Ni/CeO2 catalysts for methane partial oxidation: Synthesis driven structural and catalytic effects

Pantaleo, G.; Parola, Valeria La; Deganello, Francesca; Singha, Rajib Kumar; Bal, Rajaram; Venezia, Anna Maria

doi:10.1016/j.apcatb.2016.02.064

Cited by 151 publications

(61 citation statements)

References 25 publications

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“…The sample prepared by the NTA complexing route exhibits a strong peak at 343 • C and two other smaller peaks at 250 and 170 • C. The one at 343 • C is due to the reduction of small NiO particles, and those at lower temperatures are due to larger NiO particles [26]. Quite differently, the sample that was prepared by microwave-assisted co-precipitation has a broad and strong peak at 450 • C which, as previously reported for similarly prepared sample, partially overlaps with the surface ceria reduction peak [17]. The reduction of Ni(II) to Ni(0), in both samples containing 6 wt % Ni, would require 23 mL/g of H 2 .…”

Section: Characterizationsupporting

confidence: 67%

“…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: Introductionmentioning

confidence: 85%

“…The temperatures of the peaks and the corresponding volumes of the consumed hydrogen are summarized in Table 2. The support profile contains a weaker feature below 600 • C, due to the surface ceria reduction, and a strong peak at around 800 • C that was attributable to ceria bulk reduction [17]. The two catalyst profiles contain the ceria bulk peak at 800 • C and strong features between 200-600 • C of different shapes.…”

Section: Characterizationmentioning

confidence: 98%

“…reduction peak [17]. The reduction of Ni(II) to Ni(0), in both samples containing 6 wt % Ni, would require 23 mL/g of H2.…”

Section: Characterizationmentioning

confidence: 99%

“…In the synthesis, cerium nitrate hexahydrate was dissolved in ethanol, and then 10 M solution of NaOH was added dropwise until pH = 9. The obtained slurry was placed inside a conventional household microwave and was exposed to the microwaves, according to the previously published procedure [17]. Finally, the collected precipitate was washed, dried at 100 • C for 1h, and then calcined at 550 • C for 2 h. The preparation of the nickel catalysts was achieved by two methods.…”

Section: Sample Preparationmentioning

confidence: 99%

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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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Section: Characterizationsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 85%

Section: Characterizationmentioning

confidence: 98%

“…reduction peak [17]. The reduction of Ni(II) to Ni(0), in both samples containing 6 wt % Ni, would require 23 mL/g of H2.…”

Section: Characterizationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

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

2018

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Thermodynamic equilibrium analysis of oxy‐dry reforming of biogas with CO₂ sequestration using Aspen HYSYS

Rosha

Kumar

Ibrahim

2021

Asia-Pacific J Chem Eng

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Hydrocarbon reforming route has gained immense attention for producing energy‐effective renewable fuels and/or chemicals in the recent era. In this simulation study, O2 addition and CH4 recycling's effect on the dry oxidative reforming reactor's performance was investigated. Aspen HYSYS simulation software was used to assess a biogas‐to‐syngas conversion process's feasibility by integrating with the CH4 recycling loop and CO2 sequestration in a dry oxidative reforming process. Simulation runs were performed by varying the O2/CH4 ratio content from 0 to 0.20 and temperature (450 to 700°C). Results illustrated that CH4 conversion improved by re‐injecting of unreacted CH4, followed by CO2 sequestration to a great extent. In dry oxidative reforming, at stoichiometry O2/CH4 ratio of 0.17, CH4 conversion (21.7%), and CO2 conversion (3.3%) were obtained at 500°C, with 1.2 H2/CO ratio. Further, 0.308 kg mole/h of H2 could be produced with biogas (1.0 kg mole/h) at optimal parameters 500°C (temperature) and 0.17 (O2/CH4 ratio) by using recycling loop in one cycle. Thus, dry oxidative reforming coupled with the CH4 recycling unit provides a better option for syngas/H2 production and remarkably addresses high energy demand in the dry reforming process.

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Improving the Coke Resistance of Ni‐Ceria Catalysts for Partial Oxidation of Methane to Syngas: Experimental and Computational Study

Khurana

Dahiya

Negi

et al. 2023

Chemistry An Asian Journal

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The synthesis of syngas (H 2 : CO = 2) via catalytic partial oxidation of methane (CPOM) is studied over noble metal doped NiÀ CeO 2 bimetallic catalysts for CPOM reaction. The catalysts were synthesized via a controlled deposition approach and were characterized using XRD, BET-surface area analysis, H 2 -TPR, TEM, Raman and TGA analysis. The catalysts were experimentally and computationally studied for their activity, selectivity, and long-term stability. Although the pure 5Ni/CeO2 catalyst showed high initial activity (~90%) of CH 4 conversion, it rapidly deactivates around 20% of its initial activity within 140 hours of TOS. Doping of Ni/CeO 2 catalyst with noble metal was found to be coke resistant with the best-performing NiÀ Pt/CeO 2 catalyst showed ~95% methane conversion with > 90% selectivity at a temperature of 800 °C, having exceptional stability for about 300 hours of time-on-stream (TOS). DFT studies were performed to calculate the activation barrier for the CÀ H activation of methane over the Ni, Ni 3 Pt, Ni 3 Pd, and Ni 3 Ru (111) surfaces showed nearly equal activation energy over all the studied surfaces. DFT studies showed high coke formation tendency of the pure Ni (111) having a very small CÀ C coupling activation barrier (14.2 kJ/ mol). In contrast, the Ni 3 Pt, Ni 3 Pd, and Ni 3 Ru (111) surfaces show appreciably higher CÀ C coupling activation barrier (7 0 kJ/mol) and hence are more resistant against coke formation as observed in the experiments. The combined experimental and DFT study showed NiÀ Pt/CeO 2 as a promising CPOM catalyst for producing syngas with high conversion, selectivity and long-term stability suited for future industrial applications.

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Ni/CeO2 catalysts for methane partial oxidation: Synthesis driven structural and catalytic effects

Cited by 151 publications

References 25 publications

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

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

Thermodynamic equilibrium analysis of oxy‐dry reforming of biogas with CO₂ sequestration using Aspen HYSYS

Improving the Coke Resistance of Ni‐Ceria Catalysts for Partial Oxidation of Methane to Syngas: Experimental and Computational Study

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Ni/CeO2 catalysts for methane partial oxidation: Synthesis driven structural and catalytic effects

Cited by 151 publications

References 25 publications

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

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

Thermodynamic equilibrium analysis of oxy‐dry reforming of biogas with CO2 sequestration using Aspen HYSYS

Improving the Coke Resistance of Ni‐Ceria Catalysts for Partial Oxidation of Methane to Syngas: Experimental and Computational Study

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Thermodynamic equilibrium analysis of oxy‐dry reforming of biogas with CO₂ sequestration using Aspen HYSYS