Abstract
Pd catalysts supported on active carbon (Pd/C) prepared by impregnation–deposition were used in catalytic hydrogenation and hydrodechlorination (HDC) of 2-chloro-4,6-dinitroresorcinol (CDNR). Characterization by X-ray diffraction, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy, and transmission electron microscopy revealed Pd species in the form of ~3.0-nm Pd nanoparticles composed of Pd0 and Pdn+ dispersed highly on active carbon. Pd/C catalysts with high Pd0/(Pd0 + Pdn+) exhibited high active for hydrogenation of CDNR, while the yield of the target product 4,6-diaminoresorcinol (DAR) largely depended on the solvent media. The correlations of the dielectric constants of the solvents with the activity and selectivity were obtained. Alkanol or acetic acid aqueous solutions were favorable for HDC. No 2-chloro-4,6-diaminoresorcinol product was detected when the reaction was carried out using 80 % ethanol/water media. XPS, energy-dispersive spectroscopy, and high-resolution transmission electron microscopy revealed that strong Cl adsorption caused the decrease in activity and selectivity for DAR of the Pd/C catalysts.
Sign-in/Register to access full text options 
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.
