caa a22 4500 475815653 CHVBK 20180406123809.0 cr unu---uuuuu 170329e20001001xx s 000 0 eng 10.1023/A:1004014624562 doi (NATIONALLICENCE)springer-10.1023/A:1004014624562 Kinetics and mechanism of the formation of doped skeletal copper catalysts: the effect of zincate compared to undoped and chromate-doped systems [Elektronische Daten] [A.J. Smith, T. Tran, M.S. Wainwright] Addition of zincate to the leach liquor for the preparation of skeletal copper increases the copper surface area; however it does not stabilize the structure against rearrangement. The leaching kinetics have been studied using a rotating disc electrode (RDE) at 269-293 K in 2-8 M NaOH and 0.0005-0.1 M Na2ZnO2. Zincate ions precipitate as zinc oxide, due to the local consumption of hydroxide ions near the leach front as the aluminium dissolves. This oxide hinders the aluminium dissolution, slowing the leaching rate. It also hinders copper dissolution/redeposition and prevents copper diffusion, thus reducing the structural rearrangement significantly, and causing the formation of a much finer copper structure with increased surface area. The zinc oxide redissolves as the leach front passes, releasing the copper to rearrange once more, thereby allowing the surface area to decrease with time. The activation energy for leaching was found to be 84 ± 6 kJ mol−1. Kluwer Academic Publishers, 2000 de-alloying nationallicence Raney® nationallicence selective dissolution nationallicence structure nationallicence zinc additive nationallicence Smith A.J. School of Chemical Engineering and Industrial Chemistry, University of New South Wales, Sydney, Australia, 2052 aut Tran T. School of Chemical Engineering and Industrial Chemistry, University of New South Wales, Sydney, Australia, 2052 aut Wainwright M.S. School of Chemical Engineering and Industrial Chemistry, University of New South Wales, Sydney, Australia, 2052 aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/10(2000-10-01), 1103-1108 0021-891X 30:10<1103 2000 30 10800 https://doi.org/10.1023/A:1004014624562 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1004014624562 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Smith A.J. School of Chemical Engineering and Industrial Chemistry, University of New South Wales, Sydney, Australia, 2052 aut NATIONALLICENCE 700 1- Tran T. School of Chemical Engineering and Industrial Chemistry, University of New South Wales, Sydney, Australia, 2052 aut NATIONALLICENCE 700 1- Wainwright M.S. School of Chemical Engineering and Industrial Chemistry, University of New South Wales, Sydney, Australia, 2052 aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/10(2000-10-01), 1103-1108 0021-891X 30:10<1103 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer