Introduction to Co Adsorption
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Co Adsorption sentence examples within density functional theory
In this study, plasmonic properties of transition metal atoms (Sc-Zn, Pd, Pt) adsorbed on various sites of graphene sheets were investigated before and after CO adsorption by density functional theory (DFT).
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Density functional theory calculations are used to study the interaction of uni- and di-molecular CO adsorption with the neutral aromatic magnesium nanoclusters with the centrality of beryllium, magnesium, and calcium Mg16M (M=Be, Mg, and Ca) to examine the potential of these nanomaterials to be used as an adsorbent for CO molecule.
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Co Adsorption sentence examples within diffuse reflectance infrared
This indicates that AlV contributes to the strong metal-support interaction to stabilize the Pt single sites on Pt/ASA, which was characterized by diffuse reflectance infrared Fourier transform spectroscopy combined with CO adsorption, X-ray photoelectron spectroscopy, and electron energy loss spectroscopy.
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Differences in the composition and strength of Lewis acid sites on the surface of two types of Al 2 O 3 lead to dissimilar coordination of nitrate and differences in nickel reducibility, as revealed by TPR, diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy with CO adsorption, and in situ X-ray photoelectron spectroscopy (XPS).
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Co Adsorption sentence examples within ray photoelectron spectroscopy
The prepared catalysts were characterized by N2-physisorption, X-ray diffraction, CO chemisorption, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), in situ diffuse reflectance infrared Fourier transform spectroscopy after CO adsorption (CO-DRIFTS), and temperature-programmed desorption of ammonia (NH3-TPD) and ethanol (ethanol-TPD).
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Moreover, the promoting role of H2O could be mainly attributed to the weakened strength of CO adsorption and the fast interfacial reaction between CO and the surface hydroxyl groups formed via H2O dissociation, as revealed by the X-ray photoelectron spectroscopy, CO temperature-programmed desorption and the kinetic results.
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Co Adsorption sentence examples within transmission electron microscopy
These catalysts were characterized by N 2 sorption, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, infrared spectroscopy of CO adsorption and temperature-programmed reduction.
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However, X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and volumetric CO adsorption suggest that Pd/SiO2 has similar particle sizes as Pd/Al2O3 even after HTA, indicating that Pd/PdO particle sintering is not the origin of the deactivation of Pd/SiO2.
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Co Adsorption sentence examples within temperature programmed desorption
CO adsorption on the MnO(100) surface was studied using temperature programmed desorption (TPD) and density functional theory (DFT).
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The CO gas sensor and temperature programmed desorption (TPD) tests prove that the P-Cu has better CO adsorption and enrichment capacity than C-Cu due to the rich pore structure.
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Co Adsorption sentence examples within situ diffuse reflectance
In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with modulation excitation spectroscopy (MES) demonstrated that CO adsorption occurs first on Au atoms and then, within 80 s, moves onto Pd atoms.
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In situ diffuse reflectance infrared Fourier transform spectroscopy was used to track the CO adsorption processes and to identify the reaction intermediates during CO oxidation.
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Co Adsorption sentence examples within temperature programmed reduction
Hydrogen temperature programmed reduction (H2-TPR) measurements and Fourier-transform infrared (FTIR) spectroscopy following CO adsorption revealed that the quality of the Pd–support oxide interface as well as the surface state of Pd particles are strongly affected by high-temperature engine ageing.
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These catalysts were fully characterized by XRD, SEM, N2 physisorption, temperature programmed reduction and in situ FTIR CO adsorption.
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Co Adsorption sentence examples within High Co Adsorption
Co Adsorption sentence examples within Toward Co Adsorption
The results show that Cu–O2 bridging site shows better activity towards CO adsorption on the O-defective and sulfur-poisoned copper ferrite surfaces.
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Following recent experimental work, we demonstrate that deposition of G on Ni(111) and introduction of N-based defects in the G lattice lead to cooperative effects, determining sizeable chemical reactivity towards CO adsorption.
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Co Adsorption sentence examples within Lower Co Adsorption
Co Adsorption sentence examples within Selective Co Adsorption
The design principles as well as the relationship between the structure and the selective CO adsorption performance are presented.
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Although MIL-100(Fe) adsorbed CO2 better than CO, Cu(I)@MIL-100(Fe) showed selective CO adsorption compared to CO2 owing to π complexation between CO and Cu(I).
