Combined Magnesia, Ceria and Nickel catalyst supported over γ-Alumina Doped with Titania for Dry Reforming of Methane

Al‐Fatesh, Ahmed S.; Kasim, Samsudeen Olajide; Ibrahim, Ahmed A.; Fakeeha, Anis H.; Abasaeed, Ahmed E.; Alrasheed, Rasheed; Ashamari, Rawan; Bagabas, Abdulaziz

doi:10.3390/catal9020188

Cited by 20 publications

(11 citation statements)

References 37 publications

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“…For all the temperatures studied, CO 2 conversion was higher than CH 4 conversion, suggesting the occurrence of a reverse water gas shift (RWGS) reaction. 44 At lower temperatures, the conversions are much lower than the equilibrium conversions, consistent with most prior reports for the DRM reaction. However, the numbers are comparable to the CH 4 and CO 2 conversions reported at low temperatures in other studies.…”

Section: ■ Introductionsupporting

confidence: 89%

“…As mentioned earlier, the reaction occurs at a relatively high space velocity, and the residence time is insufficient for the gasification of all carbon deposits. 44 For each of the spent catalysts, except for NiMgO-F, the formation of carbon nanotubes or fibers was observed in TEM imaging (Figure 4d−g). Such one-dimensional carbon deposits were not found in the spent NiMgO-F catalyst.…”

Section: ■ Introductionmentioning

confidence: 98%

“…In all the other samples, the H 2 consumption at lower temperatures (peaks or shoulders) is due to the reduction of Ni 2+ located at the surface of the catalyst and/or to the reduction of NiO uninfluenced by the MgO support; at higher temperatures, NiO species with strong interactions with MgO are reduced. 41,44 Upon formation of the NiO−MgO solid solution, the peak corresponding to bulk NiO usually shifts to higher temperature, and the reduction of Ni 2+ becomes more difficult. Thus, the broad consumption of hydrogen at ∼800 °C for NiMgO-FI and NiMgO-CI might be attributed to the reduction of Ni 2+ cations inserted into the lattice of MgO.…”

Section: ■ Introductionmentioning

confidence: 99%

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Single-Step Flame Aerosol Synthesis of Active and Stable Nanocatalysts for the Dry Reforming of Methane

Mohammadi

Shah

Dhandapani

et al. 2021

ACS Appl. Mater. Interfaces

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We introduce a flame-based aerosol process for producing supported non-noble metal nanocatalysts from inexpensive aqueous metal salt solutions, using catalysts for the dry reforming of methane (DRM) as a prototype. A flame-synthesized nickel-doped magnesia (MgO) nanocatalyst (NiMgO-F) was fully physicochemically characterized and tested in a flow reactor system, where it showed stable DRM activity from 500 to 800 °C. A kinetic study was conducted, and apparent activation energies were extracted for the temperature range of 500−650 °C. It was then compared with a Ni-decorated MgO nanopowder prepared by wet impregnation of (1) flame-synthesized MgO (NiMgO-FI) and (2) a commercial MgO nanopowder (NiMgO-CI) and with (3) a NiMgO catalyst prepared by co-precipitation (NiMgO-CP). NiMgO-F showed the highest catalytic activity per mass and per metallic surface area and was stable for continuous H 2 production at 700 °C for 50 h. Incorporation of potential promoters and co-catalysts was also demonstrated, but none showed significant performance improvement. More broadly, nanomaterials produced by this approach could be used as binary or multicomponent catalysts for numerous catalytic processes.

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Section: ■ Introductionsupporting

confidence: 89%

Section: ■ Introductionmentioning

confidence: 98%

Section: ■ Introductionmentioning

confidence: 99%

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Single-Step Flame Aerosol Synthesis of Active and Stable Nanocatalysts for the Dry Reforming of Methane

Mohammadi

Shah

Dhandapani

et al. 2021

ACS Appl. Mater. Interfaces

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“…The reduction behavior of the catalysts was examined via an AutoChem-II Micromeritics device. The method used to analyze was described in our paper [5].…”

Section: Tprmentioning

confidence: 99%

“…Dry reforming of methane (DRM) uses a favorable reaction that transforms two greenhouse gases, methane and carbon dioxide, into a synthesis gas, which is a beneficial product [1][2][3][4][5]. Moreover, DRM can be a potential process for the improvement of biogas composed largely by CO 2 and CH 4 [6,7].…”

