Katoh Masahiro, Shinkawa Manabu, Tomida Tahei
Department of Chemical Science and Technology, Faculty of Engineering, The University of Tokushima, Tokushima 770-8506, Japan.
J Colloid Interface Sci. 2004 Sep 15;277(2):280-4. doi: 10.1016/j.jcis.2004.04.067.
The properties of nitrogen, carbon dioxide, and nitrogen dioxide adsorption onto mesoporous chromium silicates were studied by measurements of both the adsorption isotherms and the IR spectra. The pore sizes of two types of chromium silicates, Cr-FSM-16 (Si/Cr=170 (Cr-FSM-16 [170]) and 390 (Cr-FSM-16 [390])), which contain different amount of Cr, were 2.75 nm. BET surface areas of Cr-FSM-16 were 590 m2/g and they were smaller than that onto FSM-16. The initial heat of adsorption of nitrogen onto Cr-FSM-16 was higher than that onto FSM-16. But the initial heat of adsorption of carbon dioxide onto Cr-FSM-16 was smaller than that onto FSM-16. These results indicated that Cr in Cr-FSM-16 decreased adsorption interaction with carbon dioxide. When nitrogen dioxide was adsorbed on FSM-16 and Cr-FSM-16 at 303 K under no light, an absorption band of nitrogen monoxide adsorbed was measured by IR spectroscopy. This decomposition of nitrogen dioxide by FSM-16 and Cr-FSM-16 was caused by SiOH and Cr, respectively.
通过吸附等温线和红外光谱测量，研究了介孔铬硅酸盐对氮气、二氧化碳和二氧化氮的吸附特性。两种含不同Cr量的铬硅酸盐Cr-FSM-16（Si/Cr = 170（Cr-FSM-16 [170]）和390（Cr-FSM-16 [390]））的孔径为2.75 nm。Cr-FSM-16的BET表面积为590 m²/g，比FSM-16的小。氮气在Cr-FSM-16上的初始吸附热高于在FSM-16上的。但二氧化碳在Cr-FSM-16上的初始吸附热小于在FSM-16上的。这些结果表明，Cr-FSM-16中的Cr降低了与二氧化碳的吸附相互作用。当在303 K无光照条件下，二氧化氮吸附在FSM-16和Cr-FSM-16上时，通过红外光谱测量到了吸附的一氧化氮的吸收带。FSM-16和Cr-FSM-16对二氧化氮的这种分解分别是由SiOH和Cr引起的。
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