Reaction Engineering Approaches to the Oxidative Coupling of Methane to C2+ Hydrocarbons

Mleczko, Lesław; Schweer, D.; Durjanova, Zuzana; Andorf, R.; Baerns, M.

doi:10.1016/s0167-2991(08)63859-8

Cited by 21 publications

(20 citation statements)

References 8 publications

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“…Lanthanum catalysts can have different phases such as La 2 (CO 3 ) 3 , La 2 O 2 CO 3 , La(OH) 3 or La 2 O 3 [12]. These different phases present different catalytic activities but at 850 8C in air, they all change to La 2 O 3 [13].…”

Section: Methodsmentioning

confidence: 99%

“…Ethane is formed by coupling reaction between methyl radicals CH 3 in the gas phase (step 4). The important formation of methyl radicals by the catalyst makes the gas phase coupling of these radicals a major pathway for the formation of C 2 products [37].…”

Section: Pyrolysis Pathwaymentioning

confidence: 99%

“…The choice of catalyst, temperature, pressure and space velocity should be made in agreement with mechanistic information. Mechanistic studies have been extensively performed over the last decades [1][2][3] but few works have taken into account both homogeneous reactions and heterogeneous reactions [4][5][6]. It is believed that these two types of reaction should be considered in order to get a more exhaustive and reasonable mechanistic scheme.…”

Section: Introductionmentioning

confidence: 99%

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Discussion on the oxidative and the pyrolysis routes of the CH3 radicals in the partial oxidation of methane over La2O3

Fleys

Simon

Marquaire

2007

Journal of Analytical and Applied Pyrolysis

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Section: Methodsmentioning

confidence: 99%

Section: Pyrolysis Pathwaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Discussion on the oxidative and the pyrolysis routes of the CH3 radicals in the partial oxidation of methane over La2O3

Fleys

Simon

Marquaire

2007

Journal of Analytical and Applied Pyrolysis

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“…A three-stage reactor packed with Li/MgO catalyst was used by Matsura and Yoshida [80] to improve yield and 49% methane conversion and 60% C,z " hydrocarbon selectivity were obtained. Mleczko et al [81] studied both tied and fluiduedbed reactors operated in two dflerent modes: co-feed of CH1 and Oz and distributed feed of Oz with three catalysts: PbO/y-AlzO~, NaOH/CaO, and LazO~CaO. The distributed feed resulted in a marked increase of selectivityand yield.…”

Section: Introductionmentioning

confidence: 99%

“…The methane flow rate was 30rnl/rnin and 8:1 mixtures of He and 02 at 70, 56, and 45 mlhnin were introduced to the fust, second, and third stage, respectively. Mleczko et al [76,81] ) studied both freed and fluidized-bed reactors operated in two different modes: co-feed of CH4 and 02 and distributed feed of 02 with three catalysts: PbO/cx -A1203, NaOH/CaO, and La203/CaO. The distributed feed resulted in a marked increase of selectivity and yield.…”

mentioning

confidence: 99%

Oxidative Coupling of Methane Using Inorganic Membrane Reactors

Ma¹,

Moser²,

Dixon³

et al. 1998

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Fluidized‐Bed Membrane Reactors

Tóta

Heinrich

et al. 2010

Membrane Reactors

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168 Fluidized-Bed Membrane Reactorsin the fl uidized bed. The product selectivity and yield were increased in part of the operation range. A signifi cant infl uence of the secondary gas injections was approved.A concept for separate reactant dosing was proven by Soler et al. ( 1999 ) for the oxidative dehydrogenation of n -butane to butadiene by separation of the oxidation and the reduction zones in the same catalytic fl uidized bed. The butadiene yield was about 200% higher than in the conventional reactor.Al -Sherehy, Grace, and Adris ( 2005 ) investigated the effect of the discrete distributing gaseous feed along a bubbling fl uidized bed on the ethane partial oxidation to ethylene and acetic acid. An improvement of the product selectivity and the reactor performance was achieved by using multiple nozzles for the secondary gas injection.Recent developments in the material sciences, and especially the development of suitable inorganic membranes which are chemically resistant and stable at high temperatures, offer the integration of membranes into catalytic reactors and a new reactor design. Only a limited number of applications of the membrane -assisted FLBR for the distributive feeding of one of the reactants have been investigated and most of these applications involve the controlled dosing of reactant via porous membranes. Alonso et al. ( 2001 ) studied the butane partial oxidation in an externally FLBMR. Air from a pre -heated fl uidized bed (catalytic inert) fl ows across a catalyst -fi lled membrane tube. A detailed reactor model demonstrated a minimized hot spot effect and maleic anhydride yields were predicted to be 50% higher compared to a conventional fi xed -bed reactor. However, later experimental data (Alonso et al. , 2005 ) show that, on average, the overall performance in the conventional fi xed bed is superior to the membrane confi guration because selectivity is higher and the reactor may be operated at higher temperatures resulting in superior MA yields. Ramos et al. (2001) proposed a similar concept for the partial oxidation of propane to propene. Air fl uidized the shell side where catalyst -fi lled membrane tubes and cooling coils were immersed. Oxygen transport through the membrane was controlled by the pressure drop. The controlled oxygen addition along the axis improved the propene selectivity and broadened the operating range with respect to the hydrocarbon and oxygen feed rates. Recently, Deshmukh et al. ( 2005a, 2005b ) constructed a small laboratory -scale FLBMR for the partial oxidation of methanol to formaldehyde. High methanol conversion and high selectivity to formaldehyde were achieved with safe reactor operation (isothermal reactor conditions) at higher methanol inlet concentrations than that currently employed in industrial processes.An area of much current interest is the production of hydrogen via methane steam reforming or autothermal reforming. Fluidized -bed concepts were proposed to solve the problems of thermal control encountered in fi xed -bed reactors. These studies...

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Reaction Engineering Approaches to the Oxidative Coupling of Methane to C2+ Hydrocarbons

Cited by 21 publications

References 8 publications

Discussion on the oxidative and the pyrolysis routes of the CH3 radicals in the partial oxidation of methane over La2O3

Discussion on the oxidative and the pyrolysis routes of the CH3 radicals in the partial oxidation of methane over La2O3

Oxidative Coupling of Methane Using Inorganic Membrane Reactors

Fluidized‐Bed Membrane Reactors

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