Preparation and structure characterization of nanospherical MCM- 41 molecular sieves

• Main Authors: CHEN Ting, WEI Yiting, GUO Yajun, CHU Lianfeng, GUO Yaping
• Format: Article
• Language: English
• Published: Academic Journals Center of Shanghai Normal University 2013-04-01
• Series: Journal of Shanghai Normal University (Natural Sciences)
• Subjects: nanosphere; MCM-41; morphology; reaction temperature
• Online Access: http://qktg.shnu.edu.cn/zrb/shsfqkszrb/ch/reader/create_pdf.aspx?file_no=201302010&year_id=2013&quarter_id=2&falg=1

Nanospherical MCM-41 molecular sieves have been synthesized by using hexadecyl trimethyl ammonium bromide (CTAB) as templates and tetraethyl orthosilicate (TEOS) as silicon sources. XRD,SEM,FT-IR,TEM,and N₂ adsorption-desorption isotherms were used to investigate the effects of the reaction temperature and aging time on the morphology and structure of the samples. The results show that the nanospherical MCM-41 particles can be obtained at reaction temperatures between 20 to 80℃. With the reaction temperature increasing,the diameter of the nanospheres increases. When the reaction temperature reaches 110℃,MCM-41 molecular sieves exhibit irregular particle morphology. With the aging time of 0-15 h,the dispersion of nanospherical MCM-41 molecular sieves is very good. However,as the aging time increases,the particle size is also increased,while agglomeration is also more serious. Besides,the optimal synthesis conditions of the nanospherical MCM-41 molecular sieves were obtained by analyzing their formation mechanism.