期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 106, 期 9, 页码 5248-5257出版社
WILEY
DOI: 10.1111/jace.19177
关键词
acid-leaching; crystallization; CuO; glass-ceramics; porous anatase
In this study, frits with a molar ratio of MgO:TiO2:P2O5 = 20:32:24 were prepared by melt water-quenching method, with the addition of various amounts of CuO. The frits were then heat- and acid-treated to form porous anatase consisting of nanosheets. The presence of CuO increased the crystallization of anatase and even led to the crystallization of CuO nano-rods, greatly accelerating the selective dissolution of the crystallized samples during acid-leaching process.
As an attempt to facilitate the mass production of porous anatase catalysts in industry, in this work, frits with molar ratios of MgO:TiO2:P2O5 = 20:32:24 and an extra addition of CuO (0, 8, 16, and 24 mol%) were first prepared by melt water-quenching method. The frits were further heat- and acid-treated, forming porous anatase consisting of nanosheets. The study showed that the CuO-containing samples had increasing crystallization of anatase and even the crystallization of CuO nano-rods. The easy dissolution of CuO nano-rods and the abundant grain boundaries in the heat-treated samples provided path for the acid-leaching and greatly accelerated the selective dissolution of the crystallized samples, reducing the acid-leaching time from 48 h for the CuO-free sample to 3 h for the sample containing 24 mol% CuO to form a similar porous structure. The preformed anatase acted as nucleus to induce the in situ growth of anatase nanosheets. As a result, CuO greatly fastened the formation of porous anatase, making the industrial production of porous anatase possible.
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