高等学校化学学报 ›› 1988, Vol. 9 ›› Issue (3): 304.

• 研究简报 • 上一篇    下一篇

正磷酸硅晶相形成温度与配酸比的研究

韩维屏, 赵峥   

  1. 哈尔滨师范大学表面化学研究所
  • 收稿日期:1986-10-28 出版日期:1988-03-24 发布日期:1988-03-24
  • 基金资助:

    中国科学院科学基金

Studies on the Formation Temperatures of Si3(PO4)4 and Acid Ratio of P2O5/SiO2 Catalysis

Han Weiping, Zhao Zheng   

  1. Institute of Surface Chemistry, Harbin Normal University, Harbin
  • Received:1986-10-28 Online:1988-03-24 Published:1988-03-24

摘要: 4,4-二甲基二氧六环-1,3(DMDO)催化制异戊二烯P2O5-SiO2(0.6)催化剂,高温长时间活化能形成Si3(PO4)4,有良好的选择性.前文[1]配酸比在0~2都可形成Si3(PO4)4,0.8和1.2的选择率虽然不变,但DMDO转化率却明显下降,同时发现颗粒间粘接.

Abstract: The phase formation of Si3(PO4)4 for P2O5/SiO2 catalysts has been investigated by XRD, reaction chroma tography and amine adsorption.The results showed that the 400~500℃ is important range of phase formation, if the calcination temperature below them, with the increase of temperature, the crystallinity and crystallite size will be advance, if the temperature higher than this range, such as 500~800℃, the crystallinity and crystallite size retain constants.As it happens, it can be found from the variations of DMDO delivery volume and surface acid concentration, there are indicated turning points in 400~500℃.But also the relative surface area of crystal phase of Si3(PO4)4 and relative yield of isoprcne reach maxmarn within the range of temperatures 500~800℃.The reasons for the adhesion between catalyst particles arc also explained.

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