Enhanced activity of CuO/ZnO catalyst on the decomposition of dimethylhexane-1,6-dicarbamate into dimethylhexane-1,6-diisocyanate
- Authors
- Kim, Jinsung; Jeong, Cheonwoo; Lee, Jae-Hong; Suh, Young-Woong
- Issue Date
- Jun-2018
- Publisher
- SPRINGER
- Keywords
- Carbamate decomposition; CuO/ZnO; Sequential precipitation; Coprecipitation
- Citation
- RESEARCH ON CHEMICAL INTERMEDIATES, v.44, no.6, pp.3787 - 3796
- Indexed
- SCIE
SCOPUS
- Journal Title
- RESEARCH ON CHEMICAL INTERMEDIATES
- Volume
- 44
- Number
- 6
- Start Page
- 3787
- End Page
- 3796
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/32949
- DOI
- 10.1007/s11164-018-3382-4
- ISSN
- 0922-6168
- Abstract
- To decompose dimethylhexane-1,6-dicarbamate (HDC) to hexamethylene diisocyanate (HDI), mixed CuO and ZnO catalysts with Cu/(Cu + Zn) ratio of 4 and 8% were prepared by coprecipitation (CP), sequential precipitation (SP) and incipient wetness impregnation (IW). The SP-derived CuO/ZnO catalysts showed higher HDC yields than those derived by CP and IW. The IW method produced CuO/ZnO catalysts consisting of larger CuO and ZnO particles compared to the two precipitation methods. The CP method led to substitution of Zn2+ by Cu2+ in the hydrozincite precursor phase, resulting in higher BET and Cu surface areas of CuO-ZnO catalysts due to intimate intergrowth of nano-sized particles. However, the inherent character of ZnO in the CP-derived catalysts was modified by interfacial contact between CuO and ZnO identified by UV-visible and Raman spectra. In contrast, the properties of CuO and ZnO, as well as the relatively large surface areas, were kept in the SP-derived catalysts owing to deposition of Cu precipitates to fully aged Zn precipitates. This is believed to be a benefit of the SP method for the reaction. Therefore, our preparation approach has great potential to be extended to various mixed oxide catalysts.
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