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- 저자 : Michael F. Noisternig (검색결과 1 건)
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Investigating the Cold Plasma Surface Modification of Kaolin- and Attapulgite-Bound Zeolite A
Mahboobeh Ejtemaei,Sepehr Sadighi,Mehdi Rashidzadeh,Sirous Khorram,Jan O. Back,Simon Penner,Michael F. Noisternig,Dariush Salari,Aligholi Niaei 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Hydrophilic zeolites with low catalytic activity are considered as suitable adsorbents for drying gasstreams containing olefinic compounds. In this contribution, the surface treatment of kaolin and attapulgite/zeolite A extrudates is investigated using argon glow discharge plasma. The zeolite is synthesizedfrom kaolin using the hydrothermal method. Surface and bulk characterization is performed using X-raydiffraction (XRD), scanning electron microscopy (SEM), N2 physisorption, Fourier-transform infrared (FTIR)spectroscopy, temperature-programmed-desorption (TPD) of NH3 and X-ray photoelectron spectroscopy(XPS) techniques. Plasma treatment increases surface area and pore volume, but it decreasesthe weak acidic site density of the extrudates. The obtained results show that attapulgite/zeolite extrudatesare more affected by plasma treatment than kaolin/zeolite extrudates. The catalytic activity ofuntreated and plasma-treated extrudates are compared with respect to coke formation resulting from1-butene and 1,3-butadiene. The plasma-treated sample is more resistant to coke formation (35%decrease compared to untreated one). The potassium contents of extrudates decreased as a result of sputteringloosely bound potassium cations on the crystal surface by argon ions, which led to a decrease inwater sorption capacity (by 15% of the initial sorption capacity).
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