Chemical Reaction Engineering

Question: A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following…

Question: For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the [A]. catalyst size is reduced or the catalyst diffusivity is reduced. [B]. catalyst size is reduced or the catalyst diffusivity is increased. [C]. catalyst size is increased or the catalyst diffusivity…

Question: A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length [A]. decreases. [B]. increases. [C]. is at the highest allowable temperature throughout. [D]. first increases and then decreases. Answer: Option C Explanation: No…

Question: An example of autothermal reactor operation is [A]. sulphur dioxide oxidation [B]. ethylene oxidation [C]. benzene oxidation [D]. ammonia synthesis Answer: Option B Explanation: No answer description available for this question.

Question: A typical example of an exothermic reversible reaction conducted at high pressure in industry is [A]. dehydration of ethanol. [B]. methanol synthesis. [C]. reformation of methane. [D]. polymerisation of ethylene. Answer: Option A Explanation: No answer description available for this question.

Question: For a heterogenous catalytic reaction, A + B C, with equimole feed of A and B, the initial rate – rA0 is invariant with total pressure. The rate controlling step is [A]. surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase. [B]. surface reaction between absorbed A and absorbed…

Question: Given, 3H2 + CO = CH4 + H2O, KP = 101.84 and, 4H2 + CO2 = CH4 + 2H2O, KP = 101.17the KP for the reaction CO + H2O = CO2 + H2 is [A]. 103.01 [B]. 10-0.67 [C]. 10-3.01 [D]. l00.67 Answer: Option D Explanation: No answer description available for this question.

Question: If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to [A]. the intrinsic activation energy E. [B]. (E + ED) where ED is activation due to diffusion. [C]. (E + ED)/2 [D]. ED/2 Answer: Option D Explanation: No answer description available for this question.

Question: A first order reaction A B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by [A]. diffusion within the pellet. [B]. reaction. [C]. external mass transfer. [D]. none of…

Question: For the gaseous reaction 2A B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is [A]. 1 [B]. -0.5 [C]. -0.25 [D]. 0 Answer: Option C Explanation: No answer description available for this question.