کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
691619 1460448 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The synthesis of heterogeneous 7-amino-1-naphthalene sulfonic acid immobilized silica nano particles and its catalytic activity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
The synthesis of heterogeneous 7-amino-1-naphthalene sulfonic acid immobilized silica nano particles and its catalytic activity
چکیده انگلیسی

7-Amino-1-naphthalene sulfonic acid (ANSA) was immobilized onto silica via a simple sol–gel technique to form strong Brønsted acid site, RHANPSO3H. Spherical nano sized catalyst particles were obtained in this study. The 29Si MAS NMR showed the presence of T3, T2, Q3 and Q4 silicon centers. The 13C 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 °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 °C for 24 h.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Taiwan Institute of Chemical Engineers - Volume 42, Issue 5, September 2011, Pages 843–851
نویسندگان
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