Enhanced catalytic activity of Ni on η-Al 2 O 3 and ZSM-5 on addition of ceria zirconia for the partial oxidation of methane

Osman, Ahmed I.; Meudal, Jonathan; Laffir, Fathima; Thompson, Jillian M.; Rooney, David

doi:10.1016/j.apcatb.2016.12.058

Cited by 72 publications

(40 citation statements)

References 49 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].…”

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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“…Alumina is a cost-efficient material that can be tailored to unique textural properties including high surface area and high porosity. Moreover, alumina can be used as a catalyst support in different oxidation reactions [7,8]. Therefore, optimizing Al 2 O 3 as a catalyst or a support for such processes remains a topic of great importance [9].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Osman

Abu‐Dahrieh

2018

Catal Lett

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Herein, kinetic modelling and kinetic parameters were used to study methanol dehydration to dimethyl ether reaction and revealed that the best model to fit the experimental data was the Bercic model. The dehydration reaction undergoes dissociative adsorption Langmuir-Hinshelwood mechanism of methanol on the alumina catalyst surface, with the calculated value of the activation energy was 136.7 kJ mol −1 . Moreover, the effect of different kinetic parameters such as the catalyst weight and methanol concentration or water in the feed on the catalytic performance of η-Al 2 O 3 was examined in a fixed bed reactor under the reaction conditions where the temperature ranged from 180 to 350 °C with a WHSV = 12.1 h −1 . Graphical Abstract

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“…Osman et al prepared Ni on η ‐Al 2 O 3 and ZSM‐5(80) on the addition of CeO 2 ‐ZrO 2 as oxygen storage, where Ni/CeO 2 ‐ZrO 2 /ZSM‐5(80) showed higher methane conversion than the Ni/CeO 2 ‐ZrO 2 / η ‐Al 2 O 3 catalyst with T 50% of 392 and 415 °C, respectively. This was explained by three reasons: the larger surface area, higher surface acidity, and increased interaction and interfacial area between the Ni and ZSM‐5(80) compared to the η ‐Al 2 O 3 catalyst.…”

Section: Effect Of Catalyst Componentsmentioning

confidence: 99%

“…Inhibition effect of CO added to the CPOM reaction feed. Reaction conditions: 400–700 °C with GHSV of 63 000 mL g −1 h −1 .…”

Section: Deactivation Of Cpom Catalystsmentioning

confidence: 99%

Catalytic Hydrogen Production from Methane Partial Oxidation: Mechanism and Kinetic Study

Osman

2020

Chem Eng & Technol

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The multifunctional potential of a transition and noble metal catalyst supported on either a single support or combined oxide support in the catalytic partial oxidation of methane (CPOM) is reviewed. The close interaction and interfacial area between the metal, reducible oxide, and acidic support are highlighted, which are crucial for low‐temperature CPOM. The effects of the catalyst components and their preparation methods are considered. Their impact on the catalytic performance and stability on the CPOM reaction is evaluated. The two main mechanisms of CPOM, namely, direct partial oxidation and combustion and reforming reaction, are also covered along with the most recent kinetic studies. Finally, the deactivation of the CPOM catalysts is evaluated in terms of coke and carbon deposition along with CO poisoning.

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Enhanced catalytic activity of Ni on η-Al 2 O 3 and ZSM-5 on addition of ceria zirconia for the partial oxidation of methane

Abstract: Enhanced catalytic activity of Ni on-Al2O3 and ZSM-5 on addition of ceria zirconia for the partial oxidation of methane, Applied Catalysis B, Environmental http://dx.

Cited by 72 publications

References 49 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

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Catalytic Hydrogen Production from Methane Partial Oxidation: Mechanism and Kinetic Study

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