The Effects of CeO2 and Co Doping on the Properties and the Performance of the Ni/Al2O3-MgO Catalyst for the Combined Steam and CO2 Reforming of Methane Using Ultra-Low Steam to Carbon Ratio

Dharmasaroja, Nichthima; Ratana, Tanakorn; Tungkamani, Sabaithip; Sornchamni, Thana; Simakov, David S. A.; Phongaksorn, Monrudee

doi:10.3390/catal10121450

Cited by 20 publications

(7 citation statements)

References 57 publications

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“…In the case of 100CF-10NAM/PU_0.5 °C/min, the reduction intervals were in the range of 300–550 and 550–750 °C and the optimum reducing temperature was 600 °C. According to previous publications related to the reducibility of nickel in the Ni/MA catalyst, − three reduction peaks were typically observed in the Ni/MA catalyst. The lowest reduction temperature peak can occur in the range of 150–350 °C, corresponding to the reduction of free NiO or NiO which possesses weak integration between NiO and Al 2 O 3 support.…”

Section: Resultsmentioning

confidence: 71%

Fabrication of a Ceramic Foam Catalyst Using Polymer Foam Scrap via the Replica Technique for Dry Reforming

2022

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Megapores with spherical-like cells connected through windows and high porosities make up catalyst supports in the form of ceramic foams. These characteristics provide significant benefits for catalytic processes that are limited by mass or heat transport. This study focuses on the manufacture of ceramic foam using a polymeric sponge replica process and polymer foams as a template for catalyst supports, which are industrial waste from the packaging sector. To make ceramic foam catalysts, they were dipped in a catalyst solution, followed by a breakdown stage and a sintering process. Experiments focused on determinants that affect the desired characteristics of ceramic foams, such as the types of polymer foams that affect foam morphology, the rheology of catalyst solution that affects catalyst dispersion, and the polymer decomposition rate that affects catalytic performance during dry reforming of the methane process. The cell architectures of polyurethane and polyvinyl alcohol foams are attractive for catalyst support preparation because they have 98−99% porosity and typical cell sizes of 200 and 50 μm, respectively. The polyurethane performance was superior to the performance of polyvinyl alcohol in terms of higher porosity and better catalytic-solution absorption offering high catalyst active areas. The catalyst prepared from concentrated 10 wt % Ni/Al 2 O 3 −MgO (10NAM) slurry had the highest surface area (59.18 m 2 /g) and the highest metal oxide dispersion (5.65%). These results are relevant to the flow behavior of catalyst slurry which plays a key role in coating the catalyst gel on the polymer template. The thermal decomposition rate used to remove the polymer template from the catalyst structure is proportional to the ceramic foam structure (catalyst support structure). The slow decomposition rate bent and fractured foam-cell struts more than the faster rate. On the other hand, achieving good catalyst dispersion on catalyst supports necessitated a high sintering rate. When sintering was adjusted at a high sintering rate, the metal− particle dispersion was relatively high, around 7.44%, and the surface area of ceramic foam catalysts was 64.61 m 2 /g. Finally, the catalytic behavior toward hydrogen production through the dry reforming of methane using a fixed-bed reactor was evaluated under certain operating conditions.

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Section: Resultsmentioning

confidence: 71%

Fabrication of a Ceramic Foam Catalyst Using Polymer Foam Scrap via the Replica Technique for Dry Reforming

2022

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“…It is known that lanthanide oxides are strongly basic, , CO 2 prefers to adsorb on basic sites via acid–base interaction and, normally, weak basic sites are connected to surface hydroxyl groups, medium basic sites are ascribed to metal–oxygen pairs (Lewis acid–base pairing) (i.e., Ln 3+ –O 2– pair), and strong basic sites are associated with the low-coordination oxygen (O 2– ) anions . In this work, the catalysts obtained by the electrospinning technique show the strongest basicity and the lowest reducibility (higher CO 2 desorption and higher T m ), except for lanthanum, where the highest basicity of the sesquioxide phase (IWI samples) prevails.…”

Section: Resultsmentioning

confidence: 81%

Methane Production over Electrospun Cobalt-Lanthanide Oxide Catalysts

Branco,

Ferreira,

Martinho

2024

Energy Fuels

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The hydrogenation of CO 2 is an important reaction aimed at, among other chemicals, synthetic methane production. Herein, we report the preparation and characterization of affordable cobalt-lanthanide bimetallic oxide nanofibers and cobalt-supported catalysts, using lanthanide oxide nanofibers as supports and their catalytic behavior for the methanation of CO 2 . The best results were those obtained over the cobalt-supported catalysts using cerium and ytterbium oxide nanofibers as supports. These catalysts stand out with an activity per cobalt square meter far superior to that measured over a noble metal commercial catalyst tested under the same conditions and used as a reference. The catalysts' reducibility and acid−base properties suggest the existence of a synergism between cobalt and lanthanide species, especially the cerium and ytterbium ones, which may explain their enhanced catalytic behavior. Stability tests also show that both types of catalysts are highly stable until 350 °C (kinetic regime), which is also a major advantage since they could be a real alternative aiming at synthetic methane production via CO 2 hydrogenation at low temperatures. To the best of our knowledge, this is one of the first times that cobalt-based catalysts were tested as fibers for such a purpose.