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Co Adsorption sentence examples within Different Co Adsorption
Adsorption-desorption experiments establish the strikingly different CO adsorption behavior over monometallic Pt and PtCu alloy nanoparticles.
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The difference in gold status induced different CO adsorption situations that CO was more effectively adsorbed on gold nanoparticles in Au/TiO2-1 0 1 which existed more Au0 site.
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Co Adsorption sentence examples within Promote Co Adsorption
For the mixture, in low feed ratio (P CO/P DME = 1–10), the adsorption capacity of CO in 8-MR cannot meet the reaction requirement caused the low carbonylation activity, while increasing the feed ratio (to P CO/P DME = 20–30) will promote CO adsorption.
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It is found that the addition of GO could not only improve the dispersion of cobalt species, but also act as an electron donor to promote CO adsorption and disassociation on Co species, both leading to a higher catalytic activity.
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Co Adsorption sentence examples within Moderate Co Adsorption
Experiment data combined with density functional calculation (DFT) results demonstrate that Pt cluster with surface Pt−O−Bi structure is the active site for CO oxidation via providing moderate CO adsorption and activating CO molecules with electron transformation between platinum atom and carbon monoxide.
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2 nm, which possess a moderate CO adsorption strength, exhibit the maximum production of CO with the H2/CO ratio of 2/1.
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Co Adsorption sentence examples within Strong Co Adsorption
Multiple characterization studies, control experiments, and density functional theory (DFT) calculation results clarified that Ga doped zeolites with strong CO adsorption capability facilitated the transformation of the reaction intermediate methanol by optimizing the first C–C coupling step under a high-pressure CO atmosphere, thereby driving the reaction forward for aromatics synthesis.
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Such minor O flux reduction is due to the strong CO adsorption on membrane surface occupying the O vacancies without permanent membrane damage, which is fully eliminated by an inert gas purge.
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Co Adsorption sentence examples within Upon Co Adsorption
This result is a slight stabilization of the bottom of the conduction band, which is translated into a reduction of the band gap upon CO adsorption on the clean surfaces.
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These studies suggested that Pd is initially present as either Pd+4 or Pd+3 ions that are reduced to Pd0 metal upon CO adsorption.
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Co Adsorption sentence examples within Investigate Co Adsorption
Herein, spin-polarized density functional theory calculations are performed to investigate CO adsorption and activation on both perfect and defective η-Fe2C surfaces.
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Density functional theory calculations are used to investigate CO adsorption, dissociation and SnOX formation on Pt3Sn.
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Co Adsorption sentence examples within Enhanced Co Adsorption
More importantly, increased -OH and enhanced CO adsorption efficiency on Bi/AgBiS2/P25 surface could enhance CH4 production by providing more available protons and stabilizing more key intermediates for CH4 formation.
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Such improved selectivity for aldehyde might be attributed to the presence of alkali or alkaline earth cations which enhanced CO adsorption, while the high conversion rate of vinyl acetate was likely due to the proper interaction of Lewis acid–base between cations modified TNTs and vinyl acetate.
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Co Adsorption sentence examples within Improved Co Adsorption
Cu (II) was completely reduced to Cu (I) in the MIL-101 (Cr), while maintaining the Ni (II) in the host structures in order to effect the π-complexation between CO and the CuCl-NiCl2 MIL-101 (Cr) sample for improved CO adsorption.
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This was followed by hydrogen reduction at 500 °C in the absence of plasma, and a highly dispersed Ni/CeO2 catalyst was obtained with improved CO adsorption and enhanced metal-support interaction.
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Co Adsorption sentence examples within Improve Co Adsorption
Structural characterizations and theoretical calculations indicate that the high-rate C 2+ production over Cu-CuI is ascribed to the presence of residual Cu + and adsorbed iodine species which improve CO adsorption and facilitate C-C coupling.
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Overall, C-vacancies and atomic N-embedded in graphene supports can effectively improve CO adsorption on cobalt cluster, beneficial for CO conversion in Fischer–Tropsch synthesis.
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Co Adsorption sentence examples within Weak Co Adsorption
In contrast, s-block metal sites possess nondirectional ly delocalized 3s orbits and hence weak CO adsorption ability, providing a promising way to solve the suffered CO desorption issue.
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3 monolayers and then decreased, suggesting that for low Pt coverages the advantage of weak CO adsorption was offset by the effects of weaker formic acid adsorption.
