Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 155, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2021.105079
Keywords
Bio-oil; Catalytic upgrading; HZSM-5; Cu modification; Fast pyrolysis; Aromatic hydrocarbons
Funding
- Hirosaki University Fund
- Ministry of Education, Culture, Sport, Science and Technology (MEXT) of Japan
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Cu-modified HZSM-5 catalyst showed improved catalytic performance in upgrading bio-oil, with higher aromatic hydrocarbons yield attributed to suitable acidity and optimal Cu loading amount. Moreover, the catalyst exhibited excellent reusability and regeneration property.
Commercial HZSM-5 zeolite (Si/Al = 24) was modified with Cu species using the wet impregnation method, and applied in the in-situ upgrading of bio-oil from the fast sunflower stalk pyrolysis with a catalyst to biomass ratio of 1:1 at 500 ?C. The main objective was to study the Cu doping effect on the HZSM-5 catalytic performance in terms of the selectivity to aromatic hydrocarbons (especially the specific aromatic hydrocarbons including benzene, toluene and xylene) yield. It was found that Cu/HZSM-5 with low Cu loading amounts preserved HZSM5 crystalline structure as well as its acid sites. The HZSM-5 with 0.5 wt.% Cu loading amount exhibited the best catalytic performance with a high relative amount of aromatic hydrocarbons of 73.2 % and a yield of specific aromatic hydrocarbons as high as 56.5 mg/g-biomass (d.a.f), which were much higher than those based on the parent HZSM-5 (55.0 % and 26.0 mg/g-biomass (d.a.f)). It should be mainly attributed to its suitable acidity and best textural properties for the deoxygenation of the bio-oil thanks to the optimum Cu loading amount. In addition, the 0.5 wt.% Cu loaded HZSM-5 catalyst also showed excellent catalytic reusability and regeneration property, and the spent catalyst was easily recovered by a simple calcination in air for a short time.
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