Kinetic model of K–Ni/α-Al2O3 catalyst for oxidative reforming of methane determined by genetic algorithm

Omata, Kohji; Kobayashi, Seishiro; Horiguchi, Junpei; Kobayashi, Yasukazu; Yamazaki, Yuichiro; Yamada, Masahito

doi:10.1016/j.apcata.2012.03.014

Cited by 13 publications

(2 citation statements)

References 21 publications

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“…The grid search algorithm (Figure S8) is applied to solve these differential equations. Grid search , is essentially an optimization to guess the closest set of parameters by minimizing the grid size with every iteration until it zeroes in on the optimum set of parameters through trial-and-error. To solve our rate equations, the protocol of the grid search algorithm is conducted by inputting a range of rate constants.…”

Section: Results and Discussionmentioning

confidence: 99%

Molecular-Vapor-Assisted Low-Temperature Growth of Graphene Nanoribbons

et al. 2023

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Conventional on-surface synthesis under ultrahigh vacuum deposition has been used to synthesize various types of graphene nanoribbons (GNRs). The dehydrogenation reaction from a prepolymer to GNR requires catalysis with a metal substrate at high temperatures, which suffers from undesired side reactions that decompose introduced functional substituents during conversion to GNRs. To overcome these drawbacks, we have developed a new method, molecular-vapor-assisted low-temperature growth (MVLTG), based on a massive excess of gaseous hydrogen-accepting molecules (2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) or oxygen) relative to the prepolymer on the metal surface. MVLTG reduces the GNR growth temperature of prepolymers with the Z-type precursor, 4′,5″-dibromo-1,1′:2′,1′:2″-quaterphenyl from 500 °C, used in conventional thermal annealing, to 350 °C. To investigate the reaction mechanism of MVLTG, a kinetic study using Raman spectroscopy to obtain GNR yields as a function of the hydrogen acceptor concentration and time was in good agreement with a simulation based on the gas-2D solid-state reaction model. These studies suggest a successful "Scholl reaction" in the gas phase, in which gaseous hydrogen acceptors (DDQ and oxygen) efficiently extract hydrogens from prepolymers at lower temperatures, converting them into GNRs. Additionally, MVLTG successfully promoted dehydrogenation reactions of prepolymers made from functionalized precursors of 4′,5″-dibromo-4-butoxy-1,1′:2′,1″:2″,1″′-quaterphenyl or 4′,5″-dibromo-4-butoxy-1,1′:2′,1″:2″,1‴:4‴,1″-quinquephenyl, suppressing decomposition of substituents. MVLTG not only realizes a new class of GNRs but also enables unprecedented on-surface synthesis.

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Section: Results and Discussionmentioning

confidence: 99%

Molecular-Vapor-Assisted Low-Temperature Growth of Graphene Nanoribbons

et al. 2023

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“…The partial pressure of CH4, CO2 and H2O are denoted as PCH4, PCO2 and PH2O respectively while α, β and γ are the corresponding reaction orders for CH4, CO2 and H2O reactants. (Omata et al, 2012) [86] investigated the effects of preparation conditions such as calcination temperature during catalyst synthesis, the Ni content and loading of K for a K-Ni/α-Al2O3 catalyst by the L9 orthogonal array. The impregnation method was used to synthesize the catalyst.…”

Section: Kinetics and Mechanistic Of Brmmentioning

confidence: 99%

A comprehensive review on improving the production of rich-hydrogen via combined steam and CO2 reforming of methane over Ni-based catalysts

Farooqi

Yusuf

Zabidi

et al. 2021

International Journal of Hydrogen Energy

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Grüne Kohlenstoffwissenschaft: eine wissenschaftliche Grundlage für das Verknüpfen von Verarbeitung, Nutzung und Recycling der Kohlenstoffressourcen

2013

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Biomasse · Fossile Treibstoffe · Grüne Kohlenstoffwissenschaft · Kohlendioxid · Kohlenstoffkreislauf Vorwort Die allgemeinen Grundlagen der grünen Chemie sind eine Leitlinie für die Entwicklung von umweltfreundlichen Produkten und Prozessen. Es ist bekannt, dass die effiziente Nutzung der Kohlenstoffressourcen sowie das Kohlenstoffrecycling von großer Bedeutung für die nachhaltige Entwicklung unserer Gesellschaft sind und dass hierzu viele miteinander verknüpfte wissenschaftliche Aufgaben gelçst werden müssen. Im Folgenden wollen wir einen ausführlichen Überblick über das geben, was wir "grüne Kohlenstoffwissenschaft" nennen: die Verarbeitung von Kohlenstoffressourcen, ihre Verwendung und ihr Recycling. Dabei wollen wir die Definition und die vier zentralen Prinzipien der grünen Kohlenstoffwissenschaft diskutieren und einige verwandte Gebiete wie die Erdçlaufbereitung, die Herstellung von Treibstoffen und Chemikalien aus Kohle und Methan sowie die Umwandlung von Kohlendioxid und Biomasse in Treibstoffe und Chemikalien besprechen.

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Kinetic model of K–Ni/α-Al2O3 catalyst for oxidative reforming of methane determined by genetic algorithm

Cited by 13 publications

References 21 publications

Molecular-Vapor-Assisted Low-Temperature Growth of Graphene Nanoribbons

Molecular-Vapor-Assisted Low-Temperature Growth of Graphene Nanoribbons

A comprehensive review on improving the production of rich-hydrogen via combined steam and CO2 reforming of methane over Ni-based catalysts

Grüne Kohlenstoffwissenschaft: eine wissenschaftliche Grundlage für das Verknüpfen von Verarbeitung, Nutzung und Recycling der Kohlenstoffressourcen

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