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Abstract
Supporting extremely small concentrations of noble metals on SiO 2 and Bi 2Mo 3O 12 affected the catalytic activity and product distribution in iso-butane partial oxidation. Supporting Pt, Pd, and Rh onto SiO 2 by 1 atom/μm 2 enhanced the catalytic activity. Selectivity values of partial oxidation products, iso-butene, CH 3C(CH 3)CHO, CH 3CHO and CH 3COCH 3, were increased and CO x selectivity was decreased. Rh/SiO 2 gave an EPR signal due to isolated Rh 2+ ions with g ⊥=2.07 and g ∥=1.95, suggesting that two valent Rh ions are well dispersed on the surface and play a role in the oxidation of iso-butane. Supporting Pd, Ir, Rh, and Au onto Bi 2Mo 3O 12 at a concentration of (1/9)×10 −4 atom/nm 2 increased the conversion, but supporting Pt and Ru decreased it. Selectivity values of CH 2C(CH 3)CHO and CO x were the same for every catalyst. Catalytic activity was increased by supporting them by (1/49)×10 −4 atom/nm 2; especially, supporting Rh increased the activity without changing the selectivity of CH 2C(CH 3)CHO. Supported noble metal will interact with active oxygen ions bridging Mo and Bi on the Bi 2Mo 3O 12 surface. Since a certain concentration of supported noble metals, (1/49)×10 −4 nm 2, begins to affect the catalytic activity and selectivity, this concentration may reflect the concentration of active sites in iso-butane oxidation at 350–400 °C over Bi 2Mo 3O 12.
Published Version
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