Dynamic and Steady State Analysis of Low Temperature Ethane Oxidative Dehydrogenation over Chromia and Chromia-Vanadia Catalysts

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Gulsun Karamullaoglu ◽  
Timur Dogu
Keyword(s):  
Gas Phase ◽  
Oxidative Dehydrogenation ◽  
Mixed Oxide ◽  
Oxide Catalyst ◽  
Feed Ratio ◽  
Mixed Oxide Catalysts ◽  
Mixed Oxide Catalyst ◽  
Dynamic Experiments ◽  
Ethane Oxidative Dehydrogenation ◽  
Ethylene Selectivity

Oxidative dehydrogenation of ethane to ethylene was investigated over Chromia and Cr-V mixed oxide catalysts synthesized following a complexation procedure. With an O2/C2H6 feed ratio of 0.17, Chromia exhibited a total conversion value of about 0.20 at 447°C (at a space time of 0.24 s.g/mL) with an ethylene selectivity of 0.82. Chromia catalyst was more active than Cr-V mixed oxide at temperatures as low as 200°C. Pulse-response experiments carried out with ethane pulses injected into O2-He indicated the presence of at least two different sites for the formation of CO2 and H2O over Chromia catalyst. In the dynamic experiments carried out with the Cr-V mixed oxide catalyst and by injecting O2 pulses into a gas stream containing a mixture of C2H6 and He, formation of CO rather than C2H4 was favored. Results of the dynamic runs carried out without gas phase oxygen strengthened the conclusion of lattice oxygen participation in the selective oxidation of ethane reaction through a redox mechanism.

A high-throughput reactor system for optimization of Mo–V–Nb mixed oxide catalyst composition in ethane ODH

2015 ◽  
Vol 5 (8) ◽  
pp. 4164-4173 ◽  
Author(s):  
Haibo Zhu ◽  
Paco Laveille ◽  
Devon C. Rosenfeld ◽  
Mohamed Nejib Hedhili ◽  
Jean-Marie Basset
Keyword(s):  
Oxidative Dehydrogenation ◽  
High Throughput ◽  
Mixed Oxide ◽  
Oxide Catalyst ◽  
Dehydrogenation Reaction ◽  
Mixed Oxide Catalysts ◽  
Catalyst Composition ◽  
P 75 ◽  
Mixed Oxide Catalyst ◽  
Ethane Oxidative Dehydrogenation

75 Mo–V–Nb mixed oxide catalysts with a broad range of compositions were tested using a high-throughput reactor in order to optimize the composition for the ethane oxidative dehydrogenation reaction.

Oxidative dehydrogenation of ethane over a Mo–V–Nb–Te–O mixed-oxide catalyst in a cyclic mode

2017 ◽  
Vol 58 (2) ◽  
pp. 156-160 ◽  
Author(s):  
I. I. Mishanin ◽  
A. N. Kalenchuk ◽  
K. I. Maslakov ◽  
V. V. Lunin ◽  
A. E. Koklin ◽  
...  
Keyword(s):  
Oxidative Dehydrogenation ◽  
Mixed Oxide ◽  
Oxide Catalyst ◽  
Cyclic Mode ◽  
Oxidative Dehydrogenation Of Ethane ◽  
Mixed Oxide Catalyst

scholarly journals Kinetic Study of Oxidative Dehydrogenation of Ethane over MoVTeNb Mixed-Oxide Catalyst

2013 ◽  
Vol 53 (5) ◽  
pp. 1775-1786 ◽  
Author(s):  
Jaime S. Valente ◽  
R. Quintana-Solórzano ◽  
H. Armendáriz-Herrera ◽  
G. Barragán-Rodríguez ◽  
J. M. López-Nieto
Keyword(s):  
Kinetic Study ◽  
Oxidative Dehydrogenation ◽  
Mixed Oxide ◽  
Oxide Catalyst ◽  
Oxidative Dehydrogenation Of Ethane ◽  
Mixed Oxide Catalyst

Hydrogenolysis of Glycerol in Gas Phase on Cu-Cr Mixed Oxide Catalyst Doped with Ni

