Actually I think more specifics are required; however, it appears to be a catalyst since the OH^- is used but regenerated in the next reaction. You have missed a negative sign on the OH^- in the first equation.
NH2NO2+OH-->I need to help in this equation ... the full mecanism of nitramid with oH catalyst
No, the reaction you provided is not a catalyst. A catalyst is a substance that speeds up a chemical reaction without being consumed in the process. In the given reaction, NH2NO2 and OH react to form H2O and NHNO-2, and then NHNO-2 decomposes into N2O and OH-. In this case, NH2NO2 and OH are the reactants, and N2O and OH- are the products. There is no substance present in the reaction that is facilitating the reaction without being consumed.
