Alcohol reforming on cobalt-based catalysts prepared from organic salt precursors

Papadopoulou, E.; Delimaris, D.; Denis, A.; Machocki, Andrzej; Ioannides, Theophilos

doi:10.1016/j.ijhydene.2012.02.180

Cited by 13 publications

(13 citation statements)

References 17 publications

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“…The "carboxylate" term includes several organic species that contain at least one carboxyl group, such as oxalate, citrate, etc. Methods for synthesis of cobalt-carboxylates include (i) sol-gel [2,4], (ii) intimate mixing of cobalt ions [6][7][8], (iii) precipitation [9,10], (iv) hot oxidation-redox reaction [11], (v) ball milling [12] and (vi) microemulsion [13]. Reaction of cobalt acetate with a carboxylic acid, for example, leads directly to the synthesis of cobalt-carboxylate, when the carboxylic acid in question is stronger than acetic acid: Co(Ac) 2 + RCOOH → Co(RCOO) 2 + 2 AcH (1).…”

Section: Cobalt and Cobalt Oxide Nanoparticles From Carboxylatesmentioning

confidence: 99%

“…Mixed cobalt-manganese oxides were investigated by Papadopoulou et al [6][7][8]. They employed in-situ XRD to identify the evolving crystalline phases at various stages of pyrolysis of cobalt-manganese gluconate or fumarate precursors and concluded the formation of MnO and metallic Co phases at 550°C due to the thermal decomposition of the fumarate precursor, whereas the decomposition of gluconate precursor above 200°C did not lead to the formation of crystalline phases before 650°C.…”

Section: Structure and Characterization Of Metallic Co Nanoparticlesmentioning

confidence: 99%

“…Thus, reforming of both alcohols took place under comparable conditions at temperatures in the range of 400-450°C. The advantages of the proposed method of catalyst preparation were the formation of the reduced active state of the catalysts in a single step and the existence of residual carbon, which hindered sintering and excessive particle growth under synthesis and reaction conditions [6][7][8] polyhedral architectures and showed that they exhibited high discharge capacities for many discharge/charge cycles, due to their porous structure [18]. Yuan et al synthesized nanosized Co 3 O 4 and concluded that the advantage of this material over carbon was due to its higher capacity per unit volume (7.5 times in comparison to carbon) and that the particle size affected its electrochemical properties (the optimum average particle size was 37 nm) [19].…”

Section: Applications Of Cobalt-based Nanoparticlesmentioning

confidence: 99%

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Synthesis of Cobalt-Based Nanomaterials from Organic Precursors

Smyrnioti¹,

Ioannides²

2017

Cobalt

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Development of efficient and low-cost methods for the production of cobalt and cobalt oxide nanoparticles is of great interest. Such nanoparticles are typically prepared via transformation of precursors under controlled conditions. In the case of organic precursors, the production of said nanoparticles takes place through thermal decomposition of the organic moiety. The decomposition pathway of the precursor is greatly dependent on the type (i.e. inert, reducing or oxidizing) of the gaseous atmosphere prevailing during heating, as well as on the heating schedule itself. The characteristics of the organic group have also an important influence on the structure of the final material. The goal of the current work is to present a comprehensive review of the research work focusing on the synthesis of cobalt-based nanomaterials from activation of organic precursors.

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Section: Cobalt and Cobalt Oxide Nanoparticles From Carboxylatesmentioning

confidence: 99%

Section: Structure and Characterization Of Metallic Co Nanoparticlesmentioning

confidence: 99%

Section: Applications Of Cobalt-based Nanoparticlesmentioning

confidence: 99%

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Synthesis of Cobalt-Based Nanomaterials from Organic Precursors

Smyrnioti¹,

Ioannides²

2017

Cobalt

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“…The main reaction mechanism comprises dehydrogenation or dehydration routes, which implies the formation of intermediates, like acetylene or ethylene, respectively. Coke formation reactions also participate in the reaction pathway leading to catalyst deactivation [8][9][10]. Ethanol steam reforming has been investigated using different catalysts [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ce and Zr Addition to Ni/SiO2 Catalysts for Hydrogen Production through Ethanol Steam Reforming

et al. 2015

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A series of Ni/Ce x Zr 1−x O 2 /SiO 2 catalysts with different Zr/Ce mass ratios were prepared by incipient wetness impregnation. Ni/SiO 2 , Ni/CeO 2 and Ni/ZrO 2 were also prepared as reference materials to compare. Catalysts' performances were tested in ethanol steam reforming for hydrogen production and characterized by XRD, H 2 -temperature programmed reduction (TPR), NH 3 -temperature programmed desorption (TPD), TEM, ICP-AES and N 2 -sorption measurements. The Ni/SiO 2 catalyst led to a higher hydrogen selectivity than Ni/CeO 2 and Ni/ZrO 2 , but it could not maintain complete ethanol conversion due to deactivation. The incorporation of Ce or Zr prior to Ni on the silica support resulted in catalysts with better performance for steam reforming, keeping complete ethanol conversion over time. When both Zr and Ce were incorporated into the catalyst, Ce x Zr 1−x O 2 solid solution was formed, as confirmed by XRD analyses. TPR results revealed stronger Ni-support interaction in the Ce x Zr 1−x O 2 -modified catalysts than in Ni/SiO 2 one, which can be attributed to an increase of the dispersion of Ni species. All of the Ni/Ce x Zr 1−x O 2 /SiO 2 catalysts exhibited good catalytic activity and stability after 8 h of time on stream at 600• C . The best catalytic performance in terms of hydrogen selectivity was achieved when the Zr/Ce mass ratio was three.

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“…Combination of in-situ XRD, H 2 -TPR and methanol-TPR has shown that catalysts produced by pyrolysis are almost fully reduced [1]. Thus, catalysts derived from pyrolysis do not need prereduction and are more active than those with an initial spinel structure in the reaction of steam reforming of ethanol or methanol [2]. State-of-the-art catalysts for steam reforming of methanol are copper-based and operate at 250-300˝C, while ethanol reforming requires higher temperatures of the order of 600˝C [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Methanol Reforming over Cobalt Catalysts Prepared from Fumarate Precursors: TPD Investigation

Papadopoulou¹,

Ioannides²

2016

Catalysts

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Temperature-programmed desorption (TPD) was employed to investigate adsorption characteristics of CH 3 OH, H 2 O, H 2 , CO 2 and CO on cobalt-manganese oxide catalysts prepared through mixed Co-Mn fumarate precursors either by pyrolysis or oxidation and oxidation/reduction pretreatment. Pyrolysis temperature and Co/Mn ratio were the variable synthesis parameters. Adsorption of methanol, water and CO 2 was carried out at room temperature. Adsorption of H 2 and H 2 O was carried out at 25 and 300˝C. Adsorption of CO was carried out at 25 and 150˝C. The goal of the work was to gain insight on the observed differences in the performance of the aforementioned catalysts in methanol steam reforming. TPD results indicated that activity differences are mostly related to variation in the number density of active sites, which are able to adsorb and decompose methanol.

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Alcohol reforming on cobalt-based catalysts prepared from organic salt precursors

Cited by 13 publications

References 17 publications

Synthesis of Cobalt-Based Nanomaterials from Organic Precursors

Synthesis of Cobalt-Based Nanomaterials from Organic Precursors

Effect of Ce and Zr Addition to Ni/SiO2 Catalysts for Hydrogen Production through Ethanol Steam Reforming

Methanol Reforming over Cobalt Catalysts Prepared from Fumarate Precursors: TPD Investigation

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