Selective hydrogenation of 1,3-butadiene in presence of 1-butene under liquid phase conditions with NiPd/Al2O3 catalysts

Franklin J Méndez,Roger Solano,Claudio Olivera-Fuentes,Julia Guerra,Susana Curbelo,Yanet Villasana,Joaquín L Brito,Marcel Inojosa

doi:10.1007/s13203-016-0149-y

Abstract

The catalytic performance of Al2O3-supported monometallic and bimetallic catalysts in selective hydrogenation of 1,3-butadiene in the presence of 1-butene under liquid phase conditions was studied. Bimetallic catalysts were prepared by the coimpregnation method with the required amounts of the precursors salts [Ni(NO3)2·6H2O and Pd(NH3)4Cl2·H2O] over pellet-form γ-Al2O3 with a constant content of Pd (0.5 wt%) and varying Ni/Pd atomic ratio (0.25, 0.5, 0.75, and 1) obtaining egg-shell profiles of the active components. The catalysts were characterized by X-ray diffraction, temperature-programmed techniques, such as reduction in hydrogen and desorption of ammonia, N2 physisorption, and transmission electron microscopy. The catalytic test showed that the 1,3-butadiene was selectively hydrogenated when bimetallic catalysts were used. The addition of Ni to the Pd-based catalysts suppressed n-butane formation and increased recovery of 1-butene at medium conversion. Therefore, it was observed an improved catalytic performance of the bimetallic catalysts being highest in the case of the 1NiPd/Al2O3.

Highlights

Bimetallic catalysts were prepared by the coimpregnation method with the required amounts of the precursors salts [Ni(NO3)2Á6H2O and Pd(NH3)4Cl2ÁH2O] over pellet-form c-Al2O3 with a constant content of Pd (0.5 wt%) and varying Ni/Pd atomic ratio (0.25, 0.5, 0.75, and 1) obtaining egg-shell profiles of the active components
The catalytic test showed that the 1,3-butadiene was selectively hydrogenated when bimetallic catalysts were used
Alkenes streams produced from cracking processes for use in the petrochemical industry contain small amounts of highly unsaturated hydrocarbons, which cause problems in downstream applications, e.g., because of the oligomerization of such impurities, as 1,3-butadiene (BD) and/or acetylene on the catalyst surface leading to deactivation and increased pressure drop across the catalytic bed

Summary

Introduction

Alkenes streams produced from cracking processes for use in the petrochemical industry contain small amounts of highly unsaturated hydrocarbons, which cause problems in downstream applications, e.g., because of the oligomerization of such impurities, as 1,3-butadiene (BD) and/or acetylene on the catalyst surface leading to deactivation and increased pressure drop across the catalytic bed. Selective hydrogenation is an effective and economic way of removing these impurities by transforming them into valuable alkenes [1] This technology employs catalytic fixed beds with cocurrent flow of the liquid hydrocarbons and gaseous hydrogen, operating temperatures ranging from ambient temperature up to around 60–70 °C and total pressure up to about 200 psi for maintaining the hydrocarbon stream in liquid phase while allowing the desired level of hydrogen partial pressure [2, 3]. Aiming at minimizing these disadvantages has led to the development of Pd-based bimetallic catalysts, to further improve their selectivity and resistance to deactivation and/or poisoning In this regard, some researchers have made important modifications to the Pd/Al2O3 catalyst [1]

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