Thesis Archive
EVALUATION OF THE CYCLIC STABILITY OF BIMETAL OXIDES THROUGH CHEMICAL LOOPING COMBUSTION OF PHILIPPINE COAL
Carlos Miguel N. Bueno
Zophia Beatrice I. Nicolas
Bernard Jomari B. Razote
Abstract:
Chemical looping combustion, in contrast to other carbon capture technologies, has the ability to separate CO2 formed from combustion without incurring any energy penalty, making it an optimum choice for a wide range of set-ups. In this study, two mixtures of bimetal oxides, 75Ni25Fe and 75Fe25Cu, were used in the combustion of Philippine coal under three hold temperatures: 700, 800, and 900 °C, wherein the bimetal oxygen carriers were mixed through physical mixing. The study focused on identifying the stability of the bimetal oxides after ten cycles based on its oxygen carrying capacity and conversion. Additionally, the effects of temperature on the stability was also determined.
The scrap metals were characterized using XRD and inductively-coupled plasma optical emission spectroscopy (ICP-OES), and it was determined that the scrap iron contained 69.51% Fe and the copper wire contained 93.41% Cu. Likewise, the bimetals used in the experiment were characterized using ICP-OES to confirm the desired ratios.
Based on 10 redox cycles, it was determined that the temperature effects were largely dependent on the bimetal oxide used such that 75Fe25Cu had an optimum temperature of 800°C, while 75Ni25Fe continued to degrade as the cycle progressed. It was also determined that a logarithmic plot best fit in projecting the cycles of the bimetal oxides based on the oxygen carrying capacity and conversion. According to the logarithmic equation produced, 75Ni25Fe have higher number of cycles wherein it’s viable at all temperatures. However, a more drastic decrease in its number of cycles was observed as the temperature increased when compared with 75Fe25Cu.
Adviser:
Dr. Nathaniel P. Dugos
Dr. Lawrence P. Belo