scholarly journals Inter-connected and open pore hierarchical TS-1 with controlled framework titanium for catalytic cyclohexene epoxidation

2018 ◽  
Vol 8 (8) ◽  
pp. 2211-2217 ◽  
Author(s):  
Yilai Jiao ◽  
Abdul-Lateef Adedigba ◽  
Qian He ◽  
Peter Miedziak ◽  
Gemma Brett ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Cyclohexene Epoxidation ◽  
Post Synthesis

A post-synthesis method was developed to reduce the extra-framework titanium in TS-1 zeolites in which TPAOH was used to convert amorphous Ti to zeolitic phases.

scholarly journals R-Silsesquioxane-Based Network Polymers by Fluoride Catalyzed Synthesis: An Investigation of Cross-Linker Structure and Its Influence on Porosity

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1849 ◽  
Author(s):  
Nai-hsuan Hu ◽  
Joseph C. Furgal
Keyword(s):  
Surface Area ◽  
Environmental Remediation ◽  
General Structure ◽  
Synthesis Method ◽  
Porous Networks ◽  
Pore Size Distributions ◽  
Solvent Systems ◽  
Cross Linker ◽  
Post Synthesis ◽  
Synthesized Materials

Silsesquioxane-based networks are an important class of materials that have many applications where high thermal/oxidative stability and porosity are needed simultaneously. However, there is a great desire to be able to design these materials for specialized applications in environmental remediation and medicine. To do so requires a simple synthesis method to make materials with expanded functionalities. In this article, we explore the synthesis of R-silsesquioxane-based porous networks by fluoride catalysis containing methyl, phenyl and vinyl corners (R-Si(OEt)3) combined with four different bis-triethoxysilyl cross-linkers (ethyl, ethylene, acetylene and hexyl). Synthesized materials were then analyzed for their porosity, surface area, thermal stability and general structure. We found that when a specified cage corner (i.e., methyl) is compared across all cross-linkers in two different solvent systems (dichloromethane and acetonitrile), pore size distributions are consistent with cross-linker length, pore sizes tended to be larger and π-bond-containing cross-linkers reduced overall microporosity. Changing to larger cage corners for each of the cross-linkers tended to show decreases in overall surface area, except when both corners and cross-linkers contained π-bonds. These studies will enable further understanding of post-synthesis modifiable silsesquioxane networks.

scholarly journals Hierarchical H-MOR Zeolite Supported Vanadium Oxide for Dimethyl Ether Direct Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 628 ◽  
Author(s):  
Wenfeng Wang ◽  
Xiujuan Gao ◽  
Ru Feng ◽  
Qi Yang ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Pore Structure ◽  
Dimethyl Ether ◽  
Active Sites ◽  
Synthesis Method ◽  
Product Distribution ◽  
Acid Sites ◽  
Synthesis Methods ◽  
Direct Oxidation ◽  
Post Synthesis

A series of hierarchical H-MOR zeolites with different pore structure were designed and synthesized by alkaline and alkaline-acid post-synthesis methods. The catalytic performance of hierarchical H-MOR zeolite-supported vanadium oxide was investigated for dimethyl ether (DME) direct oxidation. Different pore structures apparently affect the distribution of oxidation product distribution, especially the selectivity of DMMx and CO. The formation of mesopores for 10%V2O5/deAlmm-H-MOR markedly improved the DMMx selectivity up to 78.2% from 60.0%, and more notably, CO selectivity dropped to zero compared to that of 10%V2O5/H-MOR. The hierarchical H-MOR zeolites were confirmed to be successfully prepared by the post-synthesis method. Due to the presence of mesoporous structure, the dispersion of vanadium oxide species was enhanced, which could improve the reducibility of vanadium oxide species and also make better contact with the acid sites of zeolite to exert the synergistic effect of the bifunctional active sites. More importantly, the creation of mesopores was proved to be favorable to the mass transfer of intermediate and products to avoid the occurrence of secondary reaction, which could effectively suppress the formation of by-products. This work is helpful for us to provide a novel insight to design the catalyst with suitable pore structure to effectively synthesize diesel fuel additives from DME direct oxidation.

