Natural and Acid Treated Mordenite As Adsorbents of Ethylene

NATURAL AND ACID TREATED MORDENITE AS ADSORBENTS OF ETHYLENE

Burcu ERDOĞAN ALVER a

a Department of Physics, Science Faculty, Anadolu University, 26470, Eskisehir, Turkey *: E-mail:[email protected]

Abstract: Mordenite is a natural zeolite that has been used as an adsorbent for many applications. It contains two types of hollow channels. The ellipsoidal 12-membered ring channel with a aperture of 7.0 × 6.5 Å and 8-membered ring channel with a aperture of 5.7 × 2.6 Å run parallel to the c axis. Channels A and B are interconnected via perpendicular compressed 8- membered channel (3.4 × 4.8 Å), in the form of small side pockets parallel to the b axis [1-3]. Mordenite-rich mineral (M) used in this study originated from Şile (Ağva), Turkey. First, mordenite sample was crushed and sieved to obtain < 63 m fractions. In order to investigate the effect of acid treatment on the structure of the mordenite tuff for C2H4 removal, samples o were treated with 100 ml of HNO3 and H2SO4 solutions (1.0, 3.0 and 5.0 M) at 80 C for 3 h by batch method. Before the experimental procedure, all samples were dried in an oven at 120 oC for 20 h and stored in a desiccator. The resulting acid-treated samples were named as M- 1N, M-3N, M-5N, M-1S, M-3S and M-5S according to their corresponding 1.0, 3.0, and 5.0 M HNO3 and H2SO4 treatments, respectively. The XRD diffractograms were obtained with a BRUKER D8 Advance X-ray diffractometer using CuKα radiation (λ=1.54 Å) in the range 5- 40 °2θ at room temperature. The specific BET surface areas were calculated from the first part of the N2 adsorption isotherm (0.05 < P/P0 < 0.30) obtained at 77 K with N2 in Autosorb- 1C equipment (Quantachrome Instruments, U.S.A.). The adsorption isotherms of C2H4 on natural and acid modified mordenites were determined using automated Autosorb 1 volumetric equipment up to 100 kPa at 273 K.

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