2 research outputs found
Highly efficient polyoxometalate-based catalysts for clean-gasoline synthesis
Poor selectivity for gasoline products is a critical issue for the Fischer-Tropsch synthesis (FTS). Herein, we report that the introduction of a polyoxometalate Cs2.5H0.5PW12O40 (CsPW) into a conventional FTS catalyst (Co/Al2O3) can create a highly efficient bifunctional catalyst, leading to 118% increase in the selectivity of gasoline. Furthermore, it was found that such a significant improvement is due to the effective hydrocracking of heavier hydrocarbon products at CsPW sites
Direct Production of Lower Olefins from CO<sub>2</sub> Conversion via Bifunctional Catalysis
Direct
conversion of carbon dioxide (CO<sub>2</sub>) into lower
olefins (C<sub>2</sub><sup>=</sup>–C<sub>4</sub><sup>=</sup>), generally referring to ethylene, propylene, and butylene, is highly
attractive as a sustainable production route for its great significance
in greenhouse gas control and fossil fuel substitution, but such a
route always tends to be low in selectivity toward olefins. Here we
present a bifunctional catalysis process that offers C<sub>2</sub><sup>=</sup>–C<sub>4</sub><sup>=</sup> selectivity as high
as 80% and C<sub>2</sub>–C<sub>4</sub> selectivity around 93%
at more than 35% CO<sub>2</sub> conversion. This is achieved by a
bifunctional catalyst composed of indium–zirconium composite
oxide and SAPO-34 zeolite, which is responsible for CO<sub>2</sub> activation and selective C–C coupling, respectively. We demonstrate
that both the precise control of oxygen vacancies on the oxide surface
and the integration manner of the components are crucial in the direct
production of lower olefins from CO<sub>2</sub> hydrogenation. No
obvious deactivation is observed over 150 h, indicating a promising
potential for industrial application