Study of mechanism of oxidation of acrolein on a vanadium-molybdenum oxide catalyst

1979 ◽  
Vol 44 (8) ◽  
pp. 2474-2479 ◽  
Author(s):  
Galya Y. Popova ◽  
Georgii K. Boreskov ◽  
Tamara V. Andrushkevich ◽  
Josef Tichý
Keyword(s):  
Carbon Dioxide ◽  
Acrylic Acid ◽  
Gas Phase ◽  
Molybdenum Oxide ◽  
Partial Oxidation ◽  
Oxide Catalyst ◽  
Pulse Technique ◽  
Redox Mechanism ◽  
Mechanism Of Oxidation

The mechanism of the incorporation of oxygen into the products of acrolein oxidation has been studied by a microcatalytic pulse technique with vibrating catalyst bed. It was found that acrylic acid is formed as the product of partial oxidation by stepwise redox mechanism and that in addition to the catalyst oxygen, also oxygen from the gas phase participates in carbon dioxide formation.

Oxidation of acrolein to acrylic acid on vanadium molybdenum oxide catalyst; The reaction kinetics

1983 ◽  
Vol 48 (3) ◽  
pp. 698-702 ◽  
Author(s):  
Josef Tichý ◽  
Jiří Kůstka ◽  
Jaroslav Machek
Keyword(s):  
Acrylic Acid ◽  
Molybdenum Oxide ◽  
Atmospheric Pressure ◽  
Oxide Catalyst ◽  
Conversion Degree ◽  
Through Flow ◽  
Individual Reaction ◽  
Flow Apparatus ◽  
Kinetics Of ◽  
Integral Reactor

The oxidation kinetics of acrolein have been studied in gas phase in the presence of vanadium molybdenum oxide catalyst. Using a through-flow apparatus with integral reactor, the effect has been studied of concentration of individual reaction components, i.e. acrolein, oxygen, steam and acrylic acid, on conversion degree of acrolein. The measurements have been carried out at atmospheric pressure. For evaluation of the kinetic data measured an equation has been suggested expressing dependence of the oxidation rate on the mentioned parameters.

Determination of rate equations of catalytic oxidation of propene to acrolein and acrylic acid in the gas phase

1986 ◽  
Vol 51 (8) ◽  
pp. 1579-1586
Author(s):  
Jiří Švachula ◽  
Antonín Tockstein ◽  
Josef Tichý
Keyword(s):  
Acrylic Acid ◽  
Catalytic Oxidation ◽  
Gas Phase ◽  
Oxide Catalyst ◽  
Rate Equations ◽  
Nickel Iron ◽  
Cobalt Nickel ◽  
Flow Circulation ◽  
Kinetics Of

The kinetics of propene catalytic oxidation to acrolein and acrylic acid was studied in a flow-circulation reactor over a multicomponent oxide catalyst containing molybdenum, cobalt, nickel, iron, bismuth, and potassium. The rate equations were found for the total formation of acrolein and acrylic acid.

Catalytic Oxidation of Isobutene on a Polycomponent Catalyst

1993 ◽  
Vol 58 (12) ◽  
pp. 2867-2874
Author(s):  
Jaroslav Machek ◽  
Josef Tichý ◽  
Jiří Švachula
Keyword(s):  
Carbon Dioxide ◽  
Acetic Acid ◽  
Gas Phase ◽  
Oxide Catalyst ◽  
Butyl Alcohol ◽  
Oxidation Products ◽  
Simultaneous Increase ◽  
Industrial Preparation ◽  
Phase Oxidation ◽  
Gas Phase Oxidation

The catalytic gas-phase oxidation of isobutene has been studied on polycomponent Mo-Co-Ni-Bi-Fe-K oxide catalyst suitable for industrial preparation of propenal from propene. It has been found that within the temperature interval 290 - 350 °C the main oxidation products are 2-methylpropenal, acetone, 2-methylpropenoic acid, acetic acid and carbon dioxide. A modification of the mentioned catalyst by addition of a further component (W, P, Te, and Zn) showed that zinc increases the conversion of isobutene and at the same time markedly increases its selectivity for 2-methylpropenal, whereas the additions of tungsten and phosphorus decrease the conversion of isobutene with simultaneous increase of selectivity for CO2. If tert-butyl alcohol is used as the starting material instead of isobutene, then the extent of reaction is slightly decreased with simultaneous increase of selectivity for 2-methylpropenal, whereas the selectivities for the acids remain almost unchanged.

Application of Disk Aerators to Recarbonation of Alkaline Wastewater from Wet Gasification of Carbide

1991 ◽  
Vol 24 (7) ◽  
pp. 277-284 ◽  
Author(s):  
E. Gomólka ◽  
B. Gomólka
Keyword(s):  
Carbon Dioxide ◽  
Liquid Phase ◽  
Gas Phase ◽  
Flue Gas ◽  
Carbonic Acid ◽  
Low Cost ◽  
Flue Gases ◽  
Carbon Dioxide Content ◽  
Patent Claim ◽  
Phase Dispersion

Whenever possible, neutralization of alkaline wastewater should involve low-cost acid. It is conventional to make use of carbonic acid produced via the reaction of carbon dioxide (contained in flue gases) with water according to the following equation: Carbon dioxide content in the flue gas stream varies from 10% to 15%. The flue gas stream may either be passed to the wastewater contained in the recarbonizers, or. enter the scrubbers (which are continually sprayed with wastewater) from the bottom in oountercurrent. The reactors, in which recarbonation occurs, have the ability to expand the contact surface between gaseous and liquid phase. This can be achieved by gas phase dispersion in the liquid phase (bubbling), by liquid phase dispersion in the gas phase (spraying), or by bubbling and spraying, and mixing. These concurrent operations are carried out during motion of the disk aerator (which is a patent claim). The authors describe the functioning of the disk aerator, the composition of the wastewater produced during wet gasification of carbide, the chemistry of recarbonation and decarbonation, and the concept of applying the disk aerator so as to make the wastewater fit for reuse (after suitable neutralization) as feeding water in acetylene generators.

Gas phase interaction with catalytic oxidation reactions

1972 ◽  
Vol 326 (1565) ◽  
pp. 215-227 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Maleic Anhydride ◽  
Catalytic Oxidation ◽  
Gas Phase ◽  
Major Part ◽  
Oxidation Reactions ◽  
Mixed Gas ◽  
Kinetics Of ◽  
Oxidation Of Benzene ◽  
Homogeneous Decomposition

Studies of the catalytic oxidation of benzene to maleic anhydride and carbon dioxide over vanadia/molybdena catalysts show that the major part of the reaction involves interacting gas and gas-solid processes. The results are consistent with a mechanism in which a benzeneoxygen adduct is formed catalytically, desorbs and then reacts to give maleic anhydride entirely in the gas phase. On the basis of this proposed mechanism, the kinetics of individual reactions have been investigated in some depth. The over-oxidation of maleic anhydride has been found to be not significant under the conditions of reaction. The kinetic relationships governing the homogeneous decomposition of the adduct and the oxidation of the adduct to maleic anhydride and to carbon dioxide have been established. The results show that essentially all of the anhydride originates from mixed gas-solid/gas reaction while substantial amounts of carbon dioxide are produced entirely catalytically.

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