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Untangling the cobalt promotion role for ruthenium in sodium borohydride dehydrogenation with multiwalled carbon nanotube‐supported binary ruthenium cobalt catalyst
Author(s) -
Avci Hansu Tulin,
Sahin Omer,
Çağlar Aykut,
Demir Kivrak Hilal
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6226
Subject(s) - nanomaterial based catalyst , sodium borohydride , catalysis , dehydrogenation , ruthenium , carbon nanotube , cobalt , materials science , activation energy , arrhenius equation , borohydride , chemical engineering , chemistry , inorganic chemistry , nanotechnology , organic chemistry , engineering
Summary In the present study, multiwalled carbon nanotube‐supported Ru (Ru/MWCNT) and RuCo (RuCo/MWCNT) nanocatalysts with 3 wt% Ru loading were synthesized via sodium borohydride (SBH) reduction method for the dehydrogenation of SBH (R SBH ) . These nanocatalysts were characterized with XRD, XPS, SEM–EDX, and TEM. Ru/MWCNT and Ru:Co/MWCNT catalysts with varying Ru:Co atomic ratios were prepared successfully, and electronic state of Ru:Co altered compared to Ru. R SBH activities of these Ru/MWCNT and RuCo/MWCNT were examined in alkaline environment. RuCo/MWCNT at 80:20 atomic ratio exhibits superior H 2 evolution. Further experiments were performed with RuCo/MWCNT at 80:20 atomic ratio to determine how NaOH concentration (C NaOH ), reaction temperature (T rxn ), SBH concentration (C SBH ), and amount of nanocatalyst (M c ) affect R SBH activities. Activation energy (Ea) was calculated using the Arrhenius equation. RuCo/MWCNT at 80:20 atomic ratio exhibits superior H 2 evolution activities compared to the literature values. Initial rate (IR) for this nanocatalyst was found as 123.9385 mL H 2 g −1 cat min −1 . As a result of these kinetic calculations, the Ea of the nanocatalysts was calculated as 35.978 kJ/mol. The degree of reaction (n) was found to be 0.53 by trial and error. RuCo/MWCNT at 80:20 atomic ratio is a promising nanocatalyst for R SBH .