Oxidative Coupling of Methane in a Fluidized-Bed Reactor over a Highly Active and Selective Catalyst

Mleczko, Lesław; Pannek, U.; Niemi, V.; Hiltunen, J.

doi:10.1021/ie950145s

Cited by 25 publications

(14 citation statements)

References 13 publications

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“…Light-off temperatures of 815, 843, and 865 K were observed for CH4:O2 ratios of 1.94, 0.98, and 0.47, respectively. The increase in light-off temperature with decreasing CH4:O2 is consistent with the reported behavior of CH4 oxidation rate, namely, first and negative order dependencies on the partial pressures of CH4 and 02 respectively [3][4][5][6]. Table 1 shows the steady state composition of the product during methane oxidation over Pt-NiO/AlzO3.…”

Section: Effect Of Feed Compositionsupporting

confidence: 84%

Activities of δ-Al2O3-supported bimetallic Pt−NiO and Co−NiO catalysts for methane autoreforming: Oxidation studies

Opoku-Gyamfi

Tafreshi

Adesina

1998

React Kinet Catal Lett

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The methane oxidation activities of Pt-NiO and Co-NiO bimetallic catalysts have been investigated as part of a larger research program on the autothermal reforming of methane (combined methane oxidation and steam reforming) in a fluidized bed reactor. Experiments at atmospheric pressure and 783-1023 K for both catalysts showed that the reaction was more selective towards 1-12 production at CH4:O2 ratios greater than unity. Light-off temperature increased with decreasing CI-I4:O2 ratios, but increase in gas velocity (beyond minimum fluidization) increased the light-off temperature. Co-NiO was as promising as the more expensive Pt-NiO catalyst for the oxidation.

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Section: Effect Of Feed Compositionsupporting

confidence: 84%

Activities of δ-Al2O3-supported bimetallic Pt−NiO and Co−NiO catalysts for methane autoreforming: Oxidation studies

Opoku-Gyamfi

Tafreshi

Adesina

1998

React Kinet Catal Lett

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“…In order to increase the efficiency of spacetime, industrial fluidized bed reactors should work at gas velocities higher than experimental reactors. In addition, for the catalysts La 2 O 3 / CaO [35] and PbO/γ-Al 2 O 3 [ 33], increasing gas velocity results in improved selectivity of C 2+ The effect is not repeatable when Zr / La / Sr catalysts are used and increasing gas velocity reduces C2+ selectivity (Figures 3-3 and 3-4) [33]. However, due to increasing methane conversion, higher yields can be obtained.…”

Section: The Effect Of Gas Velocitymentioning

confidence: 97%

“…Since in bubble bed, reverse gas blend is more concentrated, ethylene and ethane can move from the upper part of the bed into the distribution oxygen-rich zone (where they burn) [33].…”

Section: The Effect Of Bed Heightmentioning

confidence: 99%

Investigation of activity and selectivity of redox catalysts in oxidative coupling of methane in fluidized bed reactor

Bayanak¹,

Azimi²

2016

J. Fundam and Appl Sci.

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In this study, oxidative coupling of methane on Redox catalysts in fluidized bed reactor was investigated. For this purpose, the catalyst Mn-Na 2 WO 4 /SiO 2 was selected as a Redox catalyst. In order to investigate this catalyst, transient state experiments were designed and performed. Then, the different reaction conditions on this catalyst in a fluidized bed reactor were investigated. In transient state experiments, methane feed without the presence of oxygen in the gas phase was sent incrementally on the catalyst and oxidative coupling of methane was examined. Reactor output was analyzed by two systems of GC and GC-MS. The effect of different operational temperatures on the amount of production of coupling products showed that the catalyst has Redox features. With increasing catalyst bed temperature, mobility of oxygen in network increases, which leads to an increase in production. Reoxidation of catalyst bed with oxygen and repeating the experiment and the results confirmed the property of redox catalyst. Then, transient state experiments at temperatures of 800 and 850 o C were repeated with the same conditions and the percentage of methane conversion, selectivity, and mole percent of components were investigated. It was observed that at first, methane conversion is high and then as the oxygen of the catalyst and the speed decrease, methane conversion decreases dramatically. According to the chart of mole composition, when the conversion rate is high, the main products of coupling reaction are C 2 H 6 , C 2 H 4 is.

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“…Therefore, by considering these available feedstocks, several routes are being studied and developed for the production of ethylene from ethane such as the oxidative de-hydrogenation of ethane (ODHE) (Bhasin et al, 2001;Grubert et al, 2003), and from methane such as methanol-to-olefins reaction (Keil, 1999;Chen et al, 2005), Fischer-Tropsch synthesis (Lunsford, 2000), and the Oxidative Coupling of Methane (OCM) (Keller and Bhasin, 1982;Ito and Lunsford, 1985;Amenomiya et al, 1990;Lunsford, 1995). Amongst these, the use of CH 4 for the production of valuable chemicals is preferred due to economic reasons (Mleczko and Baerns, 1995;Mleczko et al, 1996), and in particular OCM is considered one of the most attractive options as a direct route for the direct conversion of CH 4 into C 2 H 4 .…”

Section: Introductionmentioning

confidence: 99%

Catalyst Screening for Oxidative Coupling of Methane Integrated in Membrane Reactors

et al. 2018

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Increased availability of methane from shale gas and stranded gas deposits in the recent years may facilitate the production of ethylene by means of potentially more competitive routes than the state-of-the-art steam cracking processes. One appealing route is the oxidative coupling of methane (OCM), which is considered in this work for the production of ethylene by means of the use of catalytic membrane reactors (CMR) based on Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCF) ceramic material. In a first approach, a screening of 15 formulations as catalysts for the ethylene-ethane production was conducted on CMR consisting of disk-shaped planar BSCF membranes. At 900 • C, the maximum C 2 selectivity was 70%, reached with Ba 0.5 Sr 0.5 FeO 3−δ and La 0.5 Ce 0.1 Sr 0.4 Co 0.8 Fe 0.2 O 3−δ catalysts. On the other hand, low CH 4 conversions (X CH4) resulted in C 2 yields below 3%. Operation at 1,000 • C significantly shifted X CH4 for all the activated membranes due to the decrease in CH 4 /O 2 ratios, thus obtaining C 2 yields close to 9% and productivities of ca. 1.2 ml•min −1 •cm −2 with Ce 0.9 Gd 0.1 O 2−δ and Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ impregnated with Mn-Na 2 WO 4 catalysts. The performance of OCM reaction was also studied in a tubular catalytic membrane reactor. Tubular configuration improved C 2 yield by minimizing CH 4 /O 2 ratios up to 1.7, obtaining a maximum of 15.6% at 900 • C with a BSCF capillary membrane activated with a packed bed of 2 wt% Mn/5 wt% Na 2 WO 4 on SiO 2 catalyst.

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Oxidative Coupling of Methane in a Fluidized-Bed Reactor over a Highly Active and Selective Catalyst

Cited by 25 publications

References 13 publications

Activities of δ-Al2O3-supported bimetallic Pt−NiO and Co−NiO catalysts for methane autoreforming: Oxidation studies

Activities of δ-Al2O3-supported bimetallic Pt−NiO and Co−NiO catalysts for methane autoreforming: Oxidation studies

Investigation of activity and selectivity of redox catalysts in oxidative coupling of methane in fluidized bed reactor

Catalyst Screening for Oxidative Coupling of Methane Integrated in Membrane Reactors

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