The study of selective oxidation of propylene on complex oxides by means of temperature-programmed desorption

Krenzke, L. D.; Keulks, George W.; Sklyarov, A.; Firsova, A. A.; Kutirev, M.Yu.; Margolis, L. Ya.; Крылов, О. В.

doi:10.1016/0021-9517(78)90345-7

Cited by 19 publications

(5 citation statements)

References 9 publications

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“…His interpretation was that the catalyst surface was essentially covered by chemisorb C3=, NH3, and acrylonitrile. Krenzke et al (1978) demonstrated that the surface of an SbSn oxide catalyst is indeed covered by propylene and acrolein or one of its surface precursors. Desorption of acrolein was identified by them as the rate-controlling step.…”

Section: Interpretation Of Resultsmentioning

confidence: 99%

“…If the surface species is primarily propylene and/or the allylic intermediate rather than acrolein, the observations of Krenzke et al (1978) could be interpreted by a diffusional rate-controlling step such as surface diffusion of allyl species from an Sb5+/Sb4+ site associated with a nucloephilic oxygen were dehydrogenation of C3= has occurred to a site associated with an electrophilic oxygen probably as a covalent bonded oxygen. This sequence has been proposed at different levels of detail by Godin et al (1968), Crozat and Germain (1973), Sala and Trifiro (1976), and Sokolovskii and Bulgakov (1977).…”

Section: Interpretation Of Resultsmentioning

confidence: 99%

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Influence of composition modulation on product yields and selectivity in the partial oxidation of propylene over an antimony-tin oxide catalyst

Silveston¹,

Forissier²

1985

Ind. Eng. Chem. Proc. Des. Dev.

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Ind. Eng. Chem. Process Des. Dev. 1985, 24, 320-325 Hd = gap between wedge shaped disks at R = Rd, m L = length of parallel plates, m m = power law model parameter, N sn/m2 N = frequency of disk rotation, rev/s n = power law model parameter (exponent) P = pressure, N/m2 pw = specific power, J/m3 Pw = power, J/s q = volumetric flow rate per unit width, m2/s Q = volumetric flow rate, m3/s Qd = drag flow rate in parallel disk chambers, m3/s Qh = drag flow rate in wedge shaped chamber, m3/s Q = pressure flow rate in parallel disk chambers, m3/s QFP = pressure flow rate in wedge shaped chambers, m3/s R = radius, m R , = shaft radius, m Rd = disk top radius, m s = l / n f = mean residence time, s V, = plate velocity, tangential disk top velocity, m/s i. = rate of deformation tensor, AP = pressure rise, N/m2 (discharge pressure less inlet AT, = adiabatic temperature rise, K t = fraction of chamber circumference filled with liquid 0 = angular coordinate, rad (Y = R,/& pressure) = my"-l, non-Newtonian viscosity, N s/m2 p = Newtonian viscosity, N s/mz T = torque, N-m T = shear stress tensor, N/mZ Literature Cited Bouchez, D.; Faure, A.; Scherer, G.; Tranie, L.Composition modulation has been studied by the oxidation of propylene to acrolein over a catalyst composed of a solid solution of antimony oxide in tin oxide. Modulation consists of periodically varying the partial pressures of propylene and oxygen in a square wave pattern so as to maintain a constant time-averaged feed composition.Half-periods were of equal duration. Selectivity to acrolein was found to increase substantlalty, but dependence of the increase on amplitude and period coukl not be ascertained. Yield of acrolein decreased with,composition modulation compared with steady-state operation at the same mean feed composition. Amplitude of the square wave was found to be important, but period affected the results just slightly. Product changes with time following a composition switch are used to comment critically on reaction pathway and rate-controlling step proposals in the literature.Thermal conductivity coefficients of coal-derived liquids and petroleum fractions are calculated by an extended corresponding states, conformal solution technique. The method requires as input pseudocritical parameters, molecular weight and acentric factor, and a pseudddeal gas heat capacity for each pseudocomponent or fraction. These quantities are estimated here from the mean average boiling point and specific gravity of the fractions using the techniques proposed by Riazi-Daubert, Kesler-Lee, and Winn: the relationship between the estimated conductivity and the choice of the method is noted. Predicted thermal conductivities are compared with data for three coal liquid samples measured at the Colorado School of Mines and with literature data. Agreement between prediction and experiment is generally within 10 %, depending on the method used to calculate the input parameters. Some literature petroleum fractions data are also compared with the model. Again, agreement is within...

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Section: Interpretation Of Resultsmentioning

confidence: 99%

Section: Interpretation Of Resultsmentioning

confidence: 99%

Influence of composition modulation on product yields and selectivity in the partial oxidation of propylene over an antimony-tin oxide catalyst

Silveston¹,

Forissier²

1985

Ind. Eng. Chem. Proc. Des. Dev.

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“…Acrolein is an important product from the dehydration of glycerol. It is currently produced by the selective oxidation of propylene . Besides being used in the synthesis of acrylic acid, acrolein is also needed in the synthesis of dl -methionine, which is an essential amino acid …”

Section: Introductionmentioning

confidence: 99%

“…It is currently produced by the selective oxidation of propylene. 3 Besides being used in the synthesis of acrylic acid, 4 acrolein is also needed in the synthesis of DLmethionine, which is an essential amino acid. 5 Many studies have been performed on the dehydration of glycerol, but controlling the selectivity of this reaction remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Role of Lewis and Brønsted Acid Sites in the Dehydration of Glycerol over Niobia

et al. 2014

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The role of Lewis and Brønsted sites in the dehydration of glycerol on niobium oxide and Na+-exchanged niobium oxide is investigated using FTIR spectroscopy supported by DFT calculations. Glycerol is impregnated on the catalysts at room temperature using an ex-situ method. Under high vacuum conditions, glycerol forms a stable multidentate alkoxy species through its primary hydroxyl groups with the Lewis sites. When coordinated this way, the primary C–O bonds are polarized, favoring dehydration in this position to form hydroxyacetone. In contrast, dehydration of the secondary alcohol group is kinetically favored over Brønsted acid sites in the absence of steric constraints. The primary product of this reaction, 1,3-propenediol, is further dehydrated to acrolein. When more than a monolayer of glycerol is impregnated on niobia, monoaromatic compounds are also formed on the surface upon heating.

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“…67 A series of the catalysts of the oxidation of propene to acrolein described in the literature have been compared using the thermal desorption method: Co6Moi 2 Bio.5Feo.7sO x , Bi 2 MoC>6, 5 at.% Sb in SnO 2 , USb 3 O 3 , BiFeMoO*, Bi 3 FeMo 2 O x , Cu 2 O, C0M004. 68 It was established that the active intermediates arising from propene can be converted into acrolein via two pathways: they interact either with the oxygen of the catalyst lattice or with the adsorbed oxygen. The rate of the selective oxidation of propene on modified cobalt molybdate is determined by the acrolein desorption stage.…”

Section: H Omentioning

confidence: 99%

Methods of synthesis of acrolein and its α-substituted derivatives

Keiko¹,

Воронков²

1993

Russ. Chem. Rev.

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The study of selective oxidation of propylene on complex oxides by means of temperature-programmed desorption

Cited by 19 publications

References 9 publications

Influence of composition modulation on product yields and selectivity in the partial oxidation of propylene over an antimony-tin oxide catalyst

Influence of composition modulation on product yields and selectivity in the partial oxidation of propylene over an antimony-tin oxide catalyst

Role of Lewis and Brønsted Acid Sites in the Dehydration of Glycerol over Niobia

Methods of synthesis of acrolein and its α-substituted derivatives

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