Experimental and kinetic study of n-heptane isomerization on nanoporous Pt-(Re,Sn)/HZSM5-HMS catalysts

Pt-（Sn,Re）/HZSM5-HMS catalysts were evaluated for n-heptane isomerization at 200–350 ℃.To characterize the catalyst,X-ray diffraction,X-ray fluorescene,Fourier transform infrared spectroscopy,ultraviolet-visible diffuse reflectance spectroscopy,temperature-programmed reduction of H2,temperature-programmed desorption of NH3,infrared spectroscopy of adsorbed pyridine,H2 chemisorption,nitrogen adsorption-desorption,scanning electron microscopy and thermogravimetric analysis were performed.Kinetics of n-C7 isomerization were investigated under various hydrogen and n-C7 pressures,and the effects of reaction conditions on catalytic performance were studied.The results showed that bi-and trimetallic catalysts exhibit better performance than monometallic catalysts for this reaction.For example,a maximum i-C7 selectivity（ 〉74%） and multibranched isomer selectivity（40%） were observed for Pt-Sn/HZSM5-HMS at 200 ℃.

从天干与脏腑功能关系探讨“金水相生”理论

“金水相生”一般指“肺肾之间相互滋生”的关系,然而,在六腑之中,亦有大肠属金,膀胱属水,根据脏腑的表里关系,推测大肠和膀胱可能也参与了“金水相生”的生理过程。在天干之中,庚金对应大肠,辛金对应肺,壬水对应膀胱,癸水对应肾,因此,笔者通过分析庚、辛、壬、癸的天干内涵来完善大肠、肺、膀胱、肾的脏腑特性,发现四者皆参与了相火及水谷之气的传导过程且紧密联系,从而推导出“金水相生”实质上涉及了大肠、肺、膀胱、肾之间相火及水谷之气的传导过程,其中水液既以载体的形式于三焦中运输相火,又参与了水谷之气的传导过程。