An efficient green route for hexamethylene-1,6-diisocyanate synthesis by thermal decomposition of hexamethylene-1,6-dicarbamate over Co3O4/ZSM-5 catalyst: An indirect utilization of CO2

A phosgene-free green route was developed for the thermal decomposition of HDC to HDI over Co3O4/ZSM-5 catalyst. The catalytic performance of Co3O4/ZSM-5 catalyst was depended on its relative surface content of Co3 +, surface lattice oxygen content and total acidity.60