Improvements in acidity for TiO2 and SnO2 via impregnation with MoO3 for the esterification of fatty acids

Almeida, Rusiene M. de; Souza, Felipe Thiago Caldeira de; Júnior, Marcos Antônio Calil; Albuquerque, Nilson José Araújo de; Meneghetti, Simoni Margareti Plentz; Meneghetti, Mário R.

doi:10.1016/j.catcom.2013.12.020

Cited by 41 publications

(11 citation statements)

References 23 publications

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“…De Almeida et al. and Shao et al. recently reported the enhancement of their catalysts acidity when supporting molybdenum oxide on TiO 2 or mesoporous silica, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of oxomolybdate species dispersion on direct methanol oxidation to dimethoxymethane over MoO_x/TiO₂ catalysts

Faye¹,

Capron

Takahashi³

et al. 2014

Energy Science & Engineering

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The one-step selective oxidation of methanol to dimethoxymethane (DMM) was demonstrated over titania-supported molybdenum oxide catalysts, containing different amounts of molybdenum and prepared using two different impregnation techniques, namely wet impregnation and incipient wetness impregnation. The corresponding catalysts exhibited both acidic and redox properties, which are necessary for the oxidation of methanol to formaldehyde with subsequent condensation of the latter with excess methanol to finally yield DMM. The formation of well-dispersed polyoxomolybdate species on the catalyst surface was evidenced using IR-Raman, X-ray diffraction, and nitrogen physisorption. Varying the amount of these polyoxomolydate species was associated with a modulation of the acidic and redox properties, as shown by NH 3 -TPD and H 2 -TPR. With respect to the catalytic performances, the best balance between acid and redox properties was observed over the samples containing 8 wt.% Mo, which corresponds to a theoretical MoO x species coverage close to a monolayer.

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“…De Almeida et al. and Shao et al. recently reported the enhancement of their catalysts acidity when supporting molybdenum oxide on TiO 2 or mesoporous silica, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of oxomolybdate species dispersion on direct methanol oxidation to dimethoxymethane over MoO_x/TiO₂ catalysts

Faye¹,

Capron

Takahashi³

et al. 2014

Energy Science & Engineering

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“…Homogeneous acidic catalysts(HoACs) and HeACs are used in industrial-scale ester production. They used in the esterification reactions catalyze the reaction by giving a proton to the carboxylic acid(R-COOH) (Maki-Arvela et al, 1999;De Almeida et al, 2014). Homogeneous catalysts(HoCs) are generally used in esterification reactions(ERs) ( Yin et al, 2013) such as HI(hydriodic acid), H2SO4(sulfuric acid), HCI(hydrochloric acid) and NaOH(sodium hydroxide), and (Yin et al, 2013;Helminen et al, 1998;Poonjarersilp et al, 2014;Oliviera et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Fe/SBA-15 Heterogeneous Catalysts for Methyl Acetate Production

Şimşek¹

2021

European Journal of Science and Technology

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In the present study, the synthesis of SBA-15 (Santa Barbara Amorphous) support material(SPm) was initially carried out with the method determined according to the literature research. The catalytic property of SBA-15 was imparted by the hydrothermal method (HtM), different from the traditionally applied impregnation method. In this method, the active substance (iron III oxide; Fe2O3) was added to the solution during the synthesis of the SPm. The amount of active substance in the synthesized catalysts was calculated based on the mass ratios of silicon (Si) in SBA-15 and iron (Fe) in Fe2O3. The active substance ratios in the catalysts were determined as 10, 25% Fe/Si. The activities of Fe/SBA-15 catalysts were tested in methyl acetate production (MAP). MAP reaction experiments were carried out in the presence of 0.4g catalyst (Fe/SBA-15), 373K, in autogenous pressure and 2/1 Acetic acid(AA)/methanol(MeOH) feed rate for 48 hours. The effects of active substance loading rate on AA conversion were determined. The structural properties of Fe/SBA-15 catalysts were investigated by XRD, BET, FTIR/DRIFT, SEM/EDX, and MAPPING analysis methods.

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“…We inferred that the low pH value in the synthesis solution caused more plate-like MoO 3 to form, which increased the acidity of the catalyst because MoO 3 has strong acidity than iron molybdate. 35–37 …”

Section: Resultsmentioning

confidence: 99%

Effect of synthesis pH on the structure and catalytic properties of FeMo catalysts

Zhang

Han

2019

RSC Adv.

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Improvements in acidity for TiO2 and SnO2 via impregnation with MoO3 for the esterification of fatty acids

Cited by 41 publications

References 23 publications

Effect of oxomolybdate species dispersion on direct methanol oxidation to dimethoxymethane over MoO_x/TiO₂ catalysts

Effect of oxomolybdate species dispersion on direct methanol oxidation to dimethoxymethane over MoO_x/TiO₂ catalysts

Synthesis and Characterization of Fe/SBA-15 Heterogeneous Catalysts for Methyl Acetate Production

Effect of synthesis pH on the structure and catalytic properties of FeMo catalysts

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Improvements in acidity for TiO2 and SnO2 via impregnation with MoO3 for the esterification of fatty acids

Cited by 41 publications

References 23 publications

Effect of oxomolybdate species dispersion on direct methanol oxidation to dimethoxymethane over MoOx/TiO2 catalysts

Effect of oxomolybdate species dispersion on direct methanol oxidation to dimethoxymethane over MoOx/TiO2 catalysts

Synthesis and Characterization of Fe/SBA-15 Heterogeneous Catalysts for Methyl Acetate Production

Effect of synthesis pH on the structure and catalytic properties of FeMo catalysts

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Product

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Effect of oxomolybdate species dispersion on direct methanol oxidation to dimethoxymethane over MoO_x/TiO₂ catalysts

Effect of oxomolybdate species dispersion on direct methanol oxidation to dimethoxymethane over MoO_x/TiO₂ catalysts