tailieunhanh - Adsorption of sulfur hexafluoride on 13X zeolite modified by metal cation exchange

The sodium cations of 13X zeolite were replaced by Zn2+, Co2+, Ni2+ and Cu2+ cations contained in the various concentration of nitrate salts solutions. XRD and SEM analysis shows that the cationic exchange process is accompanied by a textural damage for the cation-exchanged 13X zeolites, especially, in the case of Ni2+ and Cu2+-exchanged 13X zeolites. | Tạp chí Khoa học công nghệ và Thực phẩm 15 (1) (2018) 24-33 ADSORPTION OF SULFUR HEXAFLUORIDE ON 13X ZEOLITE MODIFIED BY METAL CATION EXCHANGE Tran Hoai Lam1*, Quach Nguyen Khanh Nguyen2 1 Ho Chi Minh City University of Food Industry 2 Saigon University *Email: thlam01@ Received: 19 December 2017; Accepted for publication: 5 June 2018 ABSTRACT The sodium cations of 13X zeolite were replaced by Zn2+, Co2+, Ni2+ and Cu2+ cations contained in the various concentration of nitrate salts solutions. XRD and SEM analysis shows that the cationic exchange process is accompanied by a textural damage for the cation-exchanged 13X zeolites, especially, in the case of Ni2+ and Cu2+-exchanged 13X zeolites. Investigation of SF6 adsorption indicates that the SF6 removal efficiency and quantity adsorbed depend on the metal cations, the concentration of nitrate salts solution, the SF6 concentration as well as the rate of SF6 flow. In which, the SF6 removal efficiency is only obtained 99% for the Co2+, Zn2+-exchanged zeolites, and the highest SF6 adsorbed quantity is mg/g for exchanged zeolite and mg/g for exchanged zeolite, respectively. Keywords: Sulfur hexafluoride, 13X zeolite, ion-exchange, adsorption, modified. 1. INTRODUCTION Sulfur hexafluoride (SF6) is an inorganic, colorless, odorless, non-flammable and heavy gas with characteristics such as relatively low toxicity, high thermal stability, extreme inertness and high dielectrics. Therefore, it is widely used in the electrical industry, semiconductor, aluminum smelting and magnesium industries, as well as medical applications such as the ultrasonography and in ophthalmologic surgeries [1–3]. However, the extremely stable natures of the SF6 molecules with long lifetimes in the atmosphere of 3200 years and its high efficiency as infrared absorbers make it become to the very powerful greenhouse gas. The high global warming potential SF6 is 22800 times more potent than CO2 in terms of their