Nanoceria-Supported Single-Atom Platinum Catalysts for Direct Methane Conversion

作者：Xie, Pengfei; Pu, Tiancheng; Nie, Anmin; Hwang, Sooyeon; Purdy, Stephen C.; Yu, Wenjian; Su, Dong; Miller, Jeffrey T.; Wang, Chao^*

来源：ACS Catalysis, 2018, 8(5): 4044-4048.

DOI：10.1021/acscatal.8b00004

• single-atom catalysts
• direct methane conversion
• platinum
• ceria nanocrystals
• carbon coking

Nanoceria-supported atomic Pt catalysts (denoted as Pt-1@CeO2) have been synthesized and demonstrated with advanced catalytic performance for the nonoxidative, direct conversion of methane. These catalysts were synthesized by calcination of Pt-impregnated porous ceria nanoparticles at high temperature (ca. 1000 degrees C), with the atomic dispersion of Pt characterized by combining aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analyses. The Pt-1@CeO2 catalysts exhibited much superior catalytic performance to its nanoparticulated counterpart, achieving 14.4% of methane conversion at 975 C and 74.6% selectivity toward C-2 products (ethane, ethylene, and acetylene). Comparative studies of the Pt-1@CeO2 catalysts with different loadings as well as the nanoparticulated counterpart reveal the single-atom Pt to be the active sites for selective conversion of methane into C-2 hydrocarbons.

• 出版日期2018-5
• 单位上海大学