Heteropolyacid Incorporated Bifunctional Core-Shell Catalysts for Dimethyl Ether Synthesis from Carbon Dioxide/Syngas

Core-shell-type catalysts, which are synthesized by encapsulating the Cu-ZnO-Alumina type methanol synthesis catalyst (CZA) silicotungstic acid (STA)-incorporated mesoporous alumina, were prepared following a hydrothermal route and tested in DME from syngas CO2. Activity tests, performed pressure range of 30–50 bar, temperature 200–300 °C, with different feed compositions (CO2/CO/H2: 50/-/50, 40/10/50, 25/25/50, 10/40/50) showed that best-operating conditions for highest yield 275 °C 50 bar. Results proved presence CO2 had positive effect on yield. The total conversion CO + increased an increase CO2/CO ratio. An overall selectivity values obtained as 65.6% 73.2%, respectively, composition H2/CO2/CO = 50/40/10. Synthesis using CZA CO2-containing gas mixtures was also investigated, 32.0% 83.6%, 50/40/10 mixture. new STA incorporated core-shell-type bifunctional catalysts highly promising to DME.