Partial oxidation of methane to produce syngas over a neodymium–calcium cobaltate-based catalyst

Дедов, А. Г.; Локтев, А. С.; Komissarenko, Dmitrii A.; Мазо, Г. Н.; Shlyakhtin, O.A.; Parkhomenko, Ksenia; Kiennemann, A.; Roger, Anne‐Cécile; Ishmurzin, A. V.; Моисеев, И. И.

doi:10.1016/j.apcata.2014.10.027

Cited by 55 publications

(22 citation statements)

References 43 publications

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“…This high temperature exceeds the range in which common industrial stainless steel reactors can be used, specifically 650°C or lower. Moreover, base metal catalysts are often deactivated by severe coking and re-oxidation during the reaction [13][14][15] . Thus, these issues with base metals often result in a high long-term cost.…”

mentioning

confidence: 99%

Trace mono-atomically dispersed rhodium on zeolite-supported cobalt catalyst for the efficient methane oxidation

et al. 2018

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The partial oxidation of methane is a promising method for the efficient production of syngas. To implement this process using common stainless steel reactors, an inexpensive catalyst that functions at 650°C or below is necessary. However, base metal catalysts typically require much higher temperatures, and they are deactivated by re-oxidation and coke formation. Here we report that modification of a zeolite-supported 3 wt% cobalt catalyst with a trace amount of mono-atomically dispersed rhodium (0.005 wt%) dramatically improves catalytic performance and durability. Cobalt/mordenite is nearly inactive due to the oxidation of cobalt, but the catalyst modified with rhodium continuously gives 85-86% methane conversion and 90-91% CO selectivity with an H 2 /CO ratio of 2.0 without serious coking at 650°C. During the reaction, mono-atomically dispersed rhodium converts cobalt oxide to Co 0 active species via hydrogen spillover. Use of the zeolite support is key to the high catalytic performance.

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confidence: 99%

Trace mono-atomically dispersed rhodium on zeolite-supported cobalt catalyst for the efficient methane oxidation

et al. 2018

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“…Obviously, Pt/S-1 catalyst exhibited visible induction period, which is, the values of CH 4 conversion and H 2 selectivity reached a maximum after 7 h of reaction. This may be characteristic of solid-state reactions [41]. It was worth noting that the value of the H 2 selectivity on Pt@S-1 sample exceeded 1, and the H 2 /CO ratio was significantly greater than the stoichiometric ratio of POM, indicating that other reactions occurred under the experimental conditions studied.…”

Section: Tgamentioning

confidence: 78%

In Situ Encapsulated Pt Nanoparticles Dispersed in Low Temperature Oxygen for Partial Oxidation of Methane to Syngas

Wang

Ding

et al. 2019

Catalysts

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Highly dispersed ultra-small Pt nanoparticles limited in nanosized silicalite-1 zeolite were prepared by in situ encapsulation strategy using H2PtCl6·6H2O as a precursor and tetrapropylammonium hydroxide as a template. The prepared Pt@S-1 catalyst was characterized by X-ray diffraction (XRD), inductively coupled plasma (ICP), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), N2 adsorption-desorption, CO adsorption, and TGA techniques and exhibited unmatched catalytic activity and sintering resistance in the partial oxidation of methane to syngas. Strikingly, Pt@S-1 catalyst with further reduced size and increased dispersibility of Pt nanoparticles showed enhanced catalytic activity after low-temperature oxygen calcination. However, for Pt/S-1 catalyst, low-temperature oxygen calcination did not improve its catalytic activity.

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“…Равномерного распределения частиц компонентов катализатора можно добиться разложением предварительно синтезированных фаз -прекурсоров, содержащих необходимые катионы в заданном соотношении. В [9,10] Низкую каталитическую активность композитов 1-й группы на основе кобальта можно объяснить высокой реакционной способностью ультрадисперсных каталитически активных компонентов (металлического кобальта и его оксидов) в образовании сложных оксидов, устойчивых к восстановлению метаном и продуктами ККМ. Возросший выход СГ при использовании в ККМ композитов 2-й и 3-й групп, вероятно, обусловлен наличием в их составе несвязанных оксидов Ni и Co, каталитическая активность которых объясняется авторами [5,7] присутствием следовых количеств металла на их поверхности.…”

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New metal-oxide composite materials as efficient catalysts of the partial oxidation of methane

Dedov¹,

Slyakhtin²,

Loktev³

et al. 2019

Доклады Академии наук

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Single-phase complex oxides Nd2-yCayCoxNi1-xO4 have been synthesized for the first time. Composites prepared by the reduction of these compounds with hydrogen and containing Nd2O3, CaO, and cobalt and nickels metals have been used for the first time as catalysts of the partial oxidation of methane. The maximal methane conversions (97%) and syngas yields (96%) at 900 °С have been detected in the presence of the composite obtained from Nd1,5Ca0,5NiO4. At T < 850 °C, the nickel–cobalt composite synthesized from Nd1,3Ca0,7Co0,4Ni0,6O4 turned out to be more selective in the formation of syngas. Decreasing the partial oxidation temperature from 900 °С to 750 °С leads to the oxidation of metallic nickel and cobalt to oxides and to partial resynthesis of complex oxides with perovskite and K2NiF4 structures. The observed differences in temperature dependence of the catalytic properties of composites with various Ni/Co ratios can be associated with the participation of complex oxides in catalysis of the partial oxidation of methane at low temperatures.

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Partial oxidation of methane to produce syngas over a neodymium–calcium cobaltate-based catalyst

Cited by 55 publications

References 43 publications

Trace mono-atomically dispersed rhodium on zeolite-supported cobalt catalyst for the efficient methane oxidation

Trace mono-atomically dispersed rhodium on zeolite-supported cobalt catalyst for the efficient methane oxidation

In Situ Encapsulated Pt Nanoparticles Dispersed in Low Temperature Oxygen for Partial Oxidation of Methane to Syngas

New metal-oxide composite materials as efficient catalysts of the partial oxidation of methane

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