Understanding the impact of aluminum oxide binder on Ni/HZSM-5 for phenol hydrodeoxygenation

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 Ni-0: 8.8 nm) compared to Ni/HZSM-5 (average diameter Ni-0 : 35 run), which are consistently evidenced by TEM and XRD as well as H-2 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 H-2 temperature-programmed reduction (TPR) techniques. The Bronsted acid sites on two supports probed by IR of adsorbed pyridine were similar, but Lewis acid sites contributed by the gamma-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 Al-27 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 gamma-Al2O3 binder. (c) 2012 Elsevier B.V. All rights reserved.     «

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 Ni-0: 8.8 nm) compared to Ni/HZSM-5 (average diameter Ni-0 : 35 run), which are consistently evidenced by TEM and XRD as well as H-2 chemisorption and IR spectra of adsorbed CO. The Ni nanoparticles interacted strongly with the binder through the interaction be...     »

ISI Document Delivery No.: 095YA Times Cited: 2 Cited Reference Count: 35 Zhao, Chen Yu, Yanzhe Jentys, Andreas Lercher, Johannes A. Jentys, Andreas/D-4622-2009 Jentys, Andreas/0000-0001-5877-5042 Technische Universitat Munchen This work was supported by the Technische Universitat Munchen 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. 2 Elsevier science bv Amsterdam     «

ISI Document Delivery No.: 095YA Times Cited: 2 Cited Reference Count: 35 Zhao, Chen Yu, Yanzhe Jentys, Andreas Lercher, Johannes A. Jentys, Andreas/D-4622-2009 Jentys, Andreas/0000-0001-5877-5042 Technische Universitat Munchen This work was supported by the Technische Universitat Munchen 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...     »