کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
68214 48507 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Catalytic synthesis of diphenolic acid from levulinic acid over cesium partly substituted Wells–Dawson type heteropolyacid
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Catalytic synthesis of diphenolic acid from levulinic acid over cesium partly substituted Wells–Dawson type heteropolyacid
چکیده انگلیسی

A series of insoluble cesium partly substituted Wells–Dawson type heteropolyacids, CsxH6−xP2W18O62 (x = 1.5–6.0), were synthesized and characterized using the techniques including UV–vis/DRS, FT-IR, XRD, XPS, and N2 porosimetry. As the unique and reusable solid acid catalysts, CsxH6−xP2W18O62 salts were applied to produce diphenolic acid by the condensation reaction of phenol with bio-platform molecule, levulinic acid. For comparison, cesium partly substituted Keggin type heteropolyacids (CsxH3−xPW12O40, x = 1.0–3.0), HCl, HZSM-5, and MCM-49 were also tested. Influences on the catalytic activity and selectivity were considered for factors including solvent, molar ratio of phenol to levulinic acid, amount of catalyst, reaction temperature, stirring speed, and reaction time. The experimental results demonstrated that both Cs1.5H4.5P2W18O62 and Cs2.5H0.5PW12O40 exhibited excellent catalytic performance under solvent-free conditions. Furthermore, both selectivity and activity of Cs1.5H4.5P2W18O62 were higher than those of Cs2.5H0.5PW12O40. Reasons for the different catalytic behaviors between two types of cesium partly substituted heteropolyacids were investigated.

A series of insoluble cesium partly substituted Wells–Dawson-type heteropolyacid, CsxH6−xP2W18O62 (x = 1.5–6.0), are synthesized. As the unique and reusable solid acid catalysts, CsxH6−xP2W18O62 have good catalytic performance for the condensation reaction of phenol with bio-platform molecule, levulinic acid, to produce diphenolic acid under solvent-free condition.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 290, Issues 1–2, 1 July 2008, Pages 44–53
نویسندگان
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