By Scott M. Auerbach, Kathleen A. Carrado, Prabir K. Dutta
Bargains trenchant analyses of salient situations chosen expressly for his or her relevance to present and potential study. featuring the significant theoretical and experimental underpinnings of zeolites, this foreign attempt is immediately whole and forward-looking—a real standard-bearer combining primary innovations with the main subtle information for every medical subtopic and budding know-how.
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Extra info for Handbook of Zeolite Science and Technology
Using a mixture of TrPA and n-propyl bromide (PrBr), a pure ZSM-5 phase was reported. It was suggested that TPA cations were formed in traces and helped the nucleation process. The synthesis of silicalite-1 in presence of diethylamine (DEA) has been reported (54). The formation of DEA-silicalite-1 is favored by static conditions, high DEA concentrations, and low temperature (393 K), but the structure-directing property of DEA was marginal. Hexane-1,6-diamine (HEXDM) was found to be a good void ﬁller for the MFI framework and synthesis of silicalite-1 (55,56).
There are several reports of ﬁlms that proceed through a seeding step with colloidal seeds, followed by secondary growth (125–129). Carbon ﬁbers were surface modiﬁed to promote adsorption of colloidal seed crystals of silicalite-1. Such particles were then adsorbed as a monolayer on the ﬁber surface and induced to grow into a continuous ﬁlm of intergrown crystals of silicalite-1. Finally, the carbon ﬁber was removed by calcination in air, yielding hollow ﬁbers of silicalite-1 (125).
Enrichment in the rim was found primarily in crystals with TPA, as shown in Fig. 12, whereas crystals made in the presence of 1,6-hexanediol or completely inorganic reaction compositions had homogeneous aluminum profiles (101). The rationale for the zoning in the presence of TPA was that TPA helped incorporate primarily silicate species, whereas for a Na+ composition, aluminosilicate species were incorporated into the growing crystal (101). Aluminum-rich ZSM-5 with Si/Al of 11 has been synthesized, corresponding to 8 Al atoms per unit cell (total of 96 Si, Al atoms).