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Superbasic sodium stannate as catalyst for dehydrogenation, Michael addition and transesterification reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
41229 45881 2011 6 PDF Available
Title
Superbasic sodium stannate as catalyst for dehydrogenation, Michael addition and transesterification reactions
Abstract

It has been shown that sodium stannate with superbasic sites generated on its surface can be obtained through simple thermal treatment of sodium stannate hydrate in pure N2. In this study, we analyzed the as-prepared materials using powder X-ray diffraction, X-ray photoelectron spectroscopy, and N2 physisorption methods. The superbasic sites were characterized by techniques of Hammett indicators and temperature-programmed desorption using CO2 as adsorbate. It was shown that after undergoing calcination at 623 K, there are ample superbasic sites on sodium stannate: up to 0.254 mmol/g. The superbasicity of the materials was further confirmed by employing the 1-hexene as well as cyclohexa-1,4-diene double bond isomerization reactions. The superbasicity is attributed to the higher electron-donating ability of surface O2−. The sodium stannate samples showed excellent catalytic efficiency towards selected reactions, namely the dehydrogenation of propa-2-nol, Michael addition of electron-deficient olefins, and transesterification of cyclic carbonate with methanol. It was observed that with rise of heat-treatment temperature from 573 to 623 K, both superbasicity and catalytic activity increased, reaching a maximum at 623 K, and then declined. It is deduced that catalytic efficiency is closely related to superbasicity of the sodium stannate catalysts.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (163 K)Download as PowerPoint slideHighlights► Superbasicity was directly generated on sodium stannate through thermally treating sodium stannate hydrate at 623 K. ► The superbasicity was confirmed using a combination of characterization techniques and probe reactions. ► The as-prepared superbase shows wide catalytic applications with high efficiency. ► The catalytic efficiency of the superbase is related to its superbasicity.

Keywords
Superbase sodium stannate; Double bond isomerization; Michael addition; Dehydrogenation; Transesterification
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Superbasic sodium stannate as catalyst for dehydrogenation, Michael addition and transesterification reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 406, Issues 1–2, 18 October 2011, Pages 113–118
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us