摘要
纯三氧化钼和负载型三氧化钼(如MoO_3/SiO_2)对红外光均有强的本底吸收,因此对其红外光谱的研究并不多,用激光喇曼光谱对其进行研究可以得到许多各种频率的振动峰归属的有益结果.本文用原位傅里叶交换红外光谱研究了近常压下MoO_3/SiO_2与氧、氢、氨等气体的相互作用.这种研究文献中尚不多见.
The interaction between MoO3/SiO2 and oxygen, ammonia was studied by in situ FT-IR under various experimental conditions. Oxygen could be adsorbed on MoO3/SiO2 in the atmosphere of O2 at different temperatures. The adsorption species might be Mo = O and Mo-O-Mo, the infrared absorption frequencies of Mo = O are -950cm-1, -980cm-1 and of Mo-O-Mo -878cm-1 respectively. When oxygen was degassed, the adsorbed oxygen would be desorbcci quickly. At room temperature, the adsorption of ammonia on MoO3/SiO2 caused Mo = O in the sample disappeared, but MoO3 in the sample was reduced by ammonia at 573K. The adsorption of ammonia on MoO3/SiO2 and the reduction of MoO3/ SiO2 by NH3 hardly took place at 453K.
