Promotional effect of samarium on the activity and stability of Ni-SBA-15 catalysts in dry reforming of methane

Taherian, Zahra; Yousefpour, Mardali; Tajally, Mohammad; Khoshandam, Behnam

doi:10.1016/j.micromeso.2017.05.027

Cited by 63 publications

(22 citation statements)

References 45 publications

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“…In all cases, the used catalysts contained only few carbonaceous species on their surface. The growth of carbon nanotubes (CNTs) was observed at low frequency compared to the results reported in the literature for DRM reaction [25,26,54]. In some cases, we can see the embedding of metals particles inside CNTs, causing the partial loss of the catalytic activity.…”

Section: Catalytic Performancementioning

confidence: 64%

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Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Phan

Sane

Vasconcelos

et al. 2018

Applied Catalysis B: Environmental

139

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A B S T R A C T Hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) has all the criteria of a catalyst support, in particular its high thermal stability. However it is still less studied in the heterogeneous catalysis. For the first time, hydroxyapatite supported bimetallic Co-Ni catalysts were prepared and evaluated in the dry reforming of methane (DRM) process. Nanoparticles containing both nickel and cobalt were well formed on the surface of HAP by conventional impregnation methods. No modification of HAP structure was observed after metals deposition. DRM reaction was carried out at 700-750°C and around 1.6 bar, using a fixed-bed reactor which was fed with a mixture of 20%vol CH 4 , 20%vol CO 2 and 60%vol N 2 . CH 4 and CO 2 conversion reached up to 60 and 68% at 700°C, respectively, and 73 and 79% at 750°C, respectively during long reaction times of 50-160 h. Water as a by-product could be quantified along the catalytic reaction indicating the implication of reverse water-gas-shift reaction. TEM-EDX analysis of the used catalysts recovered after catalytic tests showed that coke deposition was limited and there was slight modification of metals particle size. The results obtained were very promising for the design of an efficient catalytic system for DRM process.

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Section: Catalytic Performancementioning

confidence: 64%

“…Conventional catalytic supports including Al 2 O 3 , MgO, TiO 2 , ZrO 2 , SiC, zeolites, and nanostructured carbons were frequently reported in the literature for DRM [24][25][26][27][28]. The combination of several metal oxides allowed improving catalytic performance [27,29,30].…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Phan

Sane

Vasconcelos

et al. 2018

Applied Catalysis B: Environmental

139

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“…Samarium-promoted Ni-SBA-15 catalysts were tested in DRM by Taherian et al [25]. The promotion with Sm resulted in enhanced stability and catalytic activity due to the increase in dispersion of NiO and its better interaction with SBA-15.…”

Section: Introductionmentioning

confidence: 99%

Syngas production from dry methane reforming over yttrium-promoted nickel-KIT-6 catalysts

Świrk

Gálvez

Motak

et al. 2019

International Journal of Hydrogen Energy

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Dry reforming of methane was studied over Ni,Y-promoted KIT-6 ordered mesoporous silicas, prepared by incipient impregnation (nickel content 12 wt.%, yttrium content of 4 wt.%, 8 wt.% or 12 wt.%). The catalysts were characterized by XRF, FT-IR, TGA/DSC-MS, N2-adsorption, TEM, HRTEM, XRD and TPR-H2. The promotion with 8 wt.% Y (Y/Si=0.05) resulted in the highest activity and H2/CO molar ratio closer to the stoichiometric value at temperatures from 600 to 750°C. The characterization results of the yttrium promoted materials showed higher reducibility of the bulk NiO, bigger Ni crystallite size after reduction and DRM test, and better dispersion of nickel in the channels of the KIT-6 support. Additionally, larger Ni particles were observed on the external surface of the support, which may be related to catalytic selectivity towards carbon forming reactions. Upon dry methane reforming the segregated phases of Niº, Y2O3, and possibly Y2Si2O7 were registered. No presence of a Ni,Y alloy was observed.

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“…First of all, the higher metal dispersion and the more active sites on the catalyst surface increase the H 2 O 2 accessibility to the reaction sites. 35 However, if the number of active sites was the only influencing factor, the 1Pb8Mn-WMon catalyst would exhibit a greater k value than 2Pb8Mn-WMon based on the TPR and H 2 chemisorption results; however, it was not. Thus, the other promotional effect of Pb 2+ , that is, transformation of Mn 2 O 3 into the MnO 2 phase, appearing in XRD, XPS and EDX patterns, was relevant.…”

Section: Resultsmentioning

confidence: 99%

“…Higher dispersions and smaller MnO 2 crystallite sizes in the presence of Pb 2+ will increase the number of accessible active sites for H 2 O 2 decomposition. 35…”

Section: Resultsmentioning

confidence: 99%

Incorporating Pb²⁺ Templates into the Crystalline Structure of MnO₂ Catalyst Supported on Monolith: Applications in H₂O₂ Decomposition

Hasanpour

Saien

2019

ACS Omega

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Several MnO2 catalysts, promoted with Pb2+ ions and supported on a wash-coated monolith (WMon), briefly, xPbyMn-WMon (x = 0, 0.5, 1.0, 1.5, 2, and 2.5 and y = 8 wt %), were prepared. The presence of Pb2+ affects the manganese oxidation state, crystalline phase, thermal resistance, metal dispersion, and catalytic performance. According to XPS spectra, XRD patterns and HRTEM images, manganese was dispersed on the monolith surface as Mn3+ and Mn4+ species in both α and β crystalline phases. The ratios of Mn4+/Mn3+ states and α/β phases were highly enhanced, and the desired PbxMn8O16 phase (coronadite) was formed. Concentrations of the defect oxygen (Mn–O–H) and oxygen vacancies, which improve the catalyst reducibility and the MnO2 reduction temperature, were also increased. Further, based on the H2 chemisorption analysis, the Pb2+ template would increase the manganese dispersion and the reaction sites. Meanwhile, the average MnO2 crystallite size was decreased from 13.26 to 8.15 nm. The optimum catalyst 1.5Pb8Mn-WMon exhibited an activity 149% more than the manganese-only catalyst in decomposition of H2O2. Evaluation of catalyst stability in the presence of Pb2+ after 10 recycles showed only a 6.8% decrease. The catalytic reaction was evaluated based on different criteria.

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Promotional effect of samarium on the activity and stability of Ni-SBA-15 catalysts in dry reforming of methane

Cited by 63 publications

References 45 publications

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Syngas production from dry methane reforming over yttrium-promoted nickel-KIT-6 catalysts

Incorporating Pb²⁺ Templates into the Crystalline Structure of MnO₂ Catalyst Supported on Monolith: Applications in H₂O₂ Decomposition

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Promotional effect of samarium on the activity and stability of Ni-SBA-15 catalysts in dry reforming of methane

Cited by 63 publications

References 45 publications

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Syngas production from dry methane reforming over yttrium-promoted nickel-KIT-6 catalysts

Incorporating Pb2+ Templates into the Crystalline Structure of MnO2 Catalyst Supported on Monolith: Applications in H2O2 Decomposition

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Incorporating Pb²⁺ Templates into the Crystalline Structure of MnO₂ Catalyst Supported on Monolith: Applications in H₂O₂ Decomposition