Mixed reforming of methane over Ni–K/CeO2–Al2O3: Study of catalyst performance and reaction kinetics

Karemore, Ashvin L.; Sinha, Renu; Chugh, Parivesh; Vaidya, Prakash D.

doi:10.1016/j.ijhydene.2020.11.221

Cited by 11 publications

(8 citation statements)

References 26 publications

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“…During the kinetic evaluation of a Ni/CeO2-Al2O3 catalyst at a reaction temperature between 700 and 800 °C, the values of apparent activation energy (Ea) for the rate of consumption of CH4 and CO2 were estimated to be 20.94 kJ/mol and 27.53 kJ/mol respectively. These values were in agreement with those reported by Karemore et al [6]. The authors indicated that this tendency may be ascribed to the greater sensitivity of CO2 to temperature fluctuations than CH4.…”

Section: Power Law Kinetic Modellingsupporting

confidence: 93%

“…Dry reforming of methane (DRM) is a method used for producing syngas that involves effective utilization of two greenhouse gases namely CH4 and CO2 [6], [7]. Steam methane reforming (SMR) technique, a two-step reforming method along with Autothermal reforming (ATR) technique are considered to be conventional reforming approaches widely utilized in industrial sector.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic study of combined steam and CO2 reforming of methane over Ni-Sr/MgO-ZrO2 catalyst

2023

Sustainable Processes and Clean Energy Transition

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Abstract. Combined steam and CO2 reforming of methane (CSCRM) has gained increasing attention as a potential solution to mitigate global warming and addressing the demand for alternative energy resources. In this study, the reaction kinetics of CSCRM over high-performance Ni-Sr/MgO-ZrO2 bimetallic catalyst is investigated in a fixed bed reactor. The rate of reaction was analyzed at a temperatures ranging from 700-800℃ and reactant partial pressures of CH4, CO2 and H2O ranging from 5-50 kPa. The apparent activation energies for CH4 and CO2 consumption were found to be 20.94 kJ/mol and 27.53 kJ/mol respectively. The experimental results obtained were then fitted with a Power Law kinetic model and showed good agreement with R2 values of 0.86-0.91.

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Section: Power Law Kinetic Modellingsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Kinetic study of combined steam and CO2 reforming of methane over Ni-Sr/MgO-ZrO2 catalyst

2023

Sustainable Processes and Clean Energy Transition

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“…Next, by using eq , apparent activation energies of 268.6, 163.1, 138.9, 128.6, and 72.2 kJ/mol are determined for Ni-TiO 2 , Ni-ZrO 2 , Ni-CeO 2 , Ni-Ce 0.5 Zr 0.5 O 2 , and Ni-Ce 0.5 Ti 0.5 O 2 , respectively (Figure ). According to the literature, − the apparent activation energies for CH 4 conversion in CSCRM generally varied from 26.7 to 266 kJ/mol depending on the catalysts used, e.g., 266 kJ/mol for Ni-CeO 2 /MgAl 2 O 4 , 33.3 kJ/mol for Ni-K/CeO 2 -Al 2 O 3 , 99.4 kJ/mol for Ni/La-Co(3)/Al 2 O 3 , and 26.7 kJ/mol for Ni/Al 2 O 3 . Thus, our results are in agreement with the literature data.…”

Section: Resultssupporting

confidence: 58%

Syngas Production via Combined Steam and Carbon Dioxide Reforming of Methane over Ni-Ce_xM_1–xO₂ (M = Ti or Zr) Catalysts

Zhao

Cheng

et al. 2022

Ind. Eng. Chem. Res.

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A series of Ni-Ce x Zr1–x O2 and Ni-Ce x Ti1–x O2 catalysts with varying Ce/Zr and Ce/Ti molar ratios (x = 0, 0.25, 0.5, 0.75, and 1) were synthesized using a sol–gel method and applied to combined steam and carbon dioxide reforming of methane (CSCRM). Ni-Ce0.5Zr0.5O2 and Ni-Ce0.5Ti0.5O2 had the highest apparent activity and stability for CSCRM in their own series, owing to small Ni particles, strong metal–support interaction, and high oxygen vacancy concentration. A kinetic analysis revealed the dependence of the specific activity for CH4 conversion upon the ratio of oxygen vacancy concentration to Ni dispersion of catalyst, indicating the synergetic effect of oxygen vacancies and active Ni sites for CSCRM. Among all catalysts studied, Ni-Ce0.5Ti0.5O2 showed the best CSCRM performance, with initial CH4 and CO2 conversions of 63.0 and 50.5%, respectively, initial H2 and CO yields of 61.3 and 59.1%, respectively, and initial H2/CO ratio of 1.65 at 750 °C, 0.5 MPa and gas hourly space velocity of 84,000 N mL/(g h).

