The role of triethanolamine in zeolite crystallization

Nickel-Assisted Carbon-Fluorine Bond Activation of 2,4,6-Trifluoropyrimidine: Synthesis of New Pyrimidine and Pyrimidinone Derivatives

“…[4,5] Few other stable adducts of metal fluorides and HF have been reported, and none for a first-row transition metal. [4,6,7] The presence of a bifluoride unit in 2 is revealed by two signals in the Treatment with CsOH´H 2 O converted 2 into 1 and a second compound 3 (Scheme 1), which has four inequivalent fluorine atoms according to its 19 F NMR spectrum. The reaction was incomplete, and the 31 P NMR spectrum of the crude solution also revealed the presence of free phosphane.…”

Atomic Force Microscopy and High Resolution Scanning Electron Microscopy Investigation of Zeolite A Crystal Growth. Part 2: In Presence of Organic Additives

“…13,14 In synthesis where organic molecules are present additional organic-surface interactions may influence the formation of a particular face, but in the case of TEA, it has been found that the molecule is not included in the pore space of the final zeolite A products, indicating a lack of strong interaction between organic and framework. In the case of DEA there is no data available in the literature regarding its inclusion in the zeolite A pore space 4 , for that reason we performed C-NMR on some of the synthesised crystals. Results from these analyses indicated the absence of DEA molecules within the zeolite A pores.…”

“…[1][2][3][4][5][6][7] The most widely used additive is triethanolamine (TEA), which has been used to produce large zeolite A crystals. 5,6 This is because TEA complexes with Al 3+ ions through its hydroxyl groups, and then it releases them slowly, reducing the rate of nucleation.…”

Preparation of a Completely Oriented Molecular Sieve Membrane

“…Organic ligands such as bis-tris and TEA decrease the degree of supersaturation of [Al(OH) 4 ] À and thus facilitate homogeneous nucleation of the zeolite by an equilibrium reaction such as Equation (1). [6,7] Recently, Boudeau et al [28,29] attempted to…”

“…[1±7] For instance, the addition of triethanolamine (TEA) to the reaction mixture for the synthesis of LTA-type zeolite (NaAlSiO 4´x H 2 O) allows the growth of giant crystals [4±7] as a result of modification of the molecular structure of the Al species by TEA. [6,7] Zeolites are especially interesting because they can provide unique molecular selectivity to devices such as chemical sensors and catalyst membranes.[8±11] If a continuous zeolite coating with oriented channels were realized, a novel device in which the oriented channels could effectively control the access of molecules to the underlying surface could be constructed. So far, most zeolite films and membranes have random or partial orientation [12±23] or large voids between oriented particles.…”