Abstract
Abstract4‐O‐5 diaryl ether owns the strongest aryl−aryl ether bond of the abundant Caryl−O bonds in lignin. Selective hydrodeoxygenation (HDO) of diaryl ethers to oxygen‐free aromatics and alkanes has been achieved over nickel nanoparticles supported on Zr‐doped niobium phosphate solid acids in an autoclave under the mild conditions. Py‐IR, NH3‐TPD and TEM techniques were conducted to investigate the surface acidity and metal particle distribution of as‐synthesized catalysts. Nickel on Zr‐doped niobium phosphate exhibited an excellent activity for 84 % conversion of diaryl ether and a better selectivity of oxygen‐free aromatic about 62 % and the total HDO selectivity reached up to 92 % at 220 oC and 0.5 MPa, which is attributed to the favorable synergetic catalytic effect between acid sites and metal sites. In addition, higher reaction temperature favors the production of oxygen‐free aromatics and alkanes and low H2 pressure is benefit for formation of benzene.
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