Direct Synthesis of Dimethyl Ether from CO2 Hydrogenation over Core-Shell Nanotube Bi-Functional Catalyst

Directly synthesising dimethyl ether (DME) from CO2 hydrogenation is a promising technique for efficiently utilising as feedstock to produce clean fuel. The main challenges in this process are the low conversion and DME selectivity of catalyst its deactivation over time due sintering, aggregation, coke formation, water adsorption. This study aimed develop dual-functional, halloysite nanotube-supported CuZnO-PTA with core-shell structure investigate effects active site mass ratio CuZnO/PTA on selectivity. A dual-functional mesopores nanotube (HNT) was developed, both sites were co-hosted one support. co-impregnation method used synthesise CuZnO 12-phosphotungstic acids (PTA) that then supported by mesoporous (HNT). BET surface area, N2 physisorption, FE-SEM, SEM, XRD, H2-TPR, NH3-TPD characterised physio-chemical properties prepared hybrid catalyst. experimental results showed synthesised CuZn-PTA@HNT bifunctional promising; almost same all four catalysts, an average 22.17%, while reached 68.9%. Furthermore, effect studied, metal Cu wt% loading not significant. In contrast, PTA acid positively affected selectivity; they also excellent tolerance towards generated methanol dehydration reaction. addition, temperature reusability CZ-PTA@HNT has been investigated, show increasing improves but decreases less than 305 °C good compromise between selectivity, stability continuous activity/stability five consecutive cycles. conclusion, presents novel approach using directly which exhibits terms