Effect of Pt promotion on the Ni-catalyzed deoxygenation of tristearin to fuel-like hydrocarbons

Ryan Loe, Kelsey Huff, Morgan Walli, Tonya Morgan, Dali Qian, Robert Pace, Yang Song, Mark Isaacs, Eduardo Santillan-Jimenez, Mark Crocker

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Pt represents an effective promoter of supported Ni catalysts in the transformation of tristearin to green diesel via decarbonylation/decarboxylation (deCOx), conversion increasing from 2% over 20% Ni/Al2O3 to 100% over 20% Ni-0.5% Pt/Al2O3 at 260C. Catalyst characterization reveals that the superior activity of Ni-Pt relative to Ni-only catalysts is not a result of Ni particle size effects or surface area differences, but rather stems from several other phenomena, including the improved reducibility of NiO when Pt is present. Indeed, the addition of a small amount of Pt to the supported Ni catalyst dramatically increases the amount of reduced surface metal sites, which are believed to be the active sites for deCOx reactions. Further, Pt addition curbs the adsorption of CO on the catalyst surface, which decreases catalyst poisoning by any CO evolved via decarbonylation, making additional active sites available for deoxygenation reactions and/or preventing catalyst coking. Specifically, Pt addition weakens the Ni-CO bond, lowering the binding strength of CO on surface Ni sites. Finally, analysis of the spent catalysts recovered from deCOx experiments confirms that the beneficial effect of Pt on catalyst performance can be partially explained by decreased coking and fouling.

Original languageEnglish
Article number200
JournalCatalysts
Volume9
Issue number2
DOIs
StatePublished - Feb 2019

Bibliographical note

Funding Information:
Funding: This work was supported in part by the National Science Foundation (NSF) under grant Nos. 1437604, Fun1d53in1g63: 7T,h ainsdw 1o4r4k47w79a,s assuwpeplol artse bdyian Rpeasretabrychth SeuNppaotirotn GalraSnctife rnomce tFhoeuUnndiavteiorsnit(yNo Sf FK)eunntudcekryg OrafnfitcNeoofst.h1e 4V3i7c6e04, President for Research and a Grant from the University ofKentucky Student Sustainability Council.

Funding Information:
President for Research and a Grant from the University of Kentucky Student Sustainability Council. Conflicts of Interest: The authors declare no conflict of interest. The funders had no role in the design of the Conflicts of Interest: The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Decarbonylation
  • Decarboxylation
  • Deoxygenation
  • Hydrocarbons
  • Nickel
  • Platinum
  • Triglycerides
  • Tristearin

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Fingerprint

Dive into the research topics of 'Effect of Pt promotion on the Ni-catalyzed deoxygenation of tristearin to fuel-like hydrocarbons'. Together they form a unique fingerprint.

Cite this