Synthesis of CuNi/C and CuNi/-Al₂O₃ Catalysts for the Reverse Water Gas Shift Reaction

Table 2

Cu-Ni surface ratios obtained from XPS measurements.

	Theoretical bulk Cu/Ni ratio from nominal composition	Actual Surface Cu/Ni ratio from XPS	Percentage Increase
Cu20Ni80	0.25	1.2	380%
Cu50Ni50	1	2	100%
Cu80Ni20	4	4.2	5%