Temperature-controlled phase transfer hydrothermal synthesis of MWW zeolites

RSC Advances ◽  
2014 ◽  
Vol 4 (47) ◽  
pp. 24893-24899 ◽  
Author(s):  
Enhui Xing ◽  
Xiuzhi Gao ◽  
Wenhua Xie ◽  
Fengmei Zhang ◽  
Xuhong Mu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Phase Transfer ◽  
Structure Directing Agent ◽  
Temperature Controlled

Temperature-controlled phase transfer hydrothermal synthesis of MWW zeolites was realized with hexamethyleneimine as a structure-directing agent and aniline as a structure-promoting agent.

Temperature-controlled phase-transfer hydrothermal synthesis of MWW zeolites and their alkylation performances

RSC Advances ◽  
2016 ◽  
Vol 6 (35) ◽  
pp. 29707-29717 ◽  
Author(s):  
Enhui Xing ◽  
Yanchun Shi ◽  
Wenhua Xie ◽  
Fengmei Zhang ◽  
Xuhong Mu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Liquid Phase ◽  
Phase Transfer ◽  
High Conversion ◽  
Alkylation Of Benzene ◽  
Temperature Controlled

MWW zeolites have been synthesized with hexamethyleneimine/aniline as the structure-directing/promoting agent. High conversion is achieved in the liquid-phase alkylation of benzene with ethylene above 210 °C for MCM-56.

Synthesis, characterization and application of MCM-22 zeolites via a conventional HMI route and temperature-controlled phase transfer hydrothermal synthesis

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 8514-8522 ◽  
Author(s):  
Enhui Xing ◽  
Yanchun Shi ◽  
Wenhua Xie ◽  
Fengmei Zhang ◽  
Xuhong Mu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Phase Transfer ◽  
System P ◽  
Temperature Controlled

With less environmental and economical impact, temperature-controlled phase transfer hydrothermal synthesis of MWW zeolites was realized in HMI/AN system.

Efficient hydrodeoxygenation of phenolic compounds and raw lignin-oil under a temperature-controlled phase-transfer catalysis

Fuel ◽  
2021 ◽  
Vol 291 ◽  
pp. 120091
Author(s):  
Zhi Yang ◽  
Bowen Luo ◽  
Riyang Shu ◽  
Zhipeng Tian ◽  
Yu Kang ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Temperature Controlled

Hydrothermal synthesis of flower cluster-shaped ZnO microstructures with sodium lignosulfonate as structure-directing agent

2015 ◽  
Vol 26 (11) ◽  
pp. 9171-9177
Author(s):  
Chen Hao ◽  
Huailiang Zhang ◽  
Xiaohong Wang ◽  
Yuru Shen ◽  
Yinglu Yang ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Sodium Lignosulfonate ◽  
Structure Directing Agent

Hydrothermal synthesis of Sn-Beta zeolites in F−-free medium

2018 ◽  
Vol 5 (11) ◽  
pp. 2763-2771 ◽  
Author(s):  
Hao Xu ◽  
Xudong Wang ◽  
Peng Ji ◽  
Haihong Wu ◽  
Yejun Guan ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Lewis Acid ◽  
Crystal Size ◽  
Acid Catalysts ◽  
Free Medium ◽  
Lewis Acid Catalysts ◽  
Structure Directing Agent ◽  
Highly Active ◽  
Beta Zeolites

Sn-Beta zeolites, with high Sn content and smaller crystal size, hydrothermally synthesized in F−-free medium using N-cyclohexyl-N,N-dimethylcyclohexanaminium hydroxide as the structure-directing agent with the assistance of Na+ and seed, are highly active as Lewis acid catalysts.

