Synthesis of Electroless Cu-Ni-Mo-P/Al_2O_3 for Glycerol Hydrogenolysis to Propan-1,2-diol

摘要

A new electroless bath was formulated using a mixture of two reducing agents - NaH_2PO_2 and formaldehyde - for the synthesis of electroless Cu-Ni-Mo-P at pH of 10.2 and 80°C. High material loading was obtained at high Cu~(2+)/ Ni~(2+) molar ratio (＞ 1.0) in the electroless bath. In contrast, hypophosphite only baths were limited to deposit Cu-Ni-Mo-P only when the Cu~(2+)/ Ni~(2+) molar ratio in solution is below 0.17. The deposits were characterized using SEM, EDX and XRD. The deposited Cu-Ni-Mo-P catalyst was crystalline. Within Cu~(2+)/ Ni~(2+) molar ratio range of 0.08 - 1.0, the deposits contained 85-95.8% copper, 14.6 - 4% Ni, 0.26 - 0.15% Mo and 0.1-0.03% P. The results show the feasibility of the use of a mixture of reducing agents in electroless plating.