Solution Combustion Synthesis of Cr2O3 Nanoparticles and the Catalytic Performance for Dehydrofluorination of 1,1,1,3,3-Pentafluoropropane to 1,3,3,3-Tetrafluoropropene

Cr2O3 nanoparticles were prepared by solution combustion synthesis (SCS) with chromium nitrate as the precursor and glycine as the fuel. Commercial Cr2O3 and Cr2O3 prepared by a precipitation method were also included for comparison. The morphology, structure, acidity and particle size of fresh and spent Cr2O3 catalysts were investigated by techniques such as XRD, SEM, TEM, BET and NH3-TPD. In addition, catalytic performance was evaluated for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (CF3CH2CHF2, HFC-245fa) to 1,3,3,3-tetra-fluoropropene (CF3CH=CHF, HFO-1234ze). The catalytic reaction rate of Cr2O3 prepared by SCS method is as high as 6 mmol/h/g, which is about 1.5 times and 2 times higher than that of precipitated Cr2O3 and commercial Cr2O3, respectively. The selectivity to HFO-1234ze for all the catalysts maintains at about 80%. Compared with commercial and precipitated Cr2O3, Cr2O3-SCS prepared by SCS possesses higher specific surface area and acid amount. Furthermore, significant change in the crystal size of Cr2O3 prepared by SCS after reaction was not detected, indicating high resistance to sintering.

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Solution Combustion Synthesis of Fe2O3-Based Catalyst for Ammonia Synthesis

Catalysts ◽

10.3390/catal10091027 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1027

Author(s):

Binxiang Cai ◽

Huazhang Liu ◽

Wenfeng Han

Keyword(s):

Combustion Synthesis ◽

Reaction Rate ◽

Ammonia Synthesis ◽

Fixed Bed ◽

Solution Combustion Synthesis ◽

Fixed Bed Reactor ◽

High Dispersion ◽

Synthesis Reaction ◽

Solution Combustion ◽

Metal Nitrates

Fe2O3-based catalysts were prepared by solution combustion synthesis (SCS) with metal nitrates (Fe, K, Al, Ca) as the precursors and glycine as the fuel. The activities of catalysts were evaluated in terms of ammonia synthesis reaction rate in a fixed bed reactor similar to the industrial reactors. The results indicate that the precursor of catalyst prepared by SCS is Fe2O3 which facilitates the high dispersion of promoters to provide high activity. The catalysts exhibit higher activity for ammonia synthesis than that of traditional catalysts, and the reaction rate reaches 138.5 mmol g−1 h−1. Fe2O3 prepared by SCS could be favorable precursor for ammonia synthesis catalyst. The present study provides a pathway to prepare catalyst for ammonia synthesis.

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Solution Combustion Synthesis of LiMn2O4 with Different Starting Reactant Compositions

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.293 ◽

2008 ◽

Vol 368-372 ◽

pp. 293-295 ◽

Cited By ~ 14

Author(s):

Gui Yang Liu ◽

De Wei Guo ◽

Jun Ming Guo ◽

Li Li Zhang ◽

Ke Xin Chen

Keyword(s):

Combustion Synthesis ◽

Reaction Rate ◽

Single Phase ◽

Fine Particles ◽

Raw Materials ◽

Solution Combustion Synthesis ◽

Spinel Limn2o4 ◽

Solution Combustion ◽

Nitrate Salts ◽

Phase Spinel

Spinel LiMn2O4 powders were prepared by solution combustion synthesis using nitrate and acetate salts as raw materials and urea as fuel. The phase composition of as-synthesized powders was identified by XRD and the microscopic structure was examined by SEM. Single-phase spinel LiMn2O4 was prepared when acetate salts were used, and the incorporation of nitrate salts resulted in the formation of Mn2O3. The products consisted of slight agglomerations of fine particles with the size of 50-200nm. It was found that the addition of nitrate salts increased the reaction rate and the yield of LiMn2O4 was depressed when more nitrate salts were used as a reactant.

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Solution combustion synthesis of Ni/La2O3 for dry reforming of methane: tuning the basicity via alkali and alkaline earth metal oxide promoters

RSC Advances ◽

10.1039/d1ra05511a ◽

2021 ◽

Vol 11 (53) ◽

pp. 33734-33743

Author(s):

Yahia H. Ahmad ◽

Assem T. Mohamed ◽

A. Kumar ◽

Siham Y. Al-Qaradawi

Keyword(s):

Combustion Synthesis ◽

Alkaline Earth ◽

Earth Metal ◽

Solution Combustion Synthesis ◽

Catalytic Performance ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Alkaline Earth Metal ◽

Solution Combustion ◽

Alkaline Earth Metal Oxides

Alkali and alkaline earth metal oxides-promoted Ni/La2O3 catalysts synthesized by solution combustion synthesis revealed enhanced catalytic performance towards dry reforming of methane.

