Synthesis and characterization of polymeric activated carbon-supported vanadium and magnesium catalysts for ethylbenzene dehydrogenation

Deshidrogenación catalítica del etilbenceno a estireno

“…Hoy en día es una de las técnicas de caracterización más utilizadas para los catalizadores heterogéneos, ya que permite la determinación de las fases cristalinas presentes en los sólidos lo cual es determinante para establecer la presencia de fases activas a las reacciones. En la mayoría de las investigaciones tendientes a la reacción de deshidrogenación del etilbenceno se ha usado como técnica fundamental de caracterización y ello lo podemos observar en los trabajos de catálisis con óxidos metálicos soportados en materiales tradicionales (Ikenaga, 2000;Conceicao y Rangel, 2003;Moronta, 2006;Bothelo, 2008;Dias, 2008;Shuwei, 2009;Saito, 2010;Kotarba, 2011, ), óxidos metálicos soportados en materiales novedosos (Bispo, 2002;Ponomoreva, 2004;Zhao, 2006;Feng, 2007;Liu, 2008;Qioa, 2009;Pinhero, 2009;Araujo, 2010;Batista, 2010;Lima, 2011;Khatamian, 2011), sustitución metálica , estudios de acidez superficial (Ferretto, 2002), efecto promotor (Vislovsky, 2002;Park, 2003;Dulamita, 2005;Nogueira, 2011;), efectos polimetálicos (Carja, 2003Liao, 2008;Li, 2009;Balasamy, 2010;Ji, 2010;), catalizadores a base de hidrotalcitas (Ye, 2004;Ohishi, 2005;, fenómenos de desactivación catalítica (Rossetti, 2005;Freire, 2009) e influencia del método de síntesis (Santos, 2006), entre otros.…”

Activity studies of vanadium, iron, carbon and mixed oxides based catalysts for the oxidative dehydrogenation of ethylbenzene to styrene: a review

“…[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] On the other hand, the reaction over transition metals as well as metal oxide-based systems have also been investigated. Typically, the catalyst systems with vanadium [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] and iron [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] have been widely studied for the oxidative dehydrogenation of ethylbenzene with CO 2 . The studies reveal that these catalysts exhibit enhanced redox properties.…”

“…Promoters, such as Li, Cr, Cu, Zn, Mg, Sb, Fe, Co, Ni, K, Mg, Mn, La, and Zr, have been widely used for the oxidative dehydrogenation of ethylbenzene to enhance the activity of the catalysts. [31][32][33][34]41,53,62,[73][74][75]99 With this background knowledge in mind, the aim of this review is to focus on vanadium, iron, mixed oxide and carbon based catalysts employed in the oxidative dehydrogenation of ethylbenzene to styrene. These catalysts have been widely used for the reaction and are discussed in detail in terms of the conversion and selectivity towards styrene.…”

“…The facile redox cycle between fully oxidized and reduced vanadium species is considered more effective in the reaction. [32][33][34][35] Moreover, Sharma et al used a computational and kinetic approach to establish the mechanism for V 2 O 5 / TiO 2 catalyst with the help of an adjunct kinetic study as well as density functional theory calculations. 47 The investigations suggest that the reaction proceeds through a two-stage redox mechanism.…”

Ethylbenzene Dehydrogenation in the Presence of Carbon Dioxide over Metal Oxides

“…Since that time, both the catalyst and the process have undergone several improvements, such as the introduction of beds with radial flow and the use of poison inhibitors (Shreve and Brink, 1997). Several works have been carried out (Santos et al, 2006;Rangel et al, 2003;Ramos et al, 2008;Miyakoshi et al, 2001;Liao et al, 2008) aiming to improve the iron-based catalysts or to find new alternatives systems and process conditions (Holtz et al, 2008;Oliveira et al, 2008;Morán et al, 2007;Ohishi et al, 2005).…”