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Synthesis of Highly Active Nanozeolites Using Methods of Mechanical Milling, Recrystallization, and Dealumination (A Review)
Petroleum Chemistry ( IF 1.4 ) Pub Date : 2021-07-07 , DOI: 10.1134/s0965544121050182
P. S. Kuznetsov 1, 2 , K. I. Dementiev 1 , T. A. Palankoev 1 , D. S. Kalmykova 1 , V. V. Malyavin 1 , A. D. Sagaradze 1 , A. L. Maximov 1
Affiliation  

Abstract

Methods for preparing zeolites with the particle size of 50–200 nm using mechanical milling on bead mills (top-down approach) are analyzed. The milling can be described by a first-order rate equation, but mathematical models allowing prediction of the particle size and degree of crystallinity of zeolite after milling, based on the process parameters, are still lacking. The milling is accompanied by degradation of the zeolite lattice, leading to a decrease in the zeolite crystallinity and activity in catalytic reactions. Recrystallization and dealumination may be promising ways to restore the zeolite structure after milling; in this case, the choice of the conditions for such posttreatment is of crucial importance. Evolution of textural and acid properties of zeolites in the course of milling is considered, and the effect of milling conditions on the catalytic activity of zeolites in various reactions is discussed. The main outcome from a decrease in the size of zeolite catalysts is an increase in their activity and a decrease in the deactivation rate.



中文翻译:

使用机械研磨、再结晶和脱铝方法合成高活性纳米沸石(综述)

摘要

分析了在珠磨机上使用机械研磨(自上而下的方法)制备粒径为 50-200 nm 的沸石的方法。研磨可以通过一阶速率方程来描述,但仍然缺乏基于工艺参数预测研磨后沸石粒度和结晶度的数学模型。研磨伴随着沸石晶格的降解,导致沸石结晶度和催化反应活性的降低。再结晶和脱铝可能是在研磨后恢复沸石结构的有希望的方法;在这种情况下,这种后处理条件的选择至关重要。考虑了研磨过程中沸石的结构和酸性特性的演变,讨论了球磨条件对沸石在各种反应中催化活性的影响。沸石催化剂尺寸减小的主要结果是其活性增加和失活率降低。

更新日期:2021-07-07
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