Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material

Cunha, Adelino F.; Morales‐Torres, Sergio; Pastrana‐Martínez, Luisa M.; Martins, António A.; Mata, Teresa M.; Caetano, Nídia S.; Loureiro, José M.

doi:10.1039/d0ra03264f

Cited by 13 publications

(6 citation statements)

References 66 publications

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“…The crystals are small-grained with defined. shape and size, which is in line with the literature [18]. The FESEM images for this catalyst showed a uniform size of catalyst pores while on the support's external surface, Ni particles were evenly distributed ZrO2 contains dispersive characteristics which reduces particle size and creates bulk oxygen vacancies.…”

Section: Fesem Analysissupporting

confidence: 88%

Syngas production via dry reforming of methane over Ni/MgO-ZrO₂ catalyst

Farooqi,

Abdullah,

Hasnain

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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This study intended to evaluate the catalytic activity of Ni/MgO-ZrO2 to produce syngas through dry reforming of methane (DRM). The catalyst was prepared by using co-precipitation method followed by impregnation of Ni metal. XRD, BET and FESEM were used to analyze the physicochemical characteristics of the prepared catalyst. A stainless steel vertical reactor fixed with a catalyst bed inside was used to run the DRM process at 800°C, 1 atm and 1:1:1 ratio of CO2:CH4:N2. From the three catalysts studied, Ni/MgO-15%ZrO2 had the maximum conversion for CH4 and CO2 compared to the other two catalysts. The high conversion achieved was because of zirconium oxide. The result obtained from the DRM reaction was further supported by the characterization results, which included average particle size, the morphology of the catalyst, and catalyst peaks.

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Section: Fesem Analysissupporting

confidence: 88%

Syngas production via dry reforming of methane over Ni/MgO-ZrO₂ catalyst

Farooqi,

Abdullah,

Hasnain

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…The addition of alkaline and alkaline earth metal promoters or metal oxide promoters (K, Mg, etc.) increasing the basicity of catalyst [10,11] that can prevent methane cracking. Perovskite materials have been utilized as promoters or co-active species.…”

Section: Introductionmentioning

confidence: 99%

Study of Ni-Co-ZrO2/Al2O3 Catalysts for Carbon Dioxide Reforming of Methane at Low CO2

Ratana,

Thongdee,

Sawansombut

et al. 2024

Trends Sci

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This work studied the composition of Ni-Co-ZrO2/Al2O3 catalyst on properties and efficiency of catalysts for carbon dioxide reforming of methane (CMR) when CO2 was fed as the limiting reagent and CH4 as the excess reactant. 9wt%Ni-1wt%ZrO2/Al2O3, 4.5wt%Ni-4.5%wtCo-1wt%ZrO2/Al2O3, 9wt%Co-1wt%ZrO2/Al2O3 and 7wt%Co-3wt%ZrO2/Al2O3 catalysts were prepared by wet impregnation method. The physicochemical properties of present catalysts were characterized by XRD, N2 adsorption-desorption H2-TPR and CO2-TPD. The CRM performance was determined in a tubular fixed-bed reactor at 600 °C for 6 h with limiting of carbon dioxide. The carbon deposition on spent catalysts were examined by TGA. The results showed that Co-ZrO2 catalysts provided greater activities, selectivity toward H2 and stability than Ni-ZrO2 and Ni-Co-ZrO2 catalysts. 9wt%Co-1wt%ZrO2/Al2O3 provided higher reactant conversions and H2/CO ratio than 7wt%Co-3wt%ZrO2/Al2O3 while the minimum coke formation was observed on spent 7wt%Co-3wt%ZrO2/Al2O3. It is because oxophilic properties and oxygen vacancy sites in Co-ZrO2 increase CO2 dissociative adsorption as well as oxygen transport on the catalyst surface. HIGHLIGHTS This work developed Ni-Co-ZrO2/Al2O3 catalysts for carbon dioxide reforming of methane (CMR) when CO2 is fed as the limiting reagent demonstrated petroleum refinery application. Remarkable points of this work are revealed below. Co-ZrO2 catalysts provided greater reactant activities, selectivity toward H2 and stability than Ni-ZrO2 and Ni-Co-ZrO2 The oxophilic property accompanied with oxygen vacancy sites in Co-ZrO2 increase CO2 dissociative absorption and oxygen transport on the catalyst surface. 9wt%Co-1wt%ZrO2/Al2O3 provided relative highest reactant conversions and highest H2/CO ratio. 7wt%Co-3wt%ZrO2/Al2O3 presented the minimum coke formation. GRAPHICAL ABSTRACT

