Nitric oxide (NO) emissions from automobile exhaust can be reduced by using a catalytic converter, and the following reaction occurs at the catalytic surface:
The concentration of NO is reduced by passing the exhaust gases over the surface, and the rate of reduction at the catalyst is governed by a first-order reaction of the form given by Equation 14.66. As a first approximation it may be assumed that NO reaches the surface by one-dimensional diffusion through a thin gas film of thickness L that adjoins the surface. Referring to Figure 14.7, consider a situation for which the exhaust gas is at 500°C and 1.2 bars and the mole fraction of NO is
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Fundamentals of Heat and Mass Transfer
- An unknown amount of propane Fuel having a chemical formula C3H8 is burned with an unknown amount of air in a four-cylinder engine. The analysis of the engine exhaust gives the resulting reaction: 5.5 moles CO2, 18.87 moles H20, unknown moles 02, unknown moles N2, 8.8 moles CO and 0.2 moles H2: The number of moles of the products is: Select one: O a. 201.2 O b. 97.2 O c. 121.9 O d. 145.9 O e. 98.7arrow_forwardC4Hs is burned in an engine with a fuel-rich air-fuel ratio. Dry analysis of the exhaust gives the following volume percents: CO2 = 14.95%, C4H8 0.75%, CO = 0%, H2 = 0%, O2 = 0%, with the rest being N2. Higher heating value of this fuel is QHHV = 46.9 MJ/kg. Write the balanced chemical equation for one mole of this fuel at these conditions. Calculate; a) Air-fuel ratio. b) Equivalence ratio. c) Lower heating value of fuel. [MJ/kg] d) Energy released when one kg of this fuel is burned in the engine with a combustion efficiency of 98%. [MJ]arrow_forwardFuel oil has the following composition (in % by mass): carbon 85%, hydrogen 13%, and sulfur 2%. Calculate: (a) the stoichiometric and actual air-fuel ratios for the combustion with a 10% excess air in kg/kg, and (b) the mole fractions of the products of combustion. Ignore the air humidity.arrow_forward
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