Development of mesopore-containing CON-type zeolite with unique acidic and catalytic properties

2020 ◽  
Vol 10 (13) ◽  
pp. 4293-4304 ◽  
Author(s):  
Sungsik Park ◽  
Gakuji Sato ◽  
Hiroaki Onozuka ◽  
Susumu Tsutsuminai ◽  
Masakazu Koike ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Cetyltrimethylammonium Bromide ◽  
Catalytic Properties ◽  
Type Zeolite

Post-synthetic hydrothermal treatment in NH4OH solution containing cetyltrimethylammonium bromide.

Effect of modification of ZSM-5 type zeolite with calcium phosphate on its physico-chemical and catalytic Properties

1988 ◽  
Vol 39 ◽  
pp. 315-324 ◽  
Author(s):  
K. Suzuki ◽  
Y. Kiyozumi ◽  
K. Matsuzaki ◽  
S. Ikai ◽  
S. Shin
Keyword(s):  
Calcium Phosphate ◽  
Catalytic Properties ◽  
Physico Chemical ◽  
Type Zeolite

BiOCl0.8 Br0.2 Photocatalyst Preparation and Degradation of Dye Wastewater under Ultraviolet-Light

2014 ◽  
Vol 675-677 ◽  
pp. 661-664 ◽  
Author(s):  
Meng Ran Zhang ◽  
Ai Ju Xu ◽  
Ga La Sa
Keyword(s):  
Photocatalytic Activity ◽  
Ultraviolet Light ◽  
Cetyltrimethylammonium Bromide ◽  
Room Temperature ◽  
Degradation Rate ◽  
Catalytic Properties ◽  
Precipitation Method ◽  
Dye Wastewater ◽  
Cetyltrimethylammonium Chloride ◽  
Uv Visible

A series of BiOCl(1-x)Brxcatalysts were prepared by the precipitation method using cetyltrimethylammonium bromide ( CTAB ) and cetyltrimethylammonium chloride ( CTAC ) as template and source of halogen. UV-Visible, XRD and FTIR were employed to investigate the composition and catalytic properties of the catalyst. The results show that the BiOCl0.8Br0.2composite exhibits the highest photocatalytic activity at room temperature. The degradation rate of dye wastewater containing 3mg/mL catalysts is 82%.

scholarly journals Synthesis of Diatomite-Based Mesoporous Wool-Ball-Like Microspheres and Their Application for Toluene Total Oxidation Reaction

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 339
Author(s):  
Quoc-Chon Le ◽  
Chinh Chien Nguyen ◽  
Thi Thanh Nhi Le ◽  
Thierry Lefèvre ◽  
Minh Tuan Nguyen Dinh ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Hydrothermal Treatment ◽  
Specific Surface Area ◽  
Oxidation Reaction ◽  
Cetyltrimethylammonium Bromide ◽  
Low Cost ◽  
Total Oxidation ◽  
Mesoporous Microspheres ◽  
Toluene Total Oxidation

Diatomite (DE) has attracted considerable attention owing to its abundance, low cost, and potential for a wide variety of applications. This work reports the development of mesoporous wool-ball-like (WBL) microspheres from natural DE through a simple hydrothermal treatment. We discovered that the presence of cetyltrimethylammonium bromide is a prerequisite for generating monodispersed WBL microspheres. The mechanism for the transformation of pristine DE into mesoporous microspheres through dissolution–recrystallization was clearly investigated. Interestingly, the microspheres exhibited a specific surface area 25–60 times larger than that of the pristine DE. The application of WBL microsphere DE as an effective support for metallic catalysts in the toluene total oxidation reaction was demonstrated.

scholarly journals Effect of Hydrothermal Treatment on Structural and Catalytic Properties of [CTA]-MCM-41 Silica

Materials ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 860 ◽  
Author(s):  
Iago Zapelini ◽  
Laura Silva ◽  
Dilson Cardoso
Keyword(s):  
Hydrothermal Treatment ◽  
Catalytic Properties ◽  
Mcm 41

scholarly journals Effects of Si/Al Ratios on the Bulk-Type Zeolite Formation Using Synthetic Metakaolin-Based Geopolymer with Designated Composition

