Generation of Singlet Molecular Oxygen from H2O2 with Molybdate-Exchanged Layered Double Hydroxides: Effects of Catalyst Composition and Reaction Conditions

Laar, F.M.P.R. van; Vos, Dirk De; Pierard, Frédéric; Mesmaeker, Andrée Kirsch-De; Fiermans, L.; Jacobs, Pierre

doi:10.1006/jcat.2000.3070

Cited by 57 publications

(37 citation statements)

References 34 publications

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“…The Raman spectra revealed the presence of the most intense absorption band corresponding to Mo-O symmetrical stretching vibration in MoO 4 2-at 896 cm -1 and the one corresponding to d(Mo=O) in MoO 4 2-at 320 cm -1 [21,26] in all the calcined samples, even if in the case of Mo-CHT HS-(NH4)6Mo7O24 (Fig. 6c) the intensity of these bands was much lower.…”

Section: Resultsmentioning

confidence: 89%

“…Three Mo-containing HTlcs samples (Mo-HT) were obtained at constant pH 10 following two different procedures: ionic exchange (IE) without the presence of an organic swelling agent, or coprecipitation at high supersaturation using Mg(NO 3 ) 2 , For the preparation by ionic exchange according to the method previously developed by Kwon [29], an amount of Na 2 MoO 4 solution (7.5910 -3 M) containing a number of MoO 4 2-anions equal to the half of the anionic exchange capacity (AEC) of a parent hydrotalcite Mg 3 Al(OH) 8 (NO 3 )Á2H 2 O (HT-NO 3 ) synthesized by coprecipitation at constant pH = 10 and low supersaturation [11,26] had been used. The pH was adjusted to 10 using a 1.5 M aqueous solution of NaOH.…”

Section: Preparation Of the Catalystsmentioning

confidence: 99%

“…Generally, these solids were prepared at low pH values in order to stabilize the Mo 7 O 24 6-anions. Recently, several methods have been developed for producing hydrotalcite-like materials containing molybdate (MoO 4 2-) anions (Mo-HT), which are good catalysts for selective oxidations under mild conditions [26][27][28]. The dispersion, the accessibility and the coordination state of Mo in the active sites as well as its redox behavior are among the factors that influence strongly the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation of tert-butanethiol with air using Mo-containing hydrotalcite-like compounds and their derived mixed oxides as catalysts

Zăvoianu

Cruceanu

Pavel

et al. 2011

Reac Kinet Mech Cat

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This contribution presents several aspects concerning the production and characterization of hydrotalcite-like compounds containing Mo-species in the interlayer region (Mo-HT), the corresponding derived mixed oxides (Mo-CHT) and their catalytic activity in the demercaptanization of gasoline contaminated by tertbutanethiol. Mo-HT samples were obtained using two different molybdenum sources, e.g. Na 2 MoO 4 or (NH 4 ) 6 Mo 7 O 24 and two preparation procedures: (i) ionic exchange and (ii) coprecipitation at pH 10 under high supersaturation. The derived mixed oxides were obtained by calcination at 450°C during 24 h. The solids have been characterized by chemical analysis, TG/DTA, XRD, SEM-EDX, FTIR, DR-UV-Vis and Raman spectroscopy as well as determination of base sites. The specific area of the solids was determined using the BET method. The best catalysts were found to be those containing higher amounts of Mo species with tetrahedral coordination obtained by calcination of the Mo-HT precursors prepared at pH 10, either by ionic exchange or by co-precipitation using Na 2 MoO 4 as a molybdenum source. Meanwhile, the catalysts containing mainly octahedrally coordinated Mo species (obtained from Mo-HT prepared at pH 10 using (NH 4 ) 6 Mo 7 O 24 Á6H 2 O as molybdenum source) were characterized by a higher concentration of molybdenum species with octahedral coordination, lower number of base sites, smaller surface area, and a poor catalytic activity.

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Section: Resultsmentioning

confidence: 89%

Section: Preparation Of the Catalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidation of tert-butanethiol with air using Mo-containing hydrotalcite-like compounds and their derived mixed oxides as catalysts

Zăvoianu

Cruceanu

Pavel

et al. 2011

Reac Kinet Mech Cat

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“…The surface area was then calculated using BET equation. The basicity analyses of the respective catalysts were determined by benzoic acid titration using the following indicators: bromothymol blue (H -= 7.2), phenolphthalein (H -= 8.2-9.8), 2,4-dinitroaniline (H -= 15.0) and 4-nitroaniline (H -= 18.4) [24,25].…”

Section: Characterizationsmentioning

confidence: 99%

Transesterification of palm cooking oil using barium-containing titanates and their sodium doped derivatives

Chew

Tan

Bakar

et al. 2016

Int J Energy Environ Eng

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BaTiO 3 , Ba 2 NiTi 5 O 13 and their Na-doped analogues were successfully synthesized via sol-gel and calcination methods. The surface properties of the prepared catalysts were characterized by scanning electron microscopy and nitrogen adsorption-desorption analysis while the basicity was determined by benzoic acid titration. The catalytic activity of the Ba-based catalysts was verified in transesterification of palm cooking oil with methanol. The optimization study was conducted by varying the oil:-methanol ratio, catalyst loading, reaction temperature and duration. The highest methyl ester (ME) yield was *95% for 5 wt/v% Na-Ba 2 NiTi 5 O 13 at a methanol to oil ratio of 12:1 at 150°C for 2 h.

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“…[83] With the homogeneous Mo system, the theoretical yield of 100% based on H 2 [84] 22 Moreover, the complete retention of the Mo by the LDH, and the reusability of the catalyst have been established. [86] Singlet oxygen can also be generated by peroxotungstates, either in solution, or exchanged on an LDH. [84,87] However, epoxidation by peroxoW is a potential side reaction, making this system less useful than Mo.…”

mentioning

confidence: 99%

Solid Materials as Sources for Synthetically Useful Singlet Oxygen

et al. 2004

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Generation of Singlet Molecular Oxygen from H2O2 with Molybdate-Exchanged Layered Double Hydroxides: Effects of Catalyst Composition and Reaction Conditions

Cited by 57 publications

References 34 publications

Oxidation of tert-butanethiol with air using Mo-containing hydrotalcite-like compounds and their derived mixed oxides as catalysts

Oxidation of tert-butanethiol with air using Mo-containing hydrotalcite-like compounds and their derived mixed oxides as catalysts

Transesterification of palm cooking oil using barium-containing titanates and their sodium doped derivatives

Solid Materials as Sources for Synthetically Useful Singlet Oxygen

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