Accession Number : ADA331070

Title :   A Determination of V205 Activity in Corrosive Molten Vanadate-Sulfate Phases.

Descriptive Note : Conference proceedings,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Jones, Robert L. ; Reidy, Richard F.

PDF Url : ADA331070

Report Date : 23 JUN 1994

Pagination or Media Count : 12

Abstract : Although aggressive hot corrosion by molten vanadate-sulfate deposits in boilers and engines burning low-quality fuel has been known for 75 years or more, there is surprisingly little data in the literature on the thermochemistry of Vanadate-sulfate melts, especially as to the activity of the corrosive V2O5 component. We have recently devised a thermogravimetric (TGA)/S03 equilibrium technique that could potentially be used to 'chart' the V2O5 activity in vanadate-sulfate melts over a wide range of Na/V ratios, SO3 partial pressures and temperatures. The method is illustrated in a study of the reaction of CeO2 with a NaVO3-Na2SO4-V2O5-SO3 melt system (Na/V = 1) at 800 deg C. Results from the study define the conditions under which CeO2 will be chemically nonreactive with the melt, and also show the V2O5 activity coefficient to be, for the given experimental conditions, of the order of 0.01

Descriptors :   *SYMPOSIA, *THERMODYNAMICS, *FUELS, *THERMOGRAVIMETRIC ANALYSIS, CORROSION, COMBUSTION, VANADIUM COMPOUNDS, SULFATES, PARTIAL PRESSURE, CERIUM COMPOUNDS, VANADATES.

Subject Categories : Physical Chemistry
      Properties of Metals and Alloys
      Fuels

Distribution Statement : APPROVED FOR PUBLIC RELEASE