物理化学学报 >> 1997, Vol. 13 >> Issue (06): 548-553.doi: 10.3866/PKU.WHXB19970613

研究论文 上一篇    下一篇

掺杂Pr对VPO催化剂性质的影响

李铭岫,杨述韬,宋天乐,王心葵,张志新,周敬来   

  1. 河北师范学院化学系，石家庄 050091|中国科学院山西煤炭化学研究所，太原 030001
  • 收稿日期:1996-09-23 修回日期:1997-01-27 发布日期:1997-06-15
  • 通讯作者: 李铭岫

Effect of Adding Pr on Properties of VPO Catalyst

Li Zhi-Xiu,Yang Shu-Tao,Song Tian-Le,Wang Xin-Kui,Zhang Zhi-Xin,Zhou Jing-Lai   

  1. Department of Chemistry,Hebei Teachers College,Shijiazhuang 050091|Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001
  • Received:1996-09-23 Revised:1997-01-27 Published:1997-06-15
  • Contact: Li Zhi-Xiu

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摘要：

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钒的氧化态，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，催化剂性能下降.

关键词: VPO催化剂, Pr, 正丁烷, 顺酐

Abstract:

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 reduced.

Key words: Praseodymium, VPO catalyst, n-Butane, Maleic anhydride