Role of ZrO₂ in Cu/ZnO/ZrO₂ catalysts prepared from the precipitated Cu/Zn/Zr precursors
- Authors
- Jeong, Cheonwoo; Suh, Young-Woong
- Issue Date
- May-2016
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Cu/ZnO/ZrO2; Precursor structure; Amorphous zirconia; Specific copper surface area; Support
- Citation
- CATALYSIS TODAY, v.265, pp.254 - 263
- Indexed
- SCIE
SCOPUS
- Journal Title
- CATALYSIS TODAY
- Volume
- 265
- Start Page
- 254
- End Page
- 263
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/154671
- DOI
- 10.1016/j.cattod.2015.07.053
- ISSN
- 0920-5861
- Abstract
- In Cu/Zn/Zr precursors prepared by coprecipitation, Zr ions showed no effect on a substitution level of Cu2+ by Zn2+ in the zincian malachite (zM) and were not incorporated into zM lattice upon precipitation and subsequent ageing. As hydroxyl-rich Zr aggregates were precipitated independent of mixed Cu/Zn precipitates, they served as a barrier to formation of larger Cu/Zn particles during precipitation and transformation into Cu/Zn needles during ageing. After calcination of Cu/Zn/Zr precursors with higher Zr contents, smaller CuO/ZnO particles were produced in between which amorphous ZrO2 was situated. Upon reduction of CuO/ZnO/ZrO2 with more Zr, this type of ZrO2 resulted in formation of smaller Cu-0 particles yielding the higher Cu dispersion. However, the specific copper surface area and catalytic activity of the reduced Cu/ZnO/ZrO2 exhibited a volcano-type relationship with the Zr/( Cu + Zn) ratio. This could be a combined result between the lower amount of total Cu and the higher Cu dispersion.
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