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The reduction of CO2 with H2 on Pt catalysts is described by the equation CO2(G) + H2 (ads) → H2O + CO According to which well-known mechanism does this hydrogenation proceed (with explanation)?
The following data was obtained for the adsorption of nitrogen on alumina at 77 K. The vapor pressure of N2 at 77 K is 1 atm. Estimate the surface area (m2/g) by BET method assuming the area occupied by one N2 molecule to be 16.2 x10-20 m2. (6) Pressure, mm Hg 8 30 50 102 130 148 233 258 330 442 480 Volume adsorbed, cm at STP 103 3 116 130 148 159 163 188 198 221 270 294
A mixture of benzene and toluene containing 40 mole % of benzene is to be separated to give a product of 90 mole % benzene at top and a bottom product with not more than 10mole % benzene. Using an average value of 2.4 for relative volatility of benzene relative to toluene, calculate the number of theoretical plates required at total reflux. Also calculate the minimum reflux ratio, if the feed is liquid and is at its boiling point
In a mass transfer apparatus operating at 1 atm. the individual
mass transfer coefficients have the following values
kx = 22 kmol/ m2
. h (Δx = 1)
ky = 1.07 kmol/ m2
. h (Δy = 1)
The equilibrium compositions of the gaseous and liquid phases are
characterized by Henry’s law:
p = 0.08 x 106
x, mm of Hg
(i) Determine the overall mass transfer coefficients Kx and Ky.
(ii) Determine the ratio of diffusional resistances of the liquid and gaseous
phases.
Hydrochloric acid (A) diffuses through a thin film of water (B)
4 mm thick at 283 K and 1 atm ressure. The concentration of HCl at point 1 on
one boundary of the film is 12 wt % with density of 1060.7 kg/m3
and on the
other boundary, at point 2, is 4 wt % of density1020.15 kg/m3
. The diffusivity
of HCl in water at 293 K and 1.5 atm is 2.5 x 10-9 m
2
/s. Calculate the flux of
HCl considering water to be stagnant.
Ammonia is being absorbed from air-ammonia mixture by
sulphuric acid solution. The concentration of ammonia 2.5 cm from the acid
surface is 40% by volume and concentration at the acid surface is zero. The
total pressure of the system is 400 mm Hg and the temperature is 288 K. The
value of diffusivity is 1.73 X 10-5 m2
/s at 293 K and 1 atm. Calculate the
following:
(i) Rate of absorption of ammonia across 0.045 m2
of acid surface.
(ii) Concentration of ammonia 1.25 cm from the acid surface
To condition the air in an office building in the winter, 1000 cm3 of moist air at 101 kPa and22oC enters the process. The air leaves the process at 98 kPa. How many kg of water
vapour are added to each kg of wet air entering the process? Partial pressure of water in
entering air is 1.31 kPa; Partial pressure of water in leaving air is 18.14 kPa.
In steady state ideal PFR, the concentration of reactant_____decreases/increases/stays constant) from entrance to exit of the reacto reactor?
5)In steady state ideal CSTR, the exit concentratar of reactant( is equal to,is less than,is grater than) the concentration of the reactant inside the reactor?
4)During the progress of the reaction in the batch reactor, the concentration of reactant(decreases,increases)with increasing time?
