Analysis of Ru/La-Al2O3 catalyst loading on alumina monoliths and controlling regimes in methane steam reforming

Ashraf, Muhammad Arsalan; Sánz, Oihane; Italiano, Cristina; Vita, Antonio; Montes, Mario; Specchia, Vito

doi:10.1016/j.cej.2017.11.154

Cited by 47 publications

(21 citation statements)

References 76 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%

“…As previously reported [31], the characteristic time analysis is widely used to investigate physical and chemical processes involved in structured catalysts. A detailed explanation of the calculations is provided in the Supplementary Materials.…”

Section: Evaluation Of External and Internal Mass Transfer Limitationsmentioning

confidence: 99%

“…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: Evaluation Of External and Internal Mass Transfer Limitationsmentioning

confidence: 99%

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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“…Other research groups also investigated the feasibility of ceramic supports different from SiC for the intensification of MSR. Ashraf et al used ceramic monoliths (α-alumina) with square channels (100 cpsi) and hexagonal channels (170 cpsi), diameter 9 mm, and length 30 mm, loaded with 100/150/200/250 mg of catalyst (Ru(1.5 wt %)/La(3 wt %)-Al 2 O 3 ) [99]. The results evidenced that the better performance in terms of methane conversion, in all of the tested conditions (temperature range 600-900 • C, WHSV = 27-368 NL h −1 gcat, molar steam to carbon ratio S/C = 3.0) was obtained with the catalyst loading of 100 mg (washcoat thickness of 58.5 µm) and 150 mg (washcoat thickness of 78.9 µm).…”

Section: Ceramic Carriersmentioning

confidence: 99%

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

2020

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Hydrogen is an important raw material in chemical industries, and the steam reforming of light hydrocarbons (such as methane) is the most used process for its production. In this process, the use of a catalyst is mandatory and, if compared to precious metal-based catalysts, Ni-based catalysts assure an acceptable high activity and a lower cost. The aim of a distributed hydrogen production, for example, through an on-site type hydrogen station, is only reachable if a novel reforming system is developed, with some unique properties that are not present in the large-scale reforming system. These properties include, among the others, (i) daily startup and shutdown (DSS) operation ability, (ii) rapid response to load fluctuation, (iii) compactness of device, and (iv) excellent thermal exchange. In this sense, the catalyst has an important role. There is vast amount of information in the literature regarding the performance of catalysts in methane steam reforming. In this short review, an overview on the most recent advances in Ni based catalysts for methane steam reforming is given, also regarding the use of innovative structured catalysts.

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Performance and Controlling Regimes Analysis of Methane Steam Reforming on Ru/γ-Al2O3 Cordierite Monoliths

Quintero

Babar

Specchia

2020

Sustainable Development for Energy, Power, and Propulsion

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Analysis of Ru/La-Al2O3 catalyst loading on alumina monoliths and controlling regimes in methane steam reforming

Cited by 47 publications

References 76 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

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

Performance and Controlling Regimes Analysis of Methane Steam Reforming on Ru/γ-Al2O3 Cordierite Monoliths

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