Abstract
An activated carbon-supported palladium catalyst for hydropurification of crude terephthalic acid was prepared by coating coconut activated carbon with Pd nanoparticles synthesized from colloid solution containing ternary surfactants. The performance and microstructure of catalysts were investigated by means of scanning electron microscope, high resolution transmission electron microscope, H2 chemisorption and high performance liquid chromatography. The results show that the Pd particles in colloidal dispersion have a narrow size distribution and the average size is about 6.45nm. The conversion rate of 4-carboxy benzaldehyde nearly reaches 100% under reaction temperature of 278°C, H2 partial pressure of 0.5MPa and reaction time of 1h. The catalyst remains nearly stable after five consecutive hydropurification tests. When the concentration of these surfactants is 0.67g/L, the catalytic performance of catalyst remains relatively high value. The ternary surfactants of Brij 35-Tween 80-CTAB provides a dense micellar layer which warps and minimizes the colloids particles and as a result the catalytic activity and stability of catalysts are increased.
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 callMore From: Colloids and Surfaces A: Physicochemical and Engineering Aspects
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.
