(631g) Using Ni@Pt Overlayer Catalysts for Dry Reforming of Ethane Reaction
AIChE Annual Meeting
2021
2021 Annual Meeting
Catalysis and Reaction Engineering Division
Catalyst Design, Synthesis, and Characterization V - Structure/Activity relationship studies III
Thursday, November 11, 2021 - 4:50pm to 5:10pm
Temperature programmed reduction (TPR) showed both Pt and Ni reduction peaks, and the integrated peaks show the amount of Pt is approximately similar to the Pt needed for a monolayer coverage of parent Ni. Chemisorption isotherm of CO shows a similar curve as the previous Ni@Pt overlayer catalysts supported on alumina, where overlayer catalysts have lower CO adsorption than the monometallic catalysts at low pressure. Pulse chemisorption of H2 was also performed, where the Ni@Pt overlayer catalysts have minimal adsorption compare to the Pt and Ni monometallic catalysts. Both chemisorption analyses indicate the metal surface electronic structure has been changed, where the overlayer catalysts have been shown to have decreased adsorption strength of CO and H2 compared to monometallic Pt. The reaction performance data shows that the overlayer catalysts have a more stable performance than the Ni and Pt monometallic and Ni-Pt random structure catalysts. Additionally, the kinetic study of catalysts also shows that the overlayer catalysts have much lower activation energy compared to monometallic catalysts for C2H6 and CO2.
Overlayered catalysts have promising performance compared with monometallic or Pt-Ni random structure bimetallic catalysts. However, additional calculations (DFT) and characterizations such as XAS, HS-LEIS, and in-situ DRIFTS will be conducted to understand the system comprehensively.