Reduction of Metal Oxide to Metal using Ionic Liquids Metadata

Title

• Main Title Reduction of Metal Oxide to Metal using Ionic Liquids

Creator

• Author: Reddy, Dr. Ramana
  Creator Type: Personal

Contributor

• Sponsor: United States. Department of Energy.
  Contributor Type: Organization
• Sponsor: United States. Department of Energy. Office of Energy Efficiency and Renewable Energy.
  Contributor Type: Organization
  Contributor Info: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Publisher

• Name: The University of Alabama
  Place of Publication: United States

Date

• Creation: 2012-04-12

Language

• English

Description

• Content Description: A novel pathway for the high efficiency production of metal from metal oxide means of electrolysis in ionic liquids at low temperature was investigated. The main emphasis was to eliminate the use of carbon and high temperature application in the reduction of metal oxides to metals. The emphasis of this research was to produce metals such as Zn, and Pb that are normally produced by the application of very high temperatures. The reduction of zinc oxide to zinc and lead oxide to lead were investigated. This study involved three steps in accomplishing the final goal of reduction of metal oxide to metal using ionic liquids: 1) Dissolution of metal oxide in an ionic liquid, 2) Determination of reduction potential using cyclic voltammetry (CV) and 3) Reduction of the dissolved metal oxide. Ionic liquids provide additional advantage by offering a wide potential range for the deposition. In each and every step of the process, more than one process variable has been examined. Experimental results for electrochemical extraction of Zn from ZnO and Pb from PbO using eutectic mixtures of Urea ((NH2)2CO) and Choline chloride (HOC2H4N(CH3)3+Cl-) or (ChCl) in a molar ratio 2:1, varying voltage and temperatures were carried out. Fourier Transform Infra-Red (FTIR) spectroscopy studies of ionic liquids with and without metal oxide additions were conducted. FTIR and induction coupled plasma spectroscopy (ICPS) was used in the characterization of the metal oxide dissolved ionic liquid. Electrochemical experiments were conducted using EG&G potentiostat/galvanostat with three electrode cell systems. Cyclic voltammetry was used in the determination of reduction potentials for the deposition of metals. Chronoamperometric experiments were carried out in the potential range of -0.6V to -1.9V for lead and -1.4V to -1.9V for zinc. The deposits were characterized using XRD and SEM-EDS for phase, morphological and elemental analysis. The results showed that pure metal was deposited on the cathode. Successful extraction of metal from metal oxide dissolved in Urea/ChCl (2:1) was accomplished. The current efficiencies were relatively high in both the metal deposition processes with current efficiency greater than 86% for lead and 95% for zinc. This technology will advance the metal oxide reduction process by increasing the process efficiency and also eliminate the production of CO2 which makes this an environmentally benign technology for metal extraction.
• Physical Description: 1.4 MB

Subject

• STI Subject Categories: 36 Materials Science Metal Extraction, Reduction Of Metal Oxides, Elewctrodeposition, Ionic Liquids
• Keyword: Metal Extraction, Reduction Of Metal Oxides, Elewctrodeposition, Ionic Liquids

Collection

• Name: Office of Scientific & Technical Information Technical Reports
  Code: OSTI

Institution

• Name: UNT Libraries Government Documents Department
  Code: UNTGD

Resource Type

• Report

Format

• Text

Identifier

• Report No.: Final STI Report
• Grant Number: EE0003459
• DOI: 10.2172/1056478
• Office of Scientific & Technical Information Report Number: 1056478
• Archival Resource Key: ark:/67531/metadc843328