Direct synthesis, characterization and catalytic activity of aluminosilicate SBA-15

• Main Authors: Shu-Pei Chiu, 邱淑珮
• Other Authors: Chi-Feng Cheng
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/74275960995279434501

碩士 === 中原大學 === 化學研究所 === 90 === Aluminium-incorporated mesoporous molecular sieves SBA-15 have been obtained by direct synthesis at low acid concentration and at room temperature for 72 h and 90℃ for 24 h. The condition of preparing Na+- [Si, Al]-SBA-15 is Al(NO3)3：NaOH =1：1.25. The resulting materials retain the hexagonal order and physical properties of pure siliceous SBA-15. It shows a very narrow pore size distribution with an average mesopore size of 60Å and a high surface area of 800 m2 / g. The condition of preparing H+- [Si, Al]-SBA-15 is Al(NO3)3：TMAOH = 1：1.0. It also shows narrow pore size distribution with an average mesopore size of 70Å and a high surface area of 700 m2/ g .The morphology of Na+-[Si, Al]-SBA-15 or H+-[Si,Al]-SBA-15 controlled by acid concentration shows a variety of morphology such as rod, U-shape, hexagon, donut, ball and coral. The catalytic activity of the prepared [Si,Al]-SBA-15 was evaluated by using the cumene cracking reaction and was much higher than that of MCM-41 analog. The condition of preparing high order [Si,Al]-SBA-15 is Al(NO3)3：Al(OCH(CH3)2)3 = 1：3. The resulting materials retain the hexagonal order and physical properties of pure siliceous SBA-15 and it can find that major part of aluminum in [Si,Al]-SBA-15 can be easily incorporated into framework of SBA-15 without structure deformation. It shows narrow pore size distribution with an average mesopore size of 70Å and a high surface area of 700 m2/ g .