✦ LIBER ✦

The role of water in the catalysis on solid heteropolyacids

✍ Scribed by Anna Micek-Ilnicka

Publisher: Elsevier Science
Year: 2009
Tongue: English
Weight: 883 KB
Volume: 308
Category: Article
ISSN: 1381-1169
DOI: 10.1016/j.molcata.2009.04.003

No coin nor oath required. For personal study only.

✦ Synopsis

Heteropolyacids (HPAs) are used as catalysts for many acid reactions in both homogeneous and heterogeneous systems. For such systems water, as a vapour and/or the crystallization water, plays an essential role. The review surveys the structure of HPA hydrates and the physicochemical properties of HPA-water system. Especially, tendency to the formation of protonated water clusters in the bulk of the solid, together with acid strength and sorption properties are described. The catalytic part of the paper includes following topics: the role of water as a substrate (hydration of olefins), product (dehydration of alcohols) and as water formally not participating in the catalytic reaction (etherification).

📜 SIMILAR VOLUMES

The Mechanism of On-Water Catalysis

✍ James K. Beattie; Christopher S. P. McErlean; Christopher B. W. Phippen 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 221 KB 👁 2 views

On the role of molecular factors in enzy

On the role of molecular factors in enzyme catalysis

✍ S.J. Formosinho; J.J.C. Teixeira-Dias 📂 Article 📅 1987 🏛 Elsevier Science ⚖ 641 KB

Role of water in the physical stability

Role of water in the physical stability of solid dosage formulations

✍ Sari Airaksinen; Milja Karjalainen; Anna Shevchenko; Sari Westermarck; Ella Lepp 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 519 KB

The interaction of moisture with pharmaceutical solids is highly crucial to an understanding of water-based processes, for example, manufacturing processes or prediction of solid dosage form stability and shelf life. Both the active pharmaceutical ingredient (API) and excipients in the formulation h

On the role of the axial ligands in heme

On the role of the axial ligands in heme-based catalysis

✍ I.M.C.M. Rietjens; J. Spee; R. Weiss; A.X. Trautwein; W. Van Dongen; G.W. Canter 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 78 KB

The role of water in the dynamics and pr

The role of water in the dynamics and proton relaxation of solid proteins

✍ E.R. Andrew; D.J. Bryant; T.Z. Rizvi 📂 Article 📅 1983 🏛 Elsevier Science 🌐 English ⚖ 413 KB

The effect of progessive hydration up to 60% by weight of Hz0 and D20 on the proton relasation of polycrystalline achymotrypsin and lysozyme has been examined. The dynamical behaviour of the protein molecules was not affected by hydration. The dynamics of the water molecules was characterized. and t

On the Role of Water in Amide Hydrolysis

✍ Dirk Zahn 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 84 KB 👁 1 views