Effect of Ru on LaCoO3 perovskite-derived catalyst properties tested in oxidative reforming of diesel

Navarro, R.M.; Álvarez-Galván, M. Consuelo; Villoria, J. A.; Gonzalez-Jimenez, Ines D.; Rosa, Felipe; Fierro, J.L.G.

doi:10.1016/j.apcatb.2006.12.013

Cited by 83 publications

(46 citation statements)

References 44 publications

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“…Reduction profile of LaCoO 3 reveals two hydrogen consumption peaks. The first can be deconvoluted in two components with maxima at 646 and 688 K, assigned, in agreement with literature [2], to the reduction of Co 3? to Co 2?…”

Section: Resultssupporting

confidence: 89%

“…As seen from Table 1, it is observed an increase in the surface area of perovskite precursors with the partial substitution of cobalt by ruthenium or iron in the LaCoO 3 perovskite structure, as result of a decrease in its particle size [2].…”

Section: Resultsmentioning

confidence: 78%

“…Any differentiated peaks associated with the reduction of cobalt oxide species were not revealed. The shift of the first reduction peak to lower temperatures with the addition of Ru may be due to a spill-over process of hydrogen assisted by ruthenium [14], to bimetallic Co-Ru interactions that increase the rate of reduction [15] or almost certainly to changes in the perovskite structure/ cell parameters of LaCoO 3 , leading to structures with lower diffusional resistance to hydrogen reduction [2]. The smaller size of perovskite crystallites in Ru-containing sample not only produces a better diffusion of hydrogen from the external surface of the particles through the inner but also of water produced during reduction from the core to the outer surface, favouring the whole reduction process [16,17].…”

Section: Resultsmentioning

confidence: 99%

“…The main problems are related to the degradation of catalysts over time due to the harsh operating conditions such as high reaction temperature, coke formation and sulphurcontaining compounds. Therefore, the successful extraction of hydrogen from diesel largely depends on the development of new catalysts with high thermal stability and improved properties respect to coke formation and sulphur poisoning [2,3]. In recent years the research on catalysts for reforming of hydrocarbons has paid much attention to systems derived from perovskite structures of general formula ABO 3, where A is a rare earth cation and B is a first-row transition metal (Co, Ni, Fe, Cr or Mn) [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years the research on catalysts for reforming of hydrocarbons has paid much attention to systems derived from perovskite structures of general formula ABO 3, where A is a rare earth cation and B is a first-row transition metal (Co, Ni, Fe, Cr or Mn) [3][4][5][6]. Perovskite structures are a good alternative as catalysts precursors since these oxides form under reforming conditions well dispersed metallic particles on the surface of basic supports, which increase hydrogen formation, prevent deactivation by coke and sulphur [7] and promote the gasification of coke precursors [2,8]. To improve the activity and stability of perovskite derived catalysts, structural and electronic modifications can be introduced in the perovskite structure by partial substitution of A-site or B-site cations with other cations [9,10] resulting in mixed valence states and enhanced mobility of oxygen in the lattice.…”

Section: Introductionmentioning

confidence: 99%

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Reforming of Diesel Fuel for Hydrogen Production over Catalysts Derived from LaCo1−x M x O3 (M = Ru, Fe)

et al. 2009

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Catalysts derived from perovskite type oxides LaCo 1-x M x O 3 (M = Ru or Fe, x = 0.2) synthesized by a modified citrate sol-gel method were tested in the oxidative reforming of diesel for hydrogen production. Physicochemical characterization of the samples revealed differences in the surface area, crystalline size, reducibility and relative distribution of the cobalt active phase on the surface of catalyst. These properties have important implications in the catalytic behaviour of the samples in the oxidative reforming of diesel. The increase in reducibility and metal exposition implies higher reforming activity as it was observed for the catalyst derived from LaCo 0.8 Ru 0.2 O 3 .

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reforming of Diesel Fuel for Hydrogen Production over Catalysts Derived from LaCo1−x M x O3 (M = Ru, Fe)

et al. 2009

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Catalysts for Hydrogen Production from Heavy Hydrocarbons

et al. 2010

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Nearly 2 % of the world's primary energy is stored in the 65 million tonnes of hydrogen generated each year, almost all of which is for captive use in the chemical and refinery industries. [1] Currently, the main processes for producing industrial hydrogen are catalytic steam reforming of natural gas (48 %) and oil-derived naphtha (30 %), coal gasification (18 %), and the electrolysis of water (4 %). [2] Apart from its traditional uses, hydrogen is considered an ideal energy carrier in the future energy systems that need to be economically and environmentally sustainable. [3] The possibility of using hydrogen as an alternative energy carrier has intensified the exploration of hydrogen production processes from a wide range of primary sources such as natural gas, fuels, methanol, biomass, coal, solar, and nuclear power. [4][5][6][7][8] Although hydrogen production, storage, and distribution are commercially viable in the chemical and refining industries, the cost and efficiency of the infrastructures for its storage and distribution for energy use is currently unacceptable compared to existing petroleum distillate facilities. [9] Additionally, current commercial options for H 2 storage (high pressure or liquefaction) do not fully meet requirements for compactness, drive range, and cost in transport applications (2 kWh kg À1 and 4 $ kWh À1 ). To achieve effective hydrogen storage, research activities have focused on the development of in situ production processes based on the reforming of high-density liquids that contain hydrogen, such as methanol, ethanol, or fuels. Several studies [10][11][12][13][14] have analyzed [a] Dr.

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