TY - JOUR ID - 17611 TI - A Systematic Study on the Effect of Desilication of Clinoptilolite Zeolite on its Deep-Desulfurization Characteristics JO - Nanochemistry Research JA - NCR LA - en SN - 2538-4279 AU - Mahmoudi, Rahman AU - Falamaki, Cavus AD - Chemical Engineering Department, Mahshahr Campus, Amirkabir University of Technology, Mahshahr, Iran Y1 - 2016 PY - 2016 VL - 1 IS - 2 SP - 205 EP - 213 KW - Clinoptilolite KW - Deep desulfurization KW - Desilication KW - Thiophene derivatives KW - Zeolite DO - 10.7508/ncr.2016.02.007 N2 - Natural clinoptilolite zeolite (CLP) in its original or metal ion- exchanged form (Ni2+) is a weak adsorbent for relatively large thiophene derivative molecules like benzothiophene (BT) and di-benzothiophene (DBT), due to its rather restricted micro-channel structure. A novelty of this work is that upon desilication treatments, it is possible to enhance the adsorption behavior of Ni2+-exchanged CLP for such large sulfur- containing molecules. A natural CLP zeolite has been desilicated using NaOH solutions in a concentration range of 0.2-2.0 M. The resulting powders have been subjected to XRF, XRD, FTIR, nitrogen adsorption/desorption, TEM and TGA analyses. The adsorption isotherms for the removal of thiophene (TP), BT, DBT and iso-propyl mercaptan (IPM) have been obtained experimentally at 20 °C from simulated liquid fuels using iso-octane as solvent. The sample treated with 1.5 M NaOH solution showed the most significant enhancement in adsorptive properties. The selectivity order is IPM > TP > BT > DBT. Regenerability tests show a quasi constant adsorption capacity after the first cycle. The observed phenomena have been thoroughly discussed based on the physico-chemical analyses of the samples. UR - http://www.nanochemres.org/article_17611.html L1 - http://www.nanochemres.org/article_17611_272eca5821e5cc7ecc3561efbe261020.pdf ER -