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Effect of Preparation Solvent and Calcination Atmosphere on Ni@SiO 2 Catalyst for Simultaneous Production of Hydrogen and Carbon Nanotubes from Simulated Plastic Waste Syngas
Author(s) -
Li Wei-Jing,
Kuo Jia-Hong,
Yang Ren-Xuan,
Wey Ming-Yen
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201800586
Subject(s) - calcination , catalysis , materials science , dispersion (optics) , chemical engineering , syngas , carbon nanotube , yield (engineering) , solvent , hydrogen , carbon fibers , hydrogen production , inorganic chemistry , nanotechnology , chemistry , organic chemistry , metallurgy , composite number , composite material , physics , engineering , optics
SiO 2 core supports are prepared via the Stöber method with various synthesizing solvents. Then, a Ni shell is deposited on SiO 2 by a deposition–precipitation method. The results illustrate that using isopropanol as the solvent governs the catalyst particle size with a superior dispersion and a high catalytic activity. Thus, the calcination atmosphere of the catalyst directly affects both the chemical state and the catalytic performance of the active sites. The Ni@SiO 2 ‐I‐air (isopropanol) catalyst calcined by air with more Ni 2+ facilitates the highest H 2 production of 142.2 mmol g −1 h −1 but provides a carbon nanotube (CNT) yield of only 7.6%. Most importantly, the Ni@SiO 2 ‐I‐H 2 catalyst calcined by ambient H 2 is prone to form Ni 0 species, thus providing the best crystalline conversion and metal–support interaction, which benefits the production of CNTs to a maximum yield of 19.8% with a H 2 production of 122.8 mmol g −1 h −1 .