掺杂Pr对VPO催化剂性质的影响

Effect of Adding Pr on Properties of VPO Catalyst

在VPO催化剂中添加Pr，用XRD、LRS、XPS、ESR和31P固体核磁共报考察了催化剂的相组成和机的氧化态，用NH3-TPD和吡啶吸附原位红外光谱表征了催化剂表面的酸量．将催化剂应用于正丁烷选择氧化生成顺酐醉的反应中。实验结果表明，当Pr／V（原子比）＝0．05时，活性相（VO）2P2O7的量增加，表面酸性增强，正丁烷转化率和生成顺酐的选择性都有所很高，而Pr／V＞0．10时，（VO）2P2O7的量减小，表面酸性降低。

Influence of doping Pr on the characteristics of VPO catalyst was investigated by means of XRD, XPS, ESR, 31P NMR, NH3-TPD and IR techniques. The catalysts were used in the selective oxidation of n-butane to maleic anhydride. Experimental results showed that,when Pr/V(atomic ratio)=0.05,the amount of (VO)2P2O7 was increased and the surface acidity was enhanced, and the conversion of n-butane and the selectivity to maleic anhydride reached a maximum value respectively. While Pr/V>0.10, the amount of(VO)2P2O7 and surface acidity were decreased and the activity of catalysts was reduccd.