Abstract
Catalytic hydropyrolysis via the introduction of external hydrogen into catalytic pyrolysis process using hydrodeoxygenation catalysts is one of the major approaches of bio-oil upgrading. In this study, hydrodeoxygenation of acetone over Mo/HZSM-5 and HZSM-5 were investigated with focus on the influence of hydrogen pressure and catalyst deactivation. It is found that doped MoO3 could prolong the catalyst activity due to the suppression of coke formation. The influence of hydrogen pressure on catalytic HDO of acetone was further studied. Hydrogen pressure of 30 bar effectively prolonged catalyst activity while decreased the coke deposition over catalyst. The coke formation over the HZSM-5 and Mo/HZSM-5 under 30 bar hydrogen pressure decreased 66% and 83%, respectively, compared to that under atmospheric hydrogen pressure. Compared to the test with the HZSM-5, 35% higher yield of aliphatics and 60% lower coke were obtained from the Mo/HZSM-5 under 30 bar hydrogen pressure. Characterization of the spent Mo/HZSM-5 catalyst revealed the deactivation was mainly due to the carbon deposition blocking the micropores and Bronsted acid sites. Mo/HZSM-5 was proved to be potentially enhanced production of hydrocarbons.
Highlights
Lignocellulosic biomass, as a potentially CO2 neutral energy source, has gained widespread attention [1]
We conducted the catalytic HDO experiments using acetone as mode compound to investigate the role of dispersed MoO3 in the hydrodeoxygenation process over Mo/HZSM-5
We found that under atmospheric hydrogen pressure, doped
Summary
Lignocellulosic biomass, as a potentially CO2 neutral energy source, has gained widespread attention [1]. The bio-oil, produced from biomass fast pyrolysis, has a number of undesirable properties such as low stability, low heating value and high acidity [3,4]. These disadvantages are mainly caused by the high oxygen content of biomass, which hinders the crude bio-oil from integrating with the downstream upgrading process [5]. Catalytic pyrolysis using some deoxygenated catalysts such as zeolites is an attractive approach to remove excessive amount of oxygen [6,7,8]. Deoxygenation is normally occurred by the formation of CO and CO2 , which results to the carbon lose during the catalytic pyrolysis process. A significant amount of coke formation has been reported due to the hydrogen deficient nature
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