Zn promoted GaZrO Ternary Solid Solution Oxide Combined with SAPO-34 Effectively Converts CO to Light Olefins with Low CO Selectivity.

We proposed a new strategy for CO hydrogenation to prepare light olefins by introducing Zn into GaZrO to construct ZnGaZrO ternary oxides, which was combined with SAPO-34 to prepare a high-performance ZnGaZrO/SAPO-34 tandem catalyst for CO hydrogenation to light olefins. By optimizing the Zn doping content, the ratio and mode of the two-phase composite, and the process conditions, the 3.5 %ZnGaZrO/SAPO-34 tandem catalyst showed excellent catalytic performance and good high-temperature inhibition of the reverse water-gas shift (RWGS) reaction. The catalyst achieved 26.6 % CO conversion, 82.1 % C -C selectivity and 11.8 % light olefins yield. The ZnGaZrO formed by introducing an appropriate amount of Zn into GaZrO significantly enhanced the spillover H effect and also induced the generation of abundant oxygen vacancies to effectively promote the activation of CO. Importantly, the RWGS reaction was also significantly suppressed at high temperatures, with the CO selectivity being only 46.1 % at 390 °C.