CO2-reforming of methane to produce syngas over Co-Ni/SBA-15 catalyst: Effect of support modifiers (Mg, La and Sc) on catalytic stability

Al‐Fatesh, Ahmed S.; Arafat, Yasir; Atia, Hanan; Ibrahim, Ahmed A.; Ha, Quan Luu Manh; Schneider, Mat­thias; M-Pohl, M.; Fakeeha, Anis H.

doi:10.1016/j.jcou.2017.08.001

Cited by 91 publications

(53 citation statements)

References 32 publications

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“…Specifically, La aids in the removal of the carbon deposits more effectively by gasification, preventing catalytic deactivation that is caused by insufficient removal of carbon species from the surface of Ni particles and the formation of stable, graphitic carbon deposits, most likely covering the surface of metal [79,80].…”

Section: Correlation Between Deactivation and The Carbon Deposited Onmentioning

confidence: 99%

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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Section: Correlation Between Deactivation and The Carbon Deposited Onmentioning

confidence: 99%

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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“…Figure 5 represents the CO 2 -TPD profiles of the catalysts. The strength of basic sites can be classified by the temperature of the corresponding desorption peak of CO 2 : weakly basic in the range of 50-200 • C, intermediate basic (200-400 • C), strongly basic (400-650 • C) and very strong basic sites (>650 • C) [35]. In fact, all these basic sites are evident from CO 2 -TPD profiles, which reveal the strong basic character of the catalysts ( Figure 5).…”

Section: Temperature-programmed Desorption Of Co 2 (Co 2 -Tpd)mentioning

confidence: 99%

Highly Selective Syngas/H2 Production via Partial Oxidation of CH4 Using (Ni, Co and Ni–Co)/ZrO2–Al2O3 Catalysts: Influence of Calcination Temperature

et al. 2019

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In this study, Ni, Co and Ni–Co catalysts supported on binary oxide ZrO2–Al2O3 were synthesized by sol-gel method and characterized by means of various analytical techniques such as XRD, BET, TPR, TPD, TGA, SEM, and TEM. This catalytic system was then tested for syngas respective H2 production via partial oxidation of methane at 700 °C and 800 °C. The influence of calcination temperatures was studied and their impact on catalytic activity and stability was evaluated. It was observed that increasing the calcination temperature from 550 °C to 800 °C and addition of ZrO2 to Al2O3 enhances Ni metal-support interaction. This increases the catalytic activity and sintering resistance. Furthermore, ZrO2 provides higher oxygen storage capacity and stronger Lewis basicity which contributed to coke suppression, eventually leading to a more stable catalyst. It was also observed that, contrary to bimetallic catalysts, monometallic catalysts exhibit higher activity with higher calcination temperature. At the same time, Co and Ni–Co-based catalysts exhibit higher activity than Ni-based catalysts which was not expected. The Co-based catalyst calcined at 800 °C demonstrated excellent stability over 24 h on stream. In general, all catalysts demonstrated high CH4 conversion and exceptionally high selectivity to H2 (~98%) at 700 °C.

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“…Two peaks were observed at 300 and 530 • C for Ni/S15, respectively, corresponding to two different NiO species. The first peak was assigned to NiO species that are weakly attached to the support, while the one at 530 • C was for the NiO species that are strongly interacting with the support [15,32]. For Co/S15, two low temperature peaks were observed for the two-step reduction of Co 3+ to Co 2+ , and then to Co 0 .…”

Section: Catalystmentioning

confidence: 99%

“…It seems that the addition of Co as an active component weakens the interaction between Ni and the support. Therefore, catalyst reduction takes place easily, and more active sites are provided for the catalytic reaction [15]. The incorporation of Zn and Ce oxides led to a better efficiency and better reduction of the active sites at lower temperatures.…”

Section: Catalystmentioning

confidence: 99%

“…CO 2 reforming of methane produces equal amounts of carbon monoxide and hydrogen which can be converted into a variety of chemicals and fuels, such as methanol and liquid fuel, via the Fischer-Tropsch process [10][11][12]. However, CO 2 reforming of methane is an endothermic reaction; it requires high temperature levels as indicated by the following reaction [13][14][15]:…”

Section: Introductionmentioning

confidence: 99%

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Nanosized Ni/SBA-15 Catalysts for CO2 Reforming of CH4

et al. 2019

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Ni, Co, and Co–Ni bimetallic catalysts supported over SBA-15 and over SBA-15 doped with Zn or Ce oxides were prepared and tested in a methane dry reforming reaction. The loading of the metals in the catalyst was 5 wt % for either mono or bimetallic catalysts. The prepared catalysts were tested in a continuous-flow fixed-bed reactor at 800 °C under atmospheric pressure. XRD, TPR, TPD, and SEM characterization techniques were employed to investigate the catalytic properties of fresh catalysts. SEM and TGA were used to study the catalytic properties of spent catalysts. A remarkable effect on the reduction properties and catalytic performance of catalysts was observed after adding Zn and Ce. Over an 8 h test, Ni/SBA-15 showed the best activity and stability. The conversion was 90% for CH4 and CO2. Co–Ni/SBA-15 and Co–Ni/Ce–SBA-15 have shown a reasonable activity and stability. Selectivity of the Ni/SBA-15 catalyst was higher than all other catalysts as indicated by the H2/CO ratio. Co/SBA-15 and Co–Ni/Zn–SBA-15 showed a low activity and selectivity. TPD–NH3 profiles indicated that doping SBA-15 with Ce and/or Zn increased the catalyst acidic sites. Ni/SBA-15 is an excellent potential catalyst for commercial methane dry reforming processes.

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CO2-reforming of methane to produce syngas over Co-Ni/SBA-15 catalyst: Effect of support modifiers (Mg, La and Sc) on catalytic stability

Cited by 91 publications

References 32 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

Highly Selective Syngas/H2 Production via Partial Oxidation of CH4 Using (Ni, Co and Ni–Co)/ZrO2–Al2O3 Catalysts: Influence of Calcination Temperature

Nanosized Ni/SBA-15 Catalysts for CO2 Reforming of CH4

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