By Chaitanya K. Narula

ISBN-10: 0824793102

ISBN-13: 9780824793104

This paintings info the old improvement of the ceramic precusors idea. It provides updated info on ceramic precursor applied sciences and their various functions, overlaying steel nitrides, carbides, phosphides and aresnides, in addition to sol-gel and inorganic polymer-processed steel oxides. the explicit constitution of complex fabrics is mentioned, and classical and ceramic-precursor equipment of ceramic training are lined.

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Active catalysts included platinum group metals attached to hydrophobic carbon, supported on a mixture of hydrophobic and hydrophilic materials. Only palladium catalysts supported on a hydrophobic component were found to be selective towards hydrogen peroxide formation. The ratio of hydrophobic-to-hydrophiliccatalyst properties was important in determining the H202 yield. The effects of metal particle size and surface area appeared not to be important in determining H,O, yield. A simple way of characterizing catalyst hydrophobicity is proposed.

1. Catalysts Palladium nitrate (Aldrich) dissolved in anhydrous methanol (Molincrockdt, AR) was used to prepare fluorinated carbon-supported catalysts and the solution of palladium nitrate in 5% HN0,-for impregnation of amorphous fumed silica Cab-0-Sil (Cabot, grade HS-5) and Silicalite S-115 (Union Carbide, Linde Division). Surface areas of the supports are given in Table 3. The palladium loading on the above supports, except for a few cases indicated in the text, was 5 wt%. Hydrophobic catalyst supports were prepared by fluorinating activated carbon to contain various amounts of fluorine.

In these representations the Lo phase contains most of the alkane and (in cases C and D) part of the solvent, whereas the La phase contains most of the H202 and H20, suspended TS-1 particles and (in cases C and D) the remaining part of the solvent. Fig. 1: Schematic representation of the reaction media for alkane oxygenation by aqueous H202 on TS-1 in the absence of solvent and without mechanical agitation (A); in the absence of solvent and with mechanical agitation (B); in the presence of solvent and without mechanical agitation (C); in the presence of solvent and with mechanical agitation (D).

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Ceramic precursor technology and its applications by Chaitanya K. Narula

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