Oxidative coupling of methane over LnLiO2 compounds (Ln = Sm,Nd,La)

Kaddouri, A.; Kieffer, R.; Kiennemann, A.; Poix, P.; Rehspringer, Jean‐Luc

doi:10.1016/s0166-9834(00)80216-x

Cited by 14 publications

(8 citation statements)

References 7 publications

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“…19 Characterization of (Ln \ La, Nd LiLnO 2 and Sm) after use in the oxidative coupling of methane (OCM) at 750 ¡C, revealed that the structure of these catalysts was retained. 18 The yttrium analogue appeared to undergo LiYO 2 partial transformation into an amorphous phase at the reported reaction conditions. ).…”

mentioning

confidence: 88%

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Binary caesium–lanthanum oxide supported on MCM-41: A new stable heterogeneous basic catalyst

Kloetstra¹,

Laren²,

Bekkum³

1997

Faraday Trans.

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confidence: 88%

“…Other binary alkali metalÈlanthanide oxides can be prepared via thermal decomposition of the corresponding metal salts and resulted in the same binary oxide product as via the normal route 18,19,21,22. …”

mentioning

confidence: 99%

Binary caesium–lanthanum oxide supported on MCM-41: A new stable heterogeneous basic catalyst

Kloetstra¹,

Laren²,

Bekkum³

1997

Faraday Trans.

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“…Figure 1 shows a summary of catalytic results from available (best of our knowledge) publications describing the use of neodymium‐based catalysts for OCM. The data are plotted and indexed in Table S1 with corresponding references used to plot 17,21,26,27,31–41 …”

Section: Introductionmentioning

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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“…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%

“…12 As this reaction requires basic sites, others tried combining Li + with an alkali earth metal such as Mg, Ca, or Sr. 13,14 Other examples exist where Li + is combined with lanthanides. 11, 15,16 Another type of catalytic system that shows a promising performance is a trimetallic system based on Mn−Na−W/SiO 2 . 6,7,17 However, this system shows high ignition temperature.…”

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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Oxidative coupling of methane over LnLiO2 compounds (Ln = Sm,Nd,La)

Cited by 14 publications

References 7 publications

Binary caesium–lanthanum oxide supported on MCM-41: A new stable heterogeneous basic catalyst

Binary caesium–lanthanum oxide supported on MCM-41: A new stable heterogeneous basic catalyst

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

Oxidative Coupling of Methane over MOF-Mediated La₂O₃

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Oxidative coupling of methane over LnLiO2 compounds (Ln = Sm,Nd,La)

Cited by 14 publications

References 7 publications

Binary caesium–lanthanum oxide supported on MCM-41: A new stable heterogeneous basic catalyst

Binary caesium–lanthanum oxide supported on MCM-41: A new stable heterogeneous basic catalyst

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

Oxidative Coupling of Methane over MOF-Mediated La2O3

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Oxidative Coupling of Methane over MOF-Mediated La₂O₃