BTX from the gas-phase hydrodeoxygenation and transmethylation of guaiacol at room pressure

Vapor‐Phase Hydrodeoxygenation of Guaiacol to Aromatics over Pt/HBeta: Identification of the Role of Acid Sites and Metal Sites on the Reaction Pathway

“…[34] Isomers of methylcatehol were the majorp roducts on bare HBEA with al ow conversion of < 5%.Awide range of products was observedo nP t/HBEA, and only 3-5 %w as deoxygenated to aromatics. Similarly,o nF e ÀNi/HBeta at 250-400 8Ca nd atmospheric pressure [29] and Ni-Fe/zeolitec atalysts at 350-450 8Cand 1.5-17 bar [35] alow degree of deoxygenation to aromatics was achieved. These preliminarys tudies suggest that guaiacol undergoes transalkylation and demethylation followed by deoxygenation to benzene and toluene.S urprisingly, cyclopentanone was an important product besides catechol and phenol over Pt/MgO [36,37] and Pt/C [38] catalysts at 300 8C and atmospheric pressure.…”

“…A wide range of products was observed on Pt/HBEA, and only 3–5 % was deoxygenated to aromatics. Similarly, on Fe−Ni/HBeta at 250–400 °C and atmospheric pressure and Ni‐Fe/zeolite catalysts at 350–450 °C and 1.5–17 bar a low degree of deoxygenation to aromatics was achieved. These preliminary studies suggest that guaiacol undergoes transalkylation and demethylation followed by deoxygenation to benzene and toluene.…”

“…[6][7][8][9][10][11] Among those catalysts, bifunctionalz eolite-supported metal catalysts have attracted significant attention. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] Most studies on the hydrodeoxygenation (HDO)o fg uaiacol over metal/zeolite catalysts have been performed in the liquid phase,t hat is, at al ow temperature( < 250 8C) and high pressure of H 2 (several MPa). [14,[17][18][19][20] Under these conditions, the reactionp roceeds through ah ydrogenation-deoxygenation (HYD) path in ab ifunctional manner: the saturationo ft he phenyl ring on metal sites, followed by dehydration on acid sites.…”

Noble Metal Supported on Activated Carbon for “Hydrogen Free” HDO Reactions: Exploring Economically Advantageous Routes for Biomass Valorisation

“…Hydrodeoxygenation of bio‐oil from pyrolysis of lignin, and lignin model compounds in particular is currently gaining intensive research attention. Typically, liquid‐phase hydrodeoxygenation involves treatment with high pressure (50–100 bar) at high temperature (250–500 °C) in a solvent (mainly polar protic and non‐polar solvent) with H 2 supply . The “Achilles Heel” of this approach is the supply of H 2 ‐an expensive resource which imposes a tremendous economic limitation to the implementation of HDO in large scale production units.…”

“…Typically, liquid-phase hydrodeoxygenation involves treatment with high pressure (50-100 bar) at high temperature (250-500°C) in a solvent (mainly polar protic and non-polar solvent) with H 2 supply. [5] The "Achilles Heel" of this approach is the supply of H 2 -an expensive resource which imposes a tremendous economic limitation to the implementation of HDO in large scale production units. Moreover, H 2 exhibits potential safety hazard in transportation and operation processes due to its flammability.…”