论文部分内容阅读
采用N_2,NH_3,CO_2,乙烯,丙烯,水,甲醇,乙醇,丙醇等作为吸附剂,研究了由我国CXN天然沸石改性制得的H-STI和Na-STI沸石的吸附性质,H-STI和Na-STI沸石的BET表面积及微孔孔体积约为420m~2/g和0.20m~3/g.根据NH_3和CO_2在H-STI沸石上的吸附等温线计算得到它们的吸附热分别为44.8和26.5kJ/mol.乙烯,丙烯,甲醇,乙醇,丙醇等在Na-STI沸石上的吸附等温线表明该沸石对有机分子的吸附具有链长选择性.在低分压下水相对于甲醇的吸附量表明沸石具有一定的疏水性质.
Adsorption properties of H-STI and Na-STI zeolites modified by CXN natural zeolite were studied by using N 2, NH 3, CO 2, ethylene, propylene, water, methanol, ethanol and propanol as adsorbents. The BET surface area and micropore volume of STI and Na-STI zeolites are about 420m 2 / g and 0.20m 3 / g, respectively. According to the adsorption isotherms of NH 3 and CO 2 on H-STI zeolites, Was 44.8 and 26.5 kJ / mol.The adsorption isotherms of ethylene, propylene, methanol, ethanol, propanol, etc. on Na-STI zeolites showed that the zeolites had chain length selectivity for adsorption of organic molecules. The amount of methanol adsorbed indicates that the zeolite has a certain hydrophobic property.