Effect of interactions between Ni and Mo on catalytic properties of a bimetallic Ni-Mo/Al 2 O 3 propane reforming catalyst

Malaibari, Zuhair; Croiset, Eric; Amin, Ashraf; Epling, William S.

doi:10.1016/j.apcata.2014.11.002

Cited by 67 publications

(51 citation statements)

References 69 publications

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“…This suggests that loading of Ce in the catalyst makes the NiO-alumina interaction stronger, which consequently restricts sintering of active metal in the course of the SRP reaction. 41 This is in agreement with the XRD and TEM (Fig. 4) 43 reported that Ni and Co tend to interact with lanthanides to form a compound with higher anti-sintering ability than the corresponding Ni Co alone, which is in agreement with the stability results during reactor tests for these Ce-promoted catalysts.…”

Section: Response Surface Methods (Rsm)supporting

confidence: 89%

The effects of cobalt and cerium promoters on hydrogen production performance of alumina‐supported nickel catalysts in propane steam reforming

Fard

Bazyari

Alavi

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: The effects of Co and Ce promoters on the performance of Ni (10 wt%)-Co (0.0, 2.75, 5.5 wt%)/Ce (0.0, 5.0, 10.0 wt%)-Al 2 O 3 catalysts have been studied for steam reforming of C 3 H 8 (SRP). In this work, Ni (NO 3) 2 and Co (NO 3) 2 are coimpregnated on the co-precipitated Al 2 O 3-CeO 2 supports. X-ray diffraction, N 2 adsorption-desorption, H 2-temperature-programmed reduction, high-resolution transmission electron microscopy, scanning electron microscopy and thermogravimetric/differential thermal analysis were accomplished to explain the SRP activity of the catalysts. The performance of the resulting catalysts was evaluated under the gas hourly space velocity (GHSV) = 45 000 mL h-1 g cat −1 , T = 600°C, steam/C 3 H 8 ratio (S/C) = 3 and P = 1 atm. RESULTS: The experimental findings revealed that Ce and Co promoters markedly improved the catalyst activity, stability and H 2 yield of Ni/Al 2 O 3 catalyst. The sample with 2.75 wt% Co and 10.0 wt% Ce showed highest C 3 H 8 conversion, while maximum yield of H 2 was obtained for catalyst containing 5.5 wt% Co and 5.0 wt% Ce. CONCLUSION: Higher loadings of Co decreased C 3 H 8 conversion and catalyst stability due to more coke formation on the catalyst surface, whereas Ce significantly improved catalyst resistance to coke deposition due to the enhanced Ni metal particles distribution over the support.

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Section: Response Surface Methods (Rsm)supporting

confidence: 89%

The effects of cobalt and cerium promoters on hydrogen production performance of alumina‐supported nickel catalysts in propane steam reforming

Fard

Bazyari

Alavi

et al. 2020

J of Chemical Tech & Biotech

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“…Hence, it is expected that less than this percentage of titania could be reduced in the mixed oxide support. In the Mo containing samples, all catalysts showed reduction peaks corresponding to Mo 6+ → Mo 4+ and Mo 4+ → Mo 0 at low temperatures (400-800 K) and high temperatures (>800 K), respectively [48][49][50]. Particularly, for the 5 wt.% Mo catalysts, a peak centered at 740 K corresponded to an easily reducible Mo species, possibly in octahedral coordination [50].…”

Section: Temperature Programed Reductionmentioning

confidence: 95%

“…The TPR profile of 15 and 20 wt.% Mo catalysts presented four signals at 780, 850, 880, and 1000 K. The peaks located between 780 and 900 K could be attributed to the reduction of Mo Oh and a mixture of Mo Oh and Mo Th , respectively. The high temperature peaks (880 and 1000 K) could be caused by the presence of Mo Th and bulk MoO 3 [47,49,50]. The absence of an 850 K peak at 5 and 10 wt.% Mo would indicate that at low Mo loadings, there may not be a notorious mixture of Mo Oh and Mo Th and more Mo Oh was formed when Mo loading was augmented.…”

