The chemistry of formic acid on oxygen modified Ru(0 0 1) surfaces

摘要: Abstract The effect of oxygen pre-coverage on the chemistry formic acid modified Ru(0 0 1) surfaces was analysed by reflection–absorption infrared spectroscopy (RAIRS). O/Ru(0 0 1) ( θ O between 0.25 and 0.6 ML) were exposed to a very low dose (0.05 L) at 90 K, subsequently annealed. A  = 0.25 ML) promotes production intermediate formate O–H bond cleavage, 90 K. On contrary, high pre-coverages  ⩾ 0.5 ML) inhibit deprotonation reaction, leading some physical adsorption acid. At monodentate observed all surfaces, co-adsorbed with bidentate (C 2v ) or acid, for pre-coverage, respectively. thermal activation is required converting into more stable formate. This process occurs irreversibly 100 K (for 110 K  ⩾ 0.5 ML). stability maximized an coverage 0.25 ML, as its initial decomposition temperature increases from 120 K (on clean surface) 130 K, dropping again higher coverages. Since carbon monoxide detected reaction product both there no evidence mechanism involving exclusively C–H breaking (leading only CO 2 surfaces.