Abstract
High-entropy crystalline materials are attracting more attention. In principle, high-entropy metal carbides (HMCs) that contain five or more metal ions, possess more negative free energy value during catalysis. But its preparation is challenging because of the immiscibility of multi metal cations in a single carbide solid solution. Here, a rational strategy for preparing HMC is proposedviaa coordination-assisted crystallization process in the presence of Br-based poly(ionic liquids). Through this method, Mo0.2W0.2V0.2Cr0.2Nb0.2C nanoparticles, with a single cubic phase structure, incorporated on porous carbon, are obtained (HMC@NC). By combination of well dispersed small particle size (∼4 nm), high surface area (∼270 m2g−1), and high-entropy phase, HMC@NC can function as a promising catalyst for the dehydrogenation of ethylbenzene. Unexpected activity (EB conv.: 73%) and thermal stability (>100 h on steam) at 450 °C are observed. Such a facile synthetic strategy may inspire the fabrication of other types of HMCs for more specific tasks.
| Original language | English |
|---|---|
| Pages (from-to) | 3676-3679 |
| Number of pages | 4 |
| Journal | Chemical Communications |
| Volume | 57 |
| Issue number | 30 |
| DOIs | |
| State | Published - Apr 18 2021 |
Funding
The authors thank the National Natural Science Foundation of China (no. 21978115). S. D. and H. C. were supported by the Division of Chemical Sciences, Geosciences and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy. P. F. Z. acknowledges the National Natural Science Foundation of China (Grant No. 21776174), Shanghai Rising-Star Program (20QA1405200), Shanghai Jiao Tong University Scientific and Technological Innovation Funds (No. 2019QYB06), and the National Key R & D Plan (2020YFB0606400) for their support.