Preparation of stabilized copper-rare earth oxide catalysts for the synthesis of methanol from syngas

Andriamasinoro, D.; Kieffer, R.; Kiennemann, A.; Poix, P.

doi:10.1016/0926-860x(93)80178-s

Cited by 53 publications

(20 citation statements)

References 11 publications

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“…Also, their promising use in materials science, biotechnology, environmental science and electronic industry is well-appreciated. [1][2][3][4][5][6] Certainly, CeO 2 , a promising rare-earth oxide, has been rapidly emerging as a new appealing material owing to its unique structural, redox and acid-base properties. [7][8][9] These eminent features make ceria effective in industrial catalysis (e.g., automotive catalytic converters) to decrease harmful pollutants from combustion exhausts.…”

Section: Introductionmentioning

confidence: 99%

Preparation of silica supported ceria–lanthana solid solutions useful for synthesis of 4-methylpent-1-ene and dehydroacetic acid

Katta

Sudarsanam

Mallesham

et al. 2012

Catal. Sci. Technol.

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The intriguing research toward the exploitation of ceria-based materials for various applications has been growing significantly. In the present investigation, we describe the preparation, characterization and utilization of CeO 2 -La 2 O 3 (CL) and CeO 2 -La 2 O 3 /SiO 2 (CLS) solid solutions for the synthesis of two industrially useful chemicals namely 4-methylpent-1-ene and dehydroacetic acid. Coprecipitation and deposition coprecipitation from ultrahigh dilute solutions were used for the synthesis of CL and CLS catalysts, respectively. The physicochemical characterization has been achieved with the help of various techniques namely X-ray diffraction (XRD), BET surface area, transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), Raman spectroscopy (UV-RS and Vis-RS), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD) measurements. The structure-activity relationships helped to correlate different parameters that are necessary for obtaining desired products in good yields. The inclusion of silica support has an optimistic influence on the acid-base properties of the ceria-lanthana, in terms of both amount and strength of sites. The presence of silica not only manipulates the acid-base properties but also causes numerous benefits, for instance, it improves the dispersion, stabilizes the active component against sintering and enriches the oxygen vacancy concentration. The meticulous analysis of characterization and activity studies revealed the significant role of acid-base sites in directing the desired products. Interestingly, the CLS catalyst has shown better performance in the production of both 4-methylpent-1-ene and dehydroacetic acid compared to the unsupported CL sample due to well-balanced acid-base sites.

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Section: Introductionmentioning

confidence: 99%

Preparation of silica supported ceria–lanthana solid solutions useful for synthesis of 4-methylpent-1-ene and dehydroacetic acid

Katta

Sudarsanam

Mallesham

et al. 2012

Catal. Sci. Technol.

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“…The metal nitrates form an important class of compounds in the chemical industry as they are widely used as precursors in the production of metal oxides for high surface catalysts, molecular sieves, ceramics, adsorbents and electronic materials [1][2][3], as well as they have interest for ecological and environmental reasons [4]. Several works [5][6][7][8][9] have been published dealing with the influence of gamma irradiation on the thermal decomposition of inorganic oxyanion compounds.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of kinetic parameters for the thermal decomposition of gamma-irradiated anhydrous lanthanum nitrate

James

Samuel²

2008

Radiation Effects and Defects in Solids

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The thermal decomposition of gamma-irradiated anhydrous lanthanum nitrate was studied by dynamic thermogravimetry. The decomposition proceeds via three consecutive stages characterized by different activation energies. The reaction order, activation energy, frequency factor and entropy of activation were calculated using the Coats-Redfern, Freeman-Carroll and Horowitz-Metzger methods and were compared with those of the unirradiated salt. Irradiation enhances the decomposition and the effect increases with the irradiation dose. The activation energies of all the three stages decrease on irradiation. The mechanism of the decomposition of unirradiated and irradiated anhydrous lanthanum nitrate follows the Mampel model equation, − ln(1 − α) for g(α), and the rate-controlling process is random nucleation with the formation of a nucleus on every particle.

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“…The hydroxycarbonates had been viewed as an undesirable component in lanthanum oxide catalysts as they could deactivate the catalysts. Therefore, much efforts have been made in trying to remove or avoid the hydroxycarbonate [1,2]. But as early as 1978, the solids were studied as a type of useful inorganic materials, for instance, cerous hydroxycarbonate was proposed as a potential hydrogen producing species in the closed thermochemical cycles for water-splitting [3].…”

Section: Introductionmentioning

confidence: 99%

Crystalline lanthanum hydroxycarbonates with controlled phases and varied morphologies prepared on non-crystalline substrates

Han

Yang

2004

Journal of Solid State Chemistry

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Preparation of stabilized copper-rare earth oxide catalysts for the synthesis of methanol from syngas

Cited by 53 publications

References 11 publications

Preparation of silica supported ceria–lanthana solid solutions useful for synthesis of 4-methylpent-1-ene and dehydroacetic acid

Preparation of silica supported ceria–lanthana solid solutions useful for synthesis of 4-methylpent-1-ene and dehydroacetic acid

Evaluation of kinetic parameters for the thermal decomposition of gamma-irradiated anhydrous lanthanum nitrate

Crystalline lanthanum hydroxycarbonates with controlled phases and varied morphologies prepared on non-crystalline substrates

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