硅沸石Silicalite－1吸附与脱附性质的研究Ⅰ．若干气体及小分子烃类的吸附与脱附

用微量真空电子吸附天平于室温下测定氟里昂－１２（二氟二氯甲烷），ＳＯ＿２、ＣＯ＿２、ＮＨ＿３、ＣＯ、Ｎ＿２／Ｏ＿２、丙烯、丙烷、正己烷、环己烷、异己烷、苯、对位、间位与邻位二甲苯在结构完美的疏水硅沸石Ｓｉｌｉｃａｌｉｔｅ－１上的吸附等温线与脱附速率曲线，以及甲烷在不同温度下的吸附等温线。结果表明氟里昂－１２、ＳＯ＿２、ＣＯ＿２、ＮＨ３的吸附量随压力增加而加大，ＣＯ、Ｎ＿２／Ｏ＿２却基本上不为硅沸石吸附。硅沸石Ｓｉｌｉｃａｌｉｔｅ－１对饱和烃吸附的亲和性强于不饱和烃。它选择吸附分子尺寸小于０．６０ｎｍ的正己烷、环己烷、苯与对二甲苯，而不吸附分子尺寸大子０．６０ｎｍ的异己烷，间位及邻位二甲苯。

Sorption and Desorption on SiliCalite-1Ⅰ.Sorption and Desorption of Some Gases and Small Molecule Hydrocarbons

Adsorption isotherms and desorption rate curves were determined on a hydrophobic zeo-lite silicalite-1 with perfect crystal structure using micro electron adsorption balance undervacuum for freon-12,SO_2,CO_2,NH_3, CO,N_2/O_2,propane, propylene,n-hexane,cyclo- hexane,iso-hexane,benzene,P-xylene,o-xylene and m-xylene at room telnperature, andfor methane at various temperalures.The adsorption of freon-12, CO_2,SO_2 and NH_3 increaseswith increasing pressure,and adsorption of CO and N_2/O_2 is neigligible on the zeolite. Adsorption affinity of silicalite-1 to saturated hydrocarbons is stronger than that of unsaturatedhydrocarbons.The zeolite is selective in adsorbing n-hexane,cyclo-hexane,benzene,p-xy-Hene with molecular size smaller than 0.59 nm,and excludes iso-hexane,o-and m-xylenewith molecular size larger than 0.60 nm.