Petroleum University of Technology, Ahwaz, Iran
Title: Recycling CO2 as a sustainable source of energy for power plants
Mohammad Ali Takassi has obtained his Ph.D. in physical chemistry from the University of Mississippi, Oxford Mississippi. He worked as post-doctoral research associate for one year at Sothern Methodist University, Dallas, Texas. He is currently professor of chemistry and chair, the department of science, Petroleum University of Technology, Ahwaz, Iran.
Environment friendly energy and alternative energy are major area of research for sustainable energy development. CO2 can convert into synthesis gas which it may be used as fuel in power plants. CO2 reforming of methane and CO2 hydrogenation reactions are shown in Eqs 1, 2:
CH4 + CO2 → 2CO + 2H2 (1)
CO2 + H2 ↔ CO + H2O (2)
Most power plants are operated by fossil fuel; they produce millions of tons CO2 annually. Combustion of fossil fuel is shown in Eq. 3.
Fuel + nO2 → mCO2 + pH2O + energy (3)
In present study iron-molybdenum/zirconia and cobalt-molybdenum/γ-alumina catalysts were prepared. The activity of Fe-Mo/ZrO2 nano catalyst was studied for CO2 reforming of methane in a fixed bed reactor. The effect of reaction temperatures on CH4 conversion was investigated with CH4:CO2 ratio of 1:1 and total feed rate 30000 mL.h-1(g cat)-1. The stability experiment for Fe-Mo/ZrO2 catalyst was conducted at 873ok for 30 hours. 82% conversion of methane was recorded at 1073ok. The activity of Co-Mo/γ-Al2O3 catalyst was studied for hydrogenation of carbon dioxide. Kinetic property of this catalyst was studied in a batch reactor at a temperature of 823ok and at a pressure of 12 bars, with CO2: H2 1:3 ratio. The stability experiments were carried out in a fixed bed reactor. Using this catalyst, CO2 was converted into CO (63%) and CH4 less than 1% in twenty minutes of reaction time. These two reactions of CO2 could recycle CO2 as fuel for power plants.