scholarly journals High-silica, heulandite-type zeolites prepared by direct synthesis and topotactic condensation

2015 ◽  
Vol 3 (24) ◽  
pp. 12890-12897 ◽  
Author(s):  
Joel E. Schmidt ◽  
Dan Xie ◽  
Mark E. Davis
Keyword(s):  
Thermal Stability ◽  
Direct Synthesis ◽  
High Silica ◽  
New Applications

High-silica heulandites prepared via topotactic condensation and direct synthesis that exhibit robust thermal stability, opening possibilities for new applications.

Direct synthesis of high-silica nano ZSM-5 aggregates with controllable mesoporosity and enhanced catalytic properties

RSC Advances ◽  
2016 ◽  
Vol 6 (101) ◽  
pp. 99129-99138 ◽  
Author(s):  
Hongyao Li ◽  
Yaquan Wang ◽  
Fanjun Meng ◽  
Hengbao Chen ◽  
Chao Sun ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Direct Synthesis ◽  
High Silica

In the absence of additional mesoporous template, high-silica nano-sized ZSM-5 aggregates have been rapidly synthesized by solid-like state conversion.

Direct Synthesis of 2,5-Diformylfuran from Carbohydrates Using High-Silica MOR Zeolite-Supported Isolated Vanadium Species

2017 ◽  
Vol 5 (11) ◽  
pp. 10029-10037 ◽  
Author(s):  
Wei Zhang ◽  
Tongsuo Meng ◽  
Junjie Tang ◽  
Wenxia Zhuang ◽  
Yu Zhou ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
High Silica ◽  
Vanadium Species

Facile Access to AgOCF 3 and Its New Applications as a Reservoir for OCF 2 for the Direct Synthesis of N−CF 3 , Aryl or Alkyl Carbamoyl Fluorides

2020 ◽  
Vol 26 (10) ◽  
pp. 2183-2186 ◽  
Author(s):  
Abdurrahman Turksoy ◽  
Thomas Scattolin ◽  
Samir Bouayad‐Gervais ◽  
Franziska Schoenebeck
Keyword(s):  
Direct Synthesis ◽  
New Applications

From Kaolins (with Addition of Al2O3) to Mullite Composite Nanocrystals: Experiments and Analysis

2007 ◽  
Vol 336-338 ◽  
pp. 2264-2266 ◽  
Author(s):  
Nan Chun Chen ◽  
Dong Chen
Keyword(s):  
Thermal Stability ◽  
Normal Pressure ◽  
High Thermal Stability ◽  
Hydrothermal Crystallization ◽  
Crystallization Method ◽  
Oxidation Reduction ◽  
Composite Oxides ◽  
High Silica ◽  
Average Size ◽  
Pressure Analysis

Natural and raw high-silica kaolins are firstly processed into fine kaolin powders with oxidation-reduction bleaching method before mixed with Al2O3 powders and then baked to produce mullite composite oxides at temperature between 1050-1150°C. The mullite composite oxides are further made into composite mullite nanocrystals by using open-system hydrothermal crystallization method under normal pressure. Analysis of the final products show that the mullite nanocrystals are texturally homogenous at an average size around 80-100 nm and have high thermal stability.

scholarly journals Direct synthesis of highly stretchable ceramic nanofibrous aerogels via 3D reaction electrospinning

2021 ◽  
Author(s):  
Xiaota Cheng ◽  
Yang Si ◽  
Jianyong Yu ◽  
Bin Ding
Keyword(s):  
Thermal Stability ◽  
High Performance ◽  
Tensile Strain ◽  
Compressive Strain ◽  
Direct Synthesis ◽  
Extreme Environments ◽  
Three Dimensional ◽  
High Thermal Stability ◽  
High Porosity ◽  
Mechanical Performances

Abstract Ceramic aerogels are attractive for many applications due to their ultralow density, high porosity, and multifunctionalities but are limited by the typical trade-off relationship between mechanical properties and thermal stability when used in extreme environments. In this work, we designed and synthesized a unique ceramic nanofibrous aerogels with three-dimensional (3D) interwoven crimped-nanofibre structures that endow the aerogels with superior mechanical performances and high thermal stability. These ceramic aerogels were synthesized by a direct and facile route, 3D reaction electrospinning. They displayed robust structural stability with structure-derived mechanical ultra-stretchability up to 100% tensile strain and superior restoring capacity up to 40% tensile strain, 95% bending strain and 60% compressive strain, high thermal stability from -196 to 1400°C, repeatable stretchability at working temperatures up to 1300 ℃, and a low thermal conductivity of 0.0228 W m−1 K−1 in air. This work should enable the innovative design of high-performance ceramic aerogels for various applications.

Thermal stability of high-silica zeolites of the ZSM-5 family

1985 ◽  
Vol 34 (12) ◽  
pp. 2463-2466 ◽  
Author(s):  
S. P. Zhdanov ◽  
N. N. Feoktistova ◽  
N. I. Kozlova ◽  
I. G. Polyakova
Keyword(s):  
Thermal Stability ◽  
High Silica ◽  
High Silica Zeolites ◽  
Thermal Stability Of

Hydrothermal synthesis of high silica zeolite Y using tetraethylammonium hydroxide as a structure-directing agent

2016 ◽  
Vol 52 (86) ◽  
pp. 12765-12768 ◽  
Author(s):  
Dawei He ◽  
Danhua Yuan ◽  
Zhijia Song ◽  
Yansi Tong ◽  
Yaqi Wu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Synthesis ◽  
Zeolite Y ◽  
Hydrothermal Stability ◽  
Structure Directing Agent ◽  
Tetraethylammonium Hydroxide ◽  
High Silica

Zeolite Y with a SiO2/Al2O3 ratio of 7.76 and outstanding thermal stability and hydrothermal stability is synthesized using TEAOH as an SDA.

scholarly journals FeF3 as a green catalyst for the synthesis of dihydropyrimidines via Biginelli reaction

2020 ◽  
Vol 11 (3) ◽  
pp. 206-212
Author(s):  
Thalishetti Krishna ◽  
Eppakayala Laxminarayana ◽  
Dipak Kalita
Keyword(s):  
Thermal Stability ◽  
Functional Group ◽  
Direct Synthesis ◽  
Biginelli Reaction ◽  
Environmentally Benign ◽  
Green Catalyst ◽  
Mild Conditions ◽  
Highly Efficient ◽  
High Acidity ◽  
Water Tolerance

A facile and highly efficient FeF3-catalyzed method has been developed for the direct synthesis of functionalized dihydropyrimidines from readily available starting materials via Biginelli reaction. These reactions proceed at low-catalyst loadings with high functional group tolerance under mild conditions. This method provides efficient reusability of the catalyst and good to excellent yields of the products, making the protocol more attractive, economical, and environmentally benign. FeF3 is an attractive catalyst for the Biginelli reaction because of its high acidity, thermal stability and water tolerance.

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