期刊
MOLECULAR CATALYSIS
卷 486, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mcat.2020.110873
关键词
Metal phosphate; Hydrogenation; Nitrobenzene reduction; Reaction induction period; Reconstruction
资金
- National Natural Science Foundation of China [21908085, 21776129, 21706121]
- Natural Science Foundation of Jiangsu Province [BK20190961, BK20170995]
- General Program for University Natural Science Research of Jiangsu Province [16KJB530003]
- Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Herein, we report an excellent in-situ exsolution triggered hydrogenated catalyst F-Ni/Cu-P-RT started from bimetallic phosphate Ni/Cu-P-RT, affording an ultrafast catalytic hydrogenated rate (20 s even 5 s) in nitrophenol reduction. In the first catalytic cycle, we proved the enhanced catalytic reduction activity of bimetallic Ni/Cu-P-RT within 50 s compared to monometallic counterparts. The kinetics results revealed Ni/Cu-P-RT affords the reaction rate K of 2.85/4.23/6.6 min(-1) at 20, 30, and 40 degrees C with the activation energy 32 kJ/mol. Impressively, the involved reaction induction period is visibly observed and interpreted by reconstruction and evolution of active metal during the reaction, but was eliminated through integrating two metal Cu-Ni by regulation of electronic band energy of phosphate from 4.1-3.5 eV. The nascent Cu and Ni nanoparticles as reaction-preferred active species were in-situ exsolved partially after adding NaBH4, triggering the resulted higher active and stable F-Ni/Cu-P-RT(20 s, 14.1 min(-1)) in later multiple cycles.
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