Catalytic activities for Pd/SiO₂ and Pd–PVP catalysts under different reduction conditions.

Catalysts	Additives	H2 conv. (%)	H2O2 selec. (%)	Ref.
Pd–PVP(1)	H3PO4	7.5	72	This study
Pd/rutile TiO2	H3PO4	9	56	43
Pd/N–TiO2(c)	H2SO4	6	75	44
Pd/hydroxyapatite	H2SO4	2	94	31
Pd/mesoporous anatase TiO2	H2SO4	40	40	45
Pd–tellerium/TiO2	H2SO4	6	100	46
Au–Pd alloy	H2SO4	None	59	47
Au–Pd alloy	None	32	40	48