Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2016-09-16

Journal: CHEMISTRYSELECT

Included Journals: SCIE

Volume: 1

Issue: 15

Page Number: 4949-4956

ISSN: 2365-6549

Key Words: aromatics; green chemistry; hydrodeoxygenation; lignin-derived 4-O-5 dimers; supported catalysts

Abstract: 4-O-5 diaryl ether owns the strongest aryl-aryl ether bond of the abundant C-aryl-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 degrees C 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 H-2 pressure is benefit for formation of benzene.