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266 results for “Catalyst”
Data from: Pd/MCM-41 catalyst for acetylene hydrogenation to ethylene
This study aims to produce ethylene using the calcium carbide route, acetylene from calcium carbide and then selective hydrogenation of the high-concentration acetylene to ethylene. A series of catalysts with different supports, such as Al2O3, SiO2 and MCM-41, were prepared using the ethylene glycol reduction method and their catalytic properties for high-concentration acetylene hydrogenation of calcium carbide to ethylene were studied by transmission electron microscopy, X-ray powder diffraction and thermogravimetry, among others. The results show that the small particle size and uniform dispersion of Pd particles in the Pd/MCM-41 catalyst produced the highest ethylene yield of 62.09%. Then the conditions for the basic reaction, such as reaction temperature and space velocity, were optimized using MCM-41 as a support. The yield of ethylene after condition optimization was as high as 82.87%, while the loading of Pd was 0.1.
Data from: Enhanced low-temperature NH3-SCR performance of Ce/TiO2 modified by Ho catalyst
Holmium was used as a dopant to boost the low-temperature NH3-SCR performance of Ce/TiO2 catalyst. It was ascertained that certain amount Ho-doping species could exceedingly improve the low-temperature SCR activity under 60,000 h-1 of Ce/TiO2, accompanied with the improvement of tolerance to H2O and SO2 at 200 ℃. Characterization results manifested that Ho modification could not only result in inhibiting the growth of TiO2 crystals and the enlargement of surface specific area but also lead to the enhanced redox ability and the increased amount of surface adsorbed substances, all of which could promote the low-temperature NH3-SCR performance of Ce/TiO2.
Data from: Optimization and kinetic study of methyl laurate synthesis using ionic liquid [Hnmp]HSO4 as a catalyst
Methyl laurate was synthesized from lauric acid (LA) and methanol via an esterification reaction using ionic liquids (ILs) as catalysts. The efficiencies of three different catalysts, 1-methylimidazole hydrogen sulfate ([Hmim]HSO4), 1-methyl-2-pyrrolidonium hydrogen sulfate ([Hnmp]HSO4) and H2SO4, were compared. The effect of the methanol/LA molar ratio, reaction temperature, reaction time and catalyst dosage on the esterification rate of LA was investigated by single-factor experiments. Based on the single-factor experiments, the esterification of LA and methanol was optimized using response surface methodology. The results showed that the most effective catalyst was the IL [Hnmp]HSO4. The optimal conditions were as follows: [Hnmp]HSO4 dosage of 5.23%, methanol/LA molar ratio of 7.68 : 1, reaction time of 2.27 h and reaction temperature of 70°C. Under these conditions, the LA conversion of the esterification reached 98.58%. A kinetic study indicated that the esterification was a second-order reaction with an activation energy and a frequency factor of 68.45 kJ mol−1 and 1.9189 × 109 min−1, respectively. The catalytic activity of [Hnmp]HSO4 remained high after five cycles.
Data from: TAPBPR alters MHC class I peptide presentation by functioning as a peptide exchange catalyst
Our understanding of the antigen presentation pathway has recently been enhanced with the identification that the tapasin-related protein TAPBPR is a second MHC I-specific chaperone. We sought to determine whether, like tapasin, TAPBPR can also influence MHC I peptide selection by functioning as a peptide exchange catalyst. We show that TAPBPR can catalyse the dissociation of peptides from peptide-MHC I complexes, enhance the loading of peptide-receptive MHC I molecules, and discriminate between peptides based on affinity in vitro. In cells, the depletion of TAPBPR increased the diversity of peptides presented on MHC I molecules, suggesting that TAPBPR is involved in restricting peptide presentation. Our results suggest TAPBPR binds to MHC I in a peptide-receptive state and, like tapasin, works to enhance peptide optimisation. It is now clear there are two MHC class I specific peptide editors, tapasin and TAPBPR, intimately involved in controlling peptide presentation to the immune system.
Data from: Sulfur resistance of Ce-Mn/TiO2 catalysts for low-temperature NH3–SCR
Ce-Mn/TiO2 catalyst prepared using a simple impregnation method demonstrated a better low-temperature selective catalytic reduction of NO with NH3 (NH3-SCR) activity in comparison with the sol-gel method. The Ce-Mn/TiO2 catalyst loading with 20% Ce had the best low-temperature activity and achieved a NO conversion rate higher than 90% at 140-260°C with a 99.7% NO conversion rate at 180 °C. The Ce-Mn/TiO2 catalyst only had a 6% NO conversion rate decrease after 100 ppm of SO2 was added to the stream. When the SO2 was removed from the stream, the catalyst was able to recover completely. The crystal structure, morphology, textural properties, and valence state of the metals involving the novel catalysts were investigated using X-ray diffraction (XRD), N2 adsorption and desorption analysis, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS), respectively. The decrease of NH3-SCR performance in the presence of 100 ppm SO2 was due to the decrease of the surface area, change of the pore structure, the decrease of Ce4+ and Mn4+ concentration, and the formation of the sulfur phase chemicals which blocked the active sites and changed the valence status of the elements.
DETERMINATION OF THE INFLUENCE OF THE COMPOSITION OF CATALYSTS ON THE CATALYTIC CHARACTERISTICS
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DEVELOPMENT OF HYBRID CATALYST AND SYNTHESIS OF LIQUID HYDROCARBONS BASED ON THEM
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Catalytic activity of triflogallate IL catalyst - NCN project OPUS, grant no. 2020/37/B/ST8/00693.
