A301 catalyst for ammonia synthesis with Fe 1- x O as precursor was promoted by Al 2O 3, K 2O, CaO and other metallic oxides. The precursor Fe 1- x O is stable in kinetics under the existence of the precursors, althou...A301 catalyst for ammonia synthesis with Fe 1- x O as precursor was promoted by Al 2O 3, K 2O, CaO and other metallic oxides. The precursor Fe 1- x O is stable in kinetics under the existence of the precursors, although it is unstable in thermodynamics below 843 K. The reduced A301 catalyst has good heat resistance. The activity can be recovered completely in case of short period poison by carbon monoxide, but can not be recovered when the catalyst is poisoned by sulphur and its compounds. The purification of synthesis gas, especially desulphurization and deoxidation, is a key to ensure the stable performance and NH 3 production capacity of A301 catalyst.展开更多
The activity, specific rate of reaction and usable ratio of inner surface (URIS) for commercial A301 ammonia catalyst were measured in a tube packed bed reactor. The reaction conditions were: pressure of 7.0 , 10.0 an...The activity, specific rate of reaction and usable ratio of inner surface (URIS) for commercial A301 ammonia catalyst were measured in a tube packed bed reactor. The reaction conditions were: pressure of 7.0 , 10.0 and 15.0?MPa, temperature of 325—450?℃, space velocity of 6000, 8000 and 10000?h -1 and particle size of 0.6—0.9,1.6—2.5,2.5—3.0, 3.0—4.0 and 4.0—6.7 mm. The outlet ammonia concentration, specific rate and URIS decreased with increasing particle size. URIS of commercial catalyst depended not only on particle size, but also on temperature and catalyst efficiency. Particle size was the most important factor for URIS. With increasing particle size from 0.6—0.9?mm to 4.0—6.7?mm, URIS of catalyst decreased from 1 to 0.74—0.80. For the same size range of catalyst,URIS depended on temperature and catalyst efficiency. Above the temperature of 350?℃,catalyst efficiency and URIS increased with rising temperature. But below 350?℃,URIS increased with the decrease of temperature.展开更多
文摘A301 catalyst for ammonia synthesis with Fe 1- x O as precursor was promoted by Al 2O 3, K 2O, CaO and other metallic oxides. The precursor Fe 1- x O is stable in kinetics under the existence of the precursors, although it is unstable in thermodynamics below 843 K. The reduced A301 catalyst has good heat resistance. The activity can be recovered completely in case of short period poison by carbon monoxide, but can not be recovered when the catalyst is poisoned by sulphur and its compounds. The purification of synthesis gas, especially desulphurization and deoxidation, is a key to ensure the stable performance and NH 3 production capacity of A301 catalyst.
文摘The activity, specific rate of reaction and usable ratio of inner surface (URIS) for commercial A301 ammonia catalyst were measured in a tube packed bed reactor. The reaction conditions were: pressure of 7.0 , 10.0 and 15.0?MPa, temperature of 325—450?℃, space velocity of 6000, 8000 and 10000?h -1 and particle size of 0.6—0.9,1.6—2.5,2.5—3.0, 3.0—4.0 and 4.0—6.7 mm. The outlet ammonia concentration, specific rate and URIS decreased with increasing particle size. URIS of commercial catalyst depended not only on particle size, but also on temperature and catalyst efficiency. Particle size was the most important factor for URIS. With increasing particle size from 0.6—0.9?mm to 4.0—6.7?mm, URIS of catalyst decreased from 1 to 0.74—0.80. For the same size range of catalyst,URIS depended on temperature and catalyst efficiency. Above the temperature of 350?℃,catalyst efficiency and URIS increased with rising temperature. But below 350?℃,URIS increased with the decrease of temperature.
