期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 51, 页码 19969-19972出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b09856
关键词
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资金
- Center for Emergent Materials: an NSF MRSEC [DMR-1420451]
- Camille and Henry Dreyfus Foundation
Inexpensive, transition metal-free intermetallic compounds have received almost no attention as heterogeneous catalysts. Here, we show that BaGa2, a Zintl-Klemm compound composed of honeycomb sheets of Ga- anions separated by Ba2+ cations and known to react with H-2 under moderate conditions to form a layered polyanionic hydride BaGa2H2, effectively catalyzes the hydrogenation of phenylacetylene into styrene and ethylbenzene under modest conditions (1-50 bar H-2, 40-100 degrees C). Remarkably, the catalytic activity of BaGa2 (surface specific activities up to 8390 h(-1)) is on the same order of magnitude as commercial Pd-based catalysts. In contrast, BaGa2H2 shows negligible catalytic activity, thereby indicating that the unsaturated Ga- framework is necessary for phenylacetylene and styrene adsorption. These findings open up future explorations of utilizing and optimizing the long-term stability of transition metal-free intermetallic hydrogen absorbing compounds for hydrogen-based catalysis.
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