Journal ArticleDOI
Dehydrogenation of ethylbenzene with CO2 to produce styrene over Fe-containing ceramic composites
Jesuína Cássia Santiago de Araújo,Charllys B.A. Sousa,Alcemira C. Oliveira,Francisco Nivaldo Aguiar Freire,Alejandro Ayala,Alcineia C. Oliveira +5 more
TLDR
In this paper, the activity of Fe-containing ceramic composites for the dehydrogenation of ethylbenzene in the presence of CO 2 was studied, and a low conversion was obtained using CaTiO 3, due to the loss of the Ca species and coke production.Abstract:
The activity of Fe-containing ceramic composites for the dehydrogenation of ethylbenzene in the presence of CO 2 was studied. Ceramic composites containing Fe, Cu, Cr, Pb and/or Ti were obtained by solid-state reaction method. The materials were characterized by XRD, textural properties, chemical analysis, SEM, Mossbauer spectroscopy, TPR, CO 2 -TPD analyses and electrical measurements. A low conversion was obtained using CaTiO 3 , due to the loss of the Ca species and coke production. The improvement of styrene selectivity with iron content, as well as the high stability of Cr 0.75 Fe 1.25 O 3 , resulted in a better activity when using this solid. Fe 2+ is continuously reoxidized to Fe 3+ by CO 2 in the Fe–Ti active phase from the Fe 0.5 Cu 0.75 Ti 0.75 O 3 sample. The latter catalyst exhibited high selectivity but limited stability towards styrene production. The ceramic composites appeared to be quite promising candidates for the dehydrogenation of ethylbenzene under CO 2 , in comparison with the conventional Fe–K doped catalysts, due to the highly stable Fe 3+ in a ceramic matrix.read more
Citations
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Journal ArticleDOI
Mesoporous MAl2O4 (M = Cu, Ni, Fe or Mg) spinels: Characterisation and application in the catalytic dehydrogenation of ethylbenzene in the presence of CO2
Andressa Hellen de Morais Batista,Francisca S.O. Ramos,Tiago Pinheiro Braga,Cleanio L. Lima,Francisco F. de Sousa,Eduardo B. Barros,Josué Mendes Filho,Aldenor S. de Oliveira,Jackson R. de Sousa,Antoninho Valentini,Alcineia C. Oliveira +10 more
TL;DR: In this article, the catalytic properties of nanostructured MAl 2 O 4 (MAl, Ni, Fe or Mg) were investigated in the dehydrogenation of ethylbenzene with CO 2.
Journal ArticleDOI
Conversion of glycerol into lactic acid using Pd or Pt supported on carbon as catalyst
Mª Rosiene A. Arcanjo,Ivanildo J. Silva,Enrique Rodríguez-Castellón,Antonia Infantes-Molina,Rodrigo Silveira Vieira +4 more
TL;DR: In this article, the textural and structural properties of the carbon supported catalysts were evaluated by N 2 adsorption-desorption isotherms at −196°C, XRD, SEM, EDX, TEM and XPS.
Journal ArticleDOI
CO2 as an Oxidant for High-Temperature Reactions
Abstract: This paper presents a review on the developments in catalyst technology for the reactions utilizing CO2 for high temperature applications. These include dehydrogenation of alkanes to olefins, the dehydrogenation of ethylbenzene to styrene and finally CO2 reforming of hydrocarbon feedstock (i.e. methane) and alcohols. Aspects on the various reaction pathways are also highlighted. The literature on the role of promoters and catalyst development is critically evaluated. Most of the reactions discussed in this review are exploited in industries and related to on-going processes, thus providing extensive data from literature. However some reactions, such as CO2 reforming of ethanol and glycerol which have not reached industrial scale are also reviewed owing to their great potential in terms of sustainability which are essential as energy for the future. This review further illustrates the building-up of knowledge which shows the role of support and catalysts for each reaction and the underlying linkage between certain catalysts which can be adapted for the multiple CO2-related reactions.
Journal ArticleDOI
Oxidative dehydrogenation of ethylbenzene with CO2 for styrene production over porous iron-based catalysts
Antônio Joel Ramiro de Castro,João Maria Soares,Josué Mendes Filho,Alcineia C. Oliveira,Adriana Campos,Édwin R.C. Milet +5 more
TL;DR: In this paper, the reactivity of iron-based catalysts toward styrene production was dependent on the structural and textural features of the solid as well as the nature of the promoter, showing that FeTi performed much better in terms of stability showing no tendency to sintering or phase transformation whereas the other solids suffered from hard carbon deposition.
Journal ArticleDOI
Activity studies of vanadium, iron, carbon and mixed oxides based catalysts for the oxidative dehydrogenation of ethylbenzene to styrene: a review
TL;DR: A review of vanadium, iron, carbon and mixed-oxide based catalysts for the dehydrogenation of ethylbenzene to yield styrene is presented in this article.
References
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Journal ArticleDOI
Iron Oxide Catalysts for Dehydrogenation of Ethylbenzene in the Presence of Steam
TL;DR: In this paper, the historical evolution of EB dehydrogenation processes has been summarized by Kearby [21 and others [3] and a detailed overview of EB catalysts can be found in Table 1.
Journal Article
Stabilization of the perovskite phase and dielectric properties of ceramics in the Pb(Zn1/3Nb2/3)O3-BaTiO3 system
TL;DR: In this paper, the BaTiO 3 was added to BaTiVo 3, which permet d'eviter la formation de phase pyrochlore dans les ceramiques de PZN.
Journal ArticleDOI
Carbon deposition and catalyst stability over La2NiO4/γ-Al2O3 during CO2 reforming of methane to syngas
Bingsi Liu,Chak Tong Au +1 more
TL;DR: In this paper, the use of 9% La2NiO4/γ-Al2O3 (9NLA) as a catalyst for CO2 reforming of methane to syngas has been investigated in a fixed-bed reactor.
Journal ArticleDOI
Behavior of active sites on Cr-MCM-41 catalysts during the dehydrogenation of propane with CO2
Katsuomi Takehira,Yoshihiko Ohishi,Tetsuya Shishido,Tomonori Kawabata,Ken Takaki,Qinghong Zhang,Ye Wang +6 more
TL;DR: In this paper, the mechanism of catalyst deactivation and regeneration was discussed based on the structure-catalytic property relationships. And the authors concluded that during the reaction propane is dehydrogenated to propene by Cr(IV)O4 tetrahedra, which is simultaneously reduced to Cr(III)O6 octahedra.
Journal Article
A review of Mössbauer data on inorganic glasses: the effects of composition on iron valency and coordination
TL;DR: In this paper, the verres contenant du fer, which couvre les recherches geologiques et ceramiques sur les systemes contenants du fer Na−Si−O, borate, phosphate and silicates complexes, are discussed.