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Fabrication of supported Pd–Ir/Al 2 O 3 bimetallic catalysts for 2‐ethylanthraquinone hydrogenation
Author(s) -
Hong Runrun,
He Yufei,
Feng Junting,
Li Dianqing
Publication year - 2017
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15748
Subject(s) - bimetallic strip , catalysis , calcination , yield (engineering) , metal , chemistry , hydrogen peroxide , rhodium , particle size , inorganic chemistry , transition metal , nuclear chemistry , materials science , metallurgy , organic chemistry
A series of χ wt % Pd‐(1‐χ) wt % Ir (χ = 0.75, 0.50, and 0.25) catalysts supported on γ‐Al 2 O 3 have been prepared by co‐impregnation and calcination‐reduction, and subsequently employed in the hydrogenation of 2‐ethylanthraquinone—a key step in the manufacture of hydrogen peroxide. Detailed studies showed that the size and structure of the bimetallic Pd–Ir particles vary as a function of Pd/Ir ratio. By virtue of its small metal particle size and the strong interaction between Pd and Ir, the 0.75 wt % Pd–0.25 wt % Ir/Al 2 O 3 catalyst afforded the highest yield of H 2 O 2 , some 25.4% higher than that obtained with the monometallic 1 wt % Pd catalyst. Moreover, the concentration of the undesired byproduct 2‐ethyl‐5,6,7,8‐tetrahydroanthraquinone (H 4 eAQ) formed using the Pd–Ir bimetallic catalysts was much lower than that observed with the pure Pd catalyst, which can be assigned to the geometric and electronic effects caused by the introduction of Ir. © 2017 American Institute of Chemical Engineers AIChE J , 63: 3955–3965, 2017