scholarly journals Hybrid chemoenzymatic heterogeneous catalyst prepared in one step from zeolite nanocrystals and enzyme–polyelectrolyte complexes

2021 ◽  
Vol 3 (6) ◽  
pp. 1646-1655 ◽  
Author(s):  
Margot Van der Verren ◽  
Valentin Smeets ◽  
Aurélien vander Straeten ◽  
Christine Dupont-Gillain ◽  
Damien P. Debecker
Keyword(s):  
Glucose Oxidase ◽  
Heterogeneous Catalyst ◽  
Allyl Alcohol ◽  
Polyelectrolyte Complexes ◽  
One Step ◽  
Allyl Alcohol Epoxidation ◽  
Spray Dried

A suspension of TS-1 zeolite nanocrystals and glucose oxidase–polyelectrolyte complexes is spray-dried to form, in one step, a hybrid chemo-enzymatic heterogeneous catalyst utilized for the production of H2O2 cascaded with allyl alcohol epoxidation.

scholarly journals Correction: Hybrid chemoenzymatic heterogeneous catalyst prepared in one step from zeolite nanocrystals and enzyme–polyelectrolyte complexes

2021 ◽  
Author(s):  
Margot Van der Verren ◽  
Valentin Smeets ◽  
Aurélien vander Straeten ◽  
Christine Dupont-Gillain ◽  
Damien P. Debecker
Keyword(s):  
Heterogeneous Catalyst ◽  
Polyelectrolyte Complexes ◽  
One Step

Correction for ‘Hybrid chemoenzymatic heterogeneous catalyst prepared in one step from zeolite nanocrystals and enzyme–polyelectrolyte complexes’ by Margot Van der Verren et al., Nanoscale Adv., 2021, DOI: 10.1039/d0na00834f.

scholarly journals The utilization of the mesoporous Ti-SBA-15 catalyst in the epoxidation of allyl alcohol to glycidol and diglycidyl ether in the water medium

2015 ◽  
Vol 17 (4) ◽  
pp. 23-31 ◽  
Author(s):  
Agnieszka Wróblewska ◽  
Edyta Makuch ◽  
Małgorzata Dzięcioł ◽  
Roman Jędrzejewski ◽  
Paweł Kochmański ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Allyl Alcohol ◽  
Water Solution ◽  
Reaction Medium ◽  
Diglycidyl Ether ◽  
Molar Ratio ◽  
Water Medium ◽  
Catalyst Content ◽  
Allyl Alcohol Epoxidation

Abstract This work presents the studies on the optimization the process of allyl alcohol epoxidation over the Ti-SBA-15 catalyst. The optimization was carried out in an aqueous medium, wherein water was introduced into the reaction medium with an oxidizing agent (30 wt% aqueous solution of hydrogen peroxide) and it was formed in the reaction medium during the processes. The main investigated technological parameters were: the temperature, the molar ratio of allyl alcohol/hydrogen peroxide, the catalyst content and the reaction time. The main functions the process were: the selectivity of transformation to glycidol in relation to allyl alcohol consumed, the selectivity of transformation to diglycidyl ether in relation to allyl alcohol consumed, the conversion of allyl alcohol and the selectivity of transformation to organic compounds in relation to hydrogen peroxide consumed. The analysis of the layer drawings showed that in water solution it is best to conduct allyl alcohol epoxidation in direction of glycidol (selectivity of glycidol 54 mol%) at: the temperature of 10–17°C, the molar ratio of reactants 0.5–1.9, the catalyst content 2.9–4.0 wt%, the reaction time 2.7–3.0 h and in direction of diglycidyl ether (selectivity of diglycidyl ether 16 mol%) at: the temperature of 18–33°C, the molar ratio of reactants 0.9–1.65, the catalyst content 2.0–3.4 wt%, the reaction time 1.7–2.6 h. The presented method allows to obtain two very valuable intermediates for the organic industry.

One-step synthesis of a heterogeneous catalyst by the hydrothermal carbonization of acai seed

2021 ◽  
Author(s):  
Rayanne O. Araujo ◽  
Vanuza O. Santos ◽  
Flaviana C. P. Ribeiro ◽  
Jamal da S. Chaar ◽  
Newton P. S. Falcão ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Hydrothermal Carbonization ◽  
One Step

Kinetics of Allyl Alcohol Epoxidation with Hydrogen Peroxide Catalyzed by a TS-1/Al2O3

2019 ◽  
Vol 149 (11) ◽  
pp. 3076-3086
Author(s):  
A. Sulimov ◽  
A. Ovcharova ◽  
A. Ovcharov ◽  
J. Sulimova
Keyword(s):  
Hydrogen Peroxide ◽  
Allyl Alcohol ◽  
Kinetics Of ◽  
Allyl Alcohol Epoxidation

Effect of Sintering Conditions on Mechanical and Optical Properties of 3Y-TZP Dental Ceramic

2014 ◽  
Vol 608 ◽  
pp. 181-186
Author(s):  
Kannigar Dateraksa ◽  
Sukunthakan Ngernbamrung ◽  
Ryan C. McCuiston
Keyword(s):  
Fracture Toughness ◽  
Optical Properties ◽  
High Strength ◽  
Dental Ceramics ◽  
Heating Rates ◽  
Microstructural Characteristics ◽  
One Step ◽  
Sintering Conditions ◽  
Dental Applications ◽  
Spray Dried

The use of zirconia dental ceramics has grown in recent years due to improvements in esthetics and biocompatibility. Zirconia is used in dental applications for its high strength and fracture toughness. In this research, the influence of sintering conditions on the strength and optical properties of zirconia was investigated. Spray dried granules of 3Y-TZP zirconia were die pressed into disc-shaped samples and cold isostatic pressed at 250 MPa. Sintering was conducted using either one step sintering at 1500 oC or two-step sintering, with pre-sintering at 1200 oC and final sintering at 1500 oC. Heating rates of 2 and 10 oC/min were used. The biaxial flexural strength, fracture toughness, density, microstructural characteristics and optical properties of the sintered samples were determined. It was found that the sintering conditions did appear to influence the mechanical and optical properties. The sintering conditions had no significant effect on the density. It was concluded that for the sintering conditions examined, the two-step sintering with a heating rate of 2 oC/min produced the best average mechanical and optical properties of 3Y-TZP zirconia.

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