Table 11. Promoted Ni-Al₂O₃ Catalysts Reported in the Literature for the Pyrolysis and In-line Steam Reforming of Plastic Wastes.

Catalyst	Feed	Preparation methoda	Reactor configuration	Operating conditionsb	H2 conc. (vol %)	H2 prod. (wt %)	Ref.
10Ni/La2O3-Al2O3	PP	wi	spouted/fluidized (0.75 g min–1)	TP = 500 °C	71.2	34.9	Arregi et al.55
				TR = 700 °C
				S/C = 3.1
10Ni/CeO2-Al2O3	PP	wi	spouted/fluidized (0.75 g min–1)	TP = 500 °C	71.1	33.7	Arregi et al.55
				TR = 700 °C
				S/C = 3.1
10Ni/CeO2-Al2O3	PP	wi	fixed/fixed (1 g)	TP = 500 °C	63.8	19.5	Wu and Williams164
				TR = 800 °C
				steam = 4.74 g h–1
Ni-Ce-Al 1:1:1	PP	cp	fixed/fixed (2 g)	TP = 500 °C	55.6	12.6	Nahil et al.197
				TR = 800 °C
				steam = 4.74 g h–1
Ni-Mg-Al 1:1:2	PP	cp	fixed/fixed (1 g)	TP = 500 °C	61.8	22.3	Wu and Williams164
				TR = 800 °C
				steam = 4.74 g h–1
Ni-Mg-Al 1:1:1	PP	cp	fixed/fixed (1 g)	TP = 500 °C	65.0	26.6	Wu and Williams47
				TR = 800 °C
				steam = 4.74 g h–1
Ni-Mg-Al 1:1:1	PS	cp	fixed/fixed (1 g)	TP = 500 °C	58.7	18.5	Wu and Williams47
				TR = 800 °C
				steam = 4.74 g h–1
Ni-Mg-Al 1:1:1	HDPE	cp	fixed/fixed (1 g)	TP = 500 °C	65.0	26.0	Wu and Williams47
				TR = 800 °C
				steam = 4.74 g h–1
Ni-Mg-Al 1:1:1	PP: 26.9 wt %	cp	fixed/fixed (1 g)	TP = 500 °C	66.3	25.3	Wu and Williams47
	PS: 16.8 wt %			TR = 800 °C
	HDPE: 56.3 wt %			steam = 4.74 g h–1
Ni-Mg-Al 1:1:1	real-world plastics (RP)	cp	fixed/fixed (1 g)	TP = 500 °C	67.5	23.6	Wu and Williams47
				TR = 800 °C
				steam = 4.74 g h–1
Ni-Mn-Al 1:1:1	PP	cp	fixed/fixed (2 g)	TP = 500 °C	62.7	14.3	Nahil et al.197
				TR = 800 °C
				steam = 4.74 g h–1
Ni-Ca-Al 1:1:1	PP	cp	fixed/fixed (2 g)	TP = 500 °C	58.3	13.7	Nahil et al.197
				TR = 800 °C
				steam = 4.74 g h–1
Ni-Zn-Al 1:1:1	PP	cp	fixed/fixed (2 g)	TP = 500 °C	52.7	9.2	Nahil et al.197
				TR = 800 °C
				steam = 4.74 g h–1

^awi, Wet impregnation; cp, co-precipitation.

^bT_P = Pyrolysis temperature; T_R = reforming temperature.