Hydrogenation of benzene and toluene over supported rhodium and rhodium-gold catalysts

Sapar Konuspayev,T.S Abildin,Minavar Shaimardan,Nurlan Annas,Y.Y Suleimenov,N.F Uvarov

doi:10.1051/matecconf/202134001026

Abstract

Rhodium and rhodium-gold catalysts supported on amorphous aluminosilicates (ASA), titanium dioxide (rutile, TiO2) was prepared in two different ways: absorption and colloidal method. The catalysts were characterized by an inductively coupled plasma optical emission spectrometer (ICP-OES), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The activity and selectivity of the prepared catalysts were tested by the hydrogenation of benzene and toluene. Hydrogenation was conducted at a pressure of 4 MPa and a temperature 80 °C. The bimetallic Rh-Au/ASA catalyst prepared by the absorption method showed higher activity and selectivity in benzene hydrogenation reaction, the same catalyst prepared by the colloidal method demonstrated lower selectivity.

Highlights

The content of aromatic compounds formed during the reforming of gasoline reaches 50%, of which 10% is benzene
We have prepared and characterized rhodium catalysts supported on various carbon carriers and evaluated there catalytic performance in hydrogenation reactions of benzene and toluene [7], as a result, rhodium catalysts supported on activated carbon with a surface area of more than 500 m2/ g were found to be active and selective catalysts that allow selective hydrogenation of benzene in the presence of other aromatic compounds
The catalysts were characterized by inductively coupled plasma-optical emission spectroscopy (ICP-OES), transmission electron microscopy (TEM) and X-ray diffraction (XRD) methods

Summary

Introduction

The content of aromatic compounds formed during the reforming of gasoline reaches 50%, of which 10% is benzene. The most active metal from platinum group for the hydrogenation of aromatic compounds is rhodium supported on various carriers. [3] The authors used various rhodium salts adsorbed onto silica or onto palladium supported on silica (PdSiO2) and prepared bimetallic catalysts were examined for their catalytic arene hydrogenation activities. We have prepared and characterized rhodium catalysts supported on various carbon carriers and evaluated there catalytic performance in hydrogenation reactions of benzene and toluene [7], as a result, rhodium catalysts supported on activated carbon with a surface area of more than 500 m2/ g were found to be active and selective catalysts that allow selective hydrogenation of benzene in the presence of other aromatic compounds. Catalytic use of rhodium supported on amorphous aluminosilicate and titanium oxide, as well as bimetallic rhodium-gold in hydrogenation of benzene and toluene was reported

Materials

Catalyst preparation

Hydrogenation unit

Results and discussion

Method of preparation

Conclusion