TY - JOUR
T1 - Fischer-Tropsch Synthesis
T2 - Influence of Acid Treatment and Preparation Method on Carbon Nanotube Supported Ruthenium Catalysts
AU - Pendyala, Venkat Ramana Rao
AU - Jacobs, Gary
AU - Graham, Uschi M.
AU - Shafer, Wilson D.
AU - Martinelli, Michela
AU - Kong, Liang
AU - Davis, Burtron H.
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/6/7
Y1 - 2017/6/7
N2 - (Graph Presented) The influences of nitric acid treatment on a carbon nanotube (CNT) support and the preparation method, incipient wetness impregnation (IWI) versus chemical vapor deposition (CVD), on catalytic performance during Fischer-Tropsch (FT) synthesis were examined using a slurry phase reactor. Acid treated CNT (ACNT) supported Ru catalysts exhibited higher activities compared to Ru supported on untreated CNTs (UCNTs). The acid-treated CVD catalyst had higher initial CO conversion (smaller average Ru particle size) but sintered more due to a greater tendency for Ru to be deposited exterior to CNT channels relative to IWI. After the initial decline and leveling off period, the ACNT IWI catalyst had the highest steady activity among the catalysts tested. The ACNT IWI catalyst also displayed greater oxygenate selectivity (∼17%) compared to ACNT CVD (∼12%) and UCNT IWI (∼10%) catalysts at similar conversions. Acid treatment created adsorption sites on the CNT surface that anchor Ru precursors and promote CO insertion and/or OH addition leading to alcohols. Acid treatment also opened end-caps and broke tubes at defects, resulting in shorter diffusional path-lengths and allowing Ru to be deposited within CNT channels (especially for IWI).
AB - (Graph Presented) The influences of nitric acid treatment on a carbon nanotube (CNT) support and the preparation method, incipient wetness impregnation (IWI) versus chemical vapor deposition (CVD), on catalytic performance during Fischer-Tropsch (FT) synthesis were examined using a slurry phase reactor. Acid treated CNT (ACNT) supported Ru catalysts exhibited higher activities compared to Ru supported on untreated CNTs (UCNTs). The acid-treated CVD catalyst had higher initial CO conversion (smaller average Ru particle size) but sintered more due to a greater tendency for Ru to be deposited exterior to CNT channels relative to IWI. After the initial decline and leveling off period, the ACNT IWI catalyst had the highest steady activity among the catalysts tested. The ACNT IWI catalyst also displayed greater oxygenate selectivity (∼17%) compared to ACNT CVD (∼12%) and UCNT IWI (∼10%) catalysts at similar conversions. Acid treatment created adsorption sites on the CNT surface that anchor Ru precursors and promote CO insertion and/or OH addition leading to alcohols. Acid treatment also opened end-caps and broke tubes at defects, resulting in shorter diffusional path-lengths and allowing Ru to be deposited within CNT channels (especially for IWI).
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U2 - 10.1021/acs.iecr.7b00341
DO - 10.1021/acs.iecr.7b00341
M3 - Article
AN - SCOPUS:85021129366
SN - 0888-5885
VL - 56
SP - 6408
EP - 6418
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 22
ER -