Kinetics of the vapor-phase oxidation of methyl alcohol on vanadium pentoxide catalyst

Bhattacharyya, Souvik; Janakiram, Kallakuri; Ganguly, N.D.

doi:10.1016/0021-9517(67)90295-3

Cited by 29 publications

(4 citation statements)

References 4 publications

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“…This is further illustrated in Figure S10 in the SM. The reaction rate was assumed to follow (pseudo-)first order kinetics, as reported in the literature [58][59][60][61][62], and the rate constant was calculated from the design equation for a PFR reactor as in Equation (5) [63].…”

Section: Catalytic Activity and Selectivitymentioning

confidence: 99%

Alkali Earth Metal Molybdates as Catalysts for the Selective Oxidation of Methanol to Formaldehyde—Selectivity, Activity, and Stability

et al. 2020

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Alkali earth metal molybdates (MMoO4, M = Mg, Ca, Sr, and Ba) were investigated as catalysts for the selective oxidation of methanol to formaldehyde in the search for more stable alternatives to the current industrial iron molybdate catalyst. The catalysts were prepared by either sol-gel synthesis or co-precipitation with both stoichiometric ratio (Mo:M = 1.0) and 10 mol% to 20 mol% excess Mo (Mo:M = 1.1 to 1.2). The catalysts were characterized by X-ray diffraction (XRD), nitrogen physisorption, Raman spectroscopy, temperature programmed desorption of CO2 (CO2-TPD), and inductively coupled plasma (ICP). The catalytic performance of the catalysts was measured in a lab-scale, packed bed reactor setup by continuous operation for up to 100 h on stream at 400 °C. Initial selectivities towards formaldehyde of above 97% were achieved for all samples with excess molybdenum oxide at MeOH conversions between 5% and 75%. Dimethyl ether (DME) and dimethoxymethane (DMM) were the main byproducts, but CO (0.1%–2.1%) and CO2 (0.1%–0.4%) were also detected. It was found that excess molybdenum oxide evaporated from all the catalysts under operating conditions within 10 to 100 h on stream. No molybdenum evaporation past the point of stoichiometry was detected.

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Section: Catalytic Activity and Selectivitymentioning

confidence: 99%

Alkali Earth Metal Molybdates as Catalysts for the Selective Oxidation of Methanol to Formaldehyde—Selectivity, Activity, and Stability

et al. 2020

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“…Formaldehyde may be synthesized industrially by selective oxidation of methanol over an ironmolybdate/molybdenum oxide (FeMo) catalyst according to: CH3OH + ½O2 → CH2O + H2O (ΔH = -156 kJ/mol) [3]. The reaction is normally carried out in a multitubular reactor (tube length = 1 to 1.5 m) with excess of oxygen (MeOH = 10%, O2 = 10 % in N2) at near atmospheric pressure and 270-400 °C (yield = 88-92 % with complete methanol conversion in a single pass), known as the Formox process [1].…”

Section: Introductionmentioning

confidence: 99%

Deactivation behavior of an iron-molybdate catalyst during selective oxidation of methanol to formaldehyde

Raun

Lundegaard

Chevallier

et al. 2018

Catal. Sci. Technol.

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“…Optimum methanol concentration in air is detected to be 8%. The same twostage redox mechanism that was applied by Bhattacharyya et al (1967) has been considered in this study as well: …”

Section: Metal Oxides As Catalystsmentioning

confidence: 99%

“…Since then, many researchers have investigated the kinetics and mechanism of the reactions that occur on the surface of these metal oxides in the presence of methanol and other materials. In a kinetic study done by Bhattacharyya et al (1967), the methanol oxidation reaction was investigated at 519.15, 537.15, and 554.15 K using vanadium oxide as the catalyst. Based on their study, the Mars-van Krevelen redox mechanism (Mars and van Krevelen 1954) where k 1 and k 2 refer to rate constants for the first and second step, respectively, which were evaluated at each temperature at which the reaction was investigated.…”

Section: Copper and Silver As Catalystsmentioning

confidence: 99%

Critical review and exergy analysis of formaldehyde production processes

Bahmanpour

Hoadley

Tanksale

2014

Reviews in Chemical Engineering

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AbstractFormaldehyde is one of the most important intermediate chemicals and has been produced industrially since 1889. Formaldehyde is a key feedstock in several industries like resins, polymers, adhesives, and paints, making it one of the most valuable chemicals in the world. However, not many studies have been dedicated to reviewing the production of this economically important product. In this review paper, we study the leading commercial processes for formaldehyde production and compare them with recent advancements in catalysis and novel processes. This paper compares, in extensive detail, the reaction mechanisms and kinetics of water ballast process (or BASF process), methanol ballast process, and Formox process. The thermodynamics of the reactions involved in the formaldehyde production process was investigated using HSC Chemistry™ software (Outotec Oyj, Espoo, Finland). Exergy analysis was carried out for the natural gas to methanol process and the methanol ballast process for formaldehyde production. The former process was simulated using Aspen HYSYS™ and the latter using Aspen Plus™ software (Aspen technology, Burlington, MA, USA). The yield and product specifications from the simulation results closely matched with published experimental data. The exergy efficiencies of the natural gas to synthesis gas

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Kinetics of the vapor-phase oxidation of methyl alcohol on vanadium pentoxide catalyst

Cited by 29 publications

References 4 publications

Alkali Earth Metal Molybdates as Catalysts for the Selective Oxidation of Methanol to Formaldehyde—Selectivity, Activity, and Stability

Alkali Earth Metal Molybdates as Catalysts for the Selective Oxidation of Methanol to Formaldehyde—Selectivity, Activity, and Stability

Deactivation behavior of an iron-molybdate catalyst during selective oxidation of methanol to formaldehyde

Critical review and exergy analysis of formaldehyde production processes

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