Month: March 2021

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, Name: 2-(2-Bromoethyl)-1,3-dioxolane18742-02-4, Name is 2-(2-Bromoethyl)-1,3-dioxolane, SMILES is C(C1OCCO1)CBr, belongs to copper-catalyst compound. In a article, author is Nam, Ki Bok, introduce new discover of the category.

The role of copper in the enhanced performance of W/Ti catalysts for low-temperature selective catalytic reduction

The influence of copper (Cu) on the performance of a selective catalytic reduction (SCR) WOx/TiO2 catalyst was investigated. The properties of the catalysts were investigated by Brunauer-Emmett-Teller (BET) analysis, Raman spectroscopy, temperature programmed desorption (TPD), temperature programmed reduction (TPR), in-situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTs), and X-ray photoelectron spectroscopy (XPS). The addition of Cu led to an interaction between the octahedral WOx species in W/TiO2 catalysts, which increased the redox capacities of the catalysts, thereby enhancing the low-temperature performance of the catalysts at <= 350 degrees C. In contrast, the addition of Cu above certain content (similar to 1.0 wt%) resulted in the generation of polymerized or bulk CuOx, which inhibited the enhancement of low-temperature performance. Furthermore, the increased capacity for oxidation resulted in increased rates of NH3 oxidation, which reduced the performance of the catalyst in the high-temperature region at temperatures exceeding 500 degrees C. The adsorption characteristics of the W-Cu/TiO2 catalyst following the addition of Cu exhibited a decrease in Brunsted-acid sites while an increase in Lewis-acid sites. Moreover, by inhibiting the production of adsorption NOx species, such as monodentate nitrate, while inducing physical adsorption of NOx, resulted in the generation of NO2(ad), thereby promoting the 'Fast SCR' on the catalyst. Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions. you can also check out more blogs about 18742-02-4. Name: 2-(2-Bromoethyl)-1,3-dioxolane.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

 

Related Products of 14347-78-5, As an important bridge between the micro and macro material world, chemistry is one of the main methods and means for humans to understand and transform the material world. 14347-78-5, Name is (R)-(2,2-Dimethyl-1,3-dioxolan-4-yl)methanol, SMILES is OC[C@H]1OC(C)(C)OC1, belongs to copper-catalyst compound. In a article, author is Zhou, Ying, introduce new discover of the category.

Kinetic identification of three metal ions by using a Briggs-Rauscher oscillating system

In this paper, a kinetic method for identification of metal ions (Fe3+, Cu2+ and Ag+) was reported by using their perturbation effects on a Briggs-Rauscher (BR) oscillating system involving a tetraazamacrocyclic complex [NiL] (ClO4)(2) as a catalyst. The ligand (L) in the catalyst is 5,7,7,12,14, 14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. When an equal amount of analytes (metal ions) were separately added to the active BR system under the same concentration, quite different perturbation results were obtained in their concentration ranges from 1.0 x 10(-4) to 2.0 x 10(-3) mol/L. Furthermore, based on the FCA and NF models, the perturbation mechanisms of three metal ions on BR system were explained in details. It is shown that the different perturbation manners are attributed to kinetic-controlled mechanisms. Such mechanisms suggested that both Fe3+ and Cu2+ may face a competitive reaction with IO3- to form iodate precipitate when they react with I- (an intermediate in BR system) vs redox reaction, whereas Ag+ directly binds to Ito generate AgI without a competitive reaction which yields iodate precipitate. Also, the method could be used for quantitative determination of Ag+.

Related Products of 14347-78-5, Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. I hope my blog about 14347-78-5 is helpful to your research.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

 

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time. 16606-55-6, Name is (R)-4-Methyl-1,3-dioxolan-2-one, formurla is C4H6O3. In a document, author is Fang, Liping, introducing its new discovery. Product Details of 16606-55-6.

