Abstract
Ru–Re/γ-Al2O3 catalysts were prepared by the incipient wet co-impregnation method and characterized by ICP-AES, BET, H2-TPR, XRD, SEM, TEM and H2 chemisorption. Structure and chemisorption properties of these catalysts were compared with monometallic (Ru, Re) catalysts synthesized by using the same Ru(NO)(NO3)3 or RuCl3 and NH4ReO4 precursors. Results showed that Ru–Re/γ-Al2O3 catalysts consist primary of bimetallic nanoparticles with small sizes (<3 nm), while the larger particles were monometallic Re, especially for the bimetallic catalyst at the Ru/Re atomic ratio of 50:50. Chemisorption data revealed that Re modifies the interaction of hydrogen with ruthenium surface sites. In the chlorine-free Ru–Re catalysts, dispersion of ruthenium increased with the rise of the Re loading. The mean particle size decrease from 1.3 to 0.9 nm by change of the Ru/Re ratio from 90:10 to 50:50. Ruthenium particle size calculated from H2 uptake agreed well with XRD and TEM data. Ruthenium dispersion of the chlorine-containing bimetallic Ru–Re catalyst (Ru/Re = 75:25) was significantly lower and comparable with the Ru(Cl) catalyst. Also, the large discrepancies between the mean particle size obtained from H2 chemisorption (3.9 nm) and TEM (1.1 nm) were observed what is explained by the contamination of Ru surface by the Cl− ions.
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