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“…It can be divided to three types: Langmuir-Hinshelwood based models [42][43][44][45] ; first order in methanebased models [46][47][48][49] ; power law-based models. 23,30,50,51 The simplest mathematical approach used in the literature are based in the power law model, which depends on the first order in methane and water vapor. In the present work, the following reaction rate expression for the overall SMR reaction is considered:…”

Section: Kineticsmentioning

confidence: 99%

“…Several models exist in the literature to describe the SMR reaction. It can be divided to three types: Langmuir–Hinshelwood based models 42‐45 ; first order in methane‐based models 46‐49 ; power law–based models 23,30,50,51 . The simplest mathematical approach used in the literature are based in the power law model, which depends on the first order in methane and water vapor.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Performance evaluation of methane‐fueled reactor for hydrogen production: Experimental permeability measurements and reactive flow modeling

Settar

Perazzo

Chetehouna

2022

Intl J of Energy Research

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In this research, an evaluation of the performance improvement of a new reactor configuration for steam methane reforming (SMR) is carried out through a numerical-experimental approach. Two configurations of M-PCR have been studied numerically to compare the benefits. The first one consists of a conventional micro planar cell reactor (noted clear M-PCR), which is impregnated in its central axis in the direction of gas mixture flow by Ni/Al 2 O 3 catalyst. The second M-PCR configuration is equipped with nickel-based metal foam (MF) (noted M-PCR MF), which supports similar catalyst layer as for clear M-PCR configuration. The same operating conditions and catalyst weight density are set. 2D numerical solution of the transport equations was performed with a homemade code based on FORTRAN language to explore the heat and mass transfer during the SMR process. To better evaluate the nickel-based MF effects, permeability coefficients, that is, Darcy and inertial coefficients, were first measured using an experimental bench for hydrodynamic characterization of porous media. Comparison has showed that M-PCR MF configuration provides a significant enhancement in terms of hydrogen yield (73,25%). Furthermore, the catalyst layer length could be reduced by four times compared to conventional M-PCR due to MF implementation, leading to important economic improvement while keeping an interesting SMR efficiency.

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Mixed reforming of methane over Ni–K/CeO2–Al2O3: Study of catalyst performance and reaction kinetics

Cited by 11 publications

References 26 publications

Kinetic study of combined steam and CO2 reforming of methane over Ni-Sr/MgO-ZrO2 catalyst

Kinetic study of combined steam and CO2 reforming of methane over Ni-Sr/MgO-ZrO2 catalyst

Syngas Production via Combined Steam and Carbon Dioxide Reforming of Methane over Ni-Ce_xM_1–xO₂ (M = Ti or Zr) Catalysts

Performance evaluation of methane‐fueled reactor for hydrogen production: Experimental permeability measurements and reactive flow modeling

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Mixed reforming of methane over Ni–K/CeO2–Al2O3: Study of catalyst performance and reaction kinetics

Cited by 11 publications

References 26 publications

Kinetic study of combined steam and CO2 reforming of methane over Ni-Sr/MgO-ZrO2 catalyst

Kinetic study of combined steam and CO2 reforming of methane over Ni-Sr/MgO-ZrO2 catalyst

Syngas Production via Combined Steam and Carbon Dioxide Reforming of Methane over Ni-CexM1–xO2 (M = Ti or Zr) Catalysts

Performance evaluation of methane‐fueled reactor for hydrogen production: Experimental permeability measurements and reactive flow modeling

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Syngas Production via Combined Steam and Carbon Dioxide Reforming of Methane over Ni-Ce_xM_1–xO₂ (M = Ti or Zr) Catalysts