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CO2 Conversion into Light Olefins Using an InCeZrOX/H-ZSM-5-Si Bifunctional Catalyst

Posted on 2024-07-10 - 20:04
Carbon dioxide (CO2) conversion into light olefins (C2=–C4=) using green hydrogen is a desirable strategy to reduce CO2 emissions and obtain valuable chemicals. Although ZSM-5-based bifunctional catalysts exhibit unique characteristics that render them suitable for various processes, they are rarely used for CO2 conversion into C2=–C4=. Herein, an In0.9Ce1Zr4OX/H-ZSM-5-Si bifunctional catalyst composed of In0.9Ce1Zr4OX and tetraethyl orthosilicate (TEOS)-passivated H-ZSM-5-Si was prepared for CO2 conversion into light olefins. CO2 on In0.9Ce1Zr4OX/H-ZSM-5-Si exhibits a selectivity of 60.3% for C2=–C4=, 5.9% for CH4, and 17.2% for C5+ in hydrocarbons. The CO selectivity in the total products is 63.6%. The doping of In and Ce increases the concentration of surface oxygen vacancies, thereby enhancing the adsorption of CO2 and H2. The passivation of H-ZSM-5-Si by TEOS effectively reduces its acidity, promoting the generation of C2=–C4=.

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