S. Qi
2011
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Journal
Chinese Journal of Catalysis
Abstract
Vapor-phase catalytic synthesis of 1-phenylazepane from aniline and 1,6-hexanediol over CoO/SiO2-Al2O3 catalyst was inves-tigated and the catalyst samples were characterized by N2 adsorption-desorption,X-ray diffraction,H2 temperature-programmed reduction,and NH3 temperature-programmed desorption.The results indicated that the CoO/SiO2-Al2O3 catalyst showed higher activity and selectivity.When CoO loading was 0.3 mmol/g and the catalyst precursor was calcined at 700 °C(2.8 °C/min) for 4 h followed by reduction in situ at 325 °C for 2 h in the mixture gas of 50% H2-50% N2(60 ml/min) before reaction,the yield of 1-phenylazepane could be up to 80%.The catalyst with larger specific surface area,higher dispersion of the active component,and weaker acidity favored the synthesis of the target product.