. 2018 May 29;8(35):19499–19511. doi: 10.1039/c8ra03623c

List of catalysts and associated pre- and post-processing conditions for different catalysts.

Catalyst^a	Solution aging time (h)	Calcination time (h)
CuO(A_{0 h}–C_{2 h})	None	2 h
CuO(A_{2 h}–C_{2 h})	2 h	2 h
CuO(A_{24 h}–C_{2 h})	24 h	2 h
CuO(A_{24 h}–C_{1 h})	24 h	1 h
CuO(A_{24 h}–C_{4 h})	24 h	4 h
CuO(A_{72 h}–C_{2 h})	72 h	2 h

For all catalysts, urea-hydrolysis was carried out for 2 h at 90 °C and calcination was performed in ambient air at 400 °C with temperature ramp of 5 °C min⁻¹.