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Highly Dispersed Pd Nanoparticles Supported on Zr-Doped MgAl Mixed Metal Oxides for 2-Ethylanthraquinone Hydrogenation
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Highly Dispersed Pd Nanoparticles Supported on Zr-Doped MgAl Mixed Metal Oxides for 2-Ethylanthraquinone Hydrogenation
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Journal Article
Highly Dispersed Pd Nanoparticles Supported on Zr-Doped MgAl Mixed Metal Oxides for 2-Ethylanthraquinone Hydrogenation
2019
Overview
In this study, Pd-Mg(Al)-LDH/γ-Al
2
O
3
and Pd-Mg(Al)Zr-LDH/γ-Al
2
O
3
precursors were synthesized by impregnating Na
2
PdCl
4
on Mg(Al)-LDH/γ-Al
2
O
3
and Mg(Al)Zr-LDH/γ-Al
2
O
3
, and then the precursors were calcinated and reduced to obtain Pd-Mg(Al)-MMO/γ-Al
2
O
3
and Pd-Mg(Al)Zr-MMO/γ-Al
2
O
3
catalysts. Compared with Pd/γ-Al
2
O
3
catalyst, the hydrogenation efficiency of Pd-Mg(Al)-MMO/γ-Al
2
O
3
and Pd-Mg(Al)Zr-MMO/γ-Al
2
O
3
increased by 15.7% and 24.0%, respectively. Moreover, the stability of Pd-Mg(Al)Zr-MMO/γ-Al
2
O
3
catalyst was also higher than that of Pd/γ-Al
2
O
3
. After four runs, the hydrogenation efficiency of Pd/γ-Al
2
O
3
decreased from 12.1 to 10.0 g/L, while that of Pd-Mg(Al)Zr-MMO/γ-Al
2
O
3
decreased from 15.0 to 14.3 g/L. The active aquinones selectivities of all catalysts were almost 99%. The structures of the catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N
2
adsorption–desorption, inductively coupled plasma-atomic emission spectrometry (ICP-AES), CO chemisorption analysis, transmission electron microscopy (TEM), temperature-programmed reduction with hydrogen (H
2
-TPR), and X-ray photoelectron spectroscopy (XPS). The results indicate that the improved catalytic performance is attributed to the stronger interaction between Pd and Mg(Al)Zr-MMO/γ-Al
2
O
3
, smaller Pd particle size and higher Pd dispersion. This work develops an effective method to synthesize highly dispersed Pd nanoparticles based on the layered double hydroxides (LDHs) precursor.
Publisher
Tianjin University,Springer Nature B.V,School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China%School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China,School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China
