Abstract
Pd/C and CoPd/C heterogeneous catalysts have been synthesized by adopting Charge Enhanced Dry Impregnation (CEDI). The particles size distribution, their high metal surface-to-bulk ratios, and synthesis feasibility are unmatchable to any known noble metal bimetallic heterogeneous catalyst preparation techniques. Next generation Fuel Cells and Fischer-Tropsch catalytic processes economy will be benefited from the proposed methodology.
Highlights
Noble metal heterogeneous catalysts have found various industrial applications and, play a major role in the world economy
The point of zero charge of these carbons is 8.9 and 9.5, respectively. These carbon samples were oxidized by boiling in concentrated 15.9 M HNO3 for 5 h, which brought down the PZC to 2.5 and 2.65 for BPox and VXCox, respectively, due to surface oxidation and formation of acidic functional groups [18]
[Pd(NH3 )4 ](NO3 )2 precursors are dissolved in 1 M HNO3, and when using activated carbons, VXCox and BPox precursors are dissolved in 1 M NH4 OH instead of H2 O
Summary
Noble metal heterogeneous catalysts have found various industrial applications and, play a major role in the world economy. If the oxide surface is positively charged it can adsorb anions and vice versa. Ions cannot adsorb at point of zero charge (PZC) of metal oxides, as the surface is neutral due to unaltered surface hydroxyl groups. When the oxide is in contact with a solution of which the pH is less than PZC, the hydroxyl groups protonate and acquire a positive charge and show affinity towards anions like [PtCl6 ]2 ́. When it is contacted with higher pH solution, the oxide surface shows affinity towards cations like [Pt(NH3 )4 ]2+.
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