XAS study of Ni₂P/MCM-41 prepared by hydrogen plasma reduction
2013
Sun, Zhichao | Li, Xiang | Wang, Anjie | Wang, Yao | Chen, Yongying | Hu, Yongkang
Two Ni₂P hydrodesulfurization (HDS) catalysts supported over siliceous MCM-41 were prepared by the conventional temperature-programmed reduction method (Ni₂P-TPR) and a novel hydrogen plasma reduction method (Ni₂P-PR). They were characterized by XRD and XAS. Their catalytic performances were evaluated by HDS of dibenzothiophene. The results indicated that a well dispersed Ni₂P phase with crystal structure close to the standard was obtained by the hydrogen plasma reduction. For the catalyst prepared by the temperature-programmed reduction method, extra phosphorus was found in the lattice of Ni₂P phase, leading to the lattice distortion, the increase in the NiP coordination number, and the decrease in the NiNi coordination number with lengthening of its bond distance. Ni in Ni₂P-TPR was more electron deficient than that in Ni₂P-PR, probably due to the electronic interaction between Ni and the extra P present in Ni₂P-TPR. Consequently, Ni₂P-TPR showed higher hydrogenation selectivity than Ni₂P-PR.
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