Tungsten alloy oxidation behavior in air and steam: Fusion Safety Program/activation products task

Abstract

This document ¢._nt_ns new concepts or _e au_or(s) imerpretation of new calculations as_ct/or measurements; accon:lingty, EG&G IclaJ_o, inc. is requirecl by the United States Government to include _e following disclaimer:

Reduction and oxidation kinetics of NiWO4 as an oxygen carrier for hydrogen storage by a chemical looping process

“…This means that during the oxidation process WO 3 was not formed as an intermediate specie. This behavior is consistent with previous studies performed by Wendel 60 and Smolik et al 61,62 that described the oxidation of W with H 2 O as follows:…”

“…The facts that all W was reacted with Ni and H 2 O to form NiWO 4 and that no loss of W was found during the TGA tests corroborates that WO 3 is not an intermediate during the oxidation step and that the formation on NiWO 4 prevents the volatilization of W in the present research. Furthermore, activation energy for the oxidation of W with steam has been reported to be 129 and 139 kJ mol À1 according to Smolik et al, 61,62 which is 2.6 times greater than the activation energy reported in Fig. 9, this is presumably attributed to the presence of Ni during the oxidation process and to the unique coral-like morphology of W + Ni that presents an interparticle porous network as seen in SEM Fig.…”