Adsorption of Chlorinated Compounds (Chlorobenzene, Chloroform, and Carbon Tetrachloride) on Microporous SiO2, Ag-Doped SiO2 and Natural and Dealuminated Clinoptilolites

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• 作者：Miguel A. Herná ; ndez ; Ana I. Gonzá ; lez ; Fernando Rojas ; Maximiliano Asomoza ; Silvia Sol&iacute ; s ; Roberto Portillo
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：May 9, 2007
• 年：2007
• 卷：46
• 期：10
• 页码：3373 - 3381
• 全文大小：230K
• 年卷期：v.46,no.10(May 9, 2007)
• ISSN：1520-5045

文摘

Adsorption isotherms of chloroorganic compounds on natural and dealuminated clinoptilolite zeolites, aswell as on pure and Ag-doped microporous SiO₂, were measured by a gas chromatography technique. TheSiO₂ microporous solids were synthesized by the sol-gel method from tetraethoxysilane and in the presenceof methanol. Dealuminated clinoptilolite zeolites were obtained by means of HCl treatment of a naturalprecursor. Adsorption of chlorinated compounds (C_xH_yCl_z), such as chlorobenzene, chloroform, and carbontetrachloride, on SiO₂, Ag-doped SiO₂ and on the clinoptilolite zeolites was studied in the temperature rangeof 398-498 K. The Freundlich and Dubinin-Astakhov adsorption equations approximately fitted the C_xH_yCl_z adsorption data, within the selected temperature range. The energies of interaction between chlorinatedadsorbates and microporous SiO₂, Ag-doped SiO₂, and clinoptilolite substrates were evaluated from the isostericheats of adsorption (q_st), which were found to obey the following decreasing order: q_st (chlorobenzene) > q_st(chloroform) > q_st (carbon tetrachloride).