New insights into stoichiometric efficiency and synergistic mechanism of persulfate activation by zero-valent bimetal (Iron/Copper) for organic pollutant degradation

Extensive studies have been devoting to investigating the catalytic efficiency of zero-valent iron (Fe-0)-based bimetals with persulfate (PS), while little is known in the stoichiometric efficiency, underlying mechanisms and reaction center of zero-valent bimetallic catalysts in activating PS. Herein, nanoscale zero-valent Fe/Cu catalysts in decomposing 2,4-dichlorophenol (DCP) have been investigated. The results show that the increase of Cu ratio from 0 to 0.75 significantly enhances the DCP degradation with a rate constant of 0.025 min(-1) for Fe-0 to 0.097 min(-1) for Fe/Cu(0.75) at pH similar to 3.3, indicating Cu is likely the predominate reaction centers over Fe. The PS decomposition is reduced with the increase of Cu ratios, suggesting the stoichiometric efficiency of Fe/Cu in activating PS is notably enhanced from 0.024 for Fe-0 to 0.11 for Fe/Cu(0.75). Analyses indicate Cu atoms are likely the predominant reaction site for DCP decomposition, and Fe atoms synergistically enhance the activity of Cu as indicated by DFT calculations. Both SO4 center dot- and (OH)-O-center dot radicals are responsible for reactions, and the contribution of SO4 center dot- is decreased at higher pH conditions. The findings of this work provide insight into the stoichiometric efficiency and the reaction center of Fe/Cu catalysts to activate PS for pollutant removals.

If you are hungry for even more, make sure to check my other article about 16606-55-6, Product Details of 16606-55-6.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

 

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 14347-78-5, Name is (R)-(2,2-Dimethyl-1,3-dioxolan-4-yl)methanol, SMILES is OC[C@H]1OC(C)(C)OC1, in an article , author is Lu, Chenyang, once mentioned of 14347-78-5, COA of Formula: C6H12O3.

Copper-Based Catalysts for Selective Hydrogenation of Acetylene Derived from Cu(OH)(2)

Replacing precious metals with cheap metals in catalysts is a topic of interest in both industry and academia but challenging. Here, a selective hydrogenation catalyst was prepared by thermal treatment of Cu(OH)(2) nanowires with acetylene-containing gas at 120 degrees C followed by hydrogen reduction at 150 degrees C. The characterization by means of transmission electron microscopy observation, X-ray diffraction, and X-ray photoelectron spectroscopy revealed that two crystallites were present in the resultant catalyst. One of the crystal phases was metal Cu, whereas the other crystal phase was ascribed to an interstitial copper carbide (CuxC) phase. The reduction of freshly prepared copper (II) acetylide (CuC2) at 150 degrees C also afforded the formation of Cu and CuxC crystallites, indicating that CuC2 was the precursor or an intermediate in the formation of CuxC. The prepared catalysts consisting of Cu and CuxC exhibited a considerably high hydrogenation activity at low temperatures in the selective hydrogenation of acetylene in the ethylene stream. In the presence of a large excess of ethylene, acetylene was completely converted at 110 degrees C and atmospheric pressure with an ethane selectivity of <15%, and the conversion and selectivity were constant in a 260 h run. Interested yet? Read on for other articles about 14347-78-5, you can contact me at any time and look forward to more communication. COA of Formula: C6H12O3.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

 

In an article, author is Garino, Nadia, once mentioned the application of 16606-55-6, Computed Properties of C4H6O3, Name is (R)-4-Methyl-1,3-dioxolan-2-one, molecular formula is C4H6O3, molecular weight is 102.09, MDL number is MFCD00798265, category is copper-catalyst. Now introduce a scientific discovery about this category.

Facilely synthesized nitrogen-doped reduced graphene oxide functionalized with copper ions as electrocatalyst for oxygen reduction

Nitrogen-doped reduced graphene oxide is successfully synthesized and functionalized with hydroxylated copper ions via one-pot microwave-assisted route. The presence of cationic Cu coordinated to the graphene layer is fully elucidated through a set of experimental characterizations and theoretical calculations. Thanks to the presence of these hydroxyl-coordinated Cu2+ active sites, the proposed material shows good electrocatalytic performance for the oxygen reduction reaction, as evidenced by an electron transfer number of almost 4 and by high onset and half-wave potentials of 0.91V and 0.78V vs. the reversible hydrogen electrode, respectively. In addition, the N-doped Cu-functionalized graphene displays a superior current retention with respect to a commercial Pt/C catalyst during the stability test, implying its potential implementation in high-performance fuel cells and metal-air batteries.