Tethering functionality to lipid interfaces by a fast, simple and controllable post synthesis method

2019 ◽  
Vol 181 ◽  
pp. 325-332 ◽  
Author(s):  
Carola Hofmann ◽  
Guenter Roth ◽  
Thomas Hirsch ◽  
Axel Duerkop ◽  
Antje J. Baeumner
Keyword(s):  
Synthesis Method ◽  
Post Synthesis

scholarly journals Influence of the nature and environment of manganese in Mn-BEA zeolites on NO conversion in selective catalytic reduction with ammonia

2017 ◽  
Vol 19 (21) ◽  
pp. 13553-13561 ◽  
Author(s):  
R. Baran ◽  
L. Valentin ◽  
J.-M. Krafft ◽  
T. Grzybek ◽  
P. Glatzel ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Synthesis Method ◽  
Reduction Of No ◽  
No Conversion ◽  
Post Synthesis

Manganese-containing BEA zeolites, MnxSiBEA (x = 1–4 wt%) and Mn(I.E.)AlBEA, were prepared by a two-step post-synthesis method and a conventional wet ion-exchange, respectively, and applied as catalysts in the selective catalytic reduction of NO with ammonia (NH3-SCR).

Commercializing the new frontier in DNA writing: Enzymatic synthesis

2020 ◽  
Vol 25 (4) ◽  
Author(s):  
Michael J. Kamdar ◽  
J. William Efcavitch
Keyword(s):  
Dna Synthesis ◽  
Data Storage ◽  
Business Models ◽  
Vaccine Development ◽  
Synthesis Method ◽  
Dna Nanotechnology ◽  
Cost Effective ◽  
Emerging Industries ◽  
High Quality Sequence ◽  
Post Synthesis

This article provides an overview of the emerging technology of enzymatic DNA synthesis, which holds the promise of making the business of writing DNA cost-effective, faster, sustainable, and more accurate compared to the traditional DNA synthesis method of phosphoramidite chemistry. Enzymatic DNA synthesis lends itself to various business models to realize the enormous opportunities across established and emerging industries that can be transformed with the reliable and affordable creation of long, high-quality, sequence specific DNA or, in the case of DNA data storage, the template-independent creation of DNA in nontoxic solutions without the need for post-synthesis processing. This review includes a discussion of potential verticals, such as life sciences – which includes gene editing, synthetic biology, precision medicine, DNA nanotechnology, and RNA vaccine development – as well as DNA data storage. Enzymatic DNA synthesis is being rapidly advanced to a commercial reality, with the first enzymatically synthesized DNA products to enter the market in the next year.

Partial oxidation of methane to synthesis gas over Pt nanoparticles supported on nanocrystalline CeO2 catalyst

2016 ◽  
Vol 6 (12) ◽  
pp. 4601-4615 ◽  
Author(s):  
Rajib Kumar Singha ◽  
Shilpi Ghosh ◽  
Shankha Subhra Acharyya ◽  
Aditya Yadav ◽  
Astha Shukla ◽  
...  
Keyword(s):  
Partial Oxidation ◽  
Synthesis Gas ◽  
Synthesis Method ◽  
Pt Nanoparticles ◽  
Partial Oxidation Of Methane ◽  
Oxidation Of Methane ◽  
Post Synthesis

Pt-nanoparticles supported on CeO2 have been prepared by a post synthesis method (Pt–CeO2PS).

Framework-confined Sn in Si-beta stabilizing ultra-small Pt nanoclusters as direct propane dehydrogenation catalysts with high selectivity and stability

2019 ◽  
Vol 9 (24) ◽  
pp. 6993-7002 ◽  
Author(s):  
Yansu Wang ◽  
Zhong-Pan Hu ◽  
Wenwen Tian ◽  
Lijiao Gao ◽  
Zheng Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Selectivity ◽  
Synthesis Method ◽  
Propane Dehydrogenation ◽  
High Catalytic Activity ◽  
Pt Nanoclusters ◽  
Post Synthesis ◽  
Excellent Stability

Highly stable Pt/Sn-Si-beta catalysts were prepared via an improved post-synthesis method, exhibiting high catalytic activity, good selectivity and excellent stability for propane dehydrogenation to propene.

Electrochemical properties of SnO2 nanoparticles immobilized within a metal–organic framework as an anode material for lithium-ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (103) ◽  
pp. 84662-84665 ◽  
Author(s):  
Buxue Wang ◽  
Ziqi Wang ◽  
Yuanjing Cui ◽  
Yu Yang ◽  
Zhiyu Wang ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Lithium Ion Battery ◽  
Sno2 Nanoparticles ◽  
Metal Organic Framework ◽  
Synthesis Method ◽  
Lithium Ion ◽  
Metal Organic ◽  
Post Synthesis ◽  
Battery Anode

SnO2 nanoparticles have been immobilized within MIL-101(Cr) crystals through a post-synthesis method for a lithium-ion battery anode.

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