Catalytic Oxidative Coupling of Methane Over Alkaline Earth Metal Substituted Perovskite Oxides

Kaiji, Zhen; Liu, Yu; Yingli, Bi; Quan, Wei

doi:10.1016/s0167-2991(08)60071-3

Cited by 3 publications

(4 citation statements)

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“…Another approach is to combine Li + with alkali earth metals such as Mg, Ca, and Sr, , as the presence of basic sites benefits the reaction. Other examples include combining Li + with lanthanides. ,, Another type of catalytic system that shows a promising performance is a trimetallic system based on Mn–Na–W/SiO 2 . ,, However, this catalyst system shows a high ignition temperature as will be highlighted in the following paragraphs. , Perovskite-type and fluorite-type catalysts have also been shown to be active for OCM. , Catalysts based on lanthanides, such as La 2 O 3 , Nd 2 O 3 , Gd 2 O 3 , and Sm 2 O 3 , generally show satisfactory performance with excellent thermal stability and appropriate ignition-extinction properties. − …”

Section: Technology Status and Challengesmentioning

confidence: 99%

“…35,53 Perovskitetype and fluorite-type catalysts have also been shown to be active for OCM. 54,55 Catalysts based on lanthanides, such as La 2 O 3 , Nd 2 O 3 , Gd 2 O 3 , and Sm 2 O 3 , generally show satisfactory performance with excellent thermal stability and appropriate ignition-extinction properties. 56−63 The challenges that fall into the domain of engineering and reactor design are summarized in the following three points:…”

Section: ■ Introductionmentioning

confidence: 99%

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Divide to Conquer: On the Use of Distributed Feed Strategies in Oxidative Coupling of Methane

Alahmadi,

Bavykina,

Morlanes

et al. 2023

Ind. Eng. Chem. Res.

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The oxidative coupling of methane (OCM) represents a promising method for the direct conversion of methane into ethylene, the most highly sought-after olefin in the petrochemical market. Nevertheless, the adoption of the OCM in industrial applications has been hampered by inherent chemical and engineering challenges. As a result, research endeavors have been directed toward developing innovative strategies to enhance the performance of the OCM process. This review offers a comprehensive overview of the challenges faced by the OCM, which has led to research exploring the use of a distributed feed policy. In this approach, methane and oxygen (the reactants for the OCM) are introduced separately, either through multiple oxygen injection points in the case of packed-bed reactors or into two distinct compartments in the case of membrane reactors. Additionally, we present an overview of the various types of membranes utilized in this context. More particularly, we focus on the use of mixed-ionic-electronic-conducting (MIEC) membranes to address the challenges of OCM. Due to their unique ionic conductive properties, MIEC membranes help to increase the overall efficiency of the OCM process. For example, an MIEC membrane intensifies the process for both air separation and the OCM reaction being conducted in a single unit, consequently simplifying upstream processing. It also aids in conducting the OCM reaction in a much safer environment, where gas-phase reactions of methane and oxygen are eliminated. With oxygen being a limited reactant in the OCM, this configuration also helps achieve higher methane conversion by allowing the safe feeding of more oxygen. Additionally, higher selectivity can be achieved by suppressing gas-phase reactions. In this case, oxygen is directly available in the catalyst zone. Finally, this review investigates the chemical and mechanical stability of MIEC membranes for OCM applications, and we conclude with important remarks and outlooks.

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Section: Technology Status and Challengesmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Divide to Conquer: On the Use of Distributed Feed Strategies in Oxidative Coupling of Methane

Alahmadi,

Bavykina,

Morlanes

et al. 2023

Ind. Eng. Chem. Res.

