Design and Synthesis of Bioinspired ZnZrO x &Bio-ZSM-5 Integrated Nanocatalysts to Boost CO2 Hydrogenation to Light Olefins

Transformation of CO2 with the help of green hydrogen (prepared from renewable energy) into valuable light olefins (C2 =–C4 =) is a promising route for utilizing the carbon resource in CO2. Currently, most of the reported bifunctional catalysts for CO2 hydrogenation to light olefins follow a methanol-mediated route that adopts SAPO-34 as the zeolite component. Although ZSM-5 has been widely used in the methanol to propylene process using fixed bed reactors due to high shape-selective property and long lifetime, ZSM-5-based bifunctional catalysts have seldomly been used for CO2 hydrogenation to light olefins. Herein, we proposed a novel synthetic strategy for bio-ZSM-5 with mild acid strength and relatively low acid density using the natural rice husk as a template. The bio-ZSM-5 was integrated with ZnZrO x solid solution nanoparticles, and the derived ZnZrO x &bio-ZSM-5 catalysts exhibited a high C2 =–C4 = selectivity of 64.4% and total C2–C4 selectivity of 94.5%, but relatively low CH4 selectivity (5.5%) and aromatic selectivity (