物理化学学报 >> 2001, Vol. 17 >> Issue (07): 577-581.doi: 10.3866/PKU.WHXB20010701

通讯    下一篇

耐温高比表面氧化锡制备

尉继英;朱月香;谢有畅   

  1. 北京大学物理化学研究所 北京 100871
  • 收稿日期:2001-03-12 修回日期:2001-04-24 发布日期:2001-07-15
  • 通讯作者: 谢有畅 E-mail:yxie@pku.edu.cn

Preparation of Tin Dioxide Powder with High Specific Surface Area and Stability at High Temperature

Wei Ji-Ying;Zhu Yue-Xiang;Xie You-Chang   

  1. Physical Chemistry Institute of Peking University,Beijing 100871
  • Received:2001-03-12 Revised:2001-04-24 Published:2001-07-15
  • Contact: Xie You-Chang E-mail:yxie@pku.edu.cn

摘要: 对比了氨水或NaOH共沉淀和尿素水解均相沉淀三种不同的制备方法,以及NaOH沉淀不 同的老化条件下制备的SnO2粉体材料的比表面以及烧结特性.实验结果表明,减慢成核速度 及在母液中高温老化都有利于提高初始粒子的晶化程度和焙烧后样品的比表面.以NaOH共沉 淀,在100 ℃下回流老化48 h制备的SnO2具有最大的比表面和最好的烧结性能,在500、800 和1000 ℃焙烧后比表面分别为94、75和53 m2穏-1.初始粒子晶化程度的提高以及材料中 硬团聚的减小是改善SnO2烧结性能的主要原因.

关键词: SnO2, 比表面, 氧化物制备

Abstract: Comparison of the influences of the preparation methods and reaction conditions to the properties of SnO2 powder,especially the specific surface area and the stability under high temperature calcination were performed.SnO2 prepared by precipitation method using NaOH solutions as the precipitating agent in the pH region of 10 and aged at100℃ for 48h had the highest BET surface area of 93.5m2 g-1 after calcination at 500℃ for 4h.The materials maintained a surface area of75.2m2 g-1 after 800℃ and 53.2m2 g-1 after 1000℃ alcination. The sample using NH3 H2O as precipitation agent had the lowest BET surface area calcinied under the above three temperatures.It was shown that using NaOH as precipitation agedt and digestion at high temperature was beneficial to maintain high surface area and good stability under high temperature.One of the reas ons is that the digestion under high temperature reduced the water content in th e hydrous tin oxide gel,so the initial structure of the particle was enhanced du ring the drying and calcining process.The other reason is that the crystallizati on of the initial particles was enhanced during the digestion and the defect on the surface was reduced also,so the sintering due to the surface diffusion was restrained.Further more,washing with ethanol reduced the formation of hardcore agglomeration between the particles,thus improved the stability of the particles under high temperature calcining process.

Key words: SnO2, Specific surface area, Preparation