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“…The advantages of the ammonia vapor diffusion impregnation method comprise low temperature and cost saving . The hierarchical Ni nanosheet catalyst represented the metal dispersion, surface interaction, and the basicity of the catalyst surface, improving the catalytic activity especially CO 2 adsorption-dissociation in the CO 2 reforming of methane. − Nevertheless, hierarchical Ni-based catalysts have been rarely studied for CSCRM reaction …”

Section: Introductionmentioning

confidence: 99%

“…26−31 Nevertheless, hierarchical Ni-based catalysts have been rarely studied for CSCRM reaction. 32 In this work, our catalysts were constructed to obtain the sintering inhibition and coke suppression with the ability of hydrogen production that can be used in ultralow temperature (600 °C) and low steam CSCRM for GTL application. Stateof-the-art for our design included the well-dispersed Ni nanoparticles accompanied by the superior selectivity toward oxygenated reactants resulting from the morphology and components.…”

Section: Introductionmentioning

confidence: 99%

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Combined Steam and CO₂ Reforming of Methane over the Hierarchical Ni-ZrO₂ Nanosheets/Al₂O₃ Catalysts at Ultralow Temperature and under Low Steam

Sumarasingha,

Tungkamani,

Ratana

et al. 2023

ACS Omega

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This research developed hierarchical 10 wt % Ni-1 wt % ZrO 2 /Al 2 O 3 catalysts for combined steam and CO 2 reforming of methane (CSCRM) reaction to produce syngas for gas-to-liquid (GTL) application under the ultralow temperature and low steam condition. The hierarchical nanosheet catalysts were prepared via a novel impregnation technique assisted by ammonia vapor diffusion with various times (1, 6, and 12 h) to develop the different magnitude of hierarchical nanosheets on the surface. Then, CSCRM at 600 °C was performed on the catalysts for 6 h. The results evidenced the improvement of H 2 selectivity, reaching an appropriate H 2 /CO ratio (1.9–2.0) in FT subunits in the GTL process when nanosheets existed on the surface due to the increase in H 2 O adsorption-dissociation sites. The good dispersion of hierarchical nanosheets accompanied by the ZrO 2 promoter successfully enhanced the CH 4 conversion and the coke prevention through the spread nanosheets because of the increase in the number of active sites and the surface interaction. The interaction of hierarchical nanosheets created the H 2 O activation-dissociation sites that allowed CO 2 to be selective on the oxygen vacancy sites, producing more OH* and OH* on the catalyst surface to resist the carbon deposition during CSCRM operation.

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Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material

Abstract: A Ni phase dispersed in CO2 is used with a K promoter in the BRM. The LDH support structure collapses at high temperatures, inducing large Ni crystal sizes, and disfavoring activity. The catalyst is compensated by the K promoter, and the formation of an Mg–Al-spinel.

Cited by 13 publications

References 66 publications

Syngas production via dry reforming of methane over Ni/MgO-ZrO₂ catalyst

Syngas production via dry reforming of methane over Ni/MgO-ZrO₂ catalyst

Study of Ni-Co-ZrO2/Al2O3 Catalysts for Carbon Dioxide Reforming of Methane at Low CO2

Combined Steam and CO₂ Reforming of Methane over the Hierarchical Ni-ZrO₂ Nanosheets/Al₂O₃ Catalysts at Ultralow Temperature and under Low Steam

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Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material

Abstract: A Ni phase dispersed in CO2 is used with a K promoter in the BRM. The LDH support structure collapses at high temperatures, inducing large Ni crystal sizes, and disfavoring activity. The catalyst is compensated by the K promoter, and the formation of an Mg–Al-spinel.

Cited by 13 publications

References 66 publications

Syngas production via dry reforming of methane over Ni/MgO-ZrO2 catalyst

Syngas production via dry reforming of methane over Ni/MgO-ZrO2 catalyst

Study of Ni-Co-ZrO2/Al2O3 Catalysts for Carbon Dioxide Reforming of Methane at Low CO2

Combined Steam and CO2 Reforming of Methane over the Hierarchical Ni-ZrO2 Nanosheets/Al2O3 Catalysts at Ultralow Temperature and under Low Steam

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Syngas production via dry reforming of methane over Ni/MgO-ZrO₂ catalyst

Syngas production via dry reforming of methane over Ni/MgO-ZrO₂ catalyst

Combined Steam and CO₂ Reforming of Methane over the Hierarchical Ni-ZrO₂ Nanosheets/Al₂O₃ Catalysts at Ultralow Temperature and under Low Steam