After the port type has been changed from Ethernet to FC, the FC port will not be enabled on the switch until FCOE feature is enabled:
N5K(config)#feature FCOE
C license checked out successfully
fc_plugin extracted successfully
FC plugin loaded successfully
FCoE manager enabled successfully
FC enabled on all modules successfully
Enabled FCoE QoS policies successfully
After that, we verify that the port type is changed successfully and the FC ports appear on the switch:
N5K# show interface brief