Sol–Gel Approach for Design of Pt/Al2O3-TiO2 System—Synthesis and Catalytic Tests

Ceramics

Robert E. Przekop¹  Agnieszka Martyła¹  Piotr Marciniak¹  Bogna Sztorch¹  Mariusz Pietrowski²  Michał Zieliński²  Miłosz Frydrych²  Marta Dobrosielska³ 

[1] Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 10, 61-614 Poznań, Poland;Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland;Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland;

关键词: sol–gel;    TiO₂;    Al₂O₃;    catalytic;    hydrogenation;    platinum;   

DOI  :  10.3390/ceramics4040047

来源: DOAJ

【 摘 要 】

Al₂O₃-TiO₂ systems with Ti:Al 0.1, 0.5 and 1.0 molar ratio obtained by the sol–gel method have been used as a platinum support. As a precursor of alumina gel, aluminum isopropoxide has been chosen. Titanium tert-butoxylate was applied to obtain titania gel and hexachloroplatinic acid was applied as a source of platinum. The systems have been characterized by the following methods: thermogravimetric analysis (TGA), Fourier transformation infrared spectroscopy (FTIR), X-ray powder diffraction (XRPD), low-temperature nitrogen adsorption–desorption isotherms (BET, BJH), temperature-programmed reduction with hydrogen (TPR-H₂) and hydrogen chemisorption. Reactions of toluene to methylcyclohexane and selective o-chloronitrobenzene (o-CNB) to o-chloroaniline (o-CAN) hydrogenation were used as the tests of systems’ catalytic activity. The application of Al₂O₃-TiO₂ as a support has enabled the obtaining of platinum catalysts showing high activities for hydrogenation of toluene and selective hydrogenation of o-chloronitrobenzene to o-chloroaniline in the liquid phase. The highest activity in both reactions has been found for Pt/Al₂O₃-0.5TiO₂ catalyst and the highest selectivity for Pt/Al₂O₃-. The activity of Pt/Al₂O₃-TiO₂ catalysts was higher than that of alumina-supported ones.

【 授权许可】

Unknown