Combustion synthesis: a novel method of catalyst preparation

Wolf, E.E.; Kumar, Anand; Mukas'yan, A. S.

doi:10.1039/9781788016971-00297

Cited by 14 publications

(15 citation statements)

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“…The solution combustion (SC) method is based on an exothermic self-sustained redox reaction. It is carried on in a homogeneous aqueous solution containing at least an oxidizing agent and a suitable fuel (used as reducing agent) [24][25][26][27][28][29]. Salts, like nitrates, metal sulphates and carbonates are chosen as oxidizing agents.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, any deviation from the stoichiometry balance affects the maximum combustion temperature and the volume of gases generated during the combustion reaction. These two parameters contribute to the tuning of the crystalline phases, the particle size, the morphology, the pore size and volume, the surface area, and the agglomeration degree [26]. Fuel-lean conditions in SC synthesis usually bring to the decrease of the maximum combustion temperature with a consequent reduction of the volume of gases evolved.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

et al. 2020

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Three series of binary metal oxide catalysts containing Ni, Cu, or Co oxides were prepared, fully characterized and tested in CO oxidation. The catalysts, with a constant transition metal loading of 10 wt%, were prepared from metal nitrates and urea mixtures by a microwave-assisted solution combustion method. The RV/OV ratio, corresponding to the stoichiometry of the reactants, calculated from their elemental oxidizing and reducing valences, was varied. In order to modify the redox character of the synthesis medium from the quantity of urea; an excess of urea was used for attaining reducing conditions, while a deficit of urea shifted the medium to oxidizing conditions. Three RV/OV ratios (0.9, 1.0, and 1.1) were selected to elaborate the different binary metal oxide catalysts, nine oxide catalysts were synthesized. Then, the influence of the stoichiometry (RV/OV ratio) on the bulk and surface properties of the binary metal oxide catalysts was investigated. Similarly, the influence of the RV/OV ratio on the CO oxidation activity was discussed and the optimal value of RV/OV ratio was identified. The results show that the increasing of the RV/OV ratio from 0.9 to 1.1, particularly in Ni- and Co-containing catalysts, induces stronger metal-aluminum interactions, in the form of aluminates phases, and that are correlated to the dramatic reduction of the CO oxidation activity. The best physicochemical properties and highest catalytic activities were achieved with the catalysts prepared in redox systems stoichiometrically balanced (RV/OV = 1). The Cu-containing catalysts presented the best catalytic activities in CO oxidation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

et al. 2020

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“…The initial phase of the CACS study concentrated on the synthesis of mixed metal oxides, transition metals, and their alloys. ,, Among the investigated materials, Cu, Ni, Co, Zn, Pt, Pd, based catalysts have been successfully synthesized using CACS, SCS, and a combination of both. ,,,,− These materials were found to be very active for ethanol dehydrogenation reaction and fuel cell applications such as oxygen reduction and oxygen evolution. ,,,− This section summarizes the results associated with effect of synthesis parameters on the product physiochemical properties. Figure shows the effect of fuel content on the nanoparticles size and total BET area of CuNi based catalysts synthesized using the SCS and CACS methods.…”

Section: Review Of Experimental Studiesmentioning

confidence: 99%

Current Trends in Cellulose Assisted Combustion Synthesis of Catalytically Active Nanoparticles

Kumar

2019

Ind. Eng. Chem. Res.

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Cellulose assisted combustion synthesis (CACS) has emerged as a novel variation of traditional solution combustion synthesis (SCS) over the past decade for the synthesis of catalytically active nanomaterials. This report targets to summarize the fundamental developments in the synthesis technique seeking correlations between synthesis conditions, observed chemo-physical properties. Molecular level interactions among the metal precursors and reducing agents that lead to combustion reaction and thermal wave propagation in CACS are expected to be different from the SCS method due presence of cellulose fibrils affecting the thermo-physical properties and energy density of the system. In addition, the void spaces and pores may generate a complex network of micro and nanoreactors as opposed to a continuous volume of reacting species in SCS. The goal of this report is to gather the essential developments so far and provide an outlook for future directions.

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“…To further boost the charge transport through the cell, an electrocatalyst with high electrical conductivity and corrosion resistance properties under an intense electrochemical environment is required [7]. These characteristics are necessary for catalysts to have any industrial relevance, particularly the long-term stability and abundance of material to scale up the overall processes to the industrial level [8][9][10]. Several possible catalysts, such as those that are lanthanum based, cobalt based, platinum based, or silver based, have been employed for these cells.…”

Section: Introductionmentioning

confidence: 99%

Highly Active Lanthanum Perovskite Electrocatalysts (LaMnxCo1-xO3 (0 ≤ x ≤ 1)) by Tuning the Mn:Co Ratio for ORR and MOR in Alkaline Medium

et al. 2022

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Lanthanum-based perovskites (LaMnxCo1-xO3 (0 ≤ x ≤ 1)) were synthesized using a solution combustion synthesis technique with variable ratios of Co and Mn to investigate the surface property and electrocatalytic characteristics (stability and activity of catalyst) for methanol oxidation reaction (MOR), oxygen reduction reaction (ORR), and oxygen evolution reaction (OER) under alkaline medium (KOH). The structural, chemical, and morphological characterizations of the synthesized catalyst were performed by XRD, FTIR, SEM, TEM, and XPS techniques as a function of the Mn:Co elemental ratio. The time–temperature profile during the combustion process was also monitored to study the completion of the combustion reaction and to understand its impact on the structure of the perovskites. SEM/EDX and XPS analysis confirmed the formation of the targeted ratio of Mn and Co on the catalyst. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) results revealed that all perovskite samples with different Co:Mn ratios were active for ORR, OER, and MOR. The LaMnxCo1-xO3 perovskite with x = 0.4 showed the highest current density compared to the other samples toward all the electrocatalytic reactions under alkaline reaction conditions. Graphical Abstract

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Combustion synthesis: a novel method of catalyst preparation

Cited by 14 publications

References 0 publications

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

Influence of the Fuel/Oxidant Ratio on the Elaboration of Binary Oxide Catalyst by a Microwave-Assisted Solution Combustion Method

Current Trends in Cellulose Assisted Combustion Synthesis of Catalytically Active Nanoparticles

Highly Active Lanthanum Perovskite Electrocatalysts (LaMnxCo1-xO3 (0 ≤ x ≤ 1)) by Tuning the Mn:Co Ratio for ORR and MOR in Alkaline Medium

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