Nitration of phenol over silica supported H4PW11VO40 catalyst

Kumar, Akshita; Rao, K. T. Venkateswara; Upendar, K.; Sailu, Ch.; Lingaiah, N.; Prasad, P. S. Sai

doi:10.1016/j.catcom.2011.07.030

Cited by 15 publications

(9 citation statements)

References 21 publications

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“…This indicated that the PTA was highly dispersed on the catalyst surface, forming an amorphous surface compound. In addition, there was no diffraction peak in the synthetic Ni-PTA/Al 2 O 3 catalyst sample, indicating that the Keggin structure remains intact 20 . However, Ni-PTA/Al 2 O 3 grain and powder catalysts ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Hydroprocessing of Jatropha Oil for Production of Green Diesel over Non-sulfided Ni-PTA/Al2O3 Catalyst

Liu

Lei

et al. 2015

Sci Rep

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The non-sulfided Ni-PTA/Al2O3 catalyst was developed to produce green diesel from the hydroprocessing of Jatropha oil. The Ni-PTA/Al2O3 catalyst was prepared by one-pot synthesis of Ni/Al2O3 with the co-precipitation method and then impregnanting Ni/Al2O3 with PTA solution. The catalysts were characterized with BET, SEM-EDX, TEM, XRD, XPS, TGA and NH3-TPD. The Ni and W species of the Ni-PTA/Al2O3 catalyst were much more homogeneously distributed on the surface than that of commercial Al2O3. Catalytic performance in the hydroprocessing of Jatropha oil was evaluated by GC. The maximum conversion of Jatropha oil (98.5 wt%) and selectivity of the C15-C18 alkanes fraction (84.5 wt %) occurred at 360 °C, 3.0 MPa, 0.8 h−1. The non-sulfided Ni-PTA/Al2O3 catalyst is more environmentally friendly than the conventional sulfided hydroprocessing catalyst, and it exhibited the highest catalytic activity than the Ni-PTA catalyst supported with commercial Al2O3 grain and Al2O3 powder.

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Section: Resultsmentioning

confidence: 99%

Hydroprocessing of Jatropha Oil for Production of Green Diesel over Non-sulfided Ni-PTA/Al2O3 Catalyst

Liu

Lei

et al. 2015

Sci Rep

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“…Preparation: H 4 PW 11 VO 40 was synthesized by a modification of the method according to the literature available [11].…”

Section: Methodsmentioning

confidence: 99%

A reversible phase transformation monovanadium-substituted Keggin polyoxometalate-based ionic liquid

Huang

et al. 2014

Materials Letters

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“…[44,45] There are af ew catalytic applications reportedo nt he vanadium-substituted tungstophosphoric (PWV) acids such as oxidation of alcohols [46,47] and benzylamine, [48] bromination of olefins, [49] nitration of phenol, [50] and photooxidative degradation of various organic pollutantsi n water. [51][52][53] To the best of our knowledge,h owever,t he PWVacids-catalyzed selectiveo xidation of inactivated hydrocarbons by O 2 under visible light has rarely been reported so far.I ti s also of interest to learn interesting how to mediate the photocatalytic oxidation performance of PWV acids.…”

Section: Introductionmentioning

confidence: 99%

Vanadium‐Substituted Tungstophosphoric Acids as Efficient Catalysts for Visible‐Light‐Driven Oxygenation of Cyclohexane by Dioxygen

Tang

et al. 2015

ChemCatChem

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This paper discloses that the oxygenation of cyclohexane by dioxygen (O2) to cyclohexanol and cyclohexanone over three vanadium‐substituted tungstophosphoric acids (PW11V1, PW10V2, PW9V3) can occur in MeCN under visible‐light irradiation, but provides very low cyclohexane conversion (0.8–2.4 %) with modest cyclohexanone selectivity (51–58.3 %). Importantly, an HCl aqueous solution was found to drastically promote this photooxygenation catalyzed by PW10V2 and especially PW9V3 acids, respectively providing approximately 20.4 and 23.4 % cyclohexane conversion and approximately 82.5 and 87.1 % cyclohexanone selectivity, with a concomitant formation of a small amount of chlorocyclohexane. However, such promoting effect was negligible in the PW11V1‐ photocatalyzed oxygenation and the other acids and the chlorine‐containing salts did not show any promotion effect on the present photocatalysis reaction. Notably, the HCl‐promoted photocatalytic oxygenation was significantly influenced by the amount of water. The cyclohexanone selectivity continuously and significantly increased with water amount, but photooxygenation efficiency drastically decreased if a slight excess amount of water was added. Based on these findings and the UV/Vis spectral and cyclic voltammetric measurements, a free‐radical mechanism initiated by the Cl atoms generated in the present photocatalysis system was proposed.

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Nitration of phenol over silica supported H4PW11VO40 catalyst

Cited by 15 publications

References 21 publications

Hydroprocessing of Jatropha Oil for Production of Green Diesel over Non-sulfided Ni-PTA/Al2O3 Catalyst

Hydroprocessing of Jatropha Oil for Production of Green Diesel over Non-sulfided Ni-PTA/Al2O3 Catalyst

A reversible phase transformation monovanadium-substituted Keggin polyoxometalate-based ionic liquid

Vanadium‐Substituted Tungstophosphoric Acids as Efficient Catalysts for Visible‐Light‐Driven Oxygenation of Cyclohexane by Dioxygen

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