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Plasma Assisted Preparation of CoPt/SiO 2 Fischer‐Tropsch Catalysts: A Comparison of the Precursor Pre‐Thermal Treated Temperatures
Author(s) -
Liu Chen,
Liu Hao,
Wang Bo,
Hong Jingping,
Zhao Fuzhen,
Sun Fenglou,
Jin Shiwei,
Liu Chengchao,
Zhang Yuhua,
Li Jinlin
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.201800669
Subject(s) - cobalt , fischer–tropsch process , catalysis , dispersion (optics) , thermal decomposition , particle size , chemistry , incipient wetness impregnation , nitrate , inorganic chemistry , materials science , chemical engineering , selectivity , organic chemistry , physics , optics , engineering
A series of amorphous silica supported Co‐based catalysts were prepared using traditional incipient wetness impregnation methods followed by thermal treatment at different temperatures. Glow discharge plasma effects on cobalt species in the forms of cobalt nitrate, mixture of cobalt nitrate and Co 3 O 4 , and pure Co 3 O 4 were compared and investigated by various characterizations and Fischer‐Tropsch synthesis (FTS) tests. Plasma enhancing metal dispersion effect was mostly happened during the decomposition of cobalt nitrate in plasma field; when cobalt species was already in the form of Co 3 O 4 , no apparent particle size change by plasma treatment was observed. Under the promotion of Pt, all the catalysts maintained at high reduction degree, thus the cobalt dispersion was almost linearly related to the number of active sites. The CoSi‐100D+P catalyst with both high cobalt dispersion and high cobalt reducibility, had the maximum number of active sites, and presented the highest FTS activity. Meanwhile, the product selectivity could also be affected by plasma treatment, hydrocarbons were shifted to lower carbon numbers. This effect could be observed even on the CoSi‐400C+P sample, in which the precursor was pre‐thermal treated at high temperature (400 °C), and cobalt species was already all transformed into Co 3 O 4 .