B204 Low Temperature Shift Catalyst

تاريخ نشر الاعلان : في
5 th ,April,2014
- الصين, Shanghai
بيانات الاتصال العنوان و تفاصيل الاتصال
B204 is one kind of low temperature shift catalysts
1.1. Introduction
B204 is one kind of low temperature shift catalysts - which help to convert CO and H2O into CO2 and H2 in feed gas in the range of 180~260°C.
B204 is an energy-saving catalyst - and it shows outstanding advantages of good activity in low temperature and excellent selectivity under low steam gas ratio condition(~0.3).
B204 is used for accelerating the reaction of CO with H2O to produce CO2 and H2at low temperature of 180~260°C:
Main reaction: CO+H2O ? CO2+H2 ?H2980= -41KJ/mol
Side reaction: CO+2H2 ?CH3OH ?H2980= -90.64KJ/mol
2. Composition and properties:
Appearance black cylinder
Size (mm) F5´(4.5-5.5)
Bulk density(kg/l) 1.3~1.5
CuO 37.5±3.5
ZnO 37.5±3.5
3. Charging
1)Place ط15~25mm aluminum balls or ceramic bals in the top and bottom of catalyst bed - and set wire screen between catalyst and aluminum balls or ceramic balls.
2)The catalyst should not have a free fall of more than 50~100cm.
3)The catalyst must be distributed evenly as the bed is loaded.
4)Operators inside the vessel should wear dust-prevention mask - helmet and air breathing apparatus and stand on a wooden board. To stand on the catalyst directly - stacking the catalyst on one fixed point and then distribute evenly is not allowed.
5)Record the charging level during charging and adjust loading density accordingly.
4. Reduction of LTS catalsyt
5.1 Reduction reaction
Low temperature shift catalyst are supplied in the oxide form and they must be reduced to matellic copper - which is the active species - before they are used.
5. Shut down and Discharging
Shut down
a.During plant shut down period process gas must be purged reactor to avoid the condensation of water on the catalyst.
b. For short or long time shut down but no need of open reactor should purge the reactor with nitrogen.
c. The operation procedure of passivation is same as new.
d. Re start up a cool reactor should pre heat it to above dew point with nitrogen and then introduce process gas.
a. Reduce the pressure in the reactor to atmosphere and decrease temperature to about 150°C.
b. Purge reactor with steam or nitrogen until hydrogen is less than 0.1%.
c. Mix oxygen about 0.1~0.5% and temperature rise no more than 50°C - then increase oxygen content gradually until reactor fill with air.
d. The catalyst is passviated complete and catalyst can be unloaded
6. The method to prolong LTS catalyst lift time
l good reduction operation
lower T - lower H2 - lower P - more high Vs
the influence of reduction T to LTS performance
Cu crystal
T °C
Cu - إ
T °C
Conversion ratio %
l prevent poison
Prevent S - Cl from feed gas
The activity decrease to 50% when S content reach to 0.25% or Cl 0.15% in LTS catalyst.
Demand:S < 0.1ppm - Cl < 0.03ppm.
Prevent decarbonization lye
l Prevent condensation of steam to water
l Prevent operation in high temperature
7.Catalyst storage
The catalyst should be packed in steel drums with plastic bags;
In transportation and storage catalyst should be protected against rain and standing water. For long time storage they should be kept under cover and away from damp walls and floors. The lids should be left on the drums until just before the catalyst is to be charged. If the lids are removed it is important that drums should be recovered as soon as possible.
Used catalyst should be packed properly to dispose off.

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