Molybdenum Nitride-based Catalyst And Dielectric Barrier Discharge Plasma Co-catalyzed Ammonia Decomposition To Produce Hydrogen

At present,the shortage of fossil energy and environmental pollution constantly promote the development of sustainable clean energy,among which hydrogen energy is favored because of its environmental friendliness and high calorific value.From the perspective of hydrogen storage,ammonia is an ideal hydrogen storage material,which not only has high molecular hydrogen content,but also is easy to be liquefied and transported.More importantly,ammonia decomposition to produce hydrogen is a "carbon-free" process.So far,there is a lack of research on the rapid decomposition of ammonia for low-cost hydrogen production.In this paper,the conversion rate of ammonia decomposition is nearly 100%by using DBD in coordination with molybdenum nitrid-based catalyst at low temperature.The results and conclusions are as follows:(1)Molybdenum nitride(Mo2N)was prepared from Molybdenum dioxide(MoO2)by temperature-programmed nitriding under atmospheric pressure.DBD plasma was used to catalyze ammonia decomposition to produce hydrogen.In the feed rate of NH3 is 40 sccm,plasma input power for 40 W and catalyst for 1 g,got 60%of the conversion rate of ammonia decomposition,and compared with molybdenum nitride thermal catalytic decomposition of ammonia conversion rate has obvious improvement,the plasma catalysis synergy effect significantly,but the decomposition of ammonia conversion rate still has room to improve.(2)By changing the catalyst synthesis conditions to adjust the catalyst structure,MoO2 as raw material in low pressure(NH3 atmosphere)through temperature-programmed nitriding method to obtain molybdenum nitride complex catalyst,and it was applied for the plasma driven ammonia decomposition of hydrogen production.It was found that ammonia conversion rate above 95%was achieved at 40 W input power without additional heating.A variety of characterization results confirmed that the surface of the catalyst obtained by low-pressure nitriding method is rich in Mo,and the presence of Mo component plays an important role in improving the performance of plasma catalytic ammonia decomposition of Mo nitride.Since Mo/Mo2N active species were generated in advance,the plasma catalyzed ammonia decomposition directly,and the reaction had no obvious induction period.In addition,the ammonia conversion rate of the optimized catalyst remained above 80%in the 48-hour test,indicating a broad application prospect.