A. Its activity declines rapidly, if heated to above 520°C
B. It decomposes ammonia
C. It gets oxidised above 500°C
D. None of these
Related Mcqs:
- Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in ______________ of the catalyst ?
A. Stabilisation
B. Increasing the effectiveness
C. Improving the strength & heat resistance
D. All A, B & C - Catalyst used in ammonia synthesis uses ____________ as a promoter?
A. Pt
B. K2O
C. Al2O3
D. Ni - Which is a catalyst promoter used in catalytic ammonia synthesis reaction ?
A. Al2O3
B. Cr2O3
C. K2O
D. MnO - In _____________ converter for ammonia synthesis, the catalyst is arranged in the form of a single continuous bed?
A. Fauser-Montecatini
B. Claude
C. Uhde
D. Kellogg - Catalytic ammonia synthesis reaction as in Haber’s process is_________________?
A. Endothermic
B. Exothermic
C. Irreversible
D. None of these - Which of the following is not a commercially used feed-stock for the production of ammonia synthesis gas ?
A. Water
B. Naphtha
C. Tar
D. Coal/coke oven gas - Which of the following is the costliest method for commercial production of hydrogen for ammonia synthesis ?
A. H2 separation from coke oven gas
B. Steam reforming of naphtha
C. Cracking of natural gas
D. Electrolysis of water - Ammonia synthesis reaction is______________________?
A. Exothermic
B. Endothermic
C. Autocatalytic
D. None of these - Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature___________________?
A. Rate of reaction is very low
B. Very high pressure is required resulting in costly pressure vessel
C. Space velocity of gas is very low resulting in decreased conversion
D. None of these - Low grade coal is ______________ to produce ammonia synthesis gas?
A. Hydrogenated
B. Liquefied
C. Gasified
D. Dehydrogenated
