Characteristics of La-doped Pt/Al2O3 catalyst prepared by solvent-deficient method and effect on enhancement of dehydrogenation of perhydrodibenzyltoluene

Tae In Park, Seong Ho Lee, Kwan Young Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Liquid organic hydrogen carrier (LOHC) materials have been under the spotlight for the storage, transport and extraction of hydrogen. In particular, the catalytic process for extracting hydrogen from LOHC requires a fairly high level of catalytic technology due to several important issues, such as saving energy consumption due to endothermic reaction, minimizing consumption of LOHC for recycle, and high purity of hydrogen produced. This study focused on the development of La-doped Pt/Al2O3 catalyst with high activity for the dehydrogenation of perhydrodibenzyltoluene (H18-DBT), which is well-known as a LOHC compound. The dehydrogenation performance of the La-doped Pt/Al2O3 catalyst was different depending on the La content it contained. A variety of characterization techniques are used to identify the performance differences of the catalysts. As revealed by the analyses of chemisorption, TEM and XPS, the number of lanthanum oxide particles on the surface of the catalyst increases and block the active sites of platinum, as the amount of La doped in the catalyst increases. However, by donating electrons from lanthanum oxide to platinum, the activity per unit active site of Pt increases. The Pt/La-Al2O3 catalyst doped with 1 wt% La showed much higher activity than that of the Pt/Al2O3, and showed the best performance among the catalysts doped with various amounts of La. In addition, it was found through spin-lattice relaxation analysis that La doping by solution-deficient method did not have a positive effect on the Pt dispersion by creating Al3+penta sites inside the alumina particle rather than on the surface.

Original languageEnglish
Pages (from-to)97-103
Number of pages7
JournalKorean Journal of Chemical Engineering
Volume40
Issue number1
DOIs
Publication statusPublished - 2023 Jan

Bibliographical note

Funding Information:
This study was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIP) (NRF-2019M3E6A1064876).

Publisher Copyright:
© 2023, Korean Institute of Chemical Engineering (KIChE).

Keywords

  • Dehydrogenation
  • Dibenzyltoluene
  • La-doped AlO
  • Liquid Organic Hydrogen Carrier (LOHC)
  • Pt/AlO
  • Solvent-deficient Method

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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