List of Articles Spent catalyst Open Access Article Abstract Page Full-Text 1 - Kinetics of Nickel Leaching from Spent Catalyst in Nitric Acid Solution Saeid Gitipour Fatemeh Akbar Pour Saeid Firouzbakht 10.22034/jest.2019.26956.3592 Open Access Article Abstract Page Full-Text 2 - Recycling the Spent Catalysts of Claus Unit in Natural Gas Refineries and Their Application for Synthesis of Composite Adsorbents Coated by Polypyrrole for the removal of lead ions Nima Fallah Tayebeh Johari mohammad Toosi mohammad hasan Peyrovi 10.22034/jest.2020.33711.4133