Catalytic Activity of Cobalt Containing MCM-41 and HMS in Liquid Phase Oxidation of Diphenylmethane

Bhoware, Shrikant S.; Kamble, K.R.; Singh, Anand

doi:10.1007/s10562-009-0162-1

Cited by 18 publications

(11 citation statements)

References 23 publications

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“…Interestingly the reaction proceeded in a remarkable manner by using the siliceous either MCM-41 or MCM-48 with a substrate conversion of > 80 % within 15 min of reaction and selective towards 2-methoxybenzoquinone (Table-2, entry 2). Recently, we have observed that mesoporous silicas can catalyse the reaction yielding selectively methoxybenzoquinone [20]. Further we have observed that apocynol (1) is susceptible to oxidation in presence of H 2 O 2 alone and the reaction proceeds in an uncontrolled and non-selective manner resulting in several high molecular weight products (not identified).…”

Section: Methodsmentioning

confidence: 99%

“…It is quite understandable that hydrogen peroxide can be activated either by cobalt [20] or silanol groups [44] 41 containing silanol groups as well as Co(II) yields mixture of products 2 and 3. Increment of OH-groups with increase in cobalt content in CoMCM-41 can lead to proton extraction both from benzylic carbon as well as from phenolic substrate.…”

Section: Catalyst Ch Cn H Omentioning

confidence: 99%

“…In particular, the unidimensional tuneable regular pore channel (2-10 nm), large surface area (~1000 m 2 g -1 ), good thermal stability as well as a high density of surface silanol (hydroxyl) groups (~30-40 %), made this mesoporous material as a potential catalytic system involving bulky organic substrate [17,18]. It has been demonstrated that CoMCM-41 and CoMCM-48 shows a good catalytic ability for oxidation of variety of organic substrates including FischerTropsch synthesis [19][20][21].…”

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confidence: 99%

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Catalytic Conversion of Lignin: Studies on Oxidation of Lignin Model Phenolic Monomer over CoMCM-41 and CoMCM-48 Catalysts

Sadual¹,

Badamali²

2018

Asian J. Chem.

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INTRODUCTIONLignin is an integral component of plants and is most abundant aromatic biopolymer in earth which can serve as a renewable resource of chemical feedstock. It is suggested that catalytic oxidation of lignin or lignin derived fragments is interesting as it is expected to yield functionalized chemicals which can be employed in fine chemical synthesis [1]. In this subject, several reports have been appeared in literature largely focused on catalytic reactions of lignin model compounds which could provide useful information for the development of selective and high yield processes of lignin oxidation namely the conversion of lignin to aromatic monomers catalyzed by triflic acid [2], depolymerization of oxidized lignin to aromatics by formic acid [3], oxidation of phenolic and non-phenolic compounds in presence of metal chlorides in ionic liquid medium [4] are some of the significant achievements in the area of lignin valorization. Among the lignin model phenolic monomers, apocynol, 1-(4-hydroxy-3-methoxyphenoxy)-ethanol is commonly studied over many catalysts. Recently, much attention is focussed on the catalytic oxidation of lignin derived fragments to fine chemicals. Wozniak et al. [5] have studied the liquid phase oxidation of apocynol over potassium nitrosodisulfonate (Fremy's salt) and corresponding benzo- The present study focussed on investigation of the potentiality of cobalt containing mesoporous material (M41S) as a robust heterogeneous catalyst for the oxidation of lignin model phenolic compound. Cobalt containing MCM-41 and MCM-48 were prepared under hydrothermal condition and characterized by various spectroscopic and analytical techniques. Formation of well ordered hexagonal and cubic mesopore structures of MCMs, containing cobalt in the silicate framework was inferred from XRD, TG-DTA and N2 adsorption-desorption studies. DR UV-visible spectral analysis revealed existence of Co(II) and Co(III) in the tetrahedral framework. The oxidative ability of CoMCMs were studied for the lignin model phenolic monomer, 1-(4-hydroxy-3-methoxyphenoxy)-ethanol, under mild conditions using environmentally benign H2O2 as the oxidant. The catalytic results showed that under optimum reaction conditions, apocynol undergoes selective oxidation yielding 2-methoxybenzoquinone and acetovanillone. CoMCM-41 was found to be more selective towards acetovanillone, on the contrary, CoMCM-48 was better catalyst for 2-methoxybenzoquinone yield.

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Section: Methodsmentioning

confidence: 99%

Section: Catalyst Ch Cn H Omentioning

confidence: 99%

mentioning

confidence: 99%

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Catalytic Conversion of Lignin: Studies on Oxidation of Lignin Model Phenolic Monomer over CoMCM-41 and CoMCM-48 Catalysts

Sadual¹,

Badamali²

2018

Asian J. Chem.

