Autothermal Oxidative Coupling of Methane: Steady‐State Multiplicity over Mn‐Na2WO4/SiO2 at Mini‐Plant Scale

Ortiz, A. Perez; Penteado, Alberto; Karsten, Tim; Esche, Erik; Grigull, Vitor; Schomäcker, Reinhard; Repke, Jens‐Uwe

doi:10.1002/cite.202100195

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…The ignition-extinction behavior is an important property for oxidation reactions 52 and has been analyzed particularly for OCM reaction by many authors for different catalytic systems such as La 2 O 3 / CaO, 53 La 2 O 3 /CeO 2 , 18,54,55 Mn-Na 2 WO 4 /SiO 2 , 18,56,57 Fe-P-O, 58 Cs-Sr-La 2 O 3 , 59 Sr-Sm 2 O 3 , 60 BaCO 3 -La 2 O 3 61 along with other modeling activities. 49,62 The thermal effect and ignition-extinction behavior to enable steady-state operation of OCM reactor in autothermal mode was shown to be greatly influenced by the residence time (flow rates, bed height and tube diameter) and nature of the catalyst.…”

Section: Information File Contains Tabulated Results Of All Catalytic...mentioning

confidence: 99%

Oxidative coupling of methane over strontium‐doped neodymium oxide: Parametric evaluations

et al. 2022

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Since its discovery in 1982, oxidative coupling of methane (OCM) has been considered one of the most promising approaches for the on-purpose synthesis of ethylene.The development of more selective catalysts is essential to improve process economics. In this work, undoped neodymium oxide as well as neodymium oxide doped with high (20%) and low (2.5%) levels of strontium were tested in a high-throughput fashion covering a wide range of operating conditions. The catalysts were shown to be able to achieve greater than 18% C 2 + yield. Space velocity was shown to play a significant role in C 2 + selectivity. For a methane to oxygen feed ratio of 3.5, selectivity increased with increasing space velocity, reaching a maximum of 62% at a methane conversion of 30% at an optimal space velocity of $250,000 ml/h/g. The difference in activity between the three samples was linked to the contribution of different oxygen centers.

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Section: Information File Contains Tabulated Results Of All Catalytic...mentioning

confidence: 99%

Oxidative coupling of methane over strontium‐doped neodymium oxide: Parametric evaluations

et al. 2022

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“…However, Mn–Na 2 WO 4 /SiO 2 was not active enough. Furthermore, the ignition-extinction behavior is important for oxidation reactions and has been studied for the OCM reaction by many authors , and for different catalytic systems, such as La 2 O 3 /CaO, La 2 O 3 /CeO 2 , ,, Mn–Na 2 WO 4 /SiO 2 , ,, Fe–P–O, Cs–Sr–La 2 O 3 , Sr–Sm 2 O 3 , and BaCO 3 –La 2 O 3 . The residence time (flow rates, bed height, and tube diameter) and nature of the catalyst were shown to have a large thermal effect and influence the ignition-extinction behavior, which is required to enable steady-state operation of the OCM reactor in auto thermal mode.…”

Section: Technology Status and Challengesmentioning

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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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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Autothermal Oxidative Coupling of Methane: Steady‐State Multiplicity over Mn‐Na₂WO₄/SiO₂ at Mini‐Plant Scale

Cited by 2 publications

References 16 publications

Oxidative coupling of methane over strontium‐doped neodymium oxide: Parametric evaluations

Oxidative coupling of methane over strontium‐doped neodymium oxide: Parametric evaluations

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

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