V- or Mo-modified niobium catalysts for glycerin conversion reactions in the presence of H2O2

Souza, Juber Pereira de; Mélo, Thaís Lorenzen De; Oliveira, Marcone Augusto Leal de; Paniago, R.; Souza, Patterson P. de; Oliveira, Luiz C.A.

doi:10.1016/j.apcata.2012.07.041

Cited by 13 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The V-doped iron oxide was submitted to hydrogen peroxide treatment to generate more active surface sites according to previously reported protocols. 7 This treatment was done by adding 0.30 g of Fe 2Àx V x O 3 , 4 mL of H 2 O 2 (34% w/w) and 80 mL of water followed by mixing for 30 min to yield Fe…”

Section: Materials Preparationmentioning

confidence: 99%

“…5 In addition, vanadium can be used in electronic devices, ceramic pigments and in catalysis. 6,7 For catalysis, the preparation of vanadium containing materials is accomplished by various methods and has been used in a great variety of reactions, such as reduction or oxidation e.g., via impregnating vanadium oxides of noble metals, such as Rh, Pd, and their thermodynamic study of reductive CO reactions, 8 oxidation of alkanes by metal complexes of vanadium(V) and vanadium(IV) assisted by H 2 O 2 , 9 epoxidation of cyclohexene using metal organic frameworks (MOFs) with vanadium, which has a differentiated structure and porosity, 10 oxidation of textile dye-type molecules using synthetic and natural iron oxide doped with vanadium. [11][12][13][14][15] In this field, the methylene blue dye has been one of the most studied dyes as a model molecule in the oxidation reactions especially using hydrogen peroxide in Fenton reactions 16 including heterogeneous Fenton using different oxides such as Fe 2 O 3 , Fe 3 O 4 , FeOOH, 17,18 composites Fe/Fe 3 O 4 , 19 Fe 3 O 4 /C, 20,21 and oxides doped with different metal atoms such as Ti, Mn, Co and Cr.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanostructured vanadium-doped iron oxide: catalytic oxidation of methylene blue dye

Oliveira

Pereira

et al. 2015

New J. Chem.

View full text Add to dashboard Cite

show abstract

Section: Materials Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanostructured vanadium-doped iron oxide: catalytic oxidation of methylene blue dye

Oliveira

Pereira

et al. 2015

New J. Chem.

View full text Add to dashboard Cite

show abstract

“…The association of the niobium oxide with other metals, such as vanadium or molybdenum, can generate high catalytic activity towards the oxidation of organic compounds. [94] Lacerda et al [95] performed computational studies using T-Nb 2 O 5 and T-Nb 2 O 5 with vanadium doping. It was found that the addition of vanadium helped in promoting acrylic acid production.…”

Section: Nibonium-vanadium Catalyst (Nb-v)mentioning

confidence: 99%

A review on bi/multifunctional catalytic oxydehydration of bioglycerol to acrylic acid: Catalyst type, kinetics, and reaction mechanism

Abdullah

Ahmed

et al. 2021

Can J Chem Eng

View full text Add to dashboard Cite

Acrylic acid, conventionally produced via propylene (non‐renewable fossil fuel route), is an industrially important chemical. The bio‐based feedstock process employing glycerol (a by‐product of biodiesel production) has attracted the attention of researchers due to its non‐polluting and renewable characteristics. Bi/multifunctional catalysts using a combination of zeolites, metal oxides, heteropoly acids, and phosphates have been mainly studied for the glycerol oxydehydration process. Brønsted acid sites favour acrolein generation over Lewis acid sites, whereas the redox sites convert the generated acrolein to acrylic acid. So far, the maximum acrylic acid yields of 60% and 59% have been reported on heteropoly acid and mixed metal oxide catalysts, respectively. Some DFT studies also revealed the deprotonation energy of acid sites and further helped in designing efficient catalysts. Despite these accomplishments, catalyst deactivation because of coking and stability remains a major problem. In this paper, various bi/multifunctional catalysts employed in glycerol oxydehydration to acrylic acid are critically reviewed. Different catalyst forms, preparation techniques, reaction kinetics, reaction mechanisms, deactivation, reactivation, process operating parameters, and sustainability are considered. In addition, the challenges associated with each catalyst type and strategies to overcome low yield, deactivation, and future directions are discussed.

show abstract

“…Many studies have reported utilisation of preformed H 2 O 2 as oxidant for glycerol oxidation. These studies have focussed on a range of different catalysts, including various supported metal catalysts [19][20][21][22][23][24][25] and metal oxides [26][27][28][29][30][31][32][33][34]. McMorn et al [35] assessed metal-doped silicate (containing Ti, V or Fe) and aluminophosphate catalysts (containing Cr, V, Mn or Co) for oxidation of glycerol with H 2 O 2 , reporting low yields of the desired partial oxidation products.…”

Section: Introductionmentioning

confidence: 99%

Ambient base-free glycerol oxidation over bimetallic PdFe/SiO2 by in situ generated active oxygen species

et al. 2021

View full text Add to dashboard Cite

Low temperature oxidation of alcohols over heterogeneous catalysts is exceptionally challenging, particularly under neutral conditions. Herein, we report on an efficient, base-free method to oxidise glycerol over a 0.5%Pd-0.5%Fe/SiO2 catalyst at ambient temperature in the presence of gaseous H2 and O2. The exceptional catalytic performance was attributed to the in situ formation of highly reactive surface-bound oxygenated species, which promote the dehydrogenation on the alcohol. The PdFe bimetallic catalyst was determined to be significantly more active than corresponding monometallic analogues, highlighting the important role both metals have in this oxidative transformation. Fe leaching was confirmed to occur over the course of the reaction but sequestering experiments, involving the addition of bare carbon to the reactions, confirmed that the reaction was predominantly heterogeneous in nature. Investigations with electron paramagnetic resonance spectroscopy suggested that the reactivity in the early stages was mediated by surface-bound reactive oxygen species; no homogeneous radical species were observed in solution. This theory was further evidenced by a direct H2O2 synthesis study, which confirmed that the presence of Fe in the bimetallic catalyst neither improved the synthesis of H2O2 nor promoted its decomposition over the PdFe/SiO2 catalyst.

show abstract

V- or Mo-modified niobium catalysts for glycerin conversion reactions in the presence of H2O2

Cited by 13 publications

References 13 publications

Nanostructured vanadium-doped iron oxide: catalytic oxidation of methylene blue dye

Nanostructured vanadium-doped iron oxide: catalytic oxidation of methylene blue dye

A review on bi/multifunctional catalytic oxydehydration of bioglycerol to acrylic acid: Catalyst type, kinetics, and reaction mechanism

Ambient base-free glycerol oxidation over bimetallic PdFe/SiO2 by in situ generated active oxygen species

Contact Info

Product

Resources

About