SrO·Al2O3 mixed oxides: A promising class of catalysts for oxidative coupling of methane

Baidya, Tinku; Vegten, Niels van; Verel, René; Jiang, Yijiao; Yulikov, Maxim; Kohn, Thomas D.; Jeschke, Gunnar; Baiker, Alfons

doi:10.1016/j.jcat.2011.05.005

Cited by 33 publications

(22 citation statements)

References 70 publications

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“…that rare earth oxides, mainly M/La 2 O 3 or Sm 2 O 3 (M=Ca, Sr, Ba etc. ), appear to belong to the most active materials in this group of catalysts 35. This was exemplified in a pioneering study by Deboy and Hicks using Sr‐doped La 2 O 3 , which resulted in a C 2 yield of almost 20 % at a C 2 selectivity of 69 % 36.…”

Section: Oxidation Of Methane To Olefinsmentioning

confidence: 98%

“…Further advances in the utilisation of Al 2 O 3 ‐containing catalytic materials were recently demonstrated by Baiker et al. In a comprehensive study, they compared the catalytic performance of different Sr–Al mixed oxide composites, and revealed that the ratio of tetrahedrally to octahedrally coordinated alumina increases with a higher content of Sr and that this correlates favourable with increased activity and C 2 selectivity 35. They found that a Sr/Al ratio of 1.25 leads to the most promising C 2 yields (18 %) and C 2 selectivities (63 %) at a methane conversion of 28 %.…”

Section: Oxidation Of Methane To Olefinsmentioning

confidence: 98%

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A Mechanistic Study on the Nucleation and Growth of Au on Pd Seeds with a Cubic or Octahedral Shape

Zeng

Jin

et al. 2012

ChemCatChem

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This article reports a systematic study on the seed‐mediated growth of Pd–Au bimetallic nanocrystals with a variety of controlled morphologies. The key to the success of this synthesis is to manipulate the reaction kinetics by controlling a set of experimental parameters, which include the amount of ascorbic acid used as a reductant, the amount of HAuCl4 as a precursor to elemental Au, the reaction temperature, and the type of seeds employed. Starting from Pd nanocubes of 18 nm in edge length, Pd–Au bimetallic nanocrystals with a number of morphologies, which includes hybrid dimers, core–shell nanocubes with flat faces, and core–shell nanocubes with concave faces could all be obtained by simply speeding up the reduction of HAuCl4. The same synthesis and control could also be extended to seeds based on Pd octahedrons. For the first time, it was possible to generate Pd@Au core–shell nanocubes and octahedrons with concave faces. The Pd@Au core–shell nanocubes with concave faces exhibited enhanced activity in catalyzing the oxidization of ascorbic acid relative to their counterparts with flat faces or the cubic Pd seeds.

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Section: Oxidation Of Methane To Olefinsmentioning

confidence: 98%

Section: Oxidation Of Methane To Olefinsmentioning

confidence: 98%

A Mechanistic Study on the Nucleation and Growth of Au on Pd Seeds with a Cubic or Octahedral Shape

Zeng

Jin

et al. 2012

ChemCatChem

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“…to the pure samaria reference catalyst, additional experiments were performed to probe the effects of O 2 conversion on these reactions. A significant portion of studies in the literature either report 100 % O 2 conversion or do not comment on the oxygen utilization [31][32][33]. The reason for this is that the methane conversion and C 2?…”

Section: Catalysismentioning

confidence: 99%

Sol–Gel Preparation of Samaria Catalysts for the Oxidative Coupling of Methane

et al. 2015

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A new sol-gel synthesis route for aluminasamaria mixed aero-and xerogel catalysts based on the socalled epoxide addition method and the use of these systems as catalysts for the oxidative coupling of methane (OCM) is reported. As precursors simple chloride or nitrate salts can be used. The mesoporous materials are X-ray amorphous even after calcination to 800°C and show an intimate mixing of Al and Sm on the nanoscale. In the case of the xerogels derived from chlorides, C 2 yields comparable to pure samaria can be achieved under OCM reaction conditions with 100 % O 2 conversion. Even at lower O 2 conversions the activity of the xerogel is competitive with a pure samaria reference catalyst taking the lower samaria content of 20 % into account. Accordingly, the approach is suitable to reduce the costs associated with the rare earth oxide. In addition to the preparation of aerogel and xerogel particles, the presented synthesis also allows the fabrication of xerogel films which can be coated on a suitable (monolithic) support. First results of such films are presented. Graphical AbstractKeywords Oxidative methane coupling Á Sol-gel chemistry Á Rare earth oxide catalyst Electronic supplementary material The online version of this article (

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“…The presence of BaCl 2 in TiO 2 and SnO 2 650 enhances the formation of activated oxygen species that can 651 interact with methane to produce methyl radicals as also observed 652 previously [111,112]. 653 Baidya et al [113] conducted the reaction with mixed oxides 654 based on SrO and Al 2 O 3 synthesized from co-precipitation of the 655 corresponding metal hydroxides. The Sr/Al in the catalysts was 656 varied from 0 to 1.5.…”

mentioning

confidence: 83%

Revisiting the oxidative coupling of methane to ethylene in the golden period of shale gas: A review

Galadima

Muraza

2016

Journal of Industrial and Engineering Chemistry

184

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SrO·Al2O3 mixed oxides: A promising class of catalysts for oxidative coupling of methane

Cited by 33 publications

References 70 publications

A Mechanistic Study on the Nucleation and Growth of Au on Pd Seeds with a Cubic or Octahedral Shape

A Mechanistic Study on the Nucleation and Growth of Au on Pd Seeds with a Cubic or Octahedral Shape

Sol–Gel Preparation of Samaria Catalysts for the Oxidative Coupling of Methane

Revisiting the oxidative coupling of methane to ethylene in the golden period of shale gas: A review

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