화학공학소재연구정보센터
Catalysis Today, Vol.57, No.3-4, 275-282, 2000
The promoting effect of Nb2O5 addition to Pd/Al2O3 catalysts on propane oxidation
Pd/Nb2O5/Al2O3 catalysts were investigated on propane oxidation. Diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS) analysis suggested that monolayer coverage was attained between 10 and 20 wt.% of Nb2O5. Temperature programmed reduction (TPR) evidenced the partial reduction of niobium oxide. The maximum propane conversion observed on the Pd/10% Nb2O5/Al2O3 corresponded to the maximum Nb/Al surface ratio. The presence of NbOx polymeric structures near to the monolayer could favor the ideal Pd-0/Pd2+ surface ratio to the propane oxidation which could explain the promoting effect of niobium oxide. (C)2000 Elsevier Science B.V. All rights reserved.