The carbon gasification (Boudouard) reaction, C+ CO2-2CO, is important to many e

Question

The carbon gasification (Boudouard) reaction, C+ CO2-2CO, is important to many extractive and refining processes as well as gasification of coal and biomass (wood or municipal waste). a) Make two charts of equilibrium gas composition as a function of temperature over the range 400°C to 1400°C; in the 1st use pco/P as the y-axis and in the 2nd log (pco/pco2); Assume P- pco pco2 1 atm. and ac 1 b) By all appearances, CO gas is stable at room temperature. Is this in agreement with thermodynamics? If not explain why CO seems stable. c) Consider the gasifier shown in the notes operating at 1000°C, pco+ pco2 0.25 atm. At this temperature the gasification reaction is very fast. What does this imply for the actual exit gas composition relative to the equilibrium? Assuming the exit gas is at equilibrium would pco/P be greater than or less than that calculated in part (i)? Justify your answer

Explanation / Answer

Answer:

boudouard reaction is redox reaction of chemical equillibrium mixture of carbon monoxide and carbon dioxide

2CO is reversible with CO2 + C

boudouard reaction to form carbon dioxide and carbon is exothermic at all temperatures . The standard enthalpy of

boudouard reaction becomes less negative with increasing temperature .

while the formation enthalpy of CO2 is higher than that of CO , the formation entropy is much lower . Consequently , the standard free energy of formation of CO2 from its component element is almost constant and independent of temperature , while the free energy of formation of CO decreases with temperature .

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