Application of magnesium oxide in ruthenium based ammonia decomposition hydrogen production catalysts

In order to overcome the drawbacks of poor catalytic activity and stability of ruthenium based ammonia decomposition hydrogen production catalysts in existing technologies under medium and low temperature conditions,a ruthenium based ammonia decomposition hydrogen production catalyst is provided for the application of ammonia decomposition to produce carbon free hydrogen gas.

In order to overcome the drawbacks of poor catalytic activity and stability of ruthenium based ammonia decomposition hydrogen production catalysts in existing technologies under medium and low temperature conditions,a ruthenium based ammonia decomposition hydrogen production catalyst is provided for the application of ammonia decomposition to produce carbon free hydrogen gas.For this purpose,a ruthenium based ammonia decomposition hydrogen production catalyst is provided,comprising an active component,a promoter,and a carrier.The active component is ruthenium,the promoter is cesium and/or potassium,and the carrier comprises a composite carrier of metal oxides and activated carbon.The metal oxides include magnesium oxide,cerium oxide,molybdenum oxide,tungsten oxide,barium oxide,and alkali metal oxides.

The present invention provides a ruthenium based catalyst for ammonia decomposition to produce hydrogen.Furthermore,by using a specific proportion of magnesium oxide,activated carbon,cerium oxide,molybdenum oxide,tungsten oxide,potassium oxide,barium oxide,and alkali metal oxides as carriers,the stability of the carrier can be improved while reducing carbon content.At the same time,it can promote ammonia decomposition to produce hydrogen,improve catalytic activity,and make the dispersion of the active ingredient ruthenium reach more than 50%.
The magnesium oxide supported ruthenium catalyst for ammonia decomposition hydrogen production uses magnesium oxide as the carrier and metal ruthenium as the active ingredient.Ruthenium particles are uniformly dispersed on the surface of magnesium oxide,with ruthenium content accounting for 0.5%to 10 wt%of the total weight of the catalyst.The present invention utilizes a precipitation deposition method to prepare a precursor of magnesium oxide supported ruthenium catalyst.The resulting product is washed,dried,and then reduced under a reducing atmosphere to obtain a highly dispersed magnesium oxide supported ruthenium catalyst.The preparation method of the present invention is simple,using low-cost magnesium oxide as a carrier.The prepared magnesium oxide supported ruthenium catalyst has the advantages of good metal dispersion,high catalytic activity,and good stability,and can be used for catalyzing the ammonia decomposition hydrogen production process.