Citation: Ammar Muhammad, Cao Yan, He Peng, Wang Li-Guo, Chen Jia-Qiang, Li Hui-Quan. Zn-Co bimetallic supported ZSM-5 catalyst for phosgene-free synthesis of hexamethylene-1, 6-diisocyanate by thermal decomposition of hexamethylene-1, 6-dicarbamate[J]. Chinese Chemical Letters, ;2017, 28(7): 1583-1589. doi: 10.1016/j.cclet.2017.03.015 shu

Zn-Co bimetallic supported ZSM-5 catalyst for phosgene-free synthesis of hexamethylene-1, 6-diisocyanate by thermal decomposition of hexamethylene-1, 6-dicarbamate

Ammar Muhammad ^a,b ,
Cao Yan ^a,, ,
He Peng ^a ,
Wang Li-Guo ^a ,
Chen Jia-Qiang ^a ,
Li Hui-Quan ^a,,

a.
Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, CAS, Beijing 100190, China
b.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Cao Yan, ycao@ipe.ac.cn Li Hui-Quan, hqli@ipe.ac.cn
Received Date: 20 December 2016
Revised Date: 21 January 2017
Accepted Date: 9 March 2017
Available Online: 11 July 2017

Figures(6)

A set of mono-and bimetallic (Zn-Co) supported ZSM-5 catalysts was first prepared by PEG-additive method. The physicochemical properties of the catalysts were investigated by FTIR, XPS, XRD, N₂ adsorption-desorption measurements, SEM, EDS and NH₃-TPD techniques. The physicochemical properties showed that the ZnCo₂O₄ spinel oxide was formed on the ZSM-5 support and provided effectual synergetic effect between Zn and Co species for the bimetallic catalyst. Furthermore, bimetallic supported ZSM-5 catalyst exhibited weak, moderate and strong acidic sites, while the monometallic supported ZSM-5 catalyst showed only weak and moderate or strong acidic sites. Their catalytic performances for thermal decomposition of hexamethylene-1, 6-dicarbamate (HDC) to hexamethylene-1, 6-diisocyanate (HDI) were then studied. It was found that the bimetallic supported ZSM-5 catalysts, especially Zn-2Co/ZSM-5 catalyst showed excellent catalytic performance due to the good synergetic effect between Co and Zn species, which provided a suitable contribution of acidic sites. HDC conversion of 100% with HDI selectivity of 91.2% and by-products selectivity of 1.3% could be achieved within short reaction time of 2.5 h over Zn-2Co/ZSM-5 catalyst.
- Hexamethylene-1, 6-dicarbamate (HDC),
- Hexamethylene-1, 6-diisocyanate (HDI),
- Thermal decomposition,
- Bimetallic supported ZSM-5 catalyst,
- Synergetic effect
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