2017 ◽  
Vol 68 (5) ◽  
pp. 1118-1121
Author(s):  
Vasile Georgescu ◽  
Casen Panaitescu ◽  
Mihaela Bombos ◽  
Dorin Bombos
Keyword(s):  
Gas Phase ◽  
Propylene Glycol ◽  
Mixed Oxide ◽  
Oxide Catalyst ◽  
Molar Ratio ◽  
Main Reaction ◽  
Reaction Products ◽  
Glycerol Conversion ◽  
Mixed Oxide Catalyst ◽  
Temperature And Pressure

Hydrogenolysis of glycerol was conducted on catalyst of the type mixed oxide of Cu-Cr doped with NiO on g-Al2O3. The prepared catalyst was analyzed by XRD, IR and TPR. Catalytic tests were carried out on a laboratory plant in continuous flow system on a reactor equipped with heating mantle, at molar ratio of glycerol / hydrogen of 1/300, glycerol volume hourly space velocities 1000s-1, temperatures 200-220oC and pressures 3-5 bar. The main reaction products identified were propylene glycol and hydroxyacetone. Glycerol conversion increases with temperature and pressure on ranges of parameters studied. Selectivity to propylene glycol increases with increasing of temperature and pressure and the selectivity to hydroxyacetone decreases with increasing of temperature and pressure on the variation range of the parameters studied.

scholarly journals Revisiting Oxidative Dehydrogenation of Ethane by W Doping into MoVMn Mixed Oxides at Low Temperature

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Mohammed H. Al-Hazmi ◽  
Taiwo Odedairo ◽  
Adel S. Al-Dossari ◽  
YongMan Choi
Keyword(s):  
Oxidative Dehydrogenation ◽  
Oxide Catalyst ◽  
Mixed Oxides ◽  
Catalytic Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxidative Dehydrogenation Of Ethane ◽  
Mixed Oxide Catalyst ◽  
Ethylene Selectivity ◽  
Temperature Programmed

The catalytic performance of MoVMnW mixed oxides was investigated in the oxidative dehydrogenation of ethane at three different reaction temperatures (235, 255, and 275°C) using oxygen as an oxidant. The catalysts were characterized by using X-ray diffraction, temperature-programmed reduction, and scanning electron microscopy. The MoVMnW mixed oxide catalyst showed the 70–90% of ethylene selectivity at the reaction temperatures. However, a significant decrease in the selectivity of ethylene was observed by increasing the reaction temperature from 235°C to 275°C.

The CO Oxidation Mechanism Over Ag-Co And Co-Ce Mixed Oxide Catalysts

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Filiz Balikçi Derekaya ◽  
Cigdem Guldur
Keyword(s):  
Mixed Oxide ◽  
Oxide Catalyst ◽  
Co Adsorption ◽  
Oxidation Mechanism ◽  
Oxide Catalysts ◽  
Oxygen Species ◽  
Surface Oxygen ◽  
Mixed Oxide Catalysts ◽  
Mixed Oxide Catalyst ◽  
Langmuir Hinshelwood Mechanism

Carbonmonoxide oxidation mechanism was studied over the 50/50 Ag-Co and 50/50 Co-Ce mixed oxide catalysts. The temperature programmed methods (TPR-H2 and TPD-CO) were used to characterize the catalysts. FTIR spectrums were collected under different feed conditions in order to determine the reaction mechanism. The carbonates adsorption bands and gas phase CO2 bands were obtained for both of the catalysts. CO linearly bounded to Ag+ sites at 2164 cm-1 and to Co3+ sites at 2105 cm-1 for 50/50 Ag-Co mixed oxide catalyst. CO linearly bounded to Co3+ sites at 2173 cm-1 and 2108 cm-1 for 50/50 Co-Ce mixed oxide catalyst. The CO adsorption studies showed that the CO reacted with surface oxygen species. The CO2 adsorbed on the catalyst surface as surface carbonate species. The oxidation of CO with surface oxygen species is probably via a non-competitive Langmuir-Hinshelwood mechanism on the catalysts.

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