Influence of calcination temperature on the structure and properties of Al2O3 as support for Pd catalyst

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Abstract

We investigated the influence of the calcination temperature on the structural properties of Al2O3 and how the resultant Al2O3 support affects the characteristics of Pd/Al2O3 catalysts. Al2O3 pretreated at different calcination temperatures ranging from 500 °C to 1,150 °C, was used as catalyst supports. The Pd/Al2O3 catalysts were prepared by a deposition-precipitation method using a pH 7.5 precursor solution. Characterization of the prepared Pd/Al2O3 catalysts was performed by X-ray diffraction (XRD), N2-physisorption, CO2-temperature programmed desorption (TPD), CO-chemisorption, and field emission-transmission electron microscopic (FE-TEM) analyses. The CO-chemisorption results showed that the Pd catalyst with the Al2O3 support calcined at 900 °C, Pd/Al2O3 (900), had the highest and most uniformly dispersed Pd particles, with a Pd dispersion of 29.8%. The results suggest that the particle size and distribution of Pd are related to the phase transition of Al2O3 and the ratio of isolated tetrahedral to condensed octahedral coordination sites (i.e., functional groups), where the tetrahedral sites coordinate more favorably with Pd.

Keywords

Aluminum Oxide Deposition-precipitation Functional Group Palladium Nanoparticle Phase Transition 

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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2018

Authors and Affiliations

  1. 1.Ulsan Regional DivisionKorea Institute of Industrial Technology (KITECH)UlsanKorea
  2. 2.Department of Polymer Science and Chemical EngineeringPusan National UniversityBusanKorea
  3. 3.Department of Chemical & Biological EngineeringThe University of British ColumbiaVancouverCanada

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