Spontaneous galvanic deposition of nanoporous Pd on microfibrous-structured Al-fibers for CO oxidative coupling to dimethyl oxalate
Résumé
Nanoporous palladium (np-Pd) is deposited spontaneously on microfibrous-structured Al-fibers (np-Pd/Al-fiber catalyst) via the galvanic replacement between Pd2+ and aluminium metal (2 Al + 3 Pd2+ → 2 Al3+ + 3 Pd). The np-Pd/Al-fiber catalyst combines the high activity and good stability of the np-Pd with the excellent heat conductivity and large permeability of the microfibrous-structured Al-fibers. The np-Pd/Al-fiber catalyst shows four times higher intrinsic activity (i.e., turnover frequency) than the conventional Pd/α-Al2O3 catalyst. The unique nanoporous palladium with interpenetrating network of nanoligaments is responsible for the improved activity in the CO oxidative coupling to dimethyl oxalate (2 CH3ONO + 2 CO → 2 NO + CH3OCOCOOCH3).
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