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“…1 As a consequence, for the past decade much efforts have been made to develop more economic and clean processes for the synthesis of aromatic ketones by the oxidation of aromatics over a variety of heterogeneous catalysts. Up to now, the majority of studies reported the oxidation of diphenylmethane to benzophenone [2][3][4][5][6][7][8][9][10][11][12] and ethylbenzene to acetophenone. [3][4][5][6][12][13][14][15][16][17][18][19] Other aromatics like 4-nitroethylbenzene 3,6 and fluorene 12,[20][21][22] have received much less attention.…”

Section: Introductionmentioning

confidence: 99%

“…MCMs type materials possess characteristic mesoporous structure, large surface area, and high thermal stability, which allow their potential applications in catalysis, adsorbants, and energy conversion. 23,24 Recently, M-MCM-41 (M = Ti, V, Cr), 5 cobalt containing MCM-41, 8,11 Mn-MCM-41, 10,18,19 and Cr-MCM-41 12,13 were prepared and applied to the liquid-phase oxidation of diphenylmethane, ethylbenzene, or 4-nitroethylbenzene with low to moderate catalytic activities. Although vanadium-containing MCM-41 materials have been applied to the oxidation of light alkanes, 25 benzene, 26,27 and styrene, 27 only few studies have been reported for other aromatics so far.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Aromatic Ketones from Aromatic Compounds Using Vanadium‐Containing Mesoporous Silicates

Chen

2012

J Chinese Chemical Soc

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Aromatic ketones were synthesized from aromatic compounds via liquid-phase oxidation at 60°C and 1 atm over vanadium-containing MCM-41 catalysts using a batch reactor. The catalysts were prepared by direct hydrothermal (4V-MCM-41) and wet impregnation (9V/MCM-41) methods. Their physico-chemical properties were determined with various characterization techniques. For the oxidations of all substrates in this work, 4 V-MCM-41 exhibits superior catalytic performance than 9 V/MCM-41 due to its larger values of unit cell parameter, BET surface area, and vanadium dispersion as well as stronger oxidation ability of vanadium-oxygen species. Apparently, the single site, isolated vanadium centers in 4V-MCM-41 possess much higher activity (based on the turnover number) than those containing more vanadium atoms in 9V/MCM-41. In addition, the substrate activities decrease in the order of diphenylmethane > fluorene > 9,10-dihydroanthracene > ethylbenzene ³ 4-nitroethylbenzene, which are attributed to their distinct molecular structures.

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Catalytic oxidative dehydrogenation of ethane using carbon dioxide as a soft oxidant over Co‐HMS catalysts to ethylene

Xiao

Guo

Zhao

et al. 2022

Asia-Pacific J Chem Eng

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In this work, a series of cobalt doped hexagonal mesoporous silica (Co‐HMS) with the different Co content were prepared by direct hydrothermal method and applied to oxidative dehydrogenation (ODH) reaction of ethane with carbon dioxide. Structural and chemical properties of the catalysts were characterized by nitrogen adsorption, X‐ray powder diffraction (XRD), transmission electron microscopy (TEM), electron dispersive spectroscopy (EDS), X‐ray photoelectron spectroscopy (XPS), and Raman and ultraviolet–visible (UV‐vis) spectroscopy. These characterizations showed that cobalt not only entered the framework of Co‐HMS catalysts but also was evenly dispersed in the bulk. The valence state and coordination mode of cobalt played an important role in the whole ODH reaction system of ethane with carbon dioxide. 2% Co‐HMS with dominant Co2+ had the highest conversion of ethane (26.0%). With the different cobalt content in the catalyst, the proportion of Co2+(Td) and Co2+(Oh) is also different. 1% Co‐HMS with more Co2+(Td) performed the highest ethylene selectivity of 86.7%, which was stable during the 10 h reaction time.

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Catalytic Activity of Cobalt Containing MCM-41 and HMS in Liquid Phase Oxidation of Diphenylmethane

Cited by 18 publications

References 23 publications

Catalytic Conversion of Lignin: Studies on Oxidation of Lignin Model Phenolic Monomer over CoMCM-41 and CoMCM-48 Catalysts

Catalytic Conversion of Lignin: Studies on Oxidation of Lignin Model Phenolic Monomer over CoMCM-41 and CoMCM-48 Catalysts

Synthesis of Aromatic Ketones from Aromatic Compounds Using Vanadium‐Containing Mesoporous Silicates

Catalytic oxidative dehydrogenation of ethane using carbon dioxide as a soft oxidant over Co‐HMS catalysts to ethylene

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