Estimation of Enthalpy of formation of metal hydrides – Effect of Different Measurement Parameters

EasyChair Preprint no. 423

Abstract

The enthalpy of formation of metal hydrides is estimated by van't Hoff equation. Pressure Concentration Isotherms (PCIs) at different temperatures are used to obtain van't Hoff plot. Enthalpy of formation is an important input in simulation and performance estimation of metal hydride based engineering devices. The absolute error in the measurement of enthalpy of formation depends upon the relative error of PCI measurements. The error in the estimation of this quantity depends upon the number of temperature points used for obtaining van't Hoff plot and temperature range and size of the range. In the present study PCIs of MmNi3.5Co0.8Al0.7 hydride were measured in the temperature range of 20 to 240°C. The effect of number of temperature points, temperature range and size of the range on the estimation of enthalpy of formation is studied. The effect of the temperature range and size of the range is found to be more sensitive in the estimation of enthalpy of formation.

Keyphrases: enthalpy of formation, Metal hydride, PCIs, Van’t Hoff plot

@Booklet{EasyChair:423,
  author = {Anil Kumar Emadabathuni and Dhananjay Mishra and Vinor Kumar Sharma},
  title = {Estimation of Enthalpy of formation of metal hydrides – Effect of Different Measurement Parameters},
  howpublished = {EasyChair Preprint no. 423},

  year = {EasyChair, 2018}}