NiSx with different phase compositions were synthesized by the microwave-assisted hydrothermal method.
The phase composition of NiSx was controlled by adjusting the synthesis conditions.
The presence of NiS2 enhanced p-cresol conversion but had no effect on product distribution.
The HDO reaction mechanism could be explained with Remote Control model through the spillover hydrogen.
NiS2 exhibited better promotional effect for the HDO activity of MoS2 than NiS and Ni3S4.