scholarly journals Propane Oxidative Dehydrogenation on Vanadium-Based Catalysts under Oxygen-Free Atmospheres

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 418 ◽  
Author(s):  
Samira Rostom ◽  
Hugo de Lasa
Keyword(s):  
Carbon Dioxide ◽  
Kinetic Parameters ◽  
Gas Phase ◽  
Oxidative Dehydrogenation ◽  
Critical Review ◽  
Reaction Mechanisms ◽  
Environmental Footprint ◽  
Propane Oxidative Dehydrogenation ◽  
Vanadium Based Catalysts ◽  
Made In

Catalytic propane oxidative dehydrogenation (PODH) in the absence of gas phase oxygen is a promising approach for propylene manufacturing. PODH can overcome the issues of over-oxidation, which lower propylene selectivity. PODH has a reduced environmental footprint when compared with conventional oxidative dehydrogenation, which uses molecular oxygen and/or carbon dioxide. This review discusses both the stoichiometry and the thermodynamics of PODH under both oxygen-rich and oxygen-free atmospheres. This article provides a critical review of the promising PODH approach, while also considering vanadium-based catalysts, with lattice oxygen being the only oxygen source. Furthermore, this critical review focuses on the advances that were made in the 2010–2018 period, while considering vanadium-based catalysts, their reaction mechanisms and performances and their postulated kinetics. The resulting kinetic parameters at selected PODH conditions are also addressed.

Kinetic modelling of the gas phase ethane and propane oxidative dehydrogenation

2006 ◽  
Vol 112 (1-4) ◽  
pp. 53-59 ◽  
Author(s):  
M. Machli ◽  
C. Boudouris ◽  
S. Gaab ◽  
J. Find ◽  
A.A. Lemonidou ◽  
...  
Keyword(s):  
Gas Phase ◽  
Oxidative Dehydrogenation ◽  
Kinetic Modelling ◽  
Propane Oxidative Dehydrogenation

scholarly journals Radical Chemistry and Reaction Mechanisms of Propane Oxidative Dehydrogenation over Hexagonal Boron Nitride Catalysts

2020 ◽  
Vol 132 (21) ◽  
pp. 8119-8123 ◽  
Author(s):  
Xuanyu Zhang ◽  
Rui You ◽  
Zeyue Wei ◽  
Xiao Jiang ◽  
Jiuzhong Yang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Oxidative Dehydrogenation ◽  
Reaction Mechanisms ◽  
Hexagonal Boron Nitride ◽  
Propane Oxidative Dehydrogenation ◽  
Radical Chemistry

AN INVESTIGATION OF THE GAS-PHASE OXIDATION OF ACETALDEHYDE BY MEANS OF A RAPID-SCANNING MASS SPECTROMETER

1957 ◽  
Vol 35 (2) ◽  
pp. 115-123 ◽  
Author(s):  
L. P. Blanchard ◽  
J. B. Farmer ◽  
C. Ouellet
Keyword(s):  
Carbon Dioxide ◽  
Induction Period ◽  
Gas Phase ◽  
Mass Spectrometer ◽  
Peracetic Acid ◽  
Reaction Mechanisms ◽  
Continuous Sampling ◽  
Phase Oxidation ◽  
Gas Phase Oxidation ◽  
Rapid Scanning

A mass spectrometer equipped for continuous sampling and capable of producing 60 spectra per second has been used to follow the oxidation of acetaldehyde at temperatures in the region of 250 °C. In normal slow oxidation peracetic acid was formed and then decomposed into carbon dioxide, methanol, and water. Under flame conditions peracetic acid built up in an autocatalytic manner during the induction period and vanished suddenly at the onset of the flame. Possible reaction mechanisms are discussed. Temperature surges during cool and hot flames are estimated.

Catalytic performance and stability of Fe-doped CeO2 in propane oxidative dehydrogenation using carbon dioxide as an oxidant

2020 ◽  
Vol 10 (13) ◽  
pp. 4362-4372
Author(s):  
Hedun Wang ◽  
George Tsilomelekis
Keyword(s):  
Carbon Dioxide ◽  
Oxidative Dehydrogenation ◽  
Catalytic Performance ◽  
Propane Oxidative Dehydrogenation ◽  
Doped Ceo2

Propane oxidative dehydrogenation (ODH) in the presence of CO2 was investigated over a series of Fe-doped CeO2 catalysts.

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.

Kinetics of temperature-programmed reactivation of a hydrodesulphurization catalyst

1983 ◽  
Vol 48 (12) ◽  
pp. 3340-3355 ◽  
Author(s):  
Pavel Fott ◽  
Pavel Šebesta
Keyword(s):  
Carbon Dioxide ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thin Layer ◽  
Kinetic Parameters ◽  
Diffusion Region ◽  
Reaction Heat ◽  
Gaseous Products ◽  
Temperature Programmed ◽  
Kinetics Of

The kinetic parameters of reactivation of a carbonized hydrodesulphurization (HDS) catalyst by air were evaluated from combined thermogravimetric (TG) and differential thermal analysis (DTA) data. In addition, the gaseous products leaving a temperature-programmed reactor with a thin layer of catalyst were analyzed chromatographically. Two exothermic processes were found to take part in the reactivation, and their kinetics were described by 1st order equations. In the first process (180-400 °C), sulphur in Co and Mo sulphides is oxidized to sulphur dioxide; in the second process (300-540 °C), in which the essential portion of heat is produced, the deposited carbon is oxidized to give predominantly carbon dioxide. If the reaction heat is not removed efficiently enough, ignition of the catalyst takes place, which is associated with a transition to the diffusion region. The application of the obtained kinetic parameters to modelling a temperature-programmed reactivation is illustrated on the case of a single particle.

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