The synthesis of heterogeneous 7-amino-1-naphthalene sulfonic acid immobilized silica nano particles and its catalytic activity

作者：Adam Farook^*; Hello Kasim Mohammed; Ben Aisha Maysun Ramadan

来源：Journal of the Taiwan Institute of Chemical Engineers, 2011, 42(5): 843-851.

DOI：10.1016/j.jtice.2011.02.002

• Surface modification
• Sol-gel technique
• Bronsted acid
• Esterification
• Silica

7-Amino-1-naphthalene sulfonic acid (ANSA) was immobilized onto silica via a simple sol-gel technique to form strong Bronsted acid site, RHANPSO(3)H. Spherical nano sized catalyst particles were obtained in this study. The (29)Si MAS NMR showed the presence of T(3), T(2), Q(3) and Q(4) silicon centers. The (13)C MAS NMR analysis showed the presence of three chemical shifts consistent with the three carbon atoms of the propyl group. Chemical shifts in the range 122.2-138.9 ppm indicate the presence of the naphthalene ring. The catalytic performance of RHANPSO3H was tested in the esterification of n-butyl alcohol with different mono and di-acids at 117 degrees C with 88% conversion of respective alcohols and 100% selectivity towards the ester. The catalyst could be regenerated by washing with ethanol and drying at 180 degrees C for 24 h.

• 出版日期2011-9