Fundamentals, properties and applications of solid catalysts prepared by solution combustion synthesis (SCS)

González-Cortés, Sergio; Imbert, Freddy

doi:10.1016/j.apcata.2012.11.024

Cited by 208 publications

(146 citation statements)

References 113 publications

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“…The performance of the La-Ni/γ-Al2O3 catalyst prepared via SCS is postulated to derive from a combination of the SMSI-like effect and the physical-chemical promotional impact of La itself. According to the former, the formation of LaOx decorations provided the catalytic system with La-O-Ni at the interface with the metallic Ni crystallites, which have been proposed to be highly active for the Sabatier reaction [40]. On the other hand, the promoting effects of La would be responsible for quicker/improved CO2 dissociative adsorption due to its higher basicity [17,[41][42][43] and better dispersion/stabilisation of the active Ni phase during preparation and reaction [27,44,45].…”

Section: Catalyst Performancementioning

confidence: 99%

“…The spectrum displays multiple bands between 1050 and 3010 cm −1 . The different species found at the surface of the catalyst during reaction include: La2O2CO3 (1050 cm −1 ) [46], unidentate formates on the Ni surface (1305 and 1607 cm −1 ) [47], formates on the La2O3 surface (1350 and 1500 cm −1 ) [40], bidentate formates on the γ-Al2O3 support (1375, 1395, 1590, and 3010 cm −1 ) [47], adsorbed CO on Ni in bridge configuration (1860 and 1910 cm −1 ) [47,48], adsorbed CO on Ni in linear configuration (2030 cm −1 ) [47,48], and adsorbed/gaseous CO2 (2320 and 2360 cm −1 ). Conversion of CO2 into CH4 during reaction was corroborated by the presence of the characteristic multi-peak bands observed at ca.…”

Section: Reaction Routesmentioning

confidence: 99%

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An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas

et al. 2016

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LaNi 5 , known for its hydrogen storage capability, was adapted to the form of a metal oxide-supported (γ-Al 2 O 3 ) catalyst and its performance for the Sabatier reaction assessed. The 20 wt % La-Ni/γ-Al 2 O 3 particles were prepared via solution combustion synthesis (SCS) and exhibited good catalytic activity, achieving a CO 2 conversion of 75% with a high CH 4 selectivity (98%) at 1 atm and 300 • C. Characteristics of the La-Ni/γ-Al 2 O 3 catalyst were identified at various stages of the catalytic process (as-prepared, activated, and post-reaction) and in-situ DRIFTS was used to probe the reaction mechanism. The as-prepared catalyst contained amorphous surface La-Ni spinels with particle sizes <6 nm. The reduction process altered the catalyst make-up where, despite the reducing conditions, Ni 2+ -based particles with diameters between 4 and 20 nm decorated with LaO x moieties were produced. However, the post-reaction catalyst had particle sizes of 4-9 nm and comprised metallic Ni, with the LaO x decoration reverting to a form akin to the as-prepared catalyst. DRIFTS analysis indicated that formates and adsorbed CO species were present on the catalyst surface during the reaction, implying the reaction proceeded via a H 2 -assisted and sequential CO 2 dissociation to C and O. These were then rapidly hydrogenated into CH 4 and H 2 O.

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Section: Catalyst Performancementioning

confidence: 99%

Section: Reaction Routesmentioning

confidence: 99%

An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas

et al. 2016

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“…In this technique, the liquid solution of a metal salt with a solvent as a fuel is heated until combustion occurs. Additionally, it is pertinent to remark that the SHS method differs substantially from the SCS method including the use of an ignition mechanism which heats locally the sample instead of heating the sample uniformly until volumetric combustion occurs [32].…”

Section: Introductionmentioning

confidence: 99%

Self-propagating high-temperature synthesis of LaMO3 perovskite-type oxide using heteronuclearcyano metal complex precursors

Sánchez-Rodríguez

Wada

Yamaguchi

et al. 2015

Journal of Alloys and Compounds

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The decomposition of La[Fe(CN) 6 ] and La [Co(CN) 6 ] under different atmospheres has been analyzed by thermogravimetry (TG) and differential thermal analysis (DTA). In addition, the decomposition temperature at different sample locations was monitored for sample masses around 2 g of La[Fe(CN) 6 ] and La[Co(CN) 6 ], when they were calcined for 1 h at temperatures ranging from 200 to 400 ºC in a controlled gas-flow system.Results showed that, for sample large enough of these cyano complex precursors undergo combustion when are decomposed under oxygen atmosphere. X-ray diffraction 2 revealed that perovskite-type oxides crystallize due to the overheating of the process. As a result, it has been possible to produce LaFeO 3 and LaCoO 3 perovskite-type oxide powders by SHS under oxygen atmosphere using La[Fe(CN) 6 ] and La[Co(CN) 6 ] as a precursor. The effect of the ignition temperature has been investigated. The specific surface area of the perovskite-type oxides produced via SHS using heteronuclearcyano metal complex as a precursor is significantly higher than that of other LaMO 3 produced using the same technique but obtained from other type of precursors.

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“…The solid oxide material obtained is generally nanocrystalline, making it highly attractive for heterogeneous catalysis, in particular for applications requiring a highly stable catalyst. [11][12][13][14][15][16][17][18] In this paper, we run CO oxidation cycles on pristine ceria, Rh-ceria, and Pt-ceria powders prepared by SCS. CO oxidation is the archetypal reaction to test the catalytic performance of metal-oxide materials.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of CO oxidation toward metal oxidation state in ceria-supported catalysts: an operando DRIFTS-MS study

Kaftan

Kollhoff

Nguyen

et al. 2016

Catal. Sci. Technol.

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The oxidation of carbon monoxide has been studied on pristine CeO 2 , Rh-CeO 2 , and Pt-CeO 2 powders prepared in one step by solution combustion synthesis (SCS). The reaction was cycled between an oxygenrich and a CO-rich feed with regard to the stoichiometric conditions. CO 2 production was monitored by mass spectrometry, while the surface species were probed by operando DRIFTS (Diffuse Reflectance Infrared Fourier Transform Spectroscopy). Whereas the reaction starts above 150°C on CeO 2 and Rh-CeO 2 and does not depend on the state of the surface (oxidized or reduced), the reaction on Pt-CeO 2 shows strong dependency on the initial state and substantial activity is achieved at much lower temperatures with the CO-rich feed. We relate this result to the change in the oxidation state of Pt via strong interaction with ceria.

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Fundamentals, properties and applications of solid catalysts prepared by solution combustion synthesis (SCS)

Cited by 208 publications

References 113 publications

An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas

An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas

Self-propagating high-temperature synthesis of LaMO3 perovskite-type oxide using heteronuclearcyano metal complex precursors

Sensitivity of CO oxidation toward metal oxidation state in ceria-supported catalysts: an operando DRIFTS-MS study

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