Temperature-controlled hydrothermal synthesis of γ-MnOOH, Mn3O4 and MnCO3 on a carbon cloth for supercapacitor applications

CrystEngComm ◽  
2020 ◽  
Vol 22 (23) ◽  
pp. 4014-4022
Author(s):  
Shujuan Meng ◽  
Qiong Su ◽  
Ping Zhang ◽  
Wanhong Sun ◽  
Yanbin Wang
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Formation Mechanism ◽  
Reaction Temperature ◽  
Controlled Synthesis ◽  
Carbon Cloth ◽  
Temperature Controlled ◽  
Supercapacitor Applications

In this study, a reaction temperature-controlled synthesis of γ-MnOOH, Mn3O4 and MnCO3 (and also their mixture) on carbon cloth via a hydrothermal method is investigated, and the formation mechanism is discussed.

Floating Adsorbent for Organic Removal Fabricated Through Crystallization of Silicalite-1 on Hollow Glass Microspheres

2020 ◽  
Vol 12 (2) ◽  
pp. 173-179 ◽  
Author(s):  
Supinya Nijpanich ◽  
Takeshi Hagio ◽  
Yuki Kamimoto ◽  
Ryoichi Ichino
Keyword(s):  
Hydrothermal Synthesis ◽  
Crystallization Rate ◽  
Glass Microspheres ◽  
Hollow Glass Microspheres ◽  
Structure Directing Agent ◽  
Hollow Glass ◽  
Key Factor ◽  
Type Zeolite ◽  
High Silica ◽  
Filter Clogging

MFI-type zeolite is a crystalline microporous aluminosilicate with an intersecting two-dimensional pore structure and well-defined windows of approximately 0.55 nm. It generally crystallizes in high silica to alumina ratios, leading to a rather hydrophobic character. This makes it an attractive adsorbent for removing organic pollutants from wastewater. However, separating the conventional powdery-zeolites from the media after treatment is difficult because they require considerable time to settle. They also trigger filter clogging. In this work, high silica MFI-type zeolite, namely, silicalite-1, was synthesized on the surfaces of hollow glass microspheres to develop a floating adsorbent with high hydrophobicity. Tetraethylorthosilicate and tetrapropylammonium hydroxide were used as the additional silica source and structure directing agent, respectively. The crystallization of silicalite-1 on hollow glass microspheres was performed using hydrothermal synthesis at 180 °C or 150 °C for 40 h using a precursor sol with a molar composition of 3SiO2:1TPA:14EtOH:286H2O. The surface coverage and crystallinity of the as-prepared samples were optimized, and the floatability and adsorption performance of the optimized sample were investigated. Well-covered microspheres were obtained when hydrothermal synthesis was conducted at 180 °C using 0.5 g of hollow glass microspheres and 15 g of a precursor sol adjusted to pH 12.5. The balance between the dissolution rate of the hollow glass microspheres and the crystallization rate of silicalite-1 appeared to be the key factor in the successful synthesis.

TA Assisted Synthesis and Properties of Porous ZnO

2017 ◽  
Vol 726 ◽  
pp. 282-286
Author(s):  
Yang Yang Li ◽  
Ting Zhi Liu ◽  
Shu Wang Duo ◽  
Hai Ming Xu ◽  
Rui Fang Zhong
Keyword(s):  
Hydrothermal Synthesis ◽  
Tartaric Acid ◽  
Hexagonal Wurtzite Structure ◽  
Ftir Spectra ◽  
Wurtzite Structure ◽  
Capping Agent ◽  
Zno Nanostructures ◽  
Structure Directing Agent ◽  
Pl Spectra ◽  
Hierarchical Architectures

Multihole ZnO hierarchical architectures were prepared by tartaric acid assisted hydrothermal synthesis, TA acts as a capping agent and structure-directing agent during the synthesis. Hydrazine acts as alkali source. XRD confirmed that that all ZnO possess the hexagonal wurtzite structure, and the crystalline of the sample turns better after annealed. The PL spectra can be tuned by changing TA concentration. The FTIR spectra of ZnO nanostructures shows the main absorbance peaks of all samples are located at about 547 cm−1, which are attributed to the vibrations of elongation of ZnO without any other bonds.

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