Although many researchers have reported CO2 hydrogenation to various C1 chemicals, it is still challenging to directly and selectively convert CO2 to C2-C4 hydrocarbons in terms of overcoming the extreme inertness of CO2 and a high C-C coupling barrier. In the present work, we report an efficient integration of methanol-synthesis and the methanol-to-hydrocarbons with the bifunctional catalyst component of In2O3-ZrO2 and SAPO-5. These tandem reactions exhibit an excellent relative selectivity of C2-C4 (83%) with a suppressed CH4 relative selectivity less than 3% at T = 300 °C. A detailed analysis indicates that the partially reduced indium oxide surface (In2O3-ZrO2) can better activate CO2 and promote the synthesis of methanol than In2O3 alone, and C-C coupling is subsequently manipulated within the confined acidic pores of SAPO-5 according to XRD, H2-TPR, CO2-TPD, SEM and TEM. Furthermore, the proximity of two components and the content of Si also play an important role in such outstanding selectivity to C2-C4. Our study paves a new path for the direct synthesis of lower hydrocarbons.
All Science Journal Classification (ASJC) codes
- Chemical Engineering (miscellaneous)
- Waste Management and Disposal
- Process Chemistry and Technology