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【期刊论文】Selective synthesis of cis-2,6-dimethylpiperazine catalyzed by a Cu-Cr-Fe/γ-Al2O3 catalyst
陈立功, Guoyi
Applied Catalysis A: General 277 (2004) 253-258,-0001,():
-1年11月30日
A continuous process for the synthesis of cis-2,6-dimethylpiperazine was described in this paper. The cyclization of N-β-hydroxypropyl-1,2-propanediamine proceeded effectively over a Cu-Cr-Fe/γ-Al2O3 catalyst in a fixed-bed reactor. Cu0 and Cu+ were believed to be the active sites of the catalyst. Fe was found to play an important role on the catalyst activity and stability. Effects of solvents, temperature and hydrogen pressure were examined; solvents were found to be very important for this reaction. Remarkable differences were found between the catalysts used in water and those used in dioxane by the XPS and SEM characterizations. The loss of Fe and some carbon deposit on the catalyst surface were detected and supposed to be the main reasons of the catalyst deactivation in water, whereas the catalyst showed an excellent service life in dioxane. Finally, cis-2,6-dimethylpiperazine was obtained with a total yield of over 70% under the optimum reaction conditions. Thus, a highly selective process for the synthesis of cis-2,6-dimethylpiperazine was established here.
Cu-Cr-Fe/, g-Al2O3
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【期刊论文】Racemization of R-2-amino-1-butanol over Rh-doped Co/γ-Al2O3 catalyst
陈立功, Yuecheng
Journal of Catalysis 236 (2005) 176-180,-0001,():
-1年11月30日
The racemization of R-2-amino-1-butanol proceeded effectively over a Co–Rh/γ-Al2O3 catalyst in a fixed-bed reactor. The catalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction, and transmission electron microscopy. For these catalysts, Co0 was believed to be the active sites of the catalyst, and the presence of the optimum amount of rhodium led to highly dispersed active species. The activity, selectivity, and stability of the catalyst were demonstrated, and racemic 2-amino-1-butanol was obtained with a yield >82% under the optimum reaction conditions.
Racemization, Co–Rh/, γ-Al2O3 catalyst, Co/, γ-Al2O3 catalyst, R-2-amino-1-butanol, S-2-amino-1-butanol
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陈立功, Feng-Yan
Journal of Fluorescence, Vol. 15, No. 6, December 2005,-0001,():
-1年11月30日
A
Fluorescent
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