Perovskite as catalyst precursors in the partial oxidation of methane: The effect of cobalt, nickel and pretreatment

Santos, Milena de Santana; Neto, Raimundo Crisostomo Rabelo; Noronha, Fábio B.; Bargiela, Pascal; Rocha, Maria da Graça Carneiro da; Resini, Carlo; Carbó‐Argibay, Enrique; Fréty, R.; Brandão, Soraia Teixeira

doi:10.1016/j.cattod.2017.06.027

Cited by 50 publications

(29 citation statements)

References 35 publications

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“…The reaction proceeds at a lower temperature than the gas-phase partial oxidation route [17][18][19][20], thus offering many advantages such as a reduction of undesired by-products and the ability to control the process temperature [21][22][23][24]. The catalysts used for this reaction usually contain group VIII transition metals, such as rhodium [25,26], ruthenium [27,28], platinum [29,30], palladium [31,32], nickel [33,34], iridium [35,36], and cobalt [37,38]. The reaction can proceed in short contact time reactors under high-temperature conditions [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Computational Fluid Dynamics Modeling of the Catalytic Partial Oxidation of Methane in Microchannel Reactors for Synthesis Gas Production

Chen

Song

2018

Processes

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This paper addresses the issues related to the favorable operating conditions for the small-scale production of synthesis gas from the catalytic partial oxidation of methane over rhodium. Numerical simulations were performed by means of computational fluid dynamics to explore the key factors influencing the yield of synthesis gas. The effect of mixture composition, pressure, preheating temperature, and reactor dimension was evaluated to identify conditions that favor a high yield of synthesis gas. The relative importance of heterogeneous and homogenous reaction pathways in determining the distribution of reaction products was investigated. The results indicated that there is competition between the partial and total oxidation reactions occurring in the system, which is responsible for the distribution of reaction products. The contribution of heterogeneous and homogeneous reaction pathways depends upon process conditions. The temperature and pressure play an important role in determining the fuel conversion and the synthesis gas yield. Undesired homogeneous reactions are favored in large reactors, and at high temperatures and pressures, whereas desired heterogeneous reactions are favored in small reactors, and at low temperatures and pressures. At atmospheric pressure, the selectivity to synthesis gas is higher than 98% at preheating temperatures above 900 K when oxygen is used as the oxidant. At pressures below 1.0 MPa, alteration of the dimension in the range of 0.3 and 1.5 mm does not result in significant difference in reactor performance, if made at constant inlet flow velocities. Air shows great promise as the oxidant, especially at industrially relevant pressure 3.0 MPa, thereby effectively inhibiting the initiation of undesired homogeneous reactions.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Computational Fluid Dynamics Modeling of the Catalytic Partial Oxidation of Methane in Microchannel Reactors for Synthesis Gas Production

Chen

Song

2018

Processes

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“…Teknologi baru sedang terus dikembangkan untuk mengeksploitasi bahan mentah ini dengan lebih baik, di mana secara umum langkah awal proses yang digunakan adalah produksi syngas [4]. Adapun rute alternatif potensial untuk produksi syngas adalah salah satunya Oksidasi Parsial Metana (OPM) [5] di mana prosesnya membutuhkan material yang dapat mengatur jumlah oksigen yang bereaksi agar tidak terjadi oksidasi sempurna, seperti membran mixed ionic and electronic conducting (MIEC) berbahan dasar oksida perovskit [6] salah satunya adalah La1-…”

Section: Pendahuluanunclassified

Fabrikasi Membran Asimetris La0,7Sr0,3Co0,2Fe0,8O3-δ (LSCF 7328) Dengan Penambahan Aditif Polietilen Glikol (PEG)

Khoiroh

Utomo

Fansuri

2019

JSSITS

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Tujuan dilakukannya penelitian ini adalah untuk mengkaji pengaruh berat molekul Polietilen glikol (PEG) terhadap morfologi pori membran prekursor asimetris oksida perovskit La0,7Sr0,3Co0,2Fe0,8O3-δ (LSCF 7328). Membran dipreparasi menggunakan metode tape casting berbasis inversi fasa menggunakan N-metil 2 pirolidon (NMP) sebagai pelarut, air sebagai koagulan, dan polietersulfon (PESf) sebagai polimer pengikat. PEG adalah polimer yang bersifat hidrofilik sehingga pada penelitian ini dijadikan sebagai aditif. Modifikasi morfologi pori memberikan peranan penting untuk meningkatkan kinerja membran khususnya permeasi oksigen. Variasi berat molekul PEG (dalam satuan Dalton/Da) yang digunakan adalah 300, 600, dan 1500 Dalton pada konsentrasi 3%. Karakterisasi kristal perosvkit dengan XRD, sedangkan morfologi dan struktur pori membran diamati dengan Scanning Electron Microscope (SEM). Hasil SEM menunjukkan bahwa semua membran berhasil terbentuk asimetris dengan pori yang berbentuk finger-like dan sponge-like dengan lapisan rapat yang tipis, hal ini juga menunjukkan bahwa penambahan PEG dapat berperan sebagai agen pembentuk pori di mana berat molekul PEG sebanding dengan besarnya ukuran pori dan kekerasan membran namun berbanding terbalik dengan volume pori dan porositas membran. Kata Kunci-Membran asimetris, konfigurasi pori, perovskit; polietilen glikol.

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“…On the other hand, the type of the support is important for the catalytic activity and durability [8][9]. Alumina, silica, and titania is widely known as a catalyst support.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Mardwita

Yusmartini

Wisudawati

2020

Bull. Chem. React. Eng. Catal.

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A series of alumina supported cobalt and chromium catalysts with different metal loadings were prepared by impregnation method. Six types of alumina supported cobalt and chromium catalysts contained 5 wt%, 10 wt%, and 15 wt% loadings were produced and tested in methane oxidation. The catalysts were characterized by using x-ray diffraction (XRD) and carbon monoxide chemisorption (CO chemisorption). The XRD results do not confirmed any features of cobalt and chromium metal. The metal sizes for both catalysts were larger in high loading as shown by CO chemisorption results. Methane conversion results showed that the conversion increases with increasing the metal loading, however supported chromium catalysts were higher in activities compared to supported cobalt catalysts. Thermal stability tests on 15 wt% Co/Al and 15 wt% Cr/Al catalyst showed that supported chromium catalyst is more stable and maintain the particle size due to its strong interaction with support, while supported cobalt catalyst decrease in methane conversion due to deactivation of the catalyst. Copyright © 2020 BCREC Group. All rights reserved

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Perovskite as catalyst precursors in the partial oxidation of methane: The effect of cobalt, nickel and pretreatment

Cited by 50 publications

References 35 publications

RETRACTED: Computational Fluid Dynamics Modeling of the Catalytic Partial Oxidation of Methane in Microchannel Reactors for Synthesis Gas Production

RETRACTED: Computational Fluid Dynamics Modeling of the Catalytic Partial Oxidation of Methane in Microchannel Reactors for Synthesis Gas Production

Fabrikasi Membran Asimetris La0,7Sr0,3Co0,2Fe0,8O3-δ (LSCF 7328) Dengan Penambahan Aditif Polietilen Glikol (PEG)

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

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