Abstract
Mono- and bimetallic palladium–gold catalysts supported on zirconia and ceria, both sulfated and non-sulfated, are tested for the direct synthesis of hydrogen peroxide under very mild (1 bar and 20 °C) and non-explosive conditions. Catalysts are characterized by N 2 physisorption, sulfur content analysis, temperature programmed reduction (TPR), Fourier transmission infrared (FTIR) spectroscopy and high resolution transmission electron microscopy (HRTEM). Catalytic tests are carried out with different gas mixtures and after various pretreatments. Best catalytic results are observed using sulfate doped zirconia samples and H 2/O 2 mixtures containing a large excess of oxygen. Monometallic gold catalysts are completely inactive, while the addition of gold to palladium improves both the productivity and the selectivity of the process. Surface oxidized Pd and Pd–Au catalysts pretreated with hydrogen and oxygen show higher activity and selectivity with respect to non-pretreated samples. A mechanistic explanation is proposed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.