In situ growth of embedded pt nanoparticles in MIL-68（In）-derived In2O3 for enhanced CO2 hydrogenation to methanol
Yanmei Cai , Kok Bing Tan , Meihong Lin , Shuhan Luo , Kaishu Wu , Sajid Ali , Guifen Du , Lanping Huang , Jianbang Liu , Dongren Cai , Guowu Zhan
The catalytic conversion of CO2 into methanol represents a promising route for reducing anthropogenic carbon emissions. Although Pt/In2O3 is an effective catalystfor this reaction, it suffers from severe sintering of both the Pt nanoparticles and the In2O3 support at high temperatures, leading to particle growth and deactivation. Herein, we report an in situ growth and embedding strategy using MIL-68(In) nanorods as a precursor to confine Pt nanoparticles within the derived In2O3 matrix. The resulting Pt/In2O3 catalyst exhibits ultrasmall In2O3 crystallites (11.8 nm) and a high surface area (48.3 m2∙g−1). Comprehensive spectroscopic and microscopic analyses reveal strong Pt-O-In electronic interactions, which generate a high density of surface oxygen vacancies (41%) while minimizing the number of exposed Pt sites. These structural and electronic features synergistically enhance CO2 activation and H2 dissociation, reducing the apparent activation energy required for methanol formation to 62.2 kJ∙mol−1. Under industrially relevant conditions (3 MPa, 300°C, 12,000 mL∙gcat−1∙h−1), the optimized catalyst achieves a CO2 conversion of 10.6% and a methanol production rate of 0.22 gMeOH∙gcat−1∙h−1, with exceptional stability over 180 h, outperforming previously reported Pt/In2O3 catalysts. This study offers a versatile metal-organic framework-mediated confinement strategy for designing durable high-performance metal/oxide catalysts for CO2 hydrogenation.
embedded Pt / in situ growth / CO2 hydrogenation / Pt/In2O3 / methanol
Higher Education Press 2026
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