Effect of retained chlorine in ENCAT™ 30 catalysts on the development of encapsulated Pd: insights from in situ Pd K, L3 and Cl K-edge XAS

Newton, Mark. A.; Nicholls, Rachel; Brazier, John B.; Nguyen, Bao N.; Mulligan, Christopher J.; Hellgardt, Klaus; Barreiro, Elena M.; Emerich, Hermann; Kuok (Mimi) Hii, King; Snigireva, Irina; Thompson, Paul B. J.

doi:10.6084/m9.figshare.5267617.v1

ycsr_a_1348711_sm9237.docx (439.26 kB)

Effect of retained chlorine in ENCAT™ 30 catalysts on the development of encapsulated Pd: insights from in situ Pd K, L₃ and Cl K-edge XAS

journal contribution

posted on 2017-08-02, 09:47 authored by Mark. A. Newton, Rachel Nicholls, John B. Brazier, Bao N. Nguyen, Christopher J. Mulligan, Klaus Hellgardt, Elena M. Barreiro, Hermann Emerich, King Kuok (Mimi) Hii, Irina Snigireva, Paul B. J. Thompson

In situ X-ray absorption spectroscopy (XAS) and Pd K, L_III, and Cl K-edges shows that Cl can be present in significant amounts in ENCAT™ 30 catalysts and that it can severely retard Pd nanoparticle (NP) development in flowing solvents. We also show that whilst polymeric encapsulation protects the Pd against solvent induced agglomeration of Pd nanoparticles the evidence suggests it does not prevent the formation PdH_x through reaction with the aqeous ethanol solvent, and that, as received, ENCAT™ 30 NP catalysts are not, for the most part, comprised of nanoparticulate Pd⁰ irrespective of the presence of Cl.