<p>Dataset contains results obtained during the NCN project OPUS, grant no. 2020/37/B/ST8/00693. The file presents the catalytic activity of triflogallate (III) IL catalyst in cycloaddition between methyl/ethyl acrylate and cyclopentadiene.</p>
Catalyst-free MBE growth of Monocrystalline PbSnTe nanowires with tunable aspect ratio
<p>Link to the image analysis software: <a title="https://github.com/mcpim/APIMs" href="https://github.com/mcpim/APIMs">https://github.com/mcpim/APIMs</a></p>
RECOVERY OF HIGH MOLECULAR HYDROCARBONS FROM SYNTHESIS GAS AND PHYSICO-CHEMICAL CHARACTERISTICS OF THE CATALYST
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Schrock molybdenum alkylidene catalyst enables selective formation of macrocyclic unsaturated lactones by ring-closing metathesis at high-concentration
<p>Data supporting findings described in Green Chemistry, 2023, 25, 2299-2304. <a title="Link to landing page via DOI" href="https://doi.org/10.1039/D2GC02988J">https://doi.org/10.1039/D2GC02988J</a></p> <p>The research was performed within OPUS project and was funded by National Science Centre, Poland, grant number DEC-2019/33/B/ST4/00874.</p>
Block copolymer micelles as colloidal catalysts for photocatalytic NAD+ reduction
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Multistep screening of transition metal based homonuclear double atom catalysts to unravel the electronic origin of their activity and selectivity challenges for nitrogen reduction.
<p><span>Lack of robust catalyst design strategies for tackling the selectivity and activity challenges poses serious limitations in the development of efficient catalysts for nitrogen reduction to ammonia. The synergistic interactions in double-atom catalysts (DACs) have aroused great interest in developing promising catalytic centers for nitrogen-reduction reaction (NRR). Using a multistep screening strategy based on systematic first-principles simulations, we find that Fe<sub>2</sub>, Co<sub>2,</sub> and W<sub>2</sub> dimer species impregnated in <span>tetracyanoquinodimethane</span> based monolayer achieve suitable adsorption behaviour for the various NRR intermediates leading to excellent activity and selectivity among the 27 DACs considered in this study for NRR. Here we have uploaded input and output files of studied catalysts and reaction intermediates of NRR</span></p>
Electro-Asymmetric.Data_New Organic Catalysts _Experimental_Characterization.V1.1
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Multistep screening of transition metal based homonuclear double atom catalysts to unravel the electronic origin of their activity and selectivity challenges for nitrogen reduction.
<p>We have uploaded input and output files of studied TM2@TCNQ catalysts and NRR intermediates</p>
Transcript Strategic Alliances as a Catalyst for Sustainable Growth: A Case Study of the Indonesian Cosmetics Industry
<p>Consist of interview guide, transcript, code, triangulation and research protocol</p>
From e-waste to green catalyst: Gold-loaded covalent organic framework catalyzes carboxylation of terminal alkynes
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Supported Binuclear Gold Phosphine Complexes as CO Oxidation Catalysts: Insights into the Formation of Surface-Stabilized Au Particles
<p>Data concerning the manuscript "Supported Binuclear Gold Phosphine Complexes as CO Oxidation Catalysts: Insights into the Formation of Surface-Stabilized Au Particles", published in Small Science 2024 (DOI: <a href="https://doi.org/10.1002/smsc.202400345">10.1002/smsc.202400345</a>), data sets includes analytical data (XAS, IR, PXRD, BET, ICP-OEC) and catalytic data</p>
Data from: BNPd single-atom catalysts for selective hydrogenation of acetylene to ethylene: a density functional theory study
The mechanisms of selective hydrogenation of acetylene to ethylene on B11N12Pd single-atom catalyst (SAC) was investigated through the density functional theory by using 6-31++G basis set. We studied the adsorption characteristics of H2 and C2H2, and simulated the reaction mechanism. We have discovered that H2 absolutely dissociative chemisorption on single atom Pd and formed the B11N12Pd(2H) dihydride complex and then proceed the hydrogenation reaction with C2H2. The hydrogenation reaction of acetylene onto the B11N12Pd complies with the Horiuti-Polanyi mechanism, and the energy barrier as low as 26.55 kcal mol-1. The low desorption energy of ethylene, high ethylene hydrogenation activation energy can ensure the B11N12Pd SAC has high selectivity. Meanwhile it also has a higher selectivity than many bimetallic alloy single-atom catalyst.
Catalyst-Controlled Transannular Polyketide Cyclization Cascades: Selective Folding of Macrocyclic Polyketides
<p>Data underlying the figures in the publication “Catalyst-Controlled Transannular Polyketide Cyclization Cascades: Selective Folding of Macrocyclic Polyketides”, published in <em>Angew. Chem. Int. Ed.,</em> <strong>2020</strong>, 59, 18390–18394. <a href="https://onlinelibrary.wiley.com/doi/10.1002/anie.202005733">https://onlinelibrary.wiley.com/doi/10.1002/anie.202005733</a></p> <p>Table of contents:</p> <p><strong>1. Dataset</strong>; Word file containing: synthesis, experimental data, general procedures for the preparation of the catalyst, overview and methodology for nonreduced transannular polyketide cyclizations, selectivity, methodology and overview of transannular polyketide cyclization cascades (partially reduced), and NMR & X-ray data of the compounds in the publication.</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.