Effect of template removal using plasma treatment on the structure and catalytic performance of MCM-22

Hu, Min; Zhao, Binran; Zhao, Dongyang; Yuan, Mei-Ting; Chen, Huiyong; Hao, Qingqing; Sun, Ming; Xu, Long; Ma, Xiaoxun

doi:10.1039/c8ra00212f

Cited by 17 publications

(2 citation statements)

References 45 publications

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“…12 Synthesis of microporous materials such as zeolites also entails the use of organic groups called structure directing agents (SDAs), which are most commonly also eliminated by a thermal treatment. In addition to the decreased silanol density, thermal treatment inflicts certain changes to the porous materials such as pore shrinkage in mesoporous silica 13 and formation of extra framework aluminum species (EFAl) in aluminosilicates 14 which are undesirable in certain applications. Over the years, alternative routes have been developed to remove the template effectively.…”

Section: ■ Introductionmentioning

confidence: 99%

Ozone Treatment: A Versatile Tool for the Postsynthesis Modification of Porous Silica-Based Materials

et al. 2018

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Facile synthesis of silica-based functional materials at low temperatures has remained a challenge in materials science. To this end, we demonstrate the use of a gaseous ozone stream, generated via an electric discharge method, as a versatile tool for the postsynthesis modification of silica-based functional nanomaterials. First, a parametric study is conducted with a mesoporous model material to obtain basic insights into the reaction of the organics with ozone. The study is then extended to a number of distinct silica-based inorganic materials. The scope of ozone treatment can be broadly classified into three categories: (a) elimination of templates or structure directing agents (SDAs) from materials with pore sizes ranging from 0.5 to 10 nm, (b) selective transformation of organic groups functionalized on the mesoporous silica, and (c) simultaneous elimination of intermediate polymeric shells and template from the outer shells to obtain yolk−shell type materials. Each material studied here requires different parameters (temperature, time, and concentration of ozone) depending on its physical and chemical properties which have been carefully examined. Overall, the study demonstrates the potential of ozone treatment in tailoring functional materials at low temperature and provides vital insights into the reaction of ozone with silica-based materials. The study shows that gaseous ozone treatment is not limited to only one type of materials but can be applied to many systems, and we are convinced that the methodology can be applied to a multitude of organic@inorganic systems way beyond the scope of materials presented here.

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Section: ■ Introductionmentioning

confidence: 99%

Ozone Treatment: A Versatile Tool for the Postsynthesis Modification of Porous Silica-Based Materials

et al. 2018

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“…This helped avoid the disadvantages of a hightemperature operation destroying the structure of molecular sieves. Compared to calcination, DBD plasma is able to preserve the structure accompanied by the removal of the framework template due to the low temperature [88]. In addition to the synthesis of micro-or mesoporous materials, NTPs can also be used to synthesize nanomaterials.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

A review of the advances in catalyst modification using nonthermal plasma: Process, Mechanism and Applications

Zhao

Nikiforov

et al. 2022

Advances in Colloid and Interface Science

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Synthesis and Post‐Synthesis Transformation of Germanosilicate Zeolites

et al. 2020

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Zeolites are one of the most important heterogeneous catalysts, with a high number of large‐scale industrial applications. While the synthesis of new zeolites remain rather limited, introduction of germanium has substantially increased our ability to not only direct the synthesis of zeolites but also to convert them into new materials post‐synthetically. The smaller Ge‐O‐Ge angles (vs. Si‐O‐Si) and lability of the Ge−O bonds in aqueous solutions account for this behaviour. This Minireview discusses critical aspects of germanosilicate synthesis and their post‐synthesis transformations to porous materials.

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Effect of template removal using plasma treatment on the structure and catalytic performance of MCM-22

Abstract: Template removal from MCM-22 using dielectric-barrier discharge (DBD) plasma could decrease the formation of extra-framework aluminum (EFAl) and increase the concentration of the acidic sites and external surface area of MCM-22.

Cited by 17 publications

References 45 publications

Ozone Treatment: A Versatile Tool for the Postsynthesis Modification of Porous Silica-Based Materials

Ozone Treatment: A Versatile Tool for the Postsynthesis Modification of Porous Silica-Based Materials

A review of the advances in catalyst modification using nonthermal plasma: Process, Mechanism and Applications

Synthesis and Post‐Synthesis Transformation of Germanosilicate Zeolites

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