Synergistical Catalysis of TiO2 and SAPO-34 for Efficient Conversion of CO2 to C2H4

The excessive emission of carbon dioxide (CO₂) into the atmosphere has led to a significant global warming crisis. Utilizing bifunctional catalysts, which consist of bimetallic oxides and SAPO-34, for catalyzing the conversion of CO₂ to high-value-added ethylene (C₂H₄) can effectively mitigate this issue. However, this process also produces a substantial number of by-products. Additionally, the use of bimetallics or precious metals increases the catalyst costs. In this study, we propose an innovative synergistic approach by integrating SAPO-34 with TiO₂, enabling both efficient CO₂ capture and its catalytic conversion into C2 hydrocarbons. The system achieved a C₂H₄ yield of 20 μmol g^-1 with a selectivity of 63.5%. Comprehensive characterizations revealed that the 30% TiO₂/SAPO composite exhibited a higher concentration of oxygen vacancies and a greater percentage of Ti³⁺ species. Moreover, the confinement effect of SAPO-34 facilitated the C-C coupling and the formation of C₂H₄. This work exemplifies a dual-functional strategy, providing valuable insights for carbon reduction.