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Effects of titanium silicalite and TiO 2 nanocomposites on supported Co‐based catalysts for Fischer–Tropsch synthesis
Author(s) -
Li Zhenhua,
Si Mengyao,
Li Xin,
Lv Jing
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4640
Subject(s) - catalysis , nanocomposite , chemistry , fischer–tropsch process , chemical engineering , cobalt , x ray photoelectron spectroscopy , desorption , titanium , adsorption , dispersion (optics) , inorganic chemistry , nuclear chemistry , selectivity , organic chemistry , physics , optics , engineering
Titanium silicalite (TS) and TiO 2 nanocomposites were prepared by mixing TS and TiO 2 with different ratios in ethanol. They were impregnated with 15 wt% Co loading to afford Co‐based catalysts. Fischer–Tropsch synthesis (FTS) performance of these TS–TiO 2 nanocomposite‐supported Co‐based catalysts was studied in a fixed‐bed tubular reactor. The results reveal that the Co/TS–TiO 2 catalysts have better catalytic performance than Co/TS or Co/TiO 2 each with a single support, showing the synergistic effect of the binary TS–TiO 2 support. Among the TS–TiO 2 nanocomposite‐supported Co‐based catalysts, Co/TS–TiO 2 ‐1 presents the highest activity. These catalysts were characterized using N 2 adsorption–desorption measurements, X‐ray diffraction, X‐ray photoelectron spectroscopy, H 2 temperature‐programmed reduction, H 2 temperature‐programmed desorption and transmission electron microscopy. It was found that the position of the active component has a significant effect on the catalytic activity. In the TS–TiO 2 nanocomposites, cobalt oxides located at the new pores developed between TS and TiO 2 can exhibit better catalytic activity. Also, a positive relationship is observed between Co dispersion and FTS catalytic performance for all catalysts. The catalytic activity is improved on increasing the dispersion of Co.