Accelerated synthesis of Al-rich zeolite beta via different radicalized seeds in the absence of organic templates

The radicalized seed strategy is introduced into the synthesis of Al-rich zeolite Beta without any organic templates. The different radicalized seeds milled for varied times (15 min, 30 min, 1 h, 2 h, 4 h) have been systematically investigated. By performing X-ray diffraction, Raman spectroscopy and electron paramagnetic resonance, the changes in seed structures and signals of radicals were characterized. Compared with the crystallization products synthesized in the presence of normal seeds, those synthesized in the presence of radicalized seeds milled for 30 min exhibited higher crystallinity, higher yields and larger BET specific surface areas and consumed shorter crystallization time. In the radicalized seed strategy, relatively complete ordered structures of seeds and generation of more free radicals are necessary to reach better acceleration effect.

Automated summary

The radicalized seed strategy can improve the synthesis of Al-rich zeolite Beta by enhancing crystallinity, yield, and BET specific surface areas while reducing crystallization time. Complete ordered structures of seeds and the generation of more free radicals are crucial for better acceleration effects in this strategy.