报告人：Krijn P. de Jong (Professor, Utrecht University）
时间：07月08日（周五） 9 : 30
地点：化学工程楼学术报告厅（203）
Abstract：
Nanostructured catalysts play a key role in processes ranging from oil refining to synthesis gas conversion. Zeolites are crystalline, microporous alumino-silicates that are widely applied in catalysis and separation. In this talk we intend to unravel the 3D nanostructure of complex zeolite catalysts using a.o. electron tomography [1, 2]. Mesoporous zeolites [2] facilitate mass transfer and restrict secondary reactions in e.g. hydrocracking. Electron tomography is used to assess the mesopore network and its consequences for catalysis [3]. Trimodal porosity combining micropores (~1 nm), small mesopores (~3 nm) and large mesopores (20-50 nm) provided unique selectivity in hydrocracking [3]. The mesoporosity and microporosity of these zeolite Y samples has been quantified using advanced image ****ysis techniques [4]. Second, platinum loaded zeolite Y crystals have been studied. These Pt/Y crystals are widely used as bi-functional catalysts. In carefully synthesized Pt/Y crystals electron tomography revealed for the first time that within one zeolite Y crystal the Pt particles of 1-2 nm in size were uniformly dispersed, however, from one crystal to another the density of Pt particles varied up to a factor of 35 [5]. Third, we have varied the Pt location in Pt/Al2O3/Y catalysts. The control, characterization and impact of the location on hydrocracking of alkanes of will be presented [6].
References:
1. H. Friedrich, P.E. de Jongh, A.J. Verkleij and K.P. de Jong, Chem. Rev. 109 (2009) 1613-1629.
2. Y. Wei, T.E. Parmentier, K.P. de Jong, J. Zecevic, Chem. Soc. Rev. 44, (2015), 7234-7264.
3. K.P. de Jong, J. Zecevic, H. Friedrich, P.E. de Jongh, M. Bulut, S. van Donk, R. Kenmogne, A. Finiels, V. Hulea and F. Fajula, Angew. Chem. Int. Ed. 49 (2010) 10074-10078.
4. J. Zecevic, C.J. Gommes, H. Friedrich, P.E. de Jongh, K.P. de Jong, Angew. Chem. Int. Ed. 51 (2012) 4213-4217.
5. J. Zecevic, A.M.J. van der Eerden, H. Friedrich, P.E. de Jongh and K.P. de Jong, ACS Nano 7 (2013) 3698-3705.
6. J. Ze？evi？, G. Vanbutsele, K.P. de Jong, J.A. Martens, Nature 528 (2015), 245-254.
