Widening Synthesis Bottlenecks: Realization of Ultrafast and Continuous-Flow Synthesis of High-Silica Zeolite SSZ-13 for NOx Removal

• Published in: Angewandte Chemie Vol. 127; no. 19; pp. 5775 - 5779
• Main Authors: Liu, Zhendong, Wakihara, Toru, Oshima, Kazunori, Nishioka, Daisuke, Hotta, Yuusuke, Elangovan, Shanmugam P., Yanaba, Yutaka, Yoshikawa, Takeshi, Chaikittisilp, Watcharop, Matsuo, Takeshi, Takewaki, Takahiko, Okubo, Tatsuya
• Format: Journal Article
• Language: English; German
• Published: Weinheim WILEY-VCH Verlag 04.05.2015; WILEY‐VCH Verlag; Wiley Subscription Services, Inc
• Subjects: Chemistry; Emissions; Heterogene Katalyse; Kristallkeime; Kristallwachstum; Power plants; Stickoxide; Zeolites; Zeolithe
• ISSN: 0044-8249; 1521-3757
• DOI: 10.1002/ange.201501160

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. Abkürzung gefunden: Der Zeolith SSZ‐13 dient kommerziell als Katalysator zur Entfernung von Stickoxiden (NOx), die zeitaufwändige Synthese behindert aber seine Herstellung im großen Maßstab. In einem kontinuierlichen Verfahren kann SSZ‐13 nun in nur 10 Minuten synthetisiert werden. Der so produzierte SSZ‐13 eignet sich hervorragend zur NOx‐Entfernung.