Solution combustion synthesis for preparation of structured catalysts: A mini-review on process intensification for energy applications and pollution control

Specchia, Stefania; Ercolino, Giuliana; Karimi, Saeid; Italiano, Cristina; Vita, Antonio

doi:10.3103/s1061386217030062

Cited by 44 publications

(22 citation statements)

References 140 publications

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“…The innovative methodologies of PI are exploited to overcome limitations of conventional processes and develop novel processes by implementing efficient technologies that is, novel reactors, materials, separation processes, bio-materials and bio-based process routes [2,3]. The most interesting technological approach in heterogeneous catalysis is the application of structured catalysts (e.g., monoliths and foams) which paves a way for more energy and resources through efficient chemical transformations [4,5]. Monolith-and foam-structured catalysts are widely used in environmental applications for controlling both automotive and stationary emissions [6].…”

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: Introductionmentioning

confidence: 99%

“…Moreover, in the oxy-steam reforming (OSR) of biogas, the presence of oxygen improves the energy efficiency of the process by exothermic methane partial/total oxidation reactions (Equations (3) and (4)…”

Section: Introductionmentioning

confidence: 99%

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 broadening and low intensity that presents the peaks of the diffractogram of the solid Ce 0.4 Pr 0.6 O 2 , is related with the obtention of crystallites of small sizes (≅10 nm), in comparison with the sample Ce 0.2 Pr 0.8 O 2 ; due to the elimination of a large amount of gases (CO 2 , H 2 O, N 2 ) in the self‐combustion reaction, and also the thermal treatment at 800°C that allow the elimination of carbonate species that can remain after combustion process. These gases inhibit the crystallite growth and limit agglomerates, favoring the formation of nanoparticles …”

Section: Resultsmentioning

confidence: 99%

Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method

Cruz-Pacheco

Cuaspud

Vargas

et al. 2019

Int J Applied Ceramic Tech

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Nanoparticles of Ce 1−x Pr x O 2 (X: 0.6 and 0.8), were synthesized by the combustion method using citric acid as chelating and fuel agent. The X-ray diffraction patterns and Rietveld refinements confirm that samples shown as a single phase in a cubic fluorite structure, with an increase in the lattice parameter as a function of Pr concentration. The crystallite size domains obtained by the Scherrer formula, confirm values around 10 and 37 nm. The scanning electron microscopy images, show that the solids are composed of dense heterogeneous aggregates. The X-ray photoelectron spectroscopy, reveals that oxides are composed of cerium and praseodymium cations in oxidation states 4+ and 3+ respectively. The TPR-H 2 profiles indicate that cerium and praseodymium cations present in the obtained systems are completely reduced to Ce 3+ and Pr 3+ at temperatures above 790°C. The impedance spectroscopy data at room temperature showed that the conduction processes for the two systems take place at the grain boundaries. The Ce 0.2 Pr 0.8 O 2 system offer lower resistance, due to the high amount of Pr 3+ ions inserted in the structure and the high amount of oxygen vacancies formed in the synthesis process.

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“…A series of ceria‐supported nickel catalysts were produced by Vita et al where an investigation concerning the reducer's adequacy (oxalyldihydrazide, urea, carbohydrazide, and glycerol) the cerium precursor (cerium nitrate and cerium ammonium nitrate) and the nickel loading (3.1–15.6 wt%) was conducted. According to their studies, urea permits the improvement of nickel dispersion, surface area, particle size, and reducibility of the catalysts, enhancing the catalytic performances of Ni/CeO 2 catalysts over biogas oxy‐stem reforming …”

Section: Hydrogen Production Processesmentioning

confidence: 99%

“…Nickel/ruthenium‐based catalysts exhibited higher performance than systems based on nickel, particularly at low temperatures and high space velocity, as the Rh promoter allows better transfer of heat and mass. Concerning the geometry, both monolith and foam were proved to be qualified candidates for the effective manufacture of structured catalysts for reforming biogas into syngas …”

Section: Hydrogen Production Processesmentioning

confidence: 99%

Review of Recent Studies on Solution Combustion Synthesis of Nanostructured Catalysts

et al. 2018

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Solution combustion synthesis (SCS) is a relatively new method for synthesizing catalytic materials with many distinct advantages: simplicity of method, short reaction times, and the capability to regulate crystal lattice parameters and thereby the activity and selectivity of catalysts. Over the last years, SCS has been used for the production and study of a multitude of new catalytic materials. This review considers and discusses the recent developments and trends in SCS of nanocatalysts, while special attention is paid to the development and applications of nanostructured catalysts.

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Solution combustion synthesis for preparation of structured catalysts: A mini-review on process intensification for energy applications and pollution control

Cited by 44 publications

References 140 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

Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method

Review of Recent Studies on Solution Combustion Synthesis of Nanostructured Catalysts

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