Cobalt aluminate spinel-derived catalysts for glycerol aqueous phase reforming

Reynoso, A.J.; Ayastuy, J.L.; Iriarte‐Velasco, Unai; Gutiérrez-Ortiz, M.A.

doi:10.1016/j.apcatb.2018.08.001

Cited by 79 publications

(34 citation statements)

References 97 publications

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“…The TPR profile of Co 3 O 4 shows two peaks. The low-temperature peak at 563 K can be attributed to the reduction of surface Co 3+ to Co 2+ and the high-temperature peak at 667 K is due to the reduction of Co 2+ to metallic cobalt[69,98,105]. For Pt/Co 3 O 4 catalysts, all the reduction peaks are shifted to lower temperatures and the catalyst showed a low temperature…”

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confidence: 97%

Noble-metal-free and Pt nanoparticles-loaded, mesoporous oxides as efficient catalysts for CO2 hydrogenation and dry reforming with methane

Sápi

Rajkumar

Ábel

et al. 2019

Journal of CO2 Utilization

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confidence: 97%

Noble-metal-free and Pt nanoparticles-loaded, mesoporous oxides as efficient catalysts for CO2 hydrogenation and dry reforming with methane

Sápi

Rajkumar

Ábel

et al. 2019

Journal of CO2 Utilization

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“…Observed in Figure 2, the diffraction peaks of reduced Co-30 matched with the standard bulk data of Co, Al 2 O 3 , and CoAl 2 O 4 , confirming the TEM result in Figure 1 (d2). [13,66] Meanwhile, for Co-10, Co-15, and Co-20, the diffraction peaks indicate the presence of Co and CoAl 2 O 4 . The peaks of Co were broadened due to small Co particle size.…”

Section: Resultsmentioning

confidence: 99%

“…XRD characterization : The composition, structure, and crystallinity of catalysts after reduction treatment were further analyzed using XRD. Observed in Figure , the diffraction peaks of reduced Co‐30 matched with the standard bulk data of Co, Al 2 O 3 , and CoAl 2 O 4 , confirming the TEM result in Figure (d2) . Meanwhile, for Co‐10, Co‐15, and Co‐20, the diffraction peaks indicate the presence of Co and CoAl 2 O 4 .…”

Section: Resultsmentioning

confidence: 99%

Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

et al. 2019

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In this study, redox exsolution method was used to synthesize Co/Co−Al spinel for dry reforming. The aim is to improve metal‐support interaction, which enhances the catalyst's stability and minimizes carbon deposition. The synthesized catalysts were observed as Co embedded on Co deficient CoAl2O4‐like spinel (denoted as Co−Al spinel). The reduction temperature was optimized at 750 °C. Investigations on the effect of Co loading revealed that optimum Co loading is needed to control the Co particle size, providing balance between limiting carbon deposition rate and preventing dissolution of Co into the support. The best performing catalyst, Co‐15, in which the molar ratio of Co and Al is 15 : 85 produced a stable 81.5 % and 87.4 % conversions for CH4 and CO2 continuously over 24 h of reaction time with 13.51 wt% of carbon deposition. The strong metal‐support interaction of Co and Co−Al spinel in Co‐15 stabilizes and prevents the sintering of Co particles, enhancing the efficiency for dry reforming reaction.

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“…Plots of all samples exhibit a broad band after 3000 cm −1 that is related to O-H vibration of moisture adsorbed on the surface of catalyst as well as a peak at 1640 cm −1 [22] structures detect in 500-700 cm −1 and 700-850 cm −1 bands, respectively [33]. The Co-O vibration peak observes below 500 cm −1 [30,31]. The vibration peaks related to sulfate groups containing S═O and S-O observe in the range of 1000-1400 cm −1 [11,37].…”

Section: Ftir Analysismentioning

confidence: 91%

“…80-1535) can observe, these peaks reduce and disappear by increasing the F/O ratio (especially more than 1.5). changes in the peaks could be related to the diffusion of cobalt ions into alumina lattice as a result of increased temperature and duration of combustion reaction [27,30].…”

Section: Xrd Analysismentioning

confidence: 99%

Fabrication of nanosized SO42−/Co–Al mixed oxide via solution combustion method used in esterification reaction: effect of urea-nitrate ratio on the properties and performance

et al. 2019

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Recently, mixed metal aluminate as a highly active, stable, and reusable nanocatalyst was extremely used in chemical reactions such as esterification. The preparation of the samples via a simple, rapid, and cost-effective method is one of the main problems on the front of the industrial application of these materials. For this purpose, the solution combustion method (SCM) was assessed for the fabrication of spinel CoAl 2 O 4 , and the effects of fuel-to-oxidizer (F/O) ratio on crystalline structure, surface functional groups, surface area, morphology, and porosity were analyzed. The activity of the samples, which was impregnated by the sulfate group was evaluated in the esterification reaction. Morphology and texture properties of the samples indicated the crystallinity, surface area, and pore diameter of CoAl 2 O 4 were enhanced by increasing the F/O ratio. It can be related to increasing the combustion reaction time and temperature. However, at F/O ratios above two, due to limited diffusion of oxygen into the reaction medium, the reaction terminated immaturely. Sulfated cobalt aluminate fabricated at F/O ratio of two was successfully synthesized in nanoscale with same particle size. Moreover, it did not show impurity in its structure that is related to the ability of the combustion method for the fabrication of pure nanocatalyst. Evaluation of the catalytic activity of the SO 4 2− /CoAl 2 O 4 nanocatalysts in the esterification reaction confirmed the results of physicochemical studies. For instance, the sample prepared at F/O ratio of two presented the highest conversion (96.7%) at methanol/oleic acid molar ratio of nine, catalyst amount of 3 wt. %, and reaction temperature and time of 120 °C and 4 h, respectively. In addition to preserving its activity for four runs (conversion > 85%), its activity was simply recovered upon regeneration by sulfate group, making it a promising alternative for industrial production of biodiesel.

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Cobalt aluminate spinel-derived catalysts for glycerol aqueous phase reforming

Cited by 79 publications

References 97 publications

Noble-metal-free and Pt nanoparticles-loaded, mesoporous oxides as efficient catalysts for CO2 hydrogenation and dry reforming with methane

Noble-metal-free and Pt nanoparticles-loaded, mesoporous oxides as efficient catalysts for CO2 hydrogenation and dry reforming with methane

Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

Fabrication of nanosized SO42−/Co–Al mixed oxide via solution combustion method used in esterification reaction: effect of urea-nitrate ratio on the properties and performance

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