Effect of the catalyst in fluid bed catalytic hydropyrolysis

Abstract

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New insights into the effect of pressure on catalytic hydropyrolysis of biomass

“…The beech wood was analyzed by Celignis Analytical (analysis P10) and consisted of 24 wt.% db lignin, 40 wt.% db cellulose, 18 wt.% db hemicellulose, 3 wt.% db other polysaccharides, 3 wt.% db extractives and 12 wt.% db unknown. A detailed elemental composition of the biomass, including the ash composition, can be found elsewhere [20].…”

“…An extruded NiMo/Al2O3 catalyst was used in the HDO reactor, and was used as received. Both catalysts were supplied by Haldor Topsøe A/S and were also used in our previous work [20]. These two catalysts were chosen due to their well-known activity in HDO reactions [21][22][23][24][25][26][27][28][29][30], where the NiMo catalyst mainly promotes the removal of oxygen from phenols after it has saturated the aromatics (HDO pathway), while the CoMo to a larger extent promotes the direct removal of oxygen from phenol (DDO pathway) [27,[31][32][33][34].…”

“…In our previous study [20] we investigated the effect of pressure and temperature on catalytic hydropyrolysis of beech wood using a two-reactor system, where the catalytic hydropyrolysis took place in a fluid bed reactor with a sulfided CoMo/MgAl2O4 catalyst followed by a fixed bed reactor with a sulfided NiMo/Al2O3 catalyst. Operating the fluid bed reactor at 450 °C and varying the total pressure between 16 and 36 bar did not have an impact on the condensed organics and C4+ gas yield [20]. The spent catalysts were not investigated.…”

The Influence of Active Phase Loading on the Hydrodeoxygenation (HDO) of Ethylene Glycol over Promoted MoS2/MgAl2O4 Catalysts

“…Catalytic hydropyrolysis is an efficient process for the direct production of diesel and gasoline type fuels from solid lignocellulosic biomass such as wood and agricultural residues [1][2][3][4][5]. Such fuels are necessary to reach the goal of becoming independent of fossil fuels, especially in the heavy duty and aviation sector, which are not immediately moving towards electrification.…”

Hydrodeoxygenation (HDO) of Aliphatic Oxygenates and Phenol over NiMo/MgAl2O4: Reactivity, Inhibition, and Catalyst Reactivation

“…More advanced techniques than one-step bio-oil upgrading are more promising. One option is to perform the HDO step in situ during fast pyrolysis as catalytic fast hydropyrolysis in a fluid bed reactor [4,16,[45][46][47][48][49]. In this way, reactive oxygenates can be upgraded immediately once they are formed, and more stable compounds such as phenols, can be deoxygenated downstream.…”