Enhancing sulfur tolerance of Pd catalysts by hydrogen spillover with two different zeolite supports for low-temperature hydrogenation of aromatics

Hyun Jae Kim, Chunshan Song

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Pd catalysts supported on zeolite Y and zeolite A (Pd/Y and Pd/A) were prepared separately and combined for improving sulfur tolerance based on our proposed catalyst design concept for low-temperature hydrogenation of aromatics in distillate fuels. After the external surface of Pd/A was passivated by chemical vapor deposition with silica, the resulting SiO2-Pd/A catalyst does not show any catalytic activity for hydrogenation of tetralin. However, adding SiO2-Pd/A to Pd/Y by physical mixing significantly enhanced sulfur tolerance of the Pd catalyst for tetralin hydrogenation in the presence of 100 ppmw sulfur as benzothiophene. The small-pore system (Pd/A) in the hybrid catalyst plays a critical role to maintain the catalytic activity of metal sites in the large-pore system (Pd/Y) in the presence of sulfur, via hydrogen spillover from metal inside the zeolite A pore channel protected by size-selective exclusion of sulfur compounds.

Original languageEnglish (US)
Pages (from-to)6788-6792
Number of pages5
JournalEnergy and Fuels
Volume28
Issue number11
DOIs
StatePublished - Nov 20 2014

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Zeolites
Sulfur
Catalyst supports
Hydrogenation
Hydrogen
Catalysts
Catalyst activity
Metals
Sulfur Compounds
Temperature
Sulfur compounds
Silicon Dioxide
Chemical vapor deposition
Silica
tetralin

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

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abstract = "Pd catalysts supported on zeolite Y and zeolite A (Pd/Y and Pd/A) were prepared separately and combined for improving sulfur tolerance based on our proposed catalyst design concept for low-temperature hydrogenation of aromatics in distillate fuels. After the external surface of Pd/A was passivated by chemical vapor deposition with silica, the resulting SiO2-Pd/A catalyst does not show any catalytic activity for hydrogenation of tetralin. However, adding SiO2-Pd/A to Pd/Y by physical mixing significantly enhanced sulfur tolerance of the Pd catalyst for tetralin hydrogenation in the presence of 100 ppmw sulfur as benzothiophene. The small-pore system (Pd/A) in the hybrid catalyst plays a critical role to maintain the catalytic activity of metal sites in the large-pore system (Pd/Y) in the presence of sulfur, via hydrogen spillover from metal inside the zeolite A pore channel protected by size-selective exclusion of sulfur compounds.",
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AU - Song, Chunshan

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N2 - Pd catalysts supported on zeolite Y and zeolite A (Pd/Y and Pd/A) were prepared separately and combined for improving sulfur tolerance based on our proposed catalyst design concept for low-temperature hydrogenation of aromatics in distillate fuels. After the external surface of Pd/A was passivated by chemical vapor deposition with silica, the resulting SiO2-Pd/A catalyst does not show any catalytic activity for hydrogenation of tetralin. However, adding SiO2-Pd/A to Pd/Y by physical mixing significantly enhanced sulfur tolerance of the Pd catalyst for tetralin hydrogenation in the presence of 100 ppmw sulfur as benzothiophene. The small-pore system (Pd/A) in the hybrid catalyst plays a critical role to maintain the catalytic activity of metal sites in the large-pore system (Pd/Y) in the presence of sulfur, via hydrogen spillover from metal inside the zeolite A pore channel protected by size-selective exclusion of sulfur compounds.

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