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Journals / Turkish Journal of Chemistry / 2021 / Cilt: 45 - Sayı: 4

Synthesis of $Ni/Al_2 O3$ catalysts via alkaline polyol method and hydrazine reduction method for the partial oxidation of methane

Tuba GÜRKAYNAK ALTINÇEKİÇ
Mehmet Ali Faruk ÖKSÜZÖMER
Ezgi BAYRAKDAR ATEŞ
Pages
967–985
Publication Date
2022-11-01
DOI
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AI Summary & Key Takeaways

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⚡ TL;DR(Too Long; Didn't Read)

The optimum $[N_2 H_5 OH]/[Ni]$ ratio was determined as 4.1, which means a good catalytic performance and 89.35% selectivity to H2 for the partial oxidation of methane.

📌 3 Key Takeaways

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Objective & Hypothesis:Nickel catalysts supported on $γ-Al_2 O_3$ were synthesized in the presence of polyvinylpyrrolidone (PVP) using both alkaline polyol method and hydrazine reduction method while fixing the weight ratio of $[(PVP)]/[Ni(CH_3 COO)_2 ·4H_2 O]$ at 2.
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Key Findings & Data:The effects of hydrazine $[N_2 H_5$ OH]/[Ni] and [NaOH]/[Ni] molar ratios on the structural properties of the catalysts were characterized by transmission electron microscopy (HRTEM) and by X-ray diffraction (XRD).
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Conclusion & Impact:The optimum $[N_2 H_5 OH]/[Ni]$ ratio was determined as 4.1, which means a good catalytic performance and 89.35% selectivity to H2 for the partial oxidation of methane.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Nickel catalysts supported on $γ-Al_2 O_3$ were synthesized in the presence of polyvinylpyrrolidone (PVP) using both alkaline polyol method and hydrazine reduction method while fixing the weight ratio of $[(PVP)]/[Ni(CH_3 COO)_2 ·4H_2 O]$ at 2. The effects of hydrazine $[N_2 H_5$ OH]/[Ni] and [NaOH]/[Ni] molar ratios on the structural properties of the catalysts were characterized by transmission electron microscopy (HRTEM) and by X-ray diffraction (XRD). The average of monodispersed Ni nanoparticles ranged between 8.0 and 13.0 nm. The catalytic tests were performed for the partial oxidation of methane in the temperature range of 600–800 °C under a flow rate of 157,500 L $kg^{–1}$ hr–1 with $CH_4 /O_2$ = 2. At the molar ratio of [NaOH]/[Ni] = 2, the resultant nickel nanoparticles on alumina was established completely without impurities; thus, it demonstrated the highest catalytic activity, 88% for $CH_4$ conversion, and H2 selectivity, 90.60%. The optimum $[N_2 H_5 OH]/[Ni]$ ratio was determined as 4.1, which means a good catalytic performance and 89.35% selectivity to H2 for the partial oxidation of methane.

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Cite This Article

ALTINÇEKİÇ, T. G., ÖKSÜZÖMER, M. A. F., ATEŞ, E. B. (2022). Synthesis of $Ni/Al_2 O3$ catalysts via alkaline polyol method and hydrazine reduction method for the partial oxidation of methane. Turkish Journal of Chemistry, Cilt: 45 - Sayı: 4, 967–985. https://ajindex.com/articles/602330

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