Banihashemi Fateme, Ibrahim Amr F M, Babaluo Ali Akbar, Lin Jerry Y S
School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287, USA.
Nanostructure Material Research Center, Department of Chemical Engineering, Sahand University of Technology, P.O. Box 51335/1996, Tabriz I.R., Iran.
Angew Chem Int Ed Engl. 2019 Feb 18;58(8):2519-2523. doi: 10.1002/anie.201814248. Epub 2019 Jan 21.
Highly b-oriented, closely packed, MFI zeolite films are prepared on seeded stainless-steel plates using organic template-free, secondary growth solutions, containing aluminum sulfate as a crystallization agent. The number of a-oriented twin crystals is significantly reduced, and even eliminated, simply by restricting the pH value of the secondary growth solution to the narrow range of 11.1-11.3. Values of pH can be adjusted through the controlled addition of (NH ) SO or H SO to secondary growth solutions of the composition (1 SiO :0.57 NaOH:137.5 H O:0.0050 (Al (SO ) ⋅18 H O)) or by simply decreasing the molar composition of NaOH with no extra additives.
使用不含有机模板的二次生长溶液，以硫酸铝作为结晶剂，在晶种不锈钢板上制备高度b取向、紧密堆积的MFI沸石膜。仅通过将二次生长溶液的pH值限制在11.1 - 11.3的狭窄范围内，a取向孪晶的数量就会显著减少，甚至消除。pH值可以通过向组成（1 SiO₂:0.57 NaOH:137.5 H₂O:0.0050 (Al₂(SO₄)₃·18 H₂O)）的二次生长溶液中控制性添加(NH₄)₂SO₄或H₂SO₄来调节，或者通过简单地降低NaOH的摩尔组成且不添加额外添加剂来调节。
