Abstract
The effect of support material on Rh/X catalysts has been studied by using CO as a probe molecule for chemisorption and ir spectroscopy as the analytical method. Support materials including TiO/sub 2/, Al/sub 2/O/sub 3/, SiO/sub 2/, kaolinite, and montmoroillonite have been compared as to their tendencies to produce the various CO/RH/X species generally attributed to this catalytic system. The TiO/sub 2/ and SiO/sub 2/ supports enable the most facile reduction of a rhodium precursor material to rhodium metal. Although all of the Rh/X catalysts contain some Rh(I) sites, alumina-supported ones contain the most nonmetallic rhodium. Kaolinite and montmorillonite may contain impurities which tend to poison the Rh sites for CO chemisorption. The CO/Rh/SiO/sub 2/ infrared bands are much less intense than for alumina- or titania-supported rhodium. This is probably due to weak metal/support interaction for Rh/SiO/sub 2/ because the silica employed was of high purity. 3 figures.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
