CO Oxidation on Pd(110)

摘要: Palladium offers some scope as an alternative precious metal for use in catalytic removal of pollutants from automobile exhaust gases. An understanding the operation this depends partly on developing a fundamental knowledge surface properties adsorption and reaction. We have used science methods to investigate reaction CO O 2 Pd(110) using molecular beam reactor, temperature programmed desorption scanning tunnelling microscopy (STM). Both stick efficiently (S O2^ = 0.42± 0.02, SCO =0.52± at room temperature) react with high probabilities temperatures low 310 K, providing that coverage is low; pre-coverages poisoned. There appears be initial (0.64± 0.1 monolayers) above which sticking drastically reduced. Experiments mixed beam, run step wise increase temperature, show steady state rate production result poisoning surface. The goes through maximum 396 K then diminishes due equilibrium CO. Transient 'Light-off observed self acceleration when begins desorb. STM images oxygen c(2×4) structure been obtained 520 K. grossly reconstructed roughened by there considerable inhomogeneity overlayer structure. features may linked subsurface formation. clean off 300 leaves (1×2) Pd