“Open” Nonporous Nonasil Zeolite Structure for Selective Catalysis

2021 ◽  
Author(s):  
Kun Lu ◽  
Yaqi Fan ◽  
Ju Huang ◽  
Jilong Wang ◽  
Hao Xu ◽  
...  
Keyword(s):  
Zeolite Structure ◽  
Selective Catalysis

scholarly journals Structure and 3D-3D Topotactic Transformation of the Aluminophosphate Molecular Sieve PST-5 and Its Implication in New Zeolite Structure Generation

2020 ◽  
Author(s):  
Zhehao Huang ◽  
Seungwan Seo ◽  
Jiho Shin ◽  
Bin Wang ◽  
Rob Bell ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Structure Transformation ◽  
Structure Generation ◽  
Zeolite Structure ◽  
Pore Structures ◽  
Novel Approach ◽  
Shape Selective ◽  
Selective Catalysis ◽  
Topotactic Transformation ◽  
Molecular Dimensions

Zeolites have attracted great interest over recent decades. Their unique pore structures of molecular dimensions and tunable compositions make them ideal for shape selective catalysis and separation. However, targeted synthesis of zeolites with new pore structures and compositions remains a key challenge. Here, we propose a novel approach based on a unique 3D-3D topotactic transformation, which takes advantage of weak bonding in zeolites. This is inspired by the structure transformation of PST-5, a new aluminophosphate molecular sieve, to PST-6 by calcination at 500 °C. The structure of PST-5 was determined from micrometer-sized crystals by 3D electron diffraction (3DED, also known as MicroED). We found that the 3D-3D topotactic transformation involves two types of building units where penta- or hexa-coordinated Al is present. We applied this approach to several other zeolite systems and predicted a series of new zeolite structures that would be synthetically feasible. This method provides a new concept for the synthesis of targeted zeolites, especially those which may not be feasible by conventional methods.

Structure and 3D-3D Topotactic Transformation of the Aluminophosphate Molecular Sieve PST-5 and Its Implication in New Zeolite Structure Generation

2020 ◽  
Author(s):  
Zhehao Huang ◽  
Seungwan Seo ◽  
Jiho Shin ◽  
Bin Wang ◽  
Rob Bell ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Structure Transformation ◽  
Structure Generation ◽  
Zeolite Structure ◽  
Pore Structures ◽  
Novel Approach ◽  
Shape Selective ◽  
Selective Catalysis ◽  
Topotactic Transformation ◽  
Molecular Dimensions

Zeolites have attracted great interest over recent decades. Their unique pore structures of molecular dimensions and tunable compositions make them ideal for shape selective catalysis and separation. However, targeted synthesis of zeolites with new pore structures and compositions remains a key challenge. Here, we propose a novel approach based on a unique 3D-3D topotactic transformation, which takes advantage of weak bonding in zeolites. This is inspired by the structure transformation of PST-5, a new aluminophosphate molecular sieve, to PST-6 by calcination at 500 °C. The structure of PST-5 was determined from micrometer-sized crystals by 3D electron diffraction (3DED, also known as MicroED). We found that the 3D-3D topotactic transformation involves two types of building units where penta- or hexa-coordinated Al is present. We applied this approach to several other zeolite systems and predicted a series of new zeolite structures that would be synthetically feasible. This method provides a new concept for the synthesis of targeted zeolites, especially those which may not be feasible by conventional methods.

scholarly journals Structure and 3D-3D Topotactic Transformation of the Aluminophosphate Molecular Sieve PST-5 and Its Implication in New Zeolite Structure Generation

2020 ◽  
Author(s):  
Zhehao Huang ◽  
Seungwan Seo ◽  
Jiho Shin ◽  
Bin Wang ◽  
Rob Bell ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Structure Transformation ◽  
Structure Generation ◽  
Zeolite Structure ◽  
Pore Structures ◽  
Novel Approach ◽  
Shape Selective ◽  
Selective Catalysis ◽  
Topotactic Transformation ◽  
Molecular Dimensions

