Performance of mesoporous ZSM-5 in deoxygenation of straw derived pyrolysis vapors

Andreas Eschenbacher, Peter A. Jensen, Ulrik B. Henriksen, Jesper Ahrenfeldt, Uffe V. Mentzel, Anker D. Jensen

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Abstract

In order to allow processing of biomass derived fast pyrolysis oils in oil refineries, reduction of the oil`s oxygen content and acid number is required [1]. Deoxygenation can be obtained by direct upgrading of the pyrolysis vapors over solidacid catalysts. A close coupled process operating at temperature and pressure conditions close to those for optimum liquidyields in pyrolysis units offers potential economic advantages over high pressure hydrotreating [2]. To date, the mediumpore size ZSM-5 zeolite provides a high aromatic yield and the least amount of coke in upgrading of pyrolysis vapors [3]. However, the coke caused by reactive pyrolysis vapors causes a rapid decay in site accessibility and requires frequent regeneration to recover activity. In addition, irreversible dealumination can be caused by steam from the pyrolysis process,the dehydration reactions during upgrading and the steam produced during oxidative regeneration. We address the reversible deactivation due to coke by introducing an auxiliary mesopores network to improve the accessibility and prolong the zeolite's active time on stream. In order to reduce the irreversible deactivation, the zeolites acid site strength and density have been balanced with modifications by phosphorous stabilization.
Original languageEnglish
Publication date2018
Number of pages1
Publication statusPublished - 2018
EventThermal & Catalytic Sciences Symposium (TCS 2018) - Auburn University Hotel and Conference Center, Auburn, United States
Duration: 8 Oct 201810 Oct 2018

Conference

ConferenceThermal & Catalytic Sciences Symposium (TCS 2018)
LocationAuburn University Hotel and Conference Center
Country/TerritoryUnited States
CityAuburn
Period08/10/201810/10/2018

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