12-Tungstophosphoric acid immobilized on modified macroporous phenol-furfural sulfonic acid resin for tert-butylation of p-cresol.
✍ Scribed by Zhi-Ring Su; Tie-Jun Wang
- Book ID
- 103997801
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 470 KB
- Volume
- 28
- Category
- Article
- ISSN
- 1381-5148
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✦ Synopsis
1%Tungstophosphoric acid (HPW) had been immobilized on phenol-furfural sulfonic acid resin (PFuSR) using y-aminopropyltriethoxy silane (KH). FT-IR spectra indicate that the immobilized HPW on KH modified PFuSR (PFuSR-KH) keeps its Keggin structure and IR subtraction spectra confirm the immobilization of HPW on PFuSR-KH through the interaction between amino groups of KH and bridge oxygen atom of W3013. XRD patterns of the HPW illustrate that its second-order structure is changed greatly after being immobilized. The immobilized HPW on KH-modified PFuSR not only maintains its selectivity but also possesses high acidic activity in catalyzing t-butylation of p-cresol with t-butanol, though the by-product water hindered the reaction. The PFuSR-KH-immobilized HPW loses oniy half of its activity after being reused five times, while the PFuSR-supported one has no catalytic activity in the second run.