Ni@Pd nanoparticle with core–shell structure supported over γ-Al2O3 for partial oxidation process of butane to syngas

Nasabi

2020

Int J Energy Res

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The kinetic experiments at various working conditions (ie, temperature: 500 C-900 C, pressure: 1-15 bar, H 2 O/CH 4 ratio [S/C ratio] of 1-2.5, and gas hourly space velocity of 900-1700 1/h) in the presence of LaNiO 3 perovskitetype oxide were done to consider and assess the outcome of steam methane reforming (SMR) and to build up its kinetic models depending on Langmuir-Hinshelwood method in a fixed bed reactor. The outcomes demonstrate, the methane conversion, H 2 and CO yields and formed CO 2 are affected by the working parameters. Elevated temperature is profitable for more methane conversion, H 2 and CO yield. While high temperature has a negative effect on mol % of CO 2 in outlet products. The high working pressure will not profit SMR respect to CH 4 conversion and products distribution. The efficacy of S/C ratio on the CH 4 conversion and CO yield depended on temperature range. H 2 yield considerably diminishes with an increment in S/C ratio, while the trend was reverse for CO 2 value in outlet gas. The accuracy of suggested kinetic model was evaluated by correlation and statistical tests. Outcomes exhibited that the obtained data were well anticipated through the suggested model, owning to presumption of nonideal gas phase and by utilizing reasonable equation of state of PPR78. K E Y W O R D S CH 4 conversion, H 2 and CO yields, kinetic model, LaNiO 3 perovskite-type oxide, steam methane reforming

Section: Introductionmentioning

confidence: 99%

Steam methane reforming on LaNiO ₃ perovskite‐type oxide for syngas production, activity tests, and kinetic modeling

Nasabi

2020

Int J Energy Res

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“…Based on the previous studies, ,, palladium has the most synergistic effect with nickel among noble metals. Consequently, the Ni–Pd alloy has a high catalytic performance in methane reforming due to its reasonable cost and lower deactivation rate …”

Section: Introductionmentioning

confidence: 94%

“…Although the transition metals, especially nickel, have been widely applied as an active metal in the reforming of to its appropriate cost and availability, high coke deposition is the most critical challenge of nickel catalysts in the reforming reactions. , The noble metals (i.e., Rh, Pt, Ru, and so on) are applied as proper metals for the reforming reactions due to their high catalytic activity compared to nickel, although their high cost restricts their industrial usage . Based on the previous studies, ,, palladium has the most synergistic effect with nickel among noble metals. Consequently, the Ni–Pd alloy has a high catalytic performance in methane reforming due to its reasonable cost and lower deactivation rate …”

Section: Introductionmentioning

confidence: 99%

“…Langmuir–Hinshelwood (LH), Langmuir–Freundlich (LF), and Eley–Rideal isotherms have been used widely to describe the chemisorption of reactants on the catalyst surface. − Previous studies − ,− have shown that the majority of proposed kinetic models of dry reforming and also steam reforming of methane are developed using the LH isotherm, which are well fitted to the experimental data. On the other hand, Hou and Hughes have applied the LF adsorption isotherm to develop rate equations for the kinetic model of the steam reforming of methane, showing a minor deviation from experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Modeling of Combined Steam and CO₂ Reforming of Methane over the Ni–Pd/Al₂O₃ Catalyst Using Langmuir–Hinshelwood and Langmuir–Freundlich Isotherms

Batebi

Abedini

2021

Ind. Eng. Chem. Res.

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Combined steam and CO 2 reforming of methane (CSCRM) testing was used to determine the responses of CH 4 conversion, H 2 and CO yield, and CO 2 conversion at a temperature range of 500−1000 °C, (CO 2 + H 2 O)/CH 4 ratio of 1−3, and CO 2 /H 2 O ratio of 1−3, over the Ni−Pd/Al 2 O 3 catalyst in a fixed bed reactor. The Ni−Pd/Al 2 O 3 catalyst was synthesized through the sol−gel method, and its chemical and physical properties were studied using transmission electron microscopy, scanning electron microscopy, H 2 chemisorption, and O 2 -pulse titration methods. A kinetic model for the CSCRM reaction was also developed based on Langmuir−Hinshelwood and Langmuir−Freundlich isotherms by ignoring the deactivation reactions. The results showed that experimental H 2 yield values were closer to the modeled values compared to other cases. The proposed kinetic model resulted in the highest accuracy with a mean absolute relative residual of 8.52% in predicting experimental data with a presumption of the Langmuir−Freundlich approach for derivation and also applying fugacity instead of partial pressure in rate equations.

“…In addition, it thermodynamically led to hydrogen production via steam reforming of ethanol (SRE). 4 C 2 H 5 OH + 3H 2 O ↔ 2CO 2 + 6H 2 (SRE) (R1)…”

Section: Introductionmentioning

confidence: 99%

Steam reforming of ethanol to hydrogen formation: Kinetic modeling and experimental investigations

Int J of Chemical Kinetics

2021

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To derive the kinetic model for steam reforming of ethanol, the experiment tests were accomplished at vast working conditions (i.e., temperature: 300-900 • C, pressure: 1-11 bar, and H 2 O/C 2 H 5 OH ratio (S/E) of 3-21) on the Ni-Pt/CeO 2 catalyst in a fixed bed reactor. The physicochemical properties of the prepared catalyst were investigated by x-ray fluorescence, thermal gravimetric analysis x-ray diffractometer, and N 2 adsorption/desorption Brunauer-Emmett-Teller (BET) tests. The kinetic model was developed based on the Langmuir-Freundlich approach, and the proposed mechanism included four reversible reactions on two types of the active site. The values of estimated activation energy for four reactions were in the range of reported values by various workers. The kinetic model error to anticipate the responses was 11.96% and a well forecasted H 2 yield compared to other responses. The complete ethanol conversion reached above 700 • C at 1 bar pressure irrespective of the S/E value. The variation of CO yield in terms of temperature was very low up to 700 • C. An augmentation in S/E, enhanced ethanol conversion and H 2 yield, while these trends were reversed for CO yield and CH 4 selectivity.