff, van Jhc Jan

doi:10.1016/0927-6513(95)00063-1

Cited by 114 publications

(58 citation statements)

References 7 publications

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“…3. The nitrogen adsorption-desorption isotherms of Ti-MCM-41 before and after hydrothermal treatment are closer to each other as compared with the MCM-41 isotherms [14,15]. Before hydrothermal treatment, MCM-41 and Ti-MCM-41…”

Section: Bet Analysismentioning

confidence: 74%

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Characterization of hydrothermally treated MCM-41 and Ti-MCM-41 molecular sieves

et al. 2004

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Section: Bet Analysismentioning

confidence: 74%

“…TGA analysis of MCM-41 materials exhibits distinct weight losses that depend, in part, on the composition of the sample [15,16]. The TGA and DTA plots of MCM-41 are shown in Fig.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Characterization of hydrothermally treated MCM-41 and Ti-MCM-41 molecular sieves

et al. 2004

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“…For high Al contents, most Al atoms are anchored on the outer surface rather than incorporated into the framework of MCM-41 [27] and the growing part of the acid sites (tetrahedral Al 3+ ) might be neutralized by non-framework cationic Al species which blocks the strong acid sites. [28] In addition, increasing the Al content could cause some deterioration in the pore structure as well as in the texture of the mesoporous material, [29] which is clearly observed from the Figure 1 a and harmful for the activity of the catalyst. A similar result has been obtained by Li et al during the Ullmann reaction over a Pd-containing Al-MCM-41 catalyst.…”

Section: Effect Of Si/al Ratiomentioning

confidence: 96%

Hydrogenation of Phenol in Supercritical Carbon Dioxide Catalyzed by Palladium Supported on Al‐MCM‐41: A Facile Route for One‐Pot Cyclohexanone Formation

Chatterjee¹,

Kawanami²,

Sato³

et al. 2009

Adv Synth Catal

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The hydrogenation of phenol has been carried out in supercritical carbon dioxide (scCO 2 ) under very mild reaction conditions at the temperature of 50 8C over palladium supported Al-MCM-41 (metal loading~1%). This palladium catalyst is shown to be highly active and promotes the selective formation of cyclohexanone (~98%), an industrially important compound, in a "one-pot" way. The effects of different variables like carbon dioxide and hydrogen pressure, reaction time and also silica/alumina ratio of the MCM-41 support along with palladium dispersion are presented and discussed. The pressure effect of carbon dioxide is significantly prominent in terms of conversion and cyclohexanone selectivity. Moreover, the silica/alumina ratio was also found to be an important parameter to enhance the effectiveness of the catalyst as it exhibits a remarkable increase in phenol conversion from 20.6% to 98.4% as the support changes from only silica MCM-41 to Al-MCM-41. A plausible mechanism for the hydrogenation of phenol to cyclohexanone over the palladium catalyst has been proposed. The proposition is validated by transition state calculations using density functional theory (DFT), which reveal that cyclohexanone is a favorable product and stabilized by < 19 kcal mol À1 over cyclohexanol in scCO 2 medium. Under similar reaction conditions, phenol hydrogenation was also carried out with rhodium, supported on Al-MCM-41. In contrast to the palladium catalyst, a mixture of cyclohexanone (57.8%) and cyclohexanol (42.2%) was formed. Detailed characterization by X-ray diffraction and transmission electron microscopy confirmed the presence of metal nanoparticles (palladium and rhodium) between 10-20 nm. Both the catalysts exhibit strikingly different product distributions in solventless conditions compared to scCO 2 . This method can also be successfully applied to the other hydroxylated aromatic compounds.

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“…From the catalytic point of view, the amount of 4-coordinated Al species remained in the walls after calcination is the most important for the catalysis [3]. NMR results showed that 4-coordinated Al either became distorted or was removed from the aluminosilicate structure [30,[33][34][35].…”

Section: Al-mcm-41mentioning

confidence: 96%

Mesoporous Solid Acid Catalysts

2010

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Solid acids have been employed as one of the most important catalysts for chemical processes. However, relatively low surface area and small micropores of conventional solid acids have strongly limited their practical applications. This article systemically reviews the synthesis and catalysis performance of mesoporous solid acids including (1) mesoporous aluminosilicates, (2) mesoporous zeolites, (3) mesoporous sulfated zirconia, (4) mesoporous hybrid inorganic-organic materials, and (5) mesoporous resins.

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Aluminum incorporation in MCM-41 mesoporous molecular sieves

Cited by 114 publications

References 7 publications

Characterization of hydrothermally treated MCM-41 and Ti-MCM-41 molecular sieves

Characterization of hydrothermally treated MCM-41 and Ti-MCM-41 molecular sieves

Hydrogenation of Phenol in Supercritical Carbon Dioxide Catalyzed by Palladium Supported on Al‐MCM‐41: A Facile Route for One‐Pot Cyclohexanone Formation

Mesoporous Solid Acid Catalysts

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