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Barbero, J. A.

doi:10.1023/a:1023407609626

Cited by 68 publications

(22 citation statements)

References 25 publications

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“…The reduction profile of Ni-La 2 O 3 calcined sample is characterized by two consumption peaks, the first one centered around 330°C and the second one around 580°C, both due to the 2-step reduction of the perovskite LaNiO 3 (see Equations 5, 6), formed during the calcination step (Barbero et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

“…The higher ratios obtained for ceria and lanthana-supported catalyst precursors are characteristic of a highly dispersed nickel phase. The low Ni/Mg ratio is due to the formation of a Ni-Mg-O solid solution (Arena et al, 1996; Barbero et al, 2003). The C 1s core-level spectrum of the lanthana-supported catalyst precursor shows a component around 289–290 eV due to the presence of carbonates, which is in accordance with the strong basic character of this oxide.…”

Section: Resultsmentioning

confidence: 99%

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Partial Oxidation of Methane to Syngas Over Nickel-Based Catalysts: Influence of Support Type, Addition of Rhodium, and Preparation Method

et al. 2019

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There is great economic incentive in developing efficient catalysts to produce hydrogen or syngas by catalytic partial oxidation of methane (CPOM) since this is a much less energy-intensive reaction than the highly endothermic methane steam reforming reaction, which is the prominent reaction in industry. Herein, we report the catalytic behavior of nickel-based catalysts supported on different oxide substrates (Al2O3, CeO2, La2O3, MgO, and ZrO2) synthesized via wet impregnation and solid-state reaction. Furthermore, the impact of Rh doping was investigated. The catalysts have been characterized by X-ray diffraction, N2 adsorptiondesorption at −196°C, temperature-programmed reduction, X-ray photoelectron spectroscopy, O2-pulse chemisorption, transmission electron microscopy, and Raman spectroscopy. Supported Ni catalysts were found to be active for CPOM but can suffer from fast deactivation caused by the formation of carbon deposits as well as via the sintering of Ni nanoparticles (NPs). It has been found that the presence of Rh favors nickel reduction, which leads to an increase in the methane conversion and yield. For both synthesis methods, the catalysts supported on alumina and ceria show the best performance. This could be explained by the higher surface area of the Ni NPs on the alumina surface and presence of oxygen vacancies in the CeO2 lattice, which favor the proportion of oxygen adsorbed on defect sites. The catalysts supported on MgO suffer quick deactivation due to formation of a NiO/MgO solid solution, which is not reducible under the reaction conditions. The low level of carbon formation over the catalysts supported on La2O3 is ascribed to the very high dispersion of the nickel NPs and to the formation of lanthanum oxycarbonate, through which carbon deposits are gasified. The catalytic behavior for catalysts with ZrO2 as support depends on the synthesis method; however, in both cases, the catalysts undergo deactivation by carbon deposits.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Partial Oxidation of Methane to Syngas Over Nickel-Based Catalysts: Influence of Support Type, Addition of Rhodium, and Preparation Method

et al. 2019

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“…In the following decades, the Devotos invested in financial ventures, farming, manufacturing, extractive activities and electricity, pursuing a diversification strategy based on integration and synergies among financial and non-financial investments. 25 A key venture was Compañía General de Fósforos, a match manufacturing outfit that grew and increasingly integrated and diversified starting in the early twentieth century, and expanded into the chemical, textile, paper and publishing businesses. 26 The group's bank and insurance company provided services to its other ventures, further demonstrating the synergistic benefits to diversification.…”

Section: Business Groups In Argentina Duringmentioning

confidence: 99%

“…Intertwining stockholders and board members was a common practice in this group, as it was with the other two groups. 30 Fifth, all business groups built and managed companies that largely proved competitive in their respective industries. The information available on the firms controlled by these groups revealed that they made significant investments in technology and management.…”

Section: Business Groups In Argentina Duringmentioning

confidence: 99%

“…To accomplish the former, the group invested heavily and constantly in production, distribution, and management, updating its equipment, developing new products, making sizable investments in research and development, and partnering with universities and MNEs for some projects. 87 It also built a distribution network that gradually broadened its coverage to include other Argentine regions, while also streamlining its organizational structure and management.…”

Section: B Newcomersmentioning

confidence: 99%

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Business groups in nineteenth and twentieth century Argentina

Barbero¹

2015

The Impact of Globalization on Argentina and Chile

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Low Temperature Partial Oxidation of Methane over Bimetallic Nickel‐f Block Element Oxide Nanocatalysts

et al. 2014

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The partial oxidation of methane (POM) was studied over bimetallic nickel-f block element oxide nanocatalysts prepared by a modified sol-gel method. They proved to be active (conversion of methane, 50-70%) at a relatively low temperatures (550 and 650 8C) and highly selective towards synthesis gas production (selectivity, H 2 60-90% and CO 50-80%). The activity and selectivity depend on the surface basicity and size of the bimetallic oxide nanoparticles: lower particle size and higher basicity, enhanced activity and selectivity to synthesis gas. Catalysts reducibility seems as well to promote their activity and selectivity. The bimetallic nickel-gadolinium and nickel-thorium oxide nanocatalysts proved to be more active and selective towards synthesis gas production than a commercial platinum supported catalyst (5 wt% Pt/Al 2 O 3 ) or other bimetallic nickel oxide catalysts obtained by a different high temperature preparation route, which stresses the advantage of the preparation method. The bimetallic nickel-f block element oxide nanocatalysts present also remarkable long-term stability and an unusual low deposition of carbon, which is a major advantage, especially when compared to other nickel-based catalysts reported for POM. Such a behavior was attributed to the lanthanide or actinide oxide phases that appear to play an important role on the catalysts stability. A number of Ni-based catalysts, for example, NiO-MgO, [7] NiO-CaO, [8] NiO-lanthanide oxides [9] or nickel-lanthanum-based catalysts, [10] NiO/ Al 2 O 3 [11] and nickel actinides [12] showed to be as attractive as the noble metal catalysts due to their lower cost and higher activity and selectivity. However, Ni-based catalysts suffer deactivation due to low metal sintering and carbon deposition (coke formation through Boudouard reaction), as its major problem. [5c,13]

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Untitled

Cited by 68 publications

References 25 publications

Partial Oxidation of Methane to Syngas Over Nickel-Based Catalysts: Influence of Support Type, Addition of Rhodium, and Preparation Method

Partial Oxidation of Methane to Syngas Over Nickel-Based Catalysts: Influence of Support Type, Addition of Rhodium, and Preparation Method

Business groups in nineteenth and twentieth century Argentina

Low Temperature Partial Oxidation of Methane over Bimetallic Nickel‐f Block Element Oxide Nanocatalysts

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