Effect of metal-support interaction on activity and stability of Ni-CeO2 catalyst for partial oxidation of methane

Singha, Rajib Kumar; Shukla, Anurag; Yadav, Aditya; Konathala, L. N. Sivakumar; Bal, Rajaram

doi:10.1016/j.apcatb.2016.09.060

Cited by 198 publications

(112 citation statements)

References 80 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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“…Moreover, as recently demonstrated for the partial oxidation of methane, the behavior of CeO 2 supported nickel catalyst is highly dependent on the catalyst preparation procedure. Irrespective of identical chemical formulation, differences in the catalyst activity and stability were observed [16,17]. However, contrary to the above literature, describing how different preparation procedures attained different support morphology, the approach of the present investigation was to use different types of synthesis to tune the nickel-support interaction.…”

Section: Introductioncontrasting

confidence: 40%

Effects of Synthesis on the Structural Properties and Methane Partial Oxidation Activity of Ni/CeO2 Catalyst

2018

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Nickel catalysts supported on homemade CeO 2 oxide were prepared by two procedures intending to achieve different degree of metal-support interaction. One method consisted of a co-precipitation that was assisted by microwave; the other method was based on a modified wetness impregnation in the presence of the organic complexing ligand, nitrilotriacetic acid (NTA). The support and catalysts were characterized by temperature programmed reduction (TPR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. Significant differences in the structure, in redox properties and in the elemental surface composition emerged. The catalytic behavior in the partial oxidation of methane was tested at atmospheric pressure, in a range of temperature between 400-800 • C, using diluted feed gas mixture with CH 4 /O 2 = 2 and GHSV = 60,000 mL g −1 h −1 . Moreover, the effect of the catalyst reduction pretreatment was investigated. The better catalytic performance of the microwave-assisted sample as compared to the NTA prepared sample was attributed to the stronger interaction of nickel with CeO 2 . Indeed, according to the structural and reducibility results, an adequate electronic contact between the metal and the support favors the formation of oxygen vacancies of ceria and inhibits the sintering of the catalyst active species, with an improvement of the catalytic performance.

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“…The researchers considered that the addition of Mo could improve the coking resistance and then enhanced the long‐term stability of Ni‐based catalyst. Singha et al investigated Ni‐nanoparticles supported on CeO 2 catalyst for the partial oxidation of methane. Different metals doped inexpensive Ni based activated carbon synergistic catalysts (Ni/AC, NiFe/AC, NiMo/AC) have been studied to evaluate the effect of dopants‐in HDO upgrading of prairie cordgrass (PCG) bio‐oil.…”

Section: Introductionmentioning

confidence: 99%

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo

et al. 2018

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Nonsulfided CeO2‐supported different metal catalysts were synthesized, characterized and evaluated in the hydrogenation of octanoic acid with a batch reactor at the temperature of 280 oC and initial H2 pressure of 3 MPa. The effect of Mo species was revealed by comparing Mo‐doped catalysts with Mo‐free catalysts. The catalytic results show that the CeO2 supported Ni catalyst doped with Mo exhibit much higher catalytic activity and octane selectivity than the catalysts without dopants. Additionally, the influences of Mo and Ni mass ratio on the conversion of octanoic acid and the selectivity of heptane and octane over CeO2‐based catalysts were also discussed. Ni species seemed beneficial for the deoxygenation reaction to form C7 alkane, while the doping of Mo favored the hydrodeoxygenation path to C8 alkane via dehydration‐hydrogenation of the octanol intermediate.

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Effect of metal-support interaction on activity and stability of Ni-CeO2 catalyst for partial oxidation of methane

Cited by 198 publications

References 80 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

Effects of Synthesis on the Structural Properties and Methane Partial Oxidation Activity of Ni/CeO2 Catalyst

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo

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Effect of metal-support interaction on activity and stability of Ni-CeO2 catalyst for partial oxidation of methane

Cited by 198 publications

References 80 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

Effects of Synthesis on the Structural Properties and Methane Partial Oxidation Activity of Ni/CeO2 Catalyst

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO2‐Supported Bimetal Catalysts: The Role of Mo

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Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo