Promotion Effect of Alkali Metal Hydroxides on Polymer-Stabilized Pd Nanoparticles for Selective Hydrogenation of C–C Triple Bonds in Alkynols

Postimpregnation of Pd nanoparticles (NPs) stabilized within hyper-cross-linked polystyrene with sodium or potassium hydroxides of optimal concentration was found to significantly increase the catalytic activity for the partial hydrogenation of the C–C triple bond in 2-methyl-3-butyn-2-ol at ambient hydrogen pressure. The alkali metal hydroxide accelerates the transformation of the residual Pd(II) salt into Pd(0) NPs and diminishes the reaction induction period. In addition, the selectivity to the desired 2-methyl-3-buten-2-ol increases with the K- and Na-doped catalysts from 97.0 up to 99.5%. This effect was assigned to interactions of the alkali metal ions with the Pd NPs surfaces resulting in the sites’ separation and a change of reactants adsorption.


Published in:
Industrial & Engineering Chemistry Research
Year:
2017
Publisher:
Washington, American Chemical Society
ISSN:
1520-5045
Laboratories:




 Record created 2017-08-17, last modified 2018-12-03

Publisher's version:
Download fulltextPDF
n/a:
Download fulltextJPEG
Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)