CO2 hydrogenation to methanol over PdZn catalysts on bimetallic modified dendritic mesoporous silica nanospheres

Xilong Wang*, Mohnnad H. Alabsi, Xingzhu Chen, Aijun Duan, Chunming Xu, Kuo Wei Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Catalysts with the CeTi bimetallic modified dendritic mesoporous silica nanospheres (CTD) as supports, and the PdZn as active metal phase, PdZn/CTD catalysts with higher Pd metal dispersion and more oxygen vacancies were synthesized for efficient CO2 hydrogenation to methanol (MeOH). The modification of PdZn/CTD using CeTi metals can increase the dispersion of PdZn and improve the Ce3+/Ce4+ ratios. Higher active metal dispersion of PdZn/CTD catalyst is conducive to more H2 adsorption and to the expose of activation sites. Higher Ce3+/Ce4+ ratio of PdZn/CTD is beneficial to generate more oxygen vacancies, which can adsorb and activate CO2 molecules efficiently. The optimized PdZn/CTD catalysts exhibit superior CO2 conversion (33.6 %), MeOH selectivity (32.9 %), MeOH yield (11.1 %), TOF value (22.5 h−1), space–time yield (STY) (4.44 molMeOH kg-1 h−1) and 100 h long-term stability. Besides, through in-situ DRIFTS, HCOO* and CH3O* species are found to be the primary intermediates of the CO2 hydrogenation to MeOH reaction over the PdZn/CTD catalysts.

Original languageEnglish (US)
Article number146596
JournalChemical Engineering Journal
Volume476
DOIs
StatePublished - Nov 15 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Bimetallic modification
  • CO hydrogenation
  • Hydrogen dissociation
  • Methanol
  • Oxygen vacancy

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

Fingerprint

Dive into the research topics of 'CO2 hydrogenation to methanol over PdZn catalysts on bimetallic modified dendritic mesoporous silica nanospheres'. Together they form a unique fingerprint.

Cite this