Performance evaluation of a novel reactor configuration for oxidative dehydrogenation of ethane to ethylene

Asadi-Saghandi, Hamid; Karimi-Sabet, Javad

doi:10.1007/s11814-017-0025-1

Cited by 10 publications

(7 citation statements)

References 28 publications

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“…In addition, it consumes carbon dioxide and reduces greenhouse gas emissions [16,17]. Oxydehydrogenation of C 2 H 6 with CO 2 not only has great practical significance for solving the energy crisis, but also mitigates the impact of the greenhouse effect on the global ecological environment [18,19]. The main reaction paths of catalytic oxidized ethane with CO 2 include reforming (reaction 1) and dehydrogenation (reaction 2).…”

Section: Introductionmentioning

confidence: 99%

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

Wang¹,

Wang²,

Yang³

et al. 2020

Comptes Rendus. Chimie

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Single metal catalysts with different active components (La, Sm, Ce) and La loadings (5%, 10%, 15%) were prepared. Oxydehydrogenation of C 2 H 6 with CO 2 over the above catalysts was studied by catalyst activity experiments and characterization tests. The results indicate that the homogeneous reaction of CO 2 /C 2 H 6 is the coupling of ethane pyrolysis and hydrogenolysis. Dehydrogenation has better selectivity than reforming on La/Sm/Ce-based catalysts; Sm exhibits the best catalytic activity due to carbon deposition resistance and many oxygen vacancies. C 2 H 6 conversion on 10% Sm/SiO 2 is 42.75% at 700°C, but C 2 H 4 selectivity is lowest. Because of the existence of Ce 4+ , Ce has the best C 2 H 4 selectivity; it has potential to modify the catalyst, but its catalytic activity is lowest. La shows the best catalytic performance. The activation energy on 10% La/SiO 2 is 83.99 kJ/mol, C 2 H 4 selectivity is 96.84% at 700°C, and its optimum loading is between 10% and 15%.

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Section: Introductionmentioning

confidence: 99%

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

Wang¹,

Wang²,

Yang³

et al. 2020

Comptes Rendus. Chimie

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“…It is an exothermic reaction (Δ R H = −118 kJ mol −1 ) that proceeds at lower temperatures than the TDH and in the presence of oxygen. That prevents coking, whereas the selectivity is significantly lower due to unwanted side reactions like total and partial oxidations . Experimental work on this reaction with respect to selective , and non‐selective membranes has been conducted.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Membrane Reactors for Integrated Coupling of Oxidative and Thermal Dehydrogenation of Propane

Brune

Wolff

Seidel‐Morgenstern

et al. 2019

Chemie Ingenieur Technik

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This study presents strategies capable to intensify the thermal dehydrogenation of propane (TDH) using integrated reactor concepts. An inert packed bed membrane reactor for distributed dosing of oxygen to realize the oxidative dehydrogenation (ODH) was studied and compared to a reactor with catalytically active membrane. The latter concept allows to combine TDH and ODH in one apparatus to overcome the chemical equilibrium by in situ conversion of the by‐product H2 using O2 or in a reverse water‐gas shift reaction by CO2. If CO2 is used as active sweep gas the reactor offered better performance regarding yield and selectivity. Strategies for further thermal integration are discussed.

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“…1−5 The conventional olefin production processes such as steam cracking, fluid catalytic cracking (FCC), and dehydrogenation (DH) suffer from important drawbacks, namely, the high energy necessities, coke formation and thermodynamic limitations. 3,6,7 On the other hand, the oxidative dehydrogenation of light paraffins is an attractive route for olefin production. It is a low temperature process that limits coke formation and extends catalyst life.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, because of the limited number of ODH products, the separation cost is decreased considerably as well. 7,9 However, nowadays, ODH is still hindered by low alkane conversions and poor olefin selectivity. This prevents the ODH process from being applied in large scale processes.…”

Section: Introductionmentioning

confidence: 99%

“…Light olefins, such as ethylene and propylene, are important raw materials for a number of petrochemical products including polymers and synthetic rubbers. − The conventional olefin production processes such as steam cracking, fluid catalytic cracking (FCC), and dehydrogenation (DH) suffer from important drawbacks, namely, the high energy necessities, coke formation and thermodynamic limitations. ,, …”

Section: Introductionmentioning

confidence: 99%

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High Propylene Selectivity via Propane Oxidative Dehydrogenation Using a Novel Fluidizable Catalyst: Kinetic Modeling

Rostom

Lasa

2018

Ind. Eng. Chem. Res.

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This study reports propane oxidative dehydrogenation (PODH) kinetic modeling under oxygen-free conditions employing 7.5 wt % vanadium supported on a ZrO2–γAl2O3 (1:1 wt %) catalyst designated as 7.5 V/ZrO2–γAl2O3 (1:1). This fluidizable catalyst is prepared using a wet saturation impregnation technique to achieve high VO x dispersion. Its performance is analyzed in a mini-fluidizable CREC Riser Simulator using successive propane injections, 500–550 °C, close to atmospheric pressure, and 10–20 s reaction time. Propylene selectivities obtained are up to 94% at 25% propane conversion with the catalyst lattice oxygen contributing to the PODH reaction. Using this data, a “parallel-series” model is established based on a Langmuir–Hinshelwood rate equation. Adsorption constants are defined independently with this leading to a six-independent intrinsic kinetic parameters model. These six kinetic parameters are calculated via numerical regression with reduced spans for the 95% confidence interval and low cross-correlation coefficients. On this basis, the high propylene selectivity obtained can be explained given the much larger 2.82 × 10–5 mol.gcat–1s–1 frequency factor for propylene formation versus the 1.65 × 10–6 mol.gcat–1.s–1 frequency factor for propane combustion. Calculated energies of activation (55.7 kJ/mol for propylene formation and 33.3 kJ/mol for propane combustion) appear to moderate this effect, with the influence of frequency factors prevailing. Furthermore, propylene conversion into CO x oxidation appears as a nonfavored reaction step given the 98.5 kJ/mol activation energy and 4.80 × 10–6 mol.gcat–1.s–1 frequency factor. This kinetic model is considered of special value for the further development of a scaled-up twin fluidized bed reactor configuration for PODH.

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Performance evaluation of a novel reactor configuration for oxidative dehydrogenation of ethane to ethylene

Cited by 10 publications

References 28 publications

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

Selective catalytic and kinetic studies on oxydehydrogenation of ethane with CO2 over lanthanide metal catalysts

Analysis of Membrane Reactors for Integrated Coupling of Oxidative and Thermal Dehydrogenation of Propane

High Propylene Selectivity via Propane Oxidative Dehydrogenation Using a Novel Fluidizable Catalyst: Kinetic Modeling

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