Investigation of the rapid crystallization method for the synthesis of MFI-type zeolites and study of the physicochemical properties of the products

Rational synthesis of Beta zeolite with improved quality by decreasing crystallization temperature in organotemplate-free route

“…Obviously, the fast crystallization rate is helpful for efficient production of zeolite crystals, but very fast crystallization rate sometimes results in the formation of zeolite crystals with more defects, giving relatively lower quality of zeolite products [41]. Therefore, it is possible to suitably reduce the crystallization rate to increase the zeolite quality during Beta-SDS synthesis.…”

Effect of crystallization temperature on the in situ valorization of physic nut (Jatropha curcus L.) wastes using synthetic HZSM-5 catalyst

“…2(b)), the crystalline phase of HZSM-5 was found in orthorhombic form according to JCPDS: 44-0003. The main peaks located at the 2 of 7.9, 8.8, 23.1, 23.7, and 23.9 are in the range of typical specific peaks of ZSM-5 (2=7-9 and 23-25), while the two small peaks determining aluminium content in the zeolite framework were also found at 2 of 45.0-45.5 (Ahmed et al, 1996;Szostak, 1998). A progressive increase in peak intensities with increasing synthesis temperature was observed (Fig.…”

Amino- and thiol-modified microporous silicalite-1 and mesoporous MCM-48 materials as potential effective adsorbents for Pb(II) in polluted aquatic systems

“…Silicalite-1. Silicalite-1 was synthesized according to a previously published procedure (Ahmad et al, 1996) with some modifications. These modifications include: the optimization of the molar ratio of template to silica source to reduce template residue and prevent the formation of carbon black in the product.…”

“…Simple, low-cost adsorption methods utilizing novel adsorbents such as zeolites (Babel and Kurniawan, 2003), activated carbon (Uzun and Guzel, 2000) and clays (Koppelman and Dillard, 1977) have been used. Unfortunately, most of these adsorbents have inherent limitations due to their wide distribution of pore size, heterogeneous pore structure and their relatively weak interactions with metallic ions (Fu and Wang, In this study, we report a revised procedure for the synthesis and functionalization of the aluminum-free microporous zeolite, silicalite-1 (Ahmad et al, 1996) and the mesoporous silicate system MCM-48 (Wang et al, 2001). Both systems have the same structure (MFI) with 3D network of channels.…”