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Title: Effects of catalyst precursor type and preparation conditions, and solvent type on activity and selectivity of Pt/SiO2 catalyst in citral hydrogenation
Authors: Depboylu, Can Okan
Yılmaz, Selahattin
Akkurt, Sedat
Keywords: Activation temperature
Unsaturated alcohols
Catalyst selectivity
Publisher: Walter de Gruyter GmbH
Source: Depboylu, C. O., Yılmaz, S., and Akkurt, S. (2011). Effects of catalyst precursor type and preparation conditions, and solvent type on activity and selectivity of Pt/SiO2 catalyst in citral hydrogenation. International Journal of Chemical Reactor Engineering, 9.
Abstract: In this study, citral hydrogenation reaction in liquid phase over silica gel supported Pt catalysts was investigated. It was desired to hydrogenate carbonyl group selectively to produce valuable unsaturated alcohols, namely geraniol and nerol. Pt/SiO2 catalysts were prepared by impregnation method. The effects of parameters investigated in the present study included Pt precursor type (hexachloroplatinic acid (HCLPA), platinum II acetylacetonate (PAA)), catalyst activation temperature (350°C and 450°C), catalyst activation without calcination, catalyst washing with 0.1 M NaOH and solvent type (ethanol, 2-pentanol). The catalysts activities and selectivities were affected by the type of precursor and activation temperature. The maximum citral conversion (89.50 percent) was achieved at lower activation temperature (350°C) with PAA precursor based catalyst. It was observed that higher activation temperature provided lower citral conversion but higher selectivity to unsaturated alcohols; increasing the activation temperature to 450°C decreased citral conversion to 26.10 percent. But selectivity to unsaturated alcohols, geraniol and nerol, increased from 7.06 to 54.60 percent. Catalyst washing and 2-pentanol prevented acetal formation. Catalyst activation without calcination gave lower citral conversion (20.84 percent) and selectivity to unsaturated alcohols (30.00 percent). Copyright © 2011 The Berkeley Electronic Press. All rights reserved.
ISSN: 1542-6580
Appears in Collections:Chemical Engineering / Kimya Mühendisliği
Mechanical Engineering / Makina Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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