We all know that the mass transfer of hydrogen on the catalyst surface is a key factor in controlling the reaction rate and is directly related to the hydrogen partial pressure. We then explored the effect of different hydrogen pressures on the hydrogenation of BN (Fig. ). From the initial test of 0.5 MPa, the reaction showed a satisfactory yield. With the increase in pressure, the conversion rate and selectivity did not change significantly. We know that the mass transfer of hydrogen is not an absolute factor limiting the reaction rate. The reaction can proceed at a lower pressure, which lays a certain foundation for the hydrogenation of nitrile compounds under mild conditions in continuous flow.