Abstract
Reducibility of zeolite encaged Ni2+ was found by temperature programmed reduction to increase in the following order Ni/NaY < Ni/MgY < Ni/CaY < (Pd + Ni)/NaY < (Pd + Ni)/MgY < (Pd + Ni)/CaY. In comparison with NaY supported samples, bimetallic MgY and CaY supported samples exhibited enhanced Pd2+ and Ni2+ reducibility as well as higher Hads/Me ° ratios after reduction below 500 °C. Temperature programmed reduction (TPR) and desorption (TPD) results indicate that Mg2+ and Ca2+ ions are occupying the small cages in the zeolite thus preventing the migration of the majority of Ni2+ and Pd2+ ions to these cages.
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Feeley, J.S., Sachtler, W.M.H. Enhanced reductibility of Ni and Ni + Pd in zeolite Y: Blocking of small cages with Ca2+ or Mg2+ ions. Catal Lett 9, 377–386 (1991). https://doi.org/10.1007/BF00764829
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DOI: https://doi.org/10.1007/BF00764829