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1310
Author(s):  
Guoru Ma ◽  
Chengying Bai ◽  
Meirong Wang ◽  
Peigang He
Keyword(s):  
Phase Composition ◽  
Hydrothermal Treatment ◽  
Hydrothermal Process ◽  
Molar Ratios ◽  
Zeolite Formation ◽  
Fixed Composition ◽  
Type Zeolite ◽  
Influence Of Impurities ◽  
Geopolymer Composites

In this paper, synthetic metakaolin with fixed composition (Al2O3·2SiO2) was produced by a simple chemosynthetic route. The chemosynthetic metakaolin can eliminate the influence of impurities in metakaolin from natural kaolin minerals. The synthetic metakaolin together with NaOH and SiO2-sol were used to prepare Na-based geopolymer precursors with various molar ratios of Si/Al. The molar ratios of Si/Al from 1 to 2 were tailored by adding different contents of SiO2-sol. Zeolite/geopolymer composites or monolith-type zeolite were successfully fabricated from synthetic metakaolin-based geopolymer through a hydrothermal process. The effects of Si/Al ratios on the phase composition and microstructure of the produced zeolite/geopolymer composites or zeolites were studied. The results proved that the composition of synthetic metakaolin and geopolymer precursors can be facilely tuned, and the monolithic geopolymer precursors can be mostly, or even totally, transformed into zeolite after hydrothermal treatment.

Synthesis of Zeolite A from Mongolian Coal Fly Ash by Hydrothermal Treatment

2018 ◽  
Vol 271 ◽  
pp. 1-8 ◽  
Author(s):  
Ulambayar Rentsenorov ◽  
Batmunkh Davaabal ◽  
Jadambaa Temuujin
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Cation Exchange Capacity ◽  
Coal Fly Ash ◽  
Batch Composition ◽  
Exchange Capacity ◽  
Zeolite Synthesis ◽  
Zeolite A ◽  
Acid Pretreatment ◽  
Type Zeolite

Raw coal fly ash and acid pretreated fly ash were used to synthesize A-type zeolite by hydrothermal treatment. In order to synthesize zeolite A an aqueous gel having a molar batch composition of Na2O:Al2O3:1.926SiO2:128H2O was utilized. Fly ash and zeolitic products were characterized by SEM, XRF, XRD and cation exchange capacity (CEC). After hydrothermal treatment, several types of zeolites were formed: zeolite A, analcime, faujasite and hydroxy-sodalite. The highest content of zeolite A was formed in the mixture treated at 80°C for 8 hours. CEC values of the zeolitic products were 28-38 times higher than that of in raw fly ash. Acid pretreatment which leads to low calcium and iron content is preferable method for processing of fly ash for the zeolite synthesis. Synthesized zeolite can be used for ion exchangers for water treatment.

HREM investigation of mesopore formation, aluminum migration in USY catalysts

1992 ◽  
Vol 50 (1) ◽  
pp. 322-323
Author(s):  
C. Choi-Feng ◽  
J. B. Hall ◽  
B. J. Huggins ◽  
R. A. Beyerlein
Keyword(s):  
Electron Microscope ◽  
Hydrothermal Treatment ◽  
Catalytic Properties ◽  
Tetrahedral Site ◽  
Inhomogeneous Distribution ◽  
Hydrothermal Aging ◽  
Usy Zeolite ◽  
Silica Source ◽  
Transmission Electron ◽  
Cracking Catalysts

The catalytic properties of ultrastable Y (USY) zeolite are directly influenced by the zeolite destruction which occurs during formation of USY and during subsequent hydrothermal treatment Previous transmission electron microscope (TEM) studies of hydrothermal aging of neat USY materials and also of USY cracking catalysts have shown 5-50nm defect domains, which were attributed to mesopores. Such features are characteristic of extended hydrothermal treatment. It has been suggested that these regions of zeolite destruction comprise the silica source for “healing” the tetrahedral site vacancies left by hydrothermal dealumination. The observations of both homogeneous and inhomogeneous distribution of these mesopores have been reported.

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