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“…For comparison purpose, in CSCRM process, the coke resistance/removal of 10Ni-1ZrO 2 /Al 2 O 3 (CI) is more effective than those of the 10Ni-10ZrO 2 /Al 2 O 3 (SI). It can be ascribed to more oxygen surface from H 2 O activation-dissociation promoted via weak and moderate basic sites on the catalyst [50]. The coke deposition on the spent catalysts of CSCRM was determined by TPO results (Figure 9).…”

Section: Coke Depositionmentioning

confidence: 99%

The Effect of ZrO2 as Different Components of Ni-Based Catalysts for CO2 Reforming of Methane and Combined Steam and CO2 Reforming of Methane on Catalytic Performance with Coke Formation

2021

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The role of ZrO2 as different components in Ni-based catalysts for CO2 reforming of methane (CRM) has been investigated. The 10 wt.% Ni supported catalysts were prepared with ZrO2 as a support using a co-impregnation method. As a promoter (1 wt.% ZrO2) and a coactive component (10 wt.% ZrO2), the catalysts with ZrO2 were synthesized using a co-impregnation method. To evaluate the effect of the interaction, the Ni catalyst with ZrO2 as a coactive component was prepared by a sequential impregnation method. The results revealed that the activity, the selectivity, and the anti-coking ability of the catalyst depend upon the ZrO2 content, the Ni-ZrO2 interaction, basicity, and oxygen mobility of each catalyst resulting in different Ni dispersion and oxygen transfer pathway from ZrO2 to Ni. According to the characterization and catalytic activation results, the Ni catalyst with low ZrO2 content (as a promoter) presented highest selectivity toward CO owning to the high number of weak and moderate basic sites that enhance the CO2 activation-dissociation. The lowest activity (CH4 conversion ≈ 40% and CO2 conversion ≈ 39%) with the relatively high quantity of total coke formation (the weight loss of the spent catalyst in TGA curve ≈ 22%) of the Ni catalyst with ZrO2 as a support is ascribed to the lowest Ni dispersion due to the poor Ni-ZrO2 interaction and less oxygen transfer from ZrO2 to the deposited carbon on the Ni surface. The effect of a poor Ni-ZrO2 interaction on the catalytic activity was deducted by decreasing ZrO2 content to 10 wt.% (as a coactive component) and 1 wt.% (as a promoter). Although Ni catalysts with 1 wt.% and 10 wt.% ZrO2 provided similar oxygen mobility, the lack of oxygen transfer to coke during CRM process on the Ni surface was still indicated by the growth of carbon filament when the catalyst was prepared by co-impregnation method. When the catalyst was prepared by a sequential impregnation, the intimate interaction of Ni and ZrO2 for oxygen transfer was successfully developed through a ZrO2-Al2O3 composite. The interaction in this catalyst enhanced the catalytic activity (CH4 conversion ≈ 54% and CO2 conversion ≈ 50%) and the oxygen transport for carbon oxidation (the weight loss of the spent catalyst in TGA curve ≈ 7%) for CRM process. The Ni supported catalysts with ZrO2 as a promoter prepared by co-impregnation and with ZrO2 as a coactive component prepared by a sequential impregnation were tested in combined steam and CO2 reforming of methane (CSCRM). The results revealed that the ZrO2 promoter provided a greater carbon resistance (coke = 1.213 mmol·g−1) with the subtraction of CH4 and CO2 activities (CH4 conversion ≈ 28% and CO2 conversion ≈ %) due to the loss of active sites to the H2O activation-dissociation. Thus, the H2O activation-dissociation was promoted more efficiently on the basic sites than on the vacancy sites in CSCRM.

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The Effects of CeO2 and Co Doping on the Properties and the Performance of the Ni/Al2O3-MgO Catalyst for the Combined Steam and CO2 Reforming of Methane Using Ultra-Low Steam to Carbon Ratio

Cited by 20 publications

References 57 publications

Fabrication of a Ceramic Foam Catalyst Using Polymer Foam Scrap via the Replica Technique for Dry Reforming

Fabrication of a Ceramic Foam Catalyst Using Polymer Foam Scrap via the Replica Technique for Dry Reforming

Methane Production over Electrospun Cobalt-Lanthanide Oxide Catalysts

The Effect of ZrO2 as Different Components of Ni-Based Catalysts for CO2 Reforming of Methane and Combined Steam and CO2 Reforming of Methane on Catalytic Performance with Coke Formation

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