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Unsupported nanostructured Mn oxides obtained by Solution Combustion Synthesis: Textural and surface properties, and catalytic performance in NO x SCR at low temperature

Applied Catalysis A General ◽

10.1016/j.apcata.2016.05.002 ◽

2016 ◽

Vol 522 ◽

pp. 120-129 ◽

Cited By ~ 22

Author(s):

F.A. Deorsola ◽

S. Andreoli ◽

M. Armandi ◽

B. Bonelli ◽

R. Pirone

Keyword(s):

Low Temperature ◽

Combustion Synthesis ◽

Surface Properties ◽

Solution Combustion Synthesis ◽

Catalytic Performance ◽

Solution Combustion ◽

Mn Oxides

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The Effect of the Precursor Solution’s Pretreatment on the Properties and Microstructure of the SCS Final Nanomaterials

Applied Sciences ◽

10.3390/app9061200 ◽

2019 ◽

Vol 9 (6) ◽

pp. 1200 ◽

Cited By ~ 1

Author(s):

Olga Thoda ◽

Galina Xanthopoulou ◽

George Vekinis ◽

Alexander Chroneos

Keyword(s):

Combustion Synthesis ◽

High Speed ◽

Solution Combustion Synthesis ◽

Precursor Solution ◽

Processing Parameters ◽

Catalytic Performance ◽

X Ray Diffraction ◽

Solution Combustion ◽

X Ray ◽

Powder Properties

Nanostructured nickel-based catalysts were produced by solution combustion synthesis and it was found that their properties and structure depended on the pretreatment of the precursor solution. X-ray diffraction, N2 adsorption, and an infrared high-speed camera were used to follow the various synthesis steps and to characterize the obtained catalysts, while their catalytic activity was determined in the hydrogenation of maleic acid. It was determined that the amount of water used and the heating of the precursor solution under mild stirring up to 70 °C influenced the nickel nitrate–glycine–water complexes that were formed in the precursor solution in the form of dendrites. These play a key role in the solution combustion synthesis (SCS) reaction mechanism and in particular in the formation of nickel-based catalysts. Understanding the interrelationships between the processing parameters and the ensuing powder properties allowed an efficient optimization of the catalytic performance.

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Cr2O3/carbon nanosheet composite with enhanced performance for lithium ion batteries

RSC Advances ◽

10.1039/c7ra06188a ◽

2017 ◽

Vol 7 (64) ◽

pp. 40243-40248 ◽

Cited By ~ 4

Author(s):

Zhiqin Cao ◽

Chengyang Zuo

Keyword(s):

Carbon Source ◽

Lithium Ion Batteries ◽

Combustion Synthesis ◽

Anode Materials ◽

Lithium Ion ◽

Solution Combustion Synthesis ◽

Superior Performance ◽

Chromium Nitrate ◽

Solution Combustion

A Cr2O3/carbon nanosheet composite is directly synthesized by solution combustion synthesis using chromium nitrate as the chromium source and glucose as the carbon source. As anode materials for LIBs, the composite shows superior performance than pure Cr2O3.

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Fabrication of Nanoyttria by Method of Solution Combustion Synthesis

Nanomaterials ◽

10.3390/nano10050831 ◽

2020 ◽

Vol 10 (5) ◽

pp. 831

Author(s):

Magdalena Gizowska ◽

Milena Piątek ◽

Krzysztof Perkowski ◽

Gustaw Konopka ◽

Irena Witosławska

Keyword(s):

Particle Size ◽

Combustion Synthesis ◽

Solution Combustion Synthesis ◽

Ceramic Technology ◽

Yttrium Nitrate ◽

Solution Combustion ◽

Ir Spectrometry ◽

Method Of Solution ◽

Ft Ir ◽

Very High

In the work the research on properties of an yttria nanopowder obtained by solution combustion synthesis (SCS) in terms of its application in ceramic technology is presented. In order to characterize the SCS reaction the decomposition of yttrium nitrate, glycine and their solution was investigated using differential thermal analysis coupled with FT-IR spectrometry of the gases emitted during the measurements. The product obtained in the SCS process was characterized in terms of its microstructure, particle size distribution and BET specific surface. Although the obtained powders showed nanoscaled structures, only after calcination at a temperature of 1100 °C nanosized particles were revealed. The calcined powder occurred in an agglomerated state (cumulants mean Zave = 1.3 µm). After milling particle size was successfully decreased to Zave = 0.28 µm. The deagglomerated powder was isostatically densified and tested for sintering ability. The obtained nanopowder showed very high sintering activity as the shrinkage onset was detected already at a temperature of about 1150 °C.

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