首页|Investigating the Cold Plasma Surface Modification of Kaolin- and Attapulgite-Bound Zeolite A
Investigating the Cold Plasma Surface Modification of Kaolin- and Attapulgite-Bound Zeolite A
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NSTL
Elsevier
Hydrophilic zeolites with low catalytic activity are considered as suitable adsorbents for drying gas streams 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 synthesized from kaolin using the hydrothermal method. Surface and bulk characterization is performed using X-ray diffraction (XRD), scanning electron microscopy (SEM), N-2 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 decreases the weak acidic site density of the extrudates. The obtained results show that attapulgite/zeolite extrudates are more affected by plasma treatment than kaolin/zeolite extrudates. The catalytic activity of untreated and plasma-treated extrudates are compared with respect to coke formation resulting from 1-butene and 1,3-butadiene. The plasma-treated sample is more resistant to coke formation (similar to 35% decrease compared to untreated one). The potassium contents of extrudates decreased as a result of sputtering loosely bound potassium cations on the crystal surface by argon ions, which led to a decrease in water sorption capacity (by similar to 15% of the initial sorption capacity). (C) 2021 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chem-istry.
Ejtemaei, Mahboobeh、Salari, Dariush、Niaei, Aligholi、Sadighi, Sepehr、Rashidzadeh, Mehdi、Khorram, Sirous、Back, Jan O.、Penner, Simon、Noisternig, Michael F.
NSTL
Elsevier
