Catalyst used for Methanation process:

Catalyst used for Methanation process:

Nickel based Catalyst

The process gas composition contain small traces of CO and CO2. Removal of carbon oxide is accomplished in a methanator where CO + CO2 are converted in the presence of nickel based catalyst into CH4. The shape of the nickel based catalyst is made in a rings formation having dimensions of about 5 mm outer diameter its lifetime is expected to be about more than 10 years

CO + 3H2 ==> CH4 + H2O H = -49.2Kcal/mol

CO2 + 4H2 ==> CH4 + 2H2O H = -39.4Kcal/mol

The temperature rise foe one percent of CO converted is 74oC and for one percent of CO2 converted , it is 60oC.The performance of methanator where catalyst rx takes place is directly related to the efficiency of co-conversion and CO2 removal sections. High concentrations of carbon oxides can cause temperature runaway in the methanator catalyst and it is necessary to protect both the reactor vessel and the catalyst from serious damage. The vessel should be isolated , depressurized and purged with nitrogen. At temperature below 204^oC Nickel in presence of CO forms nickel carbonyl which is very poisonous.