Direct decomposition of methane over Pd promoted Ni/SBA-15 catalysts

Pudukudy, Manoj; Yaakob, Zahira; Akmal, Zubair Shamsul

doi:10.1016/j.apsusc.2015.06.073

Cited by 105 publications

(53 citation statements)

References 55 publications

(5 reference statements)

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“…Another disorder-induced Raman signal, known as D′-band, can be found around 1610 cm -1 and appears as a shoulder of the classical G-band. The D′ mode does not exist in pure graphite, but it is observed for graphitic defects or disordered carbons [57,58]. In the second-order region of the spectra, between 2300 cm -1 and 3300 cm -1 , three main bands can be observed for the spent catalysts tested herein, i.e., the D" (2435 cm -1 ), 2D (2675 cm -1 ) and G+D (2900 cm -1 ).…”

mentioning

confidence: 74%

Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction

Charisiou

Tzounis

Sebastián

et al. 2019

Applied Surface Science

151

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catalysts were investigated for the biogas reforming reaction using CH 4 /CO 2 mixtures with minimal dilution. Stability tests at various reaction temperatures were conducted and TGA/DTG, Raman, STEM-HAADF, HR-TEM, XPS techniques were used to characterize the spent samples. Graphitized carbon allotrope structures, carbon nanotubes (CNTs) and amorphous carbon were formed on all samples. Metallic Ni 0 was recorded for all (XPS), whereas a strong peak corresponding to Ni 2 O 3 /NiAl 2 O 4 , was observed for the Ni/Al sample (650-750°C). Stability tests confirm that the Ni/LaAl catalyst deactivates at a more gradual rate and is more active and selective in comparison to the Ni/Al for all temperatures. The Ni/LaAl exhibits good durability in terms of conversion and selectivity, whereas the Ni/Al gradually loses its activity in CH 4 and CO 2 conversion, with a concomitant decrease of the H 2 and CO yield. It can be concluded that doping Al 2 O 3 with La 2 O 3 stabilizes the catalyst by (a) maintaining the Ni 0 phase during the reaction, due to higher dispersion and stronger active phase-support interactions, (b) leading to a less graphitic and more defective type of deposited carbon and (c) facilitating the deposited carbon gasification due to the enhanced CO 2 adsorption on its increased surface basic sites.

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mentioning

confidence: 74%

Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction

Charisiou

Tzounis

Sebastián

et al. 2019

Applied Surface Science

151

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“…Therefore, it is necessary to develop an alternative fuel that can eliminate the energy scarcity for the nearby future [1,2]. Hydrogen is expected as the most promising energy carrier because of its environmental friendly nature [3]. Furthermore pure hydrogen has wide applications in different fields such as fuel cell technology, oil refineries, ammonia and methanol production, desulphurization, hydrogenation processes and many other fields [4e8].…”

Section: Introductionmentioning

confidence: 99%

Thermocatalytic decomposition of methane to COx-free hydrogen and carbon over Ni–Fe–Cu/Al2O3 catalysts

Bayat

Meshkani

Rezaei

2016

International Journal of Hydrogen Energy

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“…TEM images of the Ni/SBA‐15 and Ni‐Ag x /SBA‐15 catalysts are shown in Figure . All samples exhibited the hexagonally ordered array of the one‐dimensional mesoporous channels of SBA‐15 support, indicating that the mesopore structure was not destroyed (Pudukudy, Yaakob, & Akmal, ). Among of these catalysts, Ni/SBA‐15 catalyst showed clearly the poor dispersion of metal nickel, aggregation of some metal nickel particles and large particles.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of Ni‐Agx/SBA‐15 and its catalytic properties on the hydrogenation of soybean oil

Zou

Zhao

et al. 2018

J Food Process Engineering

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Ni‐Agx/SBA‐15 catalysts with different contents of the silver (Ag) promoter were prepared by the co‐impregnation method using the support of the mesoporous material SBA‐15. The Ni‐Agx/SBA‐15 catalysts were characterized by ICP‐OES, X‐ray diffraction (XRD), transmission electron microscope (TEM), and N2 adsorption–desorption isotherms. The activity of the catalysts on hydrogenation of soybean oil was evaluated. The results indicated that all the catalysts retained the hexagonally ordered structure of SBA‐15, the binding force between SBA‐15 and Ni was enhanced by the addition of the Ag promoter, and Ni was well loaded on the surface and the interior of the support that was beneficial to the improvement of catalyst activity. TEM images of the catalysts show that the addition of the silver can promote the dispersion of nickel particles over and inside the mesoporous channels of the SBA‐15 support, and the aggregation of metal nickel particles was decreased. The catalysts of Ra‐Ni (Raney Nickel), Ni/SBA‐15 and Ni‐Agx/SBA‐15 were used in the hydrogenation of soybean oil. The results show that Ni‐Ag0.15/SBA‐15 in hydrogenation processing has higher catalytic activity, and the obtained hydrogenated soybean oil has low trans fatty acids (TFAs) content. The use efficiency of the catalyst decreased to 60% after 8 cycles. Practical applications The main objective of this work was to hydrogenate soybean oil. Very encouraging results were obtained with Ni‐Ag0.15/SBA15. This preparation had a higher catalyst activity to obtain low trans fatty acid content. This finding is very valuable for fat and oil processing at the industry level.

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Direct decomposition of methane over Pd promoted Ni/SBA-15 catalysts

Cited by 105 publications

References 55 publications

Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction

Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction

Thermocatalytic decomposition of methane to COx-free hydrogen and carbon over Ni–Fe–Cu/Al2O3 catalysts

Preparation and characterization of Ni‐Agx/SBA‐15 and its catalytic properties on the hydrogenation of soybean oil

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