| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 42645 | Applied Catalysis A: General | 2009 | 7 Pages |
Thin films of paramelaconite, tenorite and their mixtures were deposited on fiberglass substrate by chemical vapor deposition and catalytically evaluated by isopropanol oxidation at low temperatures between 150 and 275 °C. Copper oxides were deposited using bis(2,4-pentanedionato)copper(II) as a precursor and oxygen as carrier-reactant gas. Original crystalline phases deposited on fiberglass at different temperatures or formed subsequently were characterized by several analytical techniques. Films gave crystallite sizes from 6.5 to 8.4 nm and a thickness around 230 nm. The fiberglass with a paramelaconite film showed a relatively high catalytic activity, more than 40%, at 250 °C. Nevertheless, the fiberglass with a tenorite film exhibited a catalytic activity of only 10% at the same temperature. Above 250 °C the paramelaconite experienced a notable deactivation after which the catalytic activity decreased to 6.7% at 350 °C and after this, the catalyst could not be reused. This activity loss was probably due to changes in the chemical phases on fiberglass by effect of temperatures above 250 °C.
Graphical abstractFilms of paramelaconite were deposited on fiberglass by CVD and evaluated by isopropanol oxidation at low temperatures. Films gave crystallite sizes from 6.5 to 8.4 nm and a thickness around 230 nm. Paramelaconite films showed a catalytic activity of 42% at 250 °C. Nevertheless, above this temperature the paramelaconite experienced a notable deactivation. This activity loss was due to changes in the chemical phases of copper by effect of higher temperatures.Figure optionsDownload full-size imageDownload as PowerPoint slide
