Methane oxy-steam reforming reaction: Performances of Ru/γ-Al2O3 catalysts loaded on structured cordierite monoliths

Vita, Antonio; Cristiano, Giuseppe; Italiano, Cristina; Specchia, Stefania; Cipitı̀, F.; Specchia, Vito

doi:10.1016/j.ijhydene.2014.03.114

Cited by 38 publications

(21 citation statements)

References 82 publications

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“…Figure 6 shows the weight loss of the coated F20, F30 and F40 structures after each stability cycle. In all cases, the adherence of the catalytic layer to the alumina support was very good, with weight losses lower than 5%, in agreement with the literature [7,[30][31][32]44]. Therefore, SCS allowed overcoming the exfoliation of coatings usually encountered in conventional dip-coating techniques [7,39,62].…”

Section: Adhesion Measurementssupporting

confidence: 87%

“…These characteristics enhance the catalytic performance of reforming reactions, allowing operation at high space velocity simultaneously reducing the amount of catalytic material [27,28]. Thus, the research interest in structured catalysts development is constantly growing [4,27,[29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…[7,30,43]. Recently, we proved that solution combustion synthesis (SCS) is a suitable procedure to in-situ deposit uniform, thin and high-strength catalytic layers on the surface of both ceramic monoliths [7,25,[30][31][32] and foams [7,44]. The SCS method takes the advantage of an exothermic, very quick and self-sustaining chemical reaction between metal precursors and an organic fuel (i.e., urea), resulting in the synthesis of nanocrystalline oxide powders over the surface of structured supports [4,[45][46][47].…”

Section: Introductionmentioning

confidence: 99%

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Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

et al. 2018

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: The application of ceramic foams as structured catalyst supports is clearly expanding due to faster mass/heat transfer and higher contact efficiency than honeycomb monoliths and, mainly, packed beds. In this paper, alumina open-cell foams (OCFs) with different pore density (20, 30 and 40 ppi) were coated with Rh/CeO2 catalyst via a two steps synthesis method involving: (i) the solution combustion synthesis (SCS) to in-situ deposit the CeO2 carrier and (ii) the wet impregnation (WI) of the Rh active phase. The catalytic coatings were characterized in terms of morphology and adhesion properties by SEM/EDX analysis and ultrasounds test. Permeability and form coefficient were derived from pressure drop data. Catalytic performance was evaluated towards biogas Steam Reforming (SR) and Oxy-Steam Reforming (OSR) processes at atmospheric pressure by varying temperature (800–900 °C) and space velocity (35,000–140,000 NmL·g−1·h−1). Characteristics time analysis and dimensionless numbers were calculated to identify the controlling regime. Stability tests were performed for both SR and OSR over 200 h of time-on-stream (TOS) through consecutive start-up and shut-down cycles. As a result, homogenous, thin and high-resistance catalytic layers were in situ deposited on foam struts. All structured catalysts showed high activity, following the order 20 ppi < 30 ppi ≈ 40 ppi. External interphase (gas-solid) and external diffusion can be improved by reducing the pore diameter of the OCF structures. Anderson criterion revealed the absence of internal heat transfer resistances, as well as Damköhler and Weisz-Prater numbers excluded any internal mass transfer controlling regime, mainly due to thin coating thickness provided by the SCS method. Good stability was observed over 200 h of TOS for both SR and OSR processes.

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Section: Adhesion Measurementssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

et al. 2018

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“…We deposited MgO by dipping the 1.8 g FeCralloy squares in a 10 mL aqueous solution containing magnesium nitrate (

Mg ({normalNO}_{3}) 2 \cdot 6 {normalH}_{2} O

, Sigma Aldrich) as a precursor and urea (

(CO {(NH 2)}_{2})

, Sigma Aldrich) as the organic fuel. We calculated the mass of the reagents according to Vita et al The stoichiometric ratio between oxidizing (O: total valences of oxidizers, i.e. nitrates) and reducing species (F: total valences of fuel, i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Solution combustion synthesis (SCS) is a quick process to prepare powders but can be adapted to coat nanocrystalline metal oxides, such as

{Al}_{2} O_{3}

, and zero‐valent metal onto monoliths, honeycombs, and gauzes. Ru/

{Al}_{2} O_{3}

loaded on monolith catalyst prepared by SCS for oxy‐steam reforming of methane, and palladium on zirconia‐stabilized lanthanum manganese oxide perovskite on FeCralloy gauzes for natural gas combustion are quite active.…”

Section: Introductionmentioning

confidence: 99%

Partial oxidation of methane to syngas over Pt/Rh/MgO catalyst supported on FeCralloy woven fibre

Ouzilleau

Trevisanut

et al. 2016

Can J Chem Eng

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Integrating a high-pressure syngas step with Fischer-Tropsch synthesis (FT) in a single vessel reduces investment and operating costs for Gas-toLiquids technology (GtL). Methane catalytic partial oxidation (CPOX) to produce syngas for FT is an economic opportunity for micro-refineries. Many metals and metal oxides selectively convert natural gas to CO and H 2 , but they also form coke, which must be removed intermittently, otherwise it deactivates the catalyst and can foul the reactor and process lines. Here, we prepared a 1 % mass fraction (0.01 g/g) Pt/Rh (Pt/Rh = 9) catalyst supported on MgO over FeCralloy woven fibre via solution combustion synthesis. At 900 • C, from 0.1-2 MPa, and with a 2:1 feed composition of CH 4 to O 2 , the reaction consumed all the oxygen and we obtained a H 2 /CO ratio of 2 (ideal for FT). At low pressure and a 0.1 s residence time the catalyst converted 90 % of the methane at 90 % CO selectivity. At 2 MPa, CO yield reached 50 % (< 80 % conversion and 57 % selectivity). Based on thermodynamic calculations, less than 5 % coke forms below 900 • C. At high pressure and short residence time (0.1 s), the coke yield (presumed to be coke crystallites) was 24 %. Increasing the residence time to 0.3 s reduced the amount of coke by 33 % because it is metastable.

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Influence of Different Palladium Precursors on the Properties of Solution‐Combustion‐Synthesized Palladium/Ceria Catalysts for Methane Combustion

et al. 2015

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A series of Pd/CeO 2 catalysts was prepared by solution combustion synthesis (SCS) using different Pd precursors. The powders were characterized by complementary techniques such as BET surface area measurements, X-Ray diffraction analysis, XRay photoelectron spectroscopy, temperature-programmed reduction, temperature-programmed oxidation, and high-resolution TEM. The results obtained evidenced the formation of a Pd-Ce solid solution on all SCS samples. This solid solution is in the form of an ordered supercell structure only in the SCS catalyst prepared from palladium nitrate. This was correlated to the heat of reaction between Pd(NO3)2 and the fuel. The samples were tested for methane catalytic combustion, and the reaction rates on all SCS samples were approximately twice that of the impregnated counterpart, irrespective of the precursor. This was attributed to the presence of the Pd-O-Ce solid solution, which gave rise to strong Pd-ceria interactions.

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Methane oxy-steam reforming reaction: Performances of Ru/γ-Al2O3 catalysts loaded on structured cordierite monoliths

Cited by 38 publications

References 82 publications

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

Partial oxidation of methane to syngas over Pt/Rh/MgO catalyst supported on FeCralloy woven fibre

Influence of Different Palladium Precursors on the Properties of Solution‐Combustion‐Synthesized Palladium/Ceria Catalysts for Methane Combustion

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