Promotion effect of Mg on a post-synthesized Sn-Beta zeolite for the conversion of glucose to methyl lactate

2020 ◽  
Vol 10 (3) ◽  
pp. 700-709 ◽  
Author(s):  
Xiaomei Yang ◽  
Bin Lv ◽  
Tianliang Lu ◽  
Yunlai Su ◽  
Lipeng Zhou
Keyword(s):  
Beta Zeolite ◽  
Promotion Effect ◽  
Methyl Lactate ◽  
Molar Ratios ◽  
Beta Zeolites

Mg-Sn-Beta zeolites with different Mg/Sn molar ratios were prepared from the parent deAl-Beta by a coimpregnation method. It shows higher selectivity for the conversion of glucose to methyl lactate than post-synthesized Sn-Beta.

Rapid, Non-Toxic Synthesis of Beta Zeolites

2018 ◽  
Author(s):  
Felix Hemmann ◽  
Jonathan Hackebeil ◽  
Andreas Lißner ◽  
Florian Mertens
Keyword(s):  
Hydrofluoric Acid ◽  
Molecular Sieves ◽  
Toxic Chemicals ◽  
Lewis Acidity ◽  
Beta Zeolite ◽  
Seeded Growth ◽  
Related Research ◽  
Beta Zeolites ◽  
Growth Method ◽  
Fast Synthesis

Molecular sieves with beta zeolite topology are promising catalysts for various reactions as they exhibits extraordinary Lewis acidity. However, their industrial application and related research in academica is hindered because their synthesis is time consuming and typically involves toxic chemicals as hydrofluoric acid. Therefore, tetraethylammonium fluorid was tested as a non-toxic fluotide source for the synthesis of beta zeolites. In combination with the previously reported nano-seeded growth method, a fast synthesis of beta zeolites only involving non-toxic chemicals was possible. Synthesized zeolites show comparable selectivity in the Bayer-Villinger oxidation as conventional zeolites synthesized with hydrofluoric acid.<br>

scholarly journals An Investigation into the Adsorption of Aniline from Aqueous Solution Using H-Beta Zeolites and Copper-Exchanged Beta Zeolites

2005 ◽  
Vol 23 (3) ◽  
pp. 255-266 ◽  
Author(s):  
J. O'Brien ◽  
T. Curtin ◽  
T.F. O'Dwyer
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Zeolite Beta ◽  
Langmuir Model ◽  
Beta Zeolite ◽  
Copper Leaching ◽  
Beta Zeolites ◽  
The Stability ◽  
Ph Range ◽  
Adsorbent Materials

Zeolite beta, a large-pore zeolite, was investigated in this study with a view to examining it as a potential adsorbent for the removal of aniline from aqueous solutions. Two different metal-loaded zeolites were prepared by exchanging H-beta zeolite (SiO2/Al2O3 = 75:1) with copper. The influence of exchanged copper on the uptake level was assessed. The effect of varying the silica-to-alumina ratio of the H-beta zeolite on the aniline uptake level was also examined, using three different H-beta zeolites with ratios of 25:1, 75:1 and 150:1 as adsorbents. The sorption experiments indicated an uptake level of ca. 110–120 mg/g for each zeolite and this level was also adsorbed by the copper-modified H-beta zeolites (SiO2/Al2O3 = 75:1). In all cases, the adsorption process followed the Langmuir model for adsorption and the level of aniline adsorbed was largely unaffected by a change in temperature or the presence of extra framework copper. The stability of the exchanged copper on these zeolites was then examined by measuring the quantity of copper leached from each zeolite into solution as a function of pH. Minimum copper leaching was observed in the pH range 5–11. This provided a stable pH working range for the adsorbent materials.

Promotion Effect of Sn on Au/Sn-USY Catalysts for One-Pot Conversion of Glycerol to Methyl Lactate

ACS Catalysis ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 7274-7284 ◽  
Author(s):  
Tianliang Lu ◽  
Xiaomin Fu ◽  
Lipeng Zhou ◽  
Yunlai Su ◽  
Xiaomei Yang ◽  
...  
Keyword(s):  
One Pot ◽  
Promotion Effect ◽  
Methyl Lactate

Highly selective production of renewable p-xylene from bio-based 2,5-dimethylfuran and ethylene over Al-modified H-Beta zeolites

2019 ◽  
Vol 9 (20) ◽  
pp. 5676-5685 ◽  
Author(s):  
Rongrong Zhao ◽  
Lulu Xu ◽  
Shengjun Huang ◽  
Weiping Zhang
Keyword(s):  
Beta Zeolite ◽  
Coke Content ◽  
Beta Zeolites

H-Beta zeolite with further dealumination and modification with alumina shows excellent and durable performances in the synthesis of renewable p-xylene (PX) via bio-based 2,5-dimethylfuran and ethylene with a PX yield of 97% and much less coke content.

scholarly journals Pt-Sn Supported on Beta Zeolite with Enhanced Activity and Stability for Propane Dehydrogenation

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 25
Author(s):  
Su-Un Lee ◽  
You-Jin Lee ◽  
Soo-Jin Kwon ◽  
Jeong-Rang Kim ◽  
Soon-Yong Jeong
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
High Surface ◽  
Coke Formation ◽  
Propane Dehydrogenation ◽  
Coke Deposition ◽  
Beta Zeolite ◽  
Lower Amount ◽  
Metal Catalyst ◽  
Beta Zeolites