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Co Adsorption sentence examples within Following Co Adsorption
Hydrogen temperature programmed reduction (H2-TPR) measurements and Fourier-transform infrared (FTIR) spectroscopy following CO adsorption revealed that the quality of the Pd–support oxide interface as well as the surface state of Pd particles are strongly affected by high-temperature engine ageing.
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From H2-TPR and FT-IR spectroscopy following CO adsorption, the role of Fe additive was concluded to be the creation of easily reducible Pd species interacting with Fe-doped CeO2-ZrO2 and then to be the stabilization of Pd species in the catalytically active reducing state under the reaction conditions.
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Co Adsorption sentence examples within co adsorption energy
Indeed, FenCum (n + m = 6) are promising clusters to catalyze CO dissociation, particularly Fe3Cu3, Fe5Cu, and Fe6, which have large CO bond lengths and CO adsorption energies.
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The authors proposed that CO adsorption energy on the surface can be a critical component to determine the extent of CO2 reduction on the surface, whereby a low CO adsorption energy was expected to yield primarily C1 products while a very large adsorption energy leads to catalyst poisoning.
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Co Adsorption sentence examples within co adsorption site
It was also found that abundant interfaces can be produced on OD-Cu, which can provide heterogeneous CO adsorption sites (strong binding sites and weak binding sites), leading to outstanding performance for obtaining C2+ products.
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Switching to CO(g) revealed the presence of previously unoccupied CO adsorption sites on Pt via the infrared absorption features between 2075 and 2090 cm−1, assigned to linear-bound CO.
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Co Adsorption sentence examples within co adsorption capacity
The development of a CO-selective adsorbent with large CO adsorption capacity, high CO/CO2 selectivity, and good stability is an industrial challenge.
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Based on electrochemical tests and CO adsorption capacity analyses, the origin of the enhanced catalytic performance can be attributed to the synergistic effect between Ag shell and Cu core, which strengthens the bonding strength of CO on Cu/Ag interfaces, expedites the charge transfer, increases the electrochemical surface areas (ECSAs).
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Co Adsorption sentence examples within co adsorption strength
Co-existence of Ni0 and MoOx (especially MoO2) markedly decreases formation of dimethyl ether (DME) and reversely increases acetyls formation, in nature, due to the catalyst acidity modulation and the partial electron transfer from Ni0 to MoOx that tunes the CO adsorption strength on Ni0 sites.
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, stacking faults and twin boundaries, which improve the CO production rate and *CO adsorption strength.
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Co Adsorption sentence examples within co adsorption behavior
This was identified by the increase of the electronic density of Pd and the changes in CO adsorption behavior.
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Therefore, characterization techniques including FT–IR, XRD, N2 adsorption–desorption, H2–TPR, CO–TPD, CO2–TPD and SEM were carried out to investigate the composition, crystal structure, textural properties, reducibility, alkalinity, CO adsorption behavior and morphology of the ATMP-modified CuZnAl-HTDO and its precursors.
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Co Adsorption sentence examples within co adsorption property
The CO adsorption properties showed distinct differences, with the weakest CO adsorption strength for the most active catalysts.
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Based on the synergetic mechanism of copper-ceria catalysts, highly dispersed copper species and abundant CuOx/CeO2 interfaces in multi-shelled hollow microspheres give rise to the changes of redox properties and CO adsorption properties, and thus result in promoted catalytic performance.
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Co Adsorption sentence examples within co adsorption capability
Data of H2/CO chemisorption showed that the interaction of highly dispersed Co0 with lattice Mn-doped CMA-m grain has a promotive effect on CO adsorption capability.
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Multiple characterization studies, control experiments, and density functional theory (DFT) calculation results clarified that Ga doped zeolites with strong CO adsorption capability facilitated the transformation of the reaction intermediate methanol by optimizing the first C–C coupling step under a high-pressure CO atmosphere, thereby driving the reaction forward for aromatics synthesis.
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Co Adsorption sentence examples within co adsorption band
We identify a CO adsorption band on OD-Cu at 2058 cm–1 that is different from those on Cu-poly but resembles CO bound to the Cu(100) facet.
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The formation of Pt–Co intermetallic bonds allows for electron donation form Co to Pt, leading to the negative charging of the Pt atoms as evidenced by reduced Pt 2p-to-5d electron-transition intensity detected by XAFS spectroscopy and the emergence of a CO adsorption band at 2063 cm–1 in DRIFTS.
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Co Adsorption sentence examples within co adsorption experiment