TY - JOUR
T1 - Understanding the impact of aluminum oxide binder on Ni/HZSM-5 for phenol hydrodeoxygenation
AU - Zhao, Chen
AU - Yu, Yanzhe
AU - Jentys, Andreas
AU - Lercher, Johannes A.
N1 - Funding Information:
This work was supported by the Technische Universität München in the framework of the European Graduate School for Sustainable Energy. The authors thank H. Shi for the TEM, X. Hecht for BET, and M. Neukamm for AAS measurements. We also thank HASYLAB, Hamburg, Germany for providing beam time to measure the EXAFS and XANES experiments.
PY - 2013/3/7
Y1 - 2013/3/7
N2 - The properties of supported Ni particles on HZMS-5 and Al2O3-HZSM-5 were comparably investigated by diverse characteristic techniques. Ni/Al2O3-HZSM-5 had at least three times higher concentrations of accessible Ni atoms (average diameter Ni0: 8.8nm) compared to Ni/HZSM-5 (average diameter Ni0: 35nm), which are consistently evidenced by TEM and XRD as well as H2 chemisorption and IR spectra of adsorbed CO. The Ni nanoparticles interacted strongly with the binder through the interaction between NiO and Al2O3, explored by the combined extended X-ray absorption fine structure (EXAFS), X-ray absorption near edge structure (XANES), and H2 temperature-programmed reduction (TPR) techniques. The Brønsted acid sites on two supports probed by IR of adsorbed pyridine were similar, but Lewis acid sites contributed by the γ-Al2O3 were more abundant on Al2O3-HZSM-5. The acid sites of the two catalysts responded differently to metal incorporation and subsequent treatments, reflecting changes in Al environments illuminated by 27Al MAS NMR. In situ IR spectra of adsorbed species demonstrates that Al2O3-HZSM-5 has higher adsorption capacity for phenol, cyclohexanone, and cyclohexanol due to stronger adsorption of these compounds on the γ-Al2O3 binder.
AB - The properties of supported Ni particles on HZMS-5 and Al2O3-HZSM-5 were comparably investigated by diverse characteristic techniques. Ni/Al2O3-HZSM-5 had at least three times higher concentrations of accessible Ni atoms (average diameter Ni0: 8.8nm) compared to Ni/HZSM-5 (average diameter Ni0: 35nm), which are consistently evidenced by TEM and XRD as well as H2 chemisorption and IR spectra of adsorbed CO. The Ni nanoparticles interacted strongly with the binder through the interaction between NiO and Al2O3, explored by the combined extended X-ray absorption fine structure (EXAFS), X-ray absorption near edge structure (XANES), and H2 temperature-programmed reduction (TPR) techniques. The Brønsted acid sites on two supports probed by IR of adsorbed pyridine were similar, but Lewis acid sites contributed by the γ-Al2O3 were more abundant on Al2O3-HZSM-5. The acid sites of the two catalysts responded differently to metal incorporation and subsequent treatments, reflecting changes in Al environments illuminated by 27Al MAS NMR. In situ IR spectra of adsorbed species demonstrates that Al2O3-HZSM-5 has higher adsorption capacity for phenol, cyclohexanone, and cyclohexanol due to stronger adsorption of these compounds on the γ-Al2O3 binder.
KW - Al and Si MAS NMR
KW - AlO binder
KW - EXAFS
KW - XANES
UR - http://www.scopus.com/inward/record.url?scp=84871652981&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2012.11.042
DO - 10.1016/j.apcatb.2012.11.042
M3 - Article
AN - SCOPUS:84871652981
SN - 0926-3373
VL - 132-133
SP - 282
EP - 292
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -