콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Ultrasmall Ni Nanoclusters on Perovskites: Highly Stable and Coke-Resistant Catalysts for Methane Reforming with CO2
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2026-01
- 저자명 Choi, S.-B., Kim, S.-J., Kim, J., Park, H. B., Park, G.-J., Kang, D.-B., Kim, J.-C., Joo, S. H.,* Kwak, J. H.,* and Ko, C. H.*
- 학술지명 ACS Applied Materials & Interfaces
- 발행처명 ACS
- 발행국가 해외
- 논문언어 외국어
- 논문 다운로드 링크(외부) https://pubs.acs.org/doi/10.1021/acsami.5c25510
논문 초록 (Abstract)
Catalytic dry reforming of methane (DRM) offers a sustainable route for converting greenhouse gases (CH4 and CO2) into syngas, yet suffers from rapid catalyst deactivation due to coke formation. Here, we report a rational approach to control Ni nanostructure and interface properties by tuning the reduction temperature of Ni-substituted La2Ti2O7 perovskite catalysts. Catalysts reduced at 800 °C formed ultrasmall, fully exposed Ni nanoclusters with a Ni−Ni coordination number of ∼3. These clusters were strongly anchored to oxygen-deficient perovskite surfaces, enabling efficient CH4 activation while suppressing carbon accumulation. In contrast, high-temperature (900 °C) reduction induced Ni sintering, loss of surface reactivity, and increased coke formation, whereas low-temperature (600 and 700 °C)-reduced catalysts exhibited negligible activity. Mechanistic studies using CO adsorption FT-IR, CO2-TPD, in situ DRIFTS, and XPS revealed that DRM over the highly active catalyst proceeds via a cooperative mechanism, in which CH4 activation occurs at Ni sites while CO2 is primarily activated on the La2Ti2O7 support.
