CONFERENCIA: «Toward a control of distribution of Al atoms in zeolite framework» por Dr. Toshiyuki Yokoi
El miércoles 13 de marzo, se llevará a cabo a las 12:00h en el Salón de Actos del ITQ, la conferencia «Toward a control of distribution of Al atoms in zeolite framework» por el Dr. Toshiyuki Yokoi, de TITECH de Tokio (Tokyo Institute of Technology)
Dr. Toshiyuki Yokoii
Nanospace Catalysis Unit, Institute of Innovative Research, Tokyo Institute of Technology
4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
I received a Ph.D. in 2004 from Yokohama National University, under the supervision of Prof. Tatsumi. Soon afterwards, I became a postdoctoral fellow in his group. Thereafter, I moved to The university of Tokyo and worked as an Assistant Professor of Professor Tatsuya Okubo from 2004 to 2006. I returned to the Tatsumi’s group in Catalytic Chemistry Division, Chemical Resources Laboratory, Tokyo Institute of Technology as an Assistant Professor in 2006. I was promoted to associate Professor in 2018. By the end of 2017, I will publish over 150 refereed papers. I first succeeded in synthesizing mesoporous silica by using anionic surfactant (Nature Mater. , 2004). I also succeeded in preparing the colloidal crystal of silica nanospheres 10 nm in size by using basic amino acids (J. Am. Chem. Soc., 2006, 128, 13664-13665).
I developed the preparation of the RTH-type zeolite without using organic-structure-directing agents (Angew. Chem. Int. Ed., 2009, 48, 9884-9887). Recently, I successfully developed a new catalyst for the MTO reaction with a high performance based on the CON-type zeolite (ACS Catalysis, 2015, 5, 4268–4275). Now, I am tackling the synthesis of zeolite with the T sites in the framework occupied by active elements, e.g., Al atoms, controlled (J. Phys. Chem. C, 2015, 119, 15303–15315).These achievements were nationally recognized and I was given the Japan Petroleum Institute Award for Encouragement of Research and Development in 2011 and the Catalysis Society of Japan Young Researcher’s Award in 2012.Since 2018, I have been an associate Professor, and a research unit leader of “Nanospace Catalysis Unit”, Institute of Innovative Research, Tokyo Institute of Technology. This unit focuses on nanospace materials such as zeolite and mesoporous materials, and aims to create nanospace catalyst that can make efficient use of diverse resources on the planet and that can contribute to the development of green production of chemical feedstocks and value-added chemicals
Toward a control of distribution of Al atoms in zeolite framework
The acidic properties of aluminosilicate-type zeolites originate from the presence of protons balancing the negative charge induced by the framework Al atoms in tetrahedral sites (T sites). The catalytic properties of zeolites depend on various factors such as pore structure, acid strength and acid amounts. In addition to these factors, recently, the location and distribution of Al atoms in the zeolite framework have been recognized as an important factor for activity and selectivity, because they would profoundly affect the accessibility of molecules to acid sites and the spatial constraints of the reaction field in the pores. Although zeolite researchers have seriously tackled the estimation of the distribution of framework Al atoms and their control in the framework, thus challenging issues have not been completely resolved to date . We have developed a method for varying the distribution of Al atoms in the MFI framework, by choice of the cations, in particular OSDAs used . Very recently, we have found a new class of ZSM-5 zeolite with Al atoms preferentially located at straight and sinusoidal channels by using pentaerythritol (PET) in combination with Na cation ([PET+Na]) (Fig. 1) [3-5].
Fig. 1 Strategy for preferential distribution of the Al atoms in narrow straight and/or sinusoidal channels of the MFI framework.
The CHA-type zeolites including chabazite, SAPO-34, SSZ-13, etc. have attracted much attention in expectation of selective catalysis. Recently, we have found a facile method for controlling the Al distribution in the CHA-type zeolite by varying the starting materials including fumed silica, aluminum hydroxide, the FAU-type zeolite .
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- Yokoi, H. Mochizuki, S. Namba, J.N. Kondo, T. Tatsumi, J. Phys. Chem. C, 119 (2015) 15303-15315.
- Yokoi, H. Mochizuki, T. Biligetu, Y. Wang, T. Tatsumi, Chem. Lett., 46 (2107) 798-800.
- Biligetu, Y. Wang, T. Nishitoba, R. Otomo, S. Park, H. Mochizuki, J.N. Kondo, T. Tatsumi, T. Yokoi, J. Catal., 353 (2107) 1–10.
- Park, T. Biligetu, Y. Wang, T. Nishitoba, J.N. Kondo, T. Yokoi, Catalysis Today, 303 (2018) 64-70.
- Nishitoba, N. Yoshida, J.N. Kondo and T. Yokoi, Ind. Eng. Chem. Res., 57 (2018) 3914–3922.