If you are interested in 16606-55-6, you can contact me at any time and look forward to more communication. Computed Properties of C4H6O3.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

 

In an article, author is Treacy, Sean M., once mentioned the application of 2568-25-4, Category: copper-catalyst, Name is Benzaldehyde Propylene Glycol Acetal, molecular formula is C10H12O2, molecular weight is 164.2, MDL number is MFCD00059732, category is copper-catalyst. Now introduce a scientific discovery about this category.

Copper Catalyzed C(sp(3))- H Bond Alkylation via Photoinduced Ligand-to-Metal Charge Transfer

Utilizing catalytic CuCl2 we report the functionalization of numerous feedstock chemicals via the coupling of unactivated C(sp(3))-H bonds with electron-deficient olefins. The active cuprate catalyst undergoes Ligand-to-Metal Charge Transfer (LMCT) to enable the generation of a chlorine radical which acts as a powerful hydrogen atom transfer reagent capable of abstracting strong electron-rich C(sp(3))-H bonds. Of note is that the chlorocuprate catalyst is an exceedingly mild oxidant (0.5 V vs SCE) and that a proposed protodemetalation mechanism offers a broad scope of electron-deficient olefins, offering high diastereoselectivity in the case of endocyclic alkenes. The coupling of chlorine radical generation with Cu reduction through LMCT enables the generation of a highly active HAT reagent in an operationally simple and atom economical protocol.

If you are interested in 2568-25-4, you can contact me at any time and look forward to more communication. Category: copper-catalyst.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

 

Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 2568-25-4, Name is Benzaldehyde Propylene Glycol Acetal, molecular formula is C10H12O2, belongs to copper-catalyst compound. In a document, author is Pavlets, A. S., introduce the new discover, SDS of cas: 2568-25-4.

A novel strategy for the synthesis of Pt-Cu uneven nanoparticles as an efficient electrocatalyst toward oxygen reduction

Electrocatalysts based on Pt-M bimetallic nanoparticles deposited on carbon supports have already been used in commercially available Proton Exchanged Membrane Fuel Cells (PEM FC). Nevertheless, production and practical use of such materials faces with the problems caused by the need to combine high specific activity in current-forming reactions and their durability, with the stability of the elements composition during the operation of PEM FC. The suggested stepwise approach to the PtCu/C materials synthesis in the liquid phase is based on the initial deposition of platinum nuclei and their subsequent growth due to the joint or sequential deposition of copper and platinum from the solutions of their precursors. The PtCu/C catalysts, obtained in this way, demonstrated not only higher activity in oxygen reduction reaction compared to the commercial Pt/C catalyst, but also a significantly higher corrosion-morphological stability. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law. In my other articles, you can also check out more blogs about 2568-25-4. SDS of cas: 2568-25-4.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

 

Application of 14347-78-5, Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. 14347-78-5, Name is (R)-(2,2-Dimethyl-1,3-dioxolan-4-yl)methanol, SMILES is OC[C@H]1OC(C)(C)OC1, belongs to copper-catalyst compound. In a article, author is Tountas, Athanasios A., introduce new discover of the category.

