Effect of Additives TiO2 on Catalyst Performance for Dehydrogenation of Ethylbenzene to Styrene†

doi:10.7503/cjcu20160910

Abstract

Abstract:

The effect of additives TiO₂ on the formation of reactive phase Fe-K spinel and on the catalytic activity was investigated. The properties of catalyst were characterized by XRD, TPR, XPS, BET and SEM. The SEM and XRD results showed that adding moderate TiO₂ can significantly improve the formation of catalytic reactive phase K₂Fe₂₂O₃₄, with decreasing the particle size of CeO₂ and improving its dispersion in catalyst. Furthermore, the XPS and TPR results showed that doping of TiO₂ can reduce the reduction temperature of CeO₂ and active phase K₂Fe₂₂O₃₄, which increases lattice oxygen defects and acid-base sites, improving the activity of the catalyst for ethylbenzene dehydrogenation reaction.

Key words: Ethylbenzene, Catalytic dehydrogenation, Styrene, Fe-K spinel, TiO2

CLC Number:

O643

TrendMD:

LI Xiaoci, XI Zhiwen, LIU Xing, LI Ming, HAO Zhixian, ZHU Zhirong. Effect of Additives TiO₂ on Catalyst Performance for Dehydrogenation of Ethylbenzene to Styrene^†[J]. Chem. J. Chinese Universities, 2017, 38(7): 1229.

Figures/Tables 7

Table 1 Data of surface area and pore structure from nitrogen adsorption of various catalysts

Catalyst	S_BET/(m²·g^-1)	Pore volume/(cm³·g^-1)	Average pore diameter/nm	$I C e 3 d$ / $I F e 2 p$
Cat	9.80	0.0445	18.183	0.259
Cat-1Ti	13.50	0.0672	19.893	0.601
Cat-2Ti	8.16	0.0414	17.921	0.598
Cat-5Ti	5.83	0.0236	16.212	0.542

Table 1 Data of surface area and pore structure from nitrogen adsorption of various catalysts

Catalyst	S_BET/(m²·g^-1)	Pore volume/(cm³·g^-1)	Average pore diameter/nm	$I C e 3 d$ / $I F e 2 p$
Cat	9.80	0.0445	18.183	0.259
Cat-1Ti	13.50	0.0672	19.893	0.601
Cat-2Ti	8.16	0.0414	17.921	0.598
Cat-5Ti	5.83	0.0236	16.212	0.542

Fig.1 SEM images of Cat(A) and Cat-1Ti(B)

Fig.2 XRD patterns of the catalysts with different TiO2 contents a. Cat; b. Cat-1Ti; c. Cat-2Ti; d. Cat-5Ti.

Fig.3 TPR profiles of the catalysts with different TiO2 contentsa. Fe2O3; b. Cat; c. Cat-1Ti; d. Cat-2Ti; e. Cat-5Ti.

Scheme 1 Dehydrogenation mechanism of ethylbenzene on the Fe3+ and Ce3+ acid-base active sites

Fig.4 Fe2p XPS spectra of the catalysts Cat(A, B) and Cat-1Ti(C, D) after being used for 5 h(A, C) and 10 h(B, D)

Fig.5 Reaction activity of ethylbenzene dehydrogenation for catalysts with different TiO2 contents

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Effect of Additives TiO₂ on Catalyst Performance for Dehydrogenation of Ethylbenzene to Styrene^†

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