Table 1.

Size of palladium and gold crystallites calculated based on XRD measurements in Pd-Au/SiO₂ bimetallic catalysts, relative to activity, selectivity, and productivity. Reaction conditions: T = 60 °C, m_cat = 1g, C₀ = 1 mol·dm⁻³, pH = 9, V_O2 = 1 dm³·min⁻¹.

Catalysts	X * [%]	S * [%]	Productivity of Gluconic Ions	Au/Pd [at/at]	Crystallite Size [nm] ***
	-	-	[mol·h−1·gPd−1]		Au	Pd
5% Pd/SiO2	21	51	1.17	0	-	21.3
5% Pd-0.2% Au/SiO2	100	90	4.94	0.02	b.d.l.	5.7
5% Pd-0.5% Au/SiO2	100	90	11.72	0.05	15.1	7.7
5% Pd-1% Au/SiO2	100	99 **	13.57	0.11	8.4	8.2
5% Pd-2% Au/SiO2	49	95 **	5.39	0.22	24.4	5.6
5% Pd-5% Au/SiO2	42	99 **	4.79	0.54	41.3	5.8
5%Au/SiO2	22	70	-	-	43.4	-

* After 2 h of glucose oxidation. ** Gluconic acid was the only product detected by HPLC with Gilson’s prepELS II. *** Crystallite size calculated on the basis of XRD measurements. b.d.l.: Below the detection limit.