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“…A good example is using Li + over supports such as alumina . As this reaction requires basic sites, others tried combining Li + with an alkali earth metal such as Mg, Ca, or Sr. , Other examples exist where Li + is combined with lanthanides. ,, Another type of catalytic system that shows a promising performance is a trimetallic system based on Mn–Na–W/SiO 2 . ,, However, this system shows high ignition temperature. , Moreover, perovskite-type and fluorite-type catalysts have also shown to be active for OCM. , Among the hundreds of tested catalysts, rare earth lanthanides seem to be the most promising due to their excellent performance and their appropriate ignition-extinction properties, which make them suitable for commercial processes that operate in an adiabatic autothermal mode. , Specifically, one of the most studied catalysts is lanthanum oxide (La 2 O 3 ). − …”

Section: Introductionmentioning

confidence: 99%

“…18,19 Moreover, perovskite-type and fluorite-type catalysts have also shown to be active for OCM. 20,21 Among the hundreds of tested catalysts, 9 rare earth lanthanides 18 seem to be the most promising due to their excellent performance and their appropriate ignition-extinction properties, which make them suitable for commercial processes that operate in an adiabatic autothermal mode. 19,22 Specifically, one of the most studied catalysts is lanthanum oxide (La 2 O 3 ).…”

Section: ■ Introductionmentioning

confidence: 99%

Oxidative Coupling of Methane over MOF-Mediated La₂O₃

Alahmadi

Khan

Poloneeva

et al. 2022

Ind. Eng. Chem. Res.

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Due to the recent increase in natural gas reservoir discoveries, where methane is the main constituent, research into the upgrading of methane is gaining more attention. Among the techniques being explored, Oxidative Coupling of Methane (OCM) is one of the most promising routes for on-purpose ethylene production. OCM requires an efficient catalyst to achieve high C2+ selectivity, and lanthanum oxide has long been known to be a promising catalyst for this reaction. However, it is well-known that the synthesis method for OCM catalysts plays an important role in the performance of materials like La2O3 for this reaction. Herein, we report the catalytic performance of La2O3 prepared through the use of an inexpensive La-based-Metal Organic Framework (La-MOF) and compare its activity to a conventionally prepared La2O3 via sol–gel (La-SG) and an off-the-shelf commercial La2O3 (La-C). All three catalysts exhibit the hexagonal crystal structure of La2O3. The catalytic tests were carried out between 600 and 800 °C using different feed ratios (methane to oxygen) ranging between 3.5 and 13. Among these three catalysts, La-MOF exhibits the smallest particle size of 220 nm versus 350 and 1140 nm for La-SG and La-C, respectively. XPS results suggest the formation of different surface species on the catalyst’s surface which can influence the selectivity and catalytic results at 800 °C for a methane to oxygen ratio of 3.5 showing that the C2+ yield for La-MOF was approximately 15.8%–higher than 11.75% and 9.5% for La-SG and La-C, respectively.

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Reactivity of perovskites on oxidative coupling of methane

Teymouri

Bagherzadeh

Petit

et al. 1995

JOURNAL OF MATERIALS SCIENCE

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Catalytic Oxidative Coupling of Methane Over Alkaline Earth Metal Substituted Perovskite Oxides

Cited by 3 publications

References 1 publication

Divide to Conquer: On the Use of Distributed Feed Strategies in Oxidative Coupling of Methane

Divide to Conquer: On the Use of Distributed Feed Strategies in Oxidative Coupling of Methane

Oxidative Coupling of Methane over MOF-Mediated La₂O₃

Reactivity of perovskites on oxidative coupling of methane

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Catalytic Oxidative Coupling of Methane Over Alkaline Earth Metal Substituted Perovskite Oxides

Cited by 3 publications

References 1 publication

Divide to Conquer: On the Use of Distributed Feed Strategies in Oxidative Coupling of Methane

Divide to Conquer: On the Use of Distributed Feed Strategies in Oxidative Coupling of Methane

Oxidative Coupling of Methane over MOF-Mediated La2O3

Reactivity of perovskites on oxidative coupling of methane

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Oxidative Coupling of Methane over MOF-Mediated La₂O₃