(浙江工業(yè)大學(xué) 化學(xué)工程與材料學(xué)院，杭州 310014)
摘 要: 以硝酸鍶和鈦酸丁酯為原料，采用溶膠凝膠法制備了鈣鈦礦型納米SrTiO3。采用紅外光譜、差熱分析、X射線衍射、掃描電鏡及紫外吸收等測(cè)試手段，研究了影響溶膠凝膠過(guò)程的諸因素，對(duì)制備的SrTiO3粉體的結(jié)構(gòu)和性質(zhì)進(jìn)行了表征。結(jié)果表明：乙醇、冰醋酸、水、丙三醇、溫度及pH值均對(duì)溶膠凝膠過(guò)程有明顯影響，其中反應(yīng)溫度對(duì)膠體形成時(shí)間長(zhǎng)短和膠體質(zhì)量影響最明顯。鈣鈦礦型SrTiO3晶體于650 ℃時(shí)生成，隨著熱處理溫度的升高，粉體的物相組成將發(fā)生變化，粉體的尺寸也有所增加，相應(yīng)的紫外吸收峰也出現(xiàn)紅移現(xiàn)象。
關(guān)鍵字: 鈣鈦礦型催化劑;鈦酸鍶; 溶膠-凝膠;晶體結(jié)構(gòu)
by sol-gel process
（College of Chemical Engineering and Material Science,
Zhejiang University of Technology, Hangzhou 310014, China）
Abstract: By using Sr(NO3)2 and Ti(OBu)4 as raw materials, nano-sized SrTiO3 powder was prepared by the sol-gel process. By means of IR, TG-DTA, XRD, SEM and UV analysis, the different factors affecting the sol-gel process were investigated, and the crystal structure and characteristics of the as-prepared SrTiO3 powder were analyzed. The experimental results show that the factors including alcohol, acetic acid, water, propyl alcohol, temperature and pH value have obvious influence in sol-gel process, especially, in which the reaction temperature is the most important factor for the gelation time and quality of the gel. Perovskite SrTiO3 is formed at heat treatment temperature of 650 ℃. With the increase of heat treatment temperature, the phase abundance of SrTiO3 is improved and the SrTiO3 crystal grows as well. A red shift phenomenon is observed in UV spectrum for the corresponding powder.
Key words: perovskite catalyst; strontium titanate; sol-gel; crystal structure
