Sharif University of Technology Scientia Iranica 1026-3098 26 6 2019 12 01 Activated nanoporous carbon from walnut shell as a promising adsorbent for methane storage in adsorbed natural gas technology 3447 3455 21553 10.24200/sci.2019.51790.2373 EN A. Nouralishahi Energy, Environment & Nanostructure Material Laboratory, Caspian Faculty of Engineering, College of Engineering, University of Tehran, P.O. Box 4386156387, Iran. M. Bahaeddini Energy, Environment & Nanostructure Material Laboratory, Caspian Faculty of Engineering, College of Engineering, University of Tehran, P.O. Box 4386156387, Iran. A. Rashidi Nanotechnology Research Center, Research Institute of Petroleum Industry (RIPI), Tehran, P.O. Box 14665-1998, Iran. Sh. Mahinnezhad Energy, Environment & Nanostructure Material Laboratory, Caspian Faculty of Engineering, College of Engineering, University of Tehran, P.O. Box 4386156387, Iran. A. Fazeli Energy, Environment & Nanostructure Material Laboratory, Caspian Faculty of Engineering, College of Engineering, University of Tehran, P.O. Box 4386156387, Iran. Journal Article 2018 09 17 Abstract<br />Activated carbon from walnut shell is studied for methane storage in this research. The samples are ‎synthesized by zinc chloride and phosphoric acid, as activating agents. The effect of physical ‎activation, after chemical activation steps, on the final structure of the samples and their total methane ‎storage is examined. The results show that physical activation has an improving effect on the total ‎capacity of the samples activated by phosphoric acid, however; it has a reverse effect on the ‎capacity of zinc chloride activated ones. The experimental data show that the best capacity is ‎obtained at impregnation ratios of 0.7 and 1.2 in the case of phosphoric acid and zinc chloride ‎activated samples, respectively. The best sample is the one activated by phosphoric acid with ‎impregnation ratio of 0.7 and subsequently physically activated by carbon dioxide. It has the BET ‎surface area of 1479 m2/g, average pore diameter of 4.2 nm, total pore volume of 0.84 cm3/g and ‎methane adsorption capacity of 159 cm3/g. The sample shows high stability during successive ‎adsorption/desorption cycles experiment. ‎ https://scientiairanica.sharif.edu/article_21553_b3c8e4f2eb7a4f6d144ff7f83d55332c.pdf