Progress in (catalytic) pyrolysis of industrial lignin from 2015 to 2021^a.

Raw material	Lignin type	Reactor type	Reaction temperature (°C)	Yield (wt%)	Main products after degradation	Ref.
Corncob residue	OL	Fixed bed reactor	350	16.2 (Monomer)	H, MV	53
Cork	AL	Fixed bed reactor	650	54 (Bio-oil)	Aromatics	54
Douglas fir, radial pine	AL	Vertical pyrolysis furnace	600	5.02 (Monomer)	P, C	55
Corn cob	HL			20.48 (Monomer)
—	AL	Microwave reactor	—	3.36 (±0.40)	P	56
				0.51	C
				1.84	Methoxyphenol
				0.50 (±0.04)	BTEXS
—	AL	Pyrolysis gas chromatography/mass spectrometry	800	51.39 (Monomer)	P, C, dimethylphenol	57
				20.83 (Monomer)
				18.01 (Monomer)
Corn straw	AL	Fixed bed reactor	450	29 (Bio-oil)	H, MV	58
Radial pine	AL	Fluidized bed reactor	475	4.3 (Monomer)	G, eugenol	59
			525	6.8 (Monomer)	Alkylphenol, C
			575	12.0 (Monomer)	Aromatics
Maple	AHL	Pyrolysis gas chromatography/mass spectrometry	550	17.87	D	60
			650	14.47
			550	13.05	Isoeugenol
			650	14.14
Straw			800	8.87	T
			900	8.55
Rice husk			800	7.73	T
			900	9.47
—	KL	Fixed bed reactor	500	∼32 (Bio-oil)	Alkylphenol, aromatics, BTEX	61
			600	Selectivity 14.56	BTEX
				Selectivity 13.35	Other aromatics, etc.
Birch and poplar mixed	—	Fixed bed reactor	500	15.29 (Monomer)	Phenolic aromatic hydrocarbon	62
Eucalyptus				12.57 (Monomer)
Black liquor	AL	Fixed bed reactor	600	20.34 (Bio-oil)	Monomer aromatics, polycyclic aromatic hydrocarbons, phenols	63
Corn cob	AHL	Fixed bed reactor	550	28.30	B, T, xylene	64

^aHL: hydrolyzed lignin.