CHARACTERIZATION OF COPPER-ZINC HYDROXYCARBONATE PRECURSORS

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22320%2F19%3A43918192" target="_blank" >RIV/60461373:22320/19:43918192 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22350/19:43918192 RIV/61989100:27710/19:10243261

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

CHARACTERIZATION OF COPPER-ZINC HYDROXYCARBONATE PRECURSORS

Popis výsledku v původním jazyce

Previously, it was found that the structure of CuZn catalyst&apos;s precursor highly affected the catalyst properties1 and activity in ester hydrogenolysis2. To enhance the properties of CuZn catalysts, it is essential to describe the effect of single-phase hydroxycarbonate precursor on catalyst properties. Three CuZn catalysts were prepared by co-precipitation targeting Cu/Zn ratio equal to 0.66, 5.0 and 1.60 to get pure aurichalcite Cu2Zn3(CO3)2(OH)6, zincian malachite (Cu0.8Zn0.2)2(OH)2CO3 and an equal mix of both phases, respectively. As-prepared catalysts were calcined at temperatures in a range of 300-450 °C. The properties of as-prepared and calcined catalysts were characterized using in situ XRD, TPR and BET methods. XRD showed that CuO crystallite size in catalysts derived from different phases was similar in a range of 3 to 8 nm depending only on the calcination temperature. However, aurichalcite-derived catalyst crystallites were more resistant to high reduction temperature. On the other hand, aurichalcite-derived catalysts had lower BET surface area and larger pore size compared to other two catalysts. Despite potential disadvantages in structural properties, aurichalcite-derived catalysts performed as highly active in ester hydrogenolysis.

Název v anglickém jazyce

CHARACTERIZATION OF COPPER-ZINC HYDROXYCARBONATE PRECURSORS

Popis výsledku anglicky

Previously, it was found that the structure of CuZn catalyst&apos;s precursor highly affected the catalyst properties1 and activity in ester hydrogenolysis2. To enhance the properties of CuZn catalysts, it is essential to describe the effect of single-phase hydroxycarbonate precursor on catalyst properties. Three CuZn catalysts were prepared by co-precipitation targeting Cu/Zn ratio equal to 0.66, 5.0 and 1.60 to get pure aurichalcite Cu2Zn3(CO3)2(OH)6, zincian malachite (Cu0.8Zn0.2)2(OH)2CO3 and an equal mix of both phases, respectively. As-prepared catalysts were calcined at temperatures in a range of 300-450 °C. The properties of as-prepared and calcined catalysts were characterized using in situ XRD, TPR and BET methods. XRD showed that CuO crystallite size in catalysts derived from different phases was similar in a range of 3 to 8 nm depending only on the calcination temperature. However, aurichalcite-derived catalyst crystallites were more resistant to high reduction temperature. On the other hand, aurichalcite-derived catalysts had lower BET surface area and larger pore size compared to other two catalysts. Despite potential disadvantages in structural properties, aurichalcite-derived catalysts performed as highly active in ester hydrogenolysis.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

<a href="/cs/project/GA17-05704S" target="_blank" >GA17-05704S: Studium a optimalizace promotovaných CuZnAl hydrogenačních katalyzátorů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů