새글 논문 해외 국제전문학술지(SCI급) (공동) Ultrasmall Ni Nanoclusters on Perovskites: Highly Stable and Coke-Resistant Catalysts for Methane Reforming with CO2
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2026-01
- 저자명 Sung-Bin Choi, Su-Ji Kim, Jinjong Kim, Han Bin Park, Gwan-Joong Park, Da-Bin Kang, Jeong-Chul Kim, Sang Hoon Joo*, Ja Hun Kwak*, Chang Hyun Ko*
- 학술지명 ACS Applied Materials & Interfaces
- 발행처명 American Chemical Society
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 10
- 원문 링크 https://pubs.acs.org/doi/abs/10.1021/acsami.5c25510
홈페이지논문 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.