<sup>129</sup>Xe NMR Analysis of Mo/Al<sub>2</sub>O<sub>3</sub> Hydrodesulfurization Catalyst

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  • <sup>129</sup>Xe NMRによるMo/Al<sub>2</sub>O<sub>3</sub>脱硫触媒の解析
  • 129Xe NMRによるMo/Al2O3脱硫触媒の解析
  • 129XeNMR ニ ヨル Mo Al2O3 ダツリュウショクバイ ノ カイセキ

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Abstract

129Xe NMR (nuclear magnetic resonance), a useful analytical tool for the investigation of zeolite pores, was evaluated as a novel technique for the analysis of active sites on Mo/Al2O3 hydrodesulfurization catalyst. 129Xe NMR spectroscopy of Mo/Al2O3 catalyst detected a single peak attributed to xenon migrating in a few micropores on the surface of Al2O3. When a chemical shift δ of the peak was plotted against the amount of adsorbed xenon N in the NMR measurement, a nonlinear variation of δ appeared for sulfided Mo/Al2O3 catalyst. This result indicates that xenon strongly interacts electronically with molybdenum species on the surface. In addition, the term δ0 was calculated which mainly depends on collisions between xenon and the catalyst surface from the fitting of the plot to a theoretical equation. As a result, δ0 became larger with increased the molybdenum content. This result shows that migration of xenon was inhibited by molybdenum species on the surface. Increase in the sulfurization temperature also caused δ0 to increase and almost corresponded to the sulfurization degree of molybdenum measured by XPS (X-ray photoelectron spectroscopy). This indicates that δ0 is sensitive to formation of MoS2 crystallites on the surface. 129Xe NMR can be a powerful tool for analysis of the formation of MoS2 crystallites on Mo/Al2O3 catalyst.<br>

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