Continuous reactor for renewable methanol

For society and corporations to decisively shift to fossil fuel alternatives and avoid the likely devastating consequences of climate change and ecosystem destruction of ‘business-as-usual’, a renewable pathway to carbon net-neutral or net-negative feedstocks is of utmost importance. Methanol (MeOH) is a promising candidate but is still produced with conventional natural gas to syngas technology. The need for fossil-free and less costly syngas routes to MeOH has been the focus of immense academic effort. Towards this end, this study details a version 1.0 tool for investigating prospective photochemical and thermal heterogeneous MeOH synthesis catalysts and present thermal benchmarking data with a commercial copper-zinc oxide-alumina (CZA) catalyst. The testing conditions use a 3 : 1 H-2 : CO2 syngas ratio, temperatures from <448-533 K (<175-260 degrees C), and pressure up to 0.78 MPa. These conditions allow for more efficient CO2 utilization by improving low-temperature MeOH yield and reducing capital and operating costs of process equipment. The reactor performance is validated with respect to the literature and also a rate model based on a Langmuir-Hinshelwood-Hougen-Watson (LHHW) mechanism with good agreement. This verifies that the system behaves isothermally and predictably. This unique system can be configured to screen catalysts both thermally and with light, and expanded to commercial test conditions and scales. At aspirational low-temperature and low-pressure conditions, 398 K (125 degrees C) and 1.0 MPa (comparable P to this study), the MeOH equilibrium per-pass yield is a respectable 8.8 mol% with comparable high-P equipment costs to current commercial operations. Application of 14347-78-5, Each elementary reaction can be described in terms of its molecularity, the number of molecules that collide in that step. The slowest step in a reaction mechanism is the rate-determining step.you can also check out more blogs about 14347-78-5.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

 

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 14347-78-5, Name is (R)-(2,2-Dimethyl-1,3-dioxolan-4-yl)methanol, molecular formula is C6H12O3. In an article, author is Benhammada, Abdenacer,once mentioned of 14347-78-5, SDS of cas: 14347-78-5.

Green synthesis of CuO nanoparticles using Malva sylvestris leaf extract with different copper precursors and their effect on nitrocellulose thermal behavior

In this work, we have synthesized copper oxide nanoparticles (CuO NPs) by a precipitation method using leaf extract of Malva sylvestris as a stabilizing agent and three different copper precursors. The obtained CuO NPs have been characterized in detail by X-ray diffraction, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, and scanning electron microscopy. The as-prepared CuO NPs present the same pure chemical composition and belong to a monoclinic crystalline phase, with a spherical shape and crystallite diameter in the range of 19-26 nm, according to their precursors. Based on the differential scanning calorimetry (DSC) analyses performed at different heating rates, the thermal behavior of pure nitrocellulose (NC) and NC-CuO NPs composites has been investigated using four integral isoconversional kinetic methods. The obtained results show that, whatever the precursor, CuO NPs could be safely used as a catalyst for NC. Moreover, the added nanocatalysts could reduce the activation energy and slightly decrease the peak temperature. Finally, the thermal decomposition process of both NC and NC-CuO composites determined with Kissinger-Akahira-Sunose and Flynn-Wall-Ozawa) models, respectively, is classified as R2, contracting cylinder g (alpha) = 1 – (1 – alpha)(1/2), whereas that of Trache-Abdelaziz-Siwani integral model is ascribed to F-1/3 and F-3/4 chemical reaction g (alpha) = 1 – (1 – alpha)(2/3).

Interested yet? Keep reading other articles of 14347-78-5, you can contact me at any time and look forward to more communication. SDS of cas: 14347-78-5.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

 

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 14347-78-5, Name is (R)-(2,2-Dimethyl-1,3-dioxolan-4-yl)methanol, SMILES is OC[C@H]1OC(C)(C)OC1, in an article , author is Kazmierczak, Kamila, once mentioned of 14347-78-5, COA of Formula: C6H12O3.

Activity of heterogeneous supported Cu and Ru catalysts in acceptor-less alcohol dehydrogenation

Acceptor-less alcohol dehydrogenation reaction allows the co-production of added-value carbonyl compounds and H-2 from alcohols. Focusing on supported Ru and Cu catalysts, we evaluated the support effect on the dehydrogenation of 2-octanol and 1-octanol and identified the side products as resulting from aldolisation coupling. The most active and selective catalysts were then tested on the aliphatic vicinal-diol octan-1,2-diol and the highest conversion was reached using Cu/ZrO2 (60%) with a high selectivity (94%) towards 1-hydroxy-2-octanone.

Interested yet? Read on for other articles about 14347-78-5, you can contact me at any time and look forward to more communication. COA of Formula: C6H12O3.

Reference:
Copper catalysis in organic synthesis – NCBI,
,Special Issue “Fundamentals and Applications of Copper-Based Catalysts”