Add time:07/29/2019         Source:sciencedirect.com

Strong promoting effect of alkali metal amides, i.e., LiNH2, NaNH2 and KNH2, on the catalytic activity of MANGANESE NITRIDE (cas 12033-07-7) (MnN) for ammonia decomposition has been demonstrated, which is evidenced by ca. 100 K drop in onset temperature and by ca. 50–60 kJ mol−1 reduction in apparent activation energy as compared with the neat MnN. The order of promotion capability of alkali metal amides can be ranked as LiNH2 > KNH2 ≥ NaNH2, either in term of NH3 conversion rate or turnover frequency (TOF), which is distinctly different from that of conventional alkali metal oxides or hydroxides, i.e., K > Na > Li. This phenomenon suggests that the promoting mechanism of alkalis depends on their chemical forms. When alkalis are in the form of amide or imide, they may function as co-catalysts by participating in the catalytic circle directly rather than by executing electronic promotion influence on transition metals.

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