Adsorption of Carbon Dioxide into Amine Functionalized Ordered Mesoporous Materials

2018 ◽  
Author(s):  
Marcela N. Barbosa ◽  
Maria J. F. Costa ◽  
Maricele N. Barbosa ◽  
Valter J. Fernandes Jr. ◽  
Giancarlo R. Salazar-