Zeolites have attracted great interest over recent decades. Their unique pore structures of molecular dimensions and tunable compositions make them ideal for shape selective catalysis and separation. However, targeted synthesis of zeolites with new pore structures and compositions remains a key challenge. Here, we propose a novel approach based on a unique 3D-3D topotactic transformation, which takes advantage of weak bonding in zeolites. This is inspired by the structure transformation of PST-5, a new aluminophosphate molecular sieve, to PST-6 by calcination at 500 °C. The structure of PST-5 was determined from micrometer-sized crystals by 3D electron diffraction (3DED, also known as MicroED). We found that the 3D-3D topotactic transformation involves two types of building units where penta- or hexa-coordinated Al is present. We applied this approach to several other zeolite systems and predicted a series of new zeolite structures that would be synthetically feasible. This method provides a new concept for the synthesis of targeted zeolites, especially those which may not be feasible by conventional methods.

scholarly journals Structure and 3D-3D Topotactic Transformation of the Aluminophosphate Molecular Sieve PST-5 and Its Implication in New Zeolite Structure Generation

2020 ◽  
Author(s):  
Zhehao Huang ◽  
Seungwan Seo ◽  
Jiho Shin ◽  
Bin Wang ◽  
Rob Bell ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Structure Transformation ◽  
Structure Generation ◽  
Zeolite Structure ◽  
Pore Structures ◽  
Novel Approach ◽  
Shape Selective ◽  
Selective Catalysis ◽  
Topotactic Transformation ◽  
Molecular Dimensions

Zeolites have attracted great interest over recent decades. Their unique pore structures of molecular dimensions and tunable compositions make them ideal for shape selective catalysis and separation. However, targeted synthesis of zeolites with new pore structures and compositions remains a key challenge. Here, we propose a novel approach based on a unique 3D-3D topotactic transformation, which takes advantage of weak bonding in zeolites. This is inspired by the structure transformation of PST-5, a new aluminophosphate molecular sieve, to PST-6 by calcination at 500 °C. The structure of PST-5 was determined from micrometer-sized crystals by 3D electron diffraction (3DED, also known as MicroED). We found that the 3D-3D topotactic transformation involves two types of building units where penta- or hexa-coordinated Al is present. We applied this approach to several other zeolite systems and predicted a series of new zeolite structures that would be synthetically feasible. This method provides a new concept for the synthesis of targeted zeolites, especially those which may not be feasible by conventional methods.

Cyclohexylation of Naphthalene Over USY Zeolites

1999 ◽  
Vol 64 (1) ◽  
pp. 138-148 ◽  
Author(s):  
Miroslav Michvocík ◽  
Dušan Mravec ◽  
Milan Hronec ◽  
Agáta Smiešková ◽  
Pavol Hudec
Keyword(s):  
Liquid Phase ◽  
Hydrochloric Acid ◽  
Thermal Stabilization ◽  
Y Zeolite ◽  
Zeolite Structure ◽  
Positive Effect

The influence of thermal stabilization of NH4-Y zeolite and modification of USY zeolites with solutions of hydrochloric acid on the cyclohexylation of naphthalene in the liquid phase was studied. Removal of the part of extra-framework aluminium from zeolite structure has a positive effect on both conversion of naphthalene and amount of dicyclohexylnaphthalenes formed. Modification of zeolites leads to an increase in conversion and selectivity of β-substitution in the naphthalene cyclohexylation.

scholarly journals Selective Catalysis Remedies Polysulfide Shuttling in Lithium‐Sulfur Batteries

2021 ◽  
pp. 2101006
Author(s):  
Wuxing Hua ◽  
Huan Li ◽  
Chun Pei ◽  
Jingyi Xia ◽  
Yafei Sun ◽  
...  
Keyword(s):  
Lithium Sulfur Batteries ◽  
Selective Catalysis ◽  
Lithium Sulfur

The Alkylation of Biphenyl over Fourteen-Membered Ring Zeolites. The Influence of Zeolite Structure and Alkylating Agent on the Selectivity for 4,4′-Dialkylbiphenyl

2007 ◽  
Vol 80 (7) ◽  
pp. 1418-1428 ◽  
Author(s):  
Yoshihiro Sugi ◽  
Hiroyoshi Maekawa ◽  
Shafeek Abdul Rashid Mulla ◽  
Akira Ito ◽  
Chikayo Naitoh ◽  
...  
Keyword(s):  
Alkylating Agent ◽  
Membered Ring ◽  
Zeolite Structure

Preparation and study of Mn-containing silicates of zeolite structure

1984 ◽  
Vol 26 (3-4) ◽  
pp. 259-264 ◽  
Author(s):  
L. A. Vostrikova ◽  
V. K. Ermolaev ◽  
K. G. Ione
Keyword(s):  
Zeolite Structure
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