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The Pt‐Enriched PtNi Alloy Surface and its Excellent Catalytic Performance in Hydrolytic Hydrogenation of Cellulose
Author(s) -
Liang Guanfeng,
He Limin,
Arai Masahiko,
Zhao Fengyu
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201301204
Subject(s) - catalysis , microcrystalline cellulose , cellulose , hydrolysis , bimetallic strip , x ray photoelectron spectroscopy , high resolution transmission electron microscopy , chemistry , adsorption , temperature programmed reduction , fourier transform infrared spectroscopy , desorption , thermal desorption spectroscopy , nuclear chemistry , inorganic chemistry , materials science , chemical engineering , organic chemistry , nanotechnology , transmission electron microscopy , engineering
Ni‐based catalysts are currently a subject of intense research in the hydrolytic hydrogenation of cellulose. We previously reported that Ni/ZSM‐5 catalyst gave high yield of hexitols. However, Ni‐based catalysts suffered fast deactivation in hot‐compressed water. In this follow‐up study we designed highly active Ni‐based bimetallic catalysts with excellent hydrothermal stability for the hydrolytic hydrogenation of microcrystalline cellulose. PtNi/ZSM‐5 shows a 76.9 % yield of hexitols, which is the best obtained so far in the hydrolytic hydrogenation of microcrystalline cellulose over Ni‐based catalysts. Furthermore, the yield of hexitols remained greater than 55 % after the catalyst was reused for 4 times. The results showed that PtNi nanoparticles were formed with a Pt‐enriched alloy surface as confirmed by XRD, H 2 ‐TPR (temperature‐programmed H 2 reduction), XPS (X‐ray photoelectron spectroscopy), and H 2 ‐TPD (temperature‐programmed H 2 desorption). The surface features of these nano‐particles were characterized by CO‐TPD (temperature‐programmed CO desorption), CO‐FTIR (CO adsorption FTIR spectroscopy), HRTEM (high resolution TEM), and O 2 ‐TPO (temperature programmed oxidation) and this special surface structure may be responsible for the high activity, selectivity, and stability in the hydrolytic hydrogenation of cellulose in hot‐compressed water.