Section: Introductionmentioning

confidence: 99%

Dry Reforming of Methane Using Ce-modified Ni Supported on 8%PO4 + ZrO2 Catalysts

et al. 2020

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Dry reforming of methane (DRM) was studied in the light of Ni supported on 8%PO 4 + ZrO 2 catalysts. Cerium was used to modify the Ni active metal. Different percentage loadings of Ce (1%, 1.5%, 2%, 2.5%, 3%, and 5%) were tested. The wet incipient impregnation method was used for the preparation of all catalysts. The catalysts were activated at 700 • C for 1 2 h. The reactions were performed at 800 • C using a gas hourly space velocity of 28,000 mL (h·gcat) −1 . X-ray diffraction (XRD), N 2 physisorption, hydrogen temperature programmed reduction (H 2 -TPR), temperature programmed oxidation (TPO), temperature programmed desorption (TPD), and thermogravimetric analysis (TGA) were used for characterizing the catalysts. The TGA analysis depicted minor amounts of carbon deposition. The CO 2 -TPD results showed that Ce enhanced the basicity of the catalysts. The 3% Ce loading possessed the highest surface area, the largest pore volume, and the greatest pore diameter. All the promoted catalysts enhanced the conversions of CH 4 and CO 2 . Among the promoted catalysts tested, the 10Ni + 3%Ce/8%PO 4 + ZrO 2 catalyst system operated at 1 bar and at 800 • C gave the highest conversions of CH 4 (95%) and CO 2 (96%). The stability profile of Cerium-modified catalysts (10%Ni/8%PO 4 + ZrO 2 ) depicted steady CH 4 and CO 2 conversions during the 7.5 h time on stream.Catalysts 2020, 10, 242 2 of 16 the dry reforming of CH 4 . They tested the catalytic activity over La 0.4 M 0.6 Al 0.2 Ni 0.8 O 3 (M = Pt, Pd, Ru, Rh, Ir) perovskite-type oxides with a surface area of 3.26-4.14 m 2 /g. It was obtained that the La 0.4 Rh 0.6 Al 0.2 Ni 0.8 O 3 catalyst revealed the best catalytic performance due to its high surface area, surface oxygen concentration, and good low-temperature reducibility. El Hassan et al. [18] studied the influence of Rh (0.2 and 0.5 wt %) to the Co/SBA-15 catalyst in the catalytic performance of dry reforming of CH 4 . It was found that Rh favored Co stabilization in the mesopores and was reduced at a much lower temperature. The nature of coke was affected and less γ-carbon formed on the Rh-containing sample. However, because of the high prices and limited availability of noble metals, the research has also focused on transition metals such as Co, Ni, Ti, which are broadly used for this process because of their high activity [19]. However, these catalysts are prone to quick deactivation due to coke deposition. Within the catalysts, Ni depicted the greatest performance due to its strong ability to break C-C/C-H bonds and activate CH 4 [20]. AKri et al. [21] elaborated the dry reforming of CH 4 employing atomically dispersed Ni atoms, stabilized by interaction with Ce-doped hydroxyapatite. Their results evidenced that the catalyst was very active and that isolated Ni atoms were inherently coke resistant. Ce doping of hydroxyapatite brought strong metal-support interactions which stabilized Ni single atoms toward sintering and favored the selective activation of only the first C-H bond in CH 4 . Goula et al. [22] inves...

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Effect of Contact Time on Carbon Deposition and Catalytic Activity of Nickel Alumina Catalysts for Dry Reforming of Methane

Charan Nayak,

Sengupta,

Deo

2024

ChemistrySelect

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Dry reforming of methane (DRM) reaction is advantageous in producing syngas with a low H2/CO, relevant to many industries. Effect of contact time on catalytic activity and carbon deposition is studied for DRM using Ni−Al catalysts, along with the effect of metal loading, reaction temperature, and reactant partial pressure (CO2/CH4). Maximum CH4 conversion (58 %) and CO2 (59 %) were achieved at a higher contact time of 4.009 kg‐cat . h/kgCH4. A maximum of 46 % CH4 conversion was achieved at 1023 K with a contact time of 0.134 kg‐cat . h/kgCH4. Higher CH4 and CO2 conversion were achieved with an excellent H2 and CO yield due to the RWGS reaction with increased metal (Ni) loading (10–30 wt . %). When the reactant partial pressure (CO2) changed from 0.1–0.3, the CH4 conversion increased whereas CO2 conversion decreased. FESEM images revealed the formation of whisker‐like carbon fibers for all loadings. For the best syngas output and stability in a Ni‐based catalyst, a combination of a basic support (alumina) at a higher contact time (~4.009 kg‐cat . h/kgCH4) and a CO2/CH4 ratio of 1–1.5 at a moderate temperature of 873 K may provide best CO2 adsorption with minimal coking.

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Combined Magnesia, Ceria and Nickel catalyst supported over γ-Alumina Doped with Titania for Dry Reforming of Methane

Cited by 20 publications

References 37 publications

Single-Step Flame Aerosol Synthesis of Active and Stable Nanocatalysts for the Dry Reforming of Methane

Single-Step Flame Aerosol Synthesis of Active and Stable Nanocatalysts for the Dry Reforming of Methane

Dry Reforming of Methane Using Ce-modified Ni Supported on 8%PO4 + ZrO2 Catalysts

Effect of Contact Time on Carbon Deposition and Catalytic Activity of Nickel Alumina Catalysts for Dry Reforming of Methane

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