Widening Synthesis Bottlenecks: Realization of Ultrafast and Continuous‐Flow Synthesis of High‐Silica Zeolite SSZ‐13 for NOx Removal |
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| Authors: | Zhendong Liu Prof?Dr Toru Wakihara Dr Kazunori Oshima Daisuke Nishioka Yuusuke Hotta Dr Shanmugam P Elangovan Yutaka Yanaba Prof?Dr Takeshi Yoshikawa Dr Watcharop Chaikittisilp Takeshi Matsuo Takahiko Takewaki Prof?Dr Tatsuya Okubo |
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| Institution: | 1. Department of Chemical System Engineering, The University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku, Tokyo 113‐8656 (Japan);2. Science and Technology Research Center, Mitsubishi Chemical Group, 1000 Kamoshida‐cho, Aoba‐ku, Yokohama 227‐8502 (Japan);3. Institute of Industrial Science, The University of Tokyo, 4‐6‐1 Komaba, Meguro‐ku, Tokyo, 153‐8505 (Japan) |
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| Abstract: | Characteristics of zeolite formation, such as being kinetically slow and thermodynamically metastable, are the main bottlenecks that obstruct a fast zeolite synthesis. We present an ultrafast route, the first of its kind, to synthesize high‐silica zeolite SSZ‐13 in 10 min, instead of the several days usually required. Fast heating in a tubular reactor helps avoid thermal lag, and the synergistic effect of addition of a SSZ‐13 seed, choice of the proper aluminum source, and employment of high temperature prompted the crystallization. Thanks to the ultra‐short period of synthesis, we established a continuous‐flow preparation of SSZ‐13. The fast‐synthesized SSZ‐13, after copper‐ion exchange, exhibits outstanding performance in the ammonia selective catalytic reduction (NH3‐SCR) of nitrogen oxides (NOx), showing it to be a superior catalyst for NOx removal. Our results indicate that the formation of high‐silica zeolites can be extremely fast if bottlenecks are effectively widened. |
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| Keywords: | crystal growth NOx removal heterogeneous catalysis seeded growth zeolites |
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