张维萍

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:男

毕业院校:中科院大连化学物理研究所

学位:博士

所在单位:化工学院

学科:工业催化. 能源化工

办公地点:西部校区化工实验楼B-323

联系方式:0411-84986326

电子邮箱:wpzhang@dlut.edu.cn

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Efficient and rapid transformation of high silica CHA zeolite from FAU zeolite in the absence of water

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论文类型:期刊论文

发表时间:2017-05-21

发表刊物:JOURNAL OF MATERIALS CHEMISTRY A

收录刊物:SCIE、EI

卷号:5

期号:19

页面范围:9076-9080

ISSN号:2050-7488

摘要:High silica CHA zeolite plays an important role in selective catalytic reduction of NOx with NH3 (NH3-SCR), but its synthesis is not highly efficient due to the use of a relatively high-cost structural directing agent (SDA) N, N, N-trimethyl-adamantammonium hydroxide (TMAdaOH) and relatively long crystallization time under hydrothermal conditions. Herein, we report an efficient and rapid synthesis of a high silica CHA zeolite possessing good crystallinity and uniform crystals (CHA-ST). The method includes interzeolite transformation of high silica FAU zeolite in the absence of water but the presence of zeolite seeds and a bromide form of the SDA. The absence of water in the synthesis significantly improves the zeolite yield by avoiding dissolution of aluminosilicate species in aqueous media, while the addition of zeolite seeds remarkably enhances the crystallization rate under solvent-free conditions. In addition, this route allows the use of a low-cost bromide form of the SDA. Catalytic tests in the NH3-SCR show that copper-exchanged CHA-ST (Cu-CHA-ST) exhibits comparable catalytic properties to those of Cu-SSZ-13 obtained from the conventional hydrothermal route.