Section: Temperature Programed Reductionmentioning

confidence: 99%

Effect of Metal Loading in Unpromoted and Promoted CoMo/Al2O3–TiO2 Catalysts for the Hydrodeoxygenation of Phenol

et al. 2019

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This paper reports the effects of changes in the supported active phase concentration over titania containing mixed oxides catalysts for hydrodeoxygenation (HDO). Mo and CoMo supported on sol–gel Al2O3–TiO2 (Al/Ti = 2) were synthetized and tested for the HDO of phenol in a batch reactor at 5.5 MPa, 593 K, and 100 ppm S. Characterization results showed that the increase in Mo loading led to an increase in the amount of oxide Mo species with octahedral coordination (MoOh), which produced more active sites and augmented the catalytic activity. The study of the change of Co concentration allowed prototypes of the oxide species and their relationship with the CoMo/AT2 activity to be described. Catalysts were tested at four different Co/(Co + Mo) ratios. The results presented a correlation between the available fraction of CoOh and the catalytic performance. At low CoOh fractions (Co/(Co + Mo) = 0.1), Co could not promote all MoS2 slabs and metallic sites from this latter phase performed the reaction. Also, at high Co/(Co + Mo) ratios (0.3 and 0.4), there was a loss of Co species. The Co/(Co + Mo) = 0.2 ratio presented an optimum amount of available CoOh and catalytic activity since the XPS results indicated a higher concentration of the CoMoS phase than at a higher ratio.

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“…Propane can also be used as chemical feedstock, for example, upon catalytic conversion to synthesis gas by either partial oxidation or steam reforming. Several catalysts such as Ni, Pt, Rh, or bi‐metals such as Ru‐Ni, Mg‐Ni are used for propane reforming. Rhodium in particular is a very suitable catalyst as shown literature first by Huff et al.…”

Section: Introductionmentioning

confidence: 99%

Surface Reaction Kinetics of the Oxidation and Reforming of Propane over Rh/Al₂O₃ Catalysts

et al. 2017

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A multi‐step surface reaction mechanism for partial oxidation and steam reforming of propane over Rh/Al2O3 catalysts is presented. The mechanism is also applicable to model reactions of the subsystems H2/CO/H2O/CO2/O2/CH4. A stagnation–flow reactor with a catalytically coated disk is used to determine the surface reaction rate and spatial concentration profiles on top of the catalytic plate using a micro‐probe sampling technique. The reactor configuration facilitates one‐dimensional modeling of coupled diffusive and convective transport within the gas‐phase boundary layer coupled with detailed heterogeneous chemistry models of the zero‐dimensional surface. The reaction system is studied at varying inlet concentrations and temperatures. The established reaction kinetics are furthermore tested by simulation of autothermal reforming of propane in an annular reactor previously described by Pagani.

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Effect of interactions between Ni and Mo on catalytic properties of a bimetallic Ni-Mo/Al 2 O 3 propane reforming catalyst

Cited by 67 publications

References 69 publications

The effects of cobalt and cerium promoters on hydrogen production performance of alumina‐supported nickel catalysts in propane steam reforming

The effects of cobalt and cerium promoters on hydrogen production performance of alumina‐supported nickel catalysts in propane steam reforming

Effect of Metal Loading in Unpromoted and Promoted CoMo/Al2O3–TiO2 Catalysts for the Hydrodeoxygenation of Phenol

Surface Reaction Kinetics of the Oxidation and Reforming of Propane over Rh/Al₂O₃ Catalysts

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Effect of interactions between Ni and Mo on catalytic properties of a bimetallic Ni-Mo/Al 2 O 3 propane reforming catalyst

Cited by 67 publications

References 69 publications

The effects of cobalt and cerium promoters on hydrogen production performance of alumina‐supported nickel catalysts in propane steam reforming

The effects of cobalt and cerium promoters on hydrogen production performance of alumina‐supported nickel catalysts in propane steam reforming

Effect of Metal Loading in Unpromoted and Promoted CoMo/Al2O3–TiO2 Catalysts for the Hydrodeoxygenation of Phenol

Surface Reaction Kinetics of the Oxidation and Reforming of Propane over Rh/Al2O3 Catalysts

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Surface Reaction Kinetics of the Oxidation and Reforming of Propane over Rh/Al₂O₃ Catalysts