Accelerated Construction of High-Silica RHO and CHA Zeolites via Interzeolite Transformation and Their NH3–SCR Performances after Copper Exchange,Industrial & Engineering Chemistry Research

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Accelerated Construction of High-Silica RHO and CHA Zeolites via Interzeolite Transformation and Their NH3–SCR Performances after Copper Exchange
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-11-30 , DOI: 10.1021/acs.iecr.8b03907
Quanli Ke _{1,

2} , Tianjun Sun ₁ , Hao Cheng ₁ , Xiaoli Wei _{1,

2} , Ya Guo _{1,

2} , Shengsheng Zhao ₁ , Shu Zeng _{1,

2} , Shudong Wang ₁

Affiliation

Rapid and selective synthesis of high-silica zeolites, including topologies of RHO and CHA, has been realized by interzeolite transformation process. The XRD patterns and morphology images collected within the whole procedure of aging and reaction suggest that the interzeolite transformation from FAU to RHO zeolite proceeds in a way of directly reassembling the locally ordered FAU-derived species, but as quasi-amorphous domains, on the surface of the RHO moieties. Therefore, the crystallization process could be remarkably accelerated by circumventing the incipient nucleation from the fundamental Si/Al species. Thenceforth, the high-silica descendant zeolites obtained by interzeolite transformation were all employed in the NH₃–SCR process after copper ion exchange to a similar level. Therein, the RHO zeolite achieves fine trade-off between the activity and durability even after hydrothermal treatment at 800 °C, which indicates that the durability issue involved could be validly fixed by this zeolite and once again highlights the advantages of the interzeolite conversion process.

中文翻译：

铜交换后高沸石RHO和CHA沸石通过互晶转变的加速构建及其NH ₃ -SCR性能

通过沸石间的转化过程，可以实现高选择性硅沸石的快速，选择性合成，包括RHO和CHA的拓扑结构。在老化和反应的整个过程中收集的XRD图案和形态图像表明，从FAU到RHO沸石的沸石间转变以直接重组表面有序FAU衍生物种的方式进行，但作为准非晶域在表面上进行。的RHO部分。因此，通过规避来自基本Si / Al物种的初期成核作用，可以显着加速结晶过程。从此以后，通过沸石间转变获得的高二氧化硅后代沸石全部用于NH _3中。铜离子交换后的–SCR过程达到相似的水平。其中，RHO沸石即使在800°C的水热处理后，仍能在活性和耐久性之间达成良好的折衷，这表明所涉及的耐久性问题可以通过这种沸石得到有效解决，并且再次凸显了沸石间转化过程的优势。

更新日期：2018-11-30

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