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Importance of Size and Distribution of Ni Nanoparticles for the Hydrodeoxygenation of Microalgae Oil
Author(s) -
Song Wenji,
Zhao Chen,
Lercher Johannes A.
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201301005
Subject(s) - hydrodeoxygenation , catalysis , zeolite , stearic acid , nickel , nanoparticle , precipitation , metal , chemical engineering , product distribution , chemistry , brønsted–lowry acid–base theory , selectivity , materials science , organic chemistry , nanotechnology , physics , meteorology , engineering
Improved synthetic approaches for preparing small‐sized Ni nanoparticles ( d =3 nm) supported on HBEA zeolite have been explored and compared with the traditional impregnation method. The formation of surface nickel silicate/aluminate involved in the two precipitation processes are inferred to lead to the stronger interaction between the metal and the support. The lower Brønsted acid concentrations of these two Ni/HBEA catalysts compared with the parent zeolite caused by the partial exchange of Brønsted acid sites by Ni 2+ cations do not influence the hydrodeoxygenation rates, but alter the product selectivity. Higher initial rates and higher stability have been achieved with these optimized catalysts for the hydrodeoxygenation of stearic acid and microalgae oil. Small metal particles facilitate high initial catalytic activity in the fresh sample and size uniformity ensures high catalyst stability.