With the growing global propylene demand, propane dehydrogenation (PDH) has attracted great attention for on-purpose propylene production. However, its industrial application is limited because catalysts suffer from rapid deactivation due to coke deposition and metal catalyst sintering. To enhance metal catalyst dispersion and coke resistance, Pt-based catalysts have been widely investigated with various porous supports. In particular, zeolite can benefit from large surface area and acid sites, which favors high metal dispersion and promoting catalytic activity. In this work, we investigated the PDH catalytic properties of Beta zeolites as a support for Pt-Sn based catalysts. In comparison with Pt-Sn supported over θ-Al2O3 and amorphous silica (Q6), Beta zeolite-supported Pt-Sn catalysts exhibited a different reaction trend, achieving the best propylene selectivity after a proper period of reaction time. The different PDH catalytic behavior over Beta zeolite-supported Pt-Sn catalysts has been attributed to their physicochemical properties and reaction mechanism. Although Pt-Sn catalyst supported over Beta zeolite with low acidity showed low Pt dispersion, it formed a relatively lower amount of coke on PDH reaction and maintained a high surface area and active Pt surfaces, resulting in enhanced stability for PDH reaction. This work can provide a better understanding of zeolite-supported Pt-Sn catalysts to improve PDH catalytic activity with high selectivity and low coke formation.

Effect of hierarchical porosity in Beta zeolites on the Beckmann rearrangement of oximes

2017 ◽  
Vol 7 (1) ◽  
pp. 181-190 ◽  
Author(s):  
M. Linares ◽  
C. Vargas ◽  
A. García ◽  
C. Ochoa-Hernández ◽  
J. Čejka ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Beckmann Rearrangement ◽  
Molar Ratios ◽  
Hierarchical Porosity ◽  
Beta Zeolites ◽  
Hierarchical Beta

Hierarchical Beta zeolites with different Si/Al molar ratios, synthesized by crystallization of silanized protozeolitic units, were investigated in the liquid-phase Beckmann rearrangement of cyclohexanone and cyclododecanone oximes.

Fabrication of Hierarchical Sn-Beta Zeolite as Efficient Catalyst for Conversion of Cellulosic Sugar to Methyl Lactate

2020 ◽  
Vol 8 (9) ◽  
pp. 3796-3808 ◽  
Author(s):  
Bo Tang ◽  
Shuang Li ◽  
Wei-Chao Song ◽  
En-Cui Yang ◽  
Xiao-Jun Zhao ◽  
...  
Keyword(s):  
Beta Zeolite ◽  
Efficient Catalyst ◽  
Methyl Lactate

Facile Preparation of a Binderless Hierarchical Beta Zeolite in Shaped Form and with Improved Acidity for Catalysis

2020 ◽  
Author(s):  
Jiaxu Liu ◽  
Zhenmei Zhang ◽  
Chunyan Liu ◽  
Gianvito Vilé ◽  
Guang Xiong ◽  
...  
Keyword(s):  
Materials Science ◽  
Zeolite Catalysts ◽  
Beta Zeolite ◽  
Synthetic Approach ◽  
Advanced Manufacturing ◽  
Hierarchical Zeolite ◽  
Characterization Methods ◽  
Tetraethylammonium Hydroxide ◽  
Beta Zeolites ◽  
Structure Properties

<div> <div> <div> <div> <p>The synthesis of a technical hierarchical nanosized zeolite catalysts without growth modifiers and binders remains a major challenge in catalysis. Herein, we report a new synthetic approach to directly produce hierarchical nanosized Beta zeolites in technical form, without any binders in the final material. The synthesis consists of two steps, where a Beta zeolite powder is first shaped using tetraethyl orthosilicate; the extrude is then recrystallized at high temperature in the presence of tetraethylammonium hydroxide solution. This transforms the SiO2 binders into zeolite framework. A variety of characterization methods were applied to unlock structure-properties relationships of the materials and demostrate their catalytic functionality. We believe that this work opens avenues for the advanced manufacturing of hierarchical zeolite materials in shaped form, and will find useful applications in catalysis and materials science. </p> </div> </div> </div> </div>

Zeolite-templated Carbon Network: A Beta Zeolite Case Study

MRS Advances ◽  
2020 ◽  
Vol 5 (14-15) ◽  
pp. 751-756 ◽  
Author(s):  
Eliezer F. Oliveira ◽  
Leonardo D. Machado ◽  
Ray H. Baughman ◽  
Douglas S. Galvao
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Beta Zeolite ◽  
Beta Zeolites ◽  
Preliminary Study ◽  
The One ◽  
Dynamics Simulations ◽  
Carbon Nanotube Networks ◽  
Carbon Network

ABSTRACTIn this work, we report a preliminary study, based on molecular dynamics simulations, about 3D carbon nanotube networks that could be formed inside the beta zeolites. We investigated their structural stability and mechanical properties. Our results show that from all possible carbon nanotubes that can be embedded inside the channels of the beta zeolite, the one with chirality (6,0) is the most stable. Using the carbon nanotube (6,0), it is possible to build 3D structures with both all (higher density) and only partially (lower density) filled zeolite channels. Under tensile uniaxial force, the 3D low-density carbon nanotube networks are anisotropic and can be stretched along the direction in which all nanotubes are perpendicular up to 130% of strain without fracture. Also, the porosity and network stiffness can be tuned depending on the amount of carbon nanotubes filling the channels of the zeolites.

Understanding the roles of different acid sites in Beta zeolites with different particle sizes catalyzed liquid-phase transalkylation of diethylbenzene with benzene

2021 ◽  
Author(s):  
Chuanyu Yang ◽  
Zhongwen Dong ◽  
Weifeng Chu ◽  
Yanan Wang ◽  
Dongpu Zhao ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Acid Sites ◽  
Zeolite Catalysts ◽  
Beta Zeolite ◽  
Particle Sizes ◽  
Synthesis System ◽  
Beta Zeolites

A series of Beta zeolite catalysts with controllable particle sizes and similar Si/Al ratios were prepared by introducing imidazole (IMD) into the synthesis system and used for a liquid-phase transalkylation...

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