A highly selective and stable ZnO-ZrO2 solid solution catalyst for CO2 hydrogenation to methanol
A highly selective and stable ZnO-ZrO2 solid solution catalyst for CO2 hydrogenation to methanol
Jijie Wang,Guanna Li,6 Authors,Can Li
TLDR
Experimental and theoretical results indicate that the synergetic effect between Zn and Zr sites results in the excellent performance of the ZnO-ZrO2 solid solution catalyst, which can achieve methanol selectivity of up to 86 to 91% with CO2 single-pass conversion of more than 10% under reaction conditions.
Abstract
Reduction of CO2 to methanol using renewable hydrogen is a promising but challenging strategy for carbon capture and utilization. Although methanol synthesis via CO hydrogenation has been industrialized, CO2 hydrogenation to methanol still confronts great obstacles of low methanol selectivity and poor stability, particularly for supported metal catalysts under industrial conditions. We report a binary metal oxide, ZnO-ZrO2 solid solution catalyst, which can achieve methanol selectivity of up to 86 to 91% with CO2 single-pass conversion of more than 10% under reaction conditions of 5.0 MPa, 24,000 ml/(g hour), H2/CO2 = 3:1 to 4:1, 320° to 315°C. Experimental and theoretical results indicate that the synergetic effect between Zn and Zr sites results in the excellent performance. The ZnO-ZrO2 solid solution catalyst shows high stability for at least 500 hours on stream and is also resistant to sintering at higher temperatures. Moreover, no deactivation is observed in the presence of 50 ppm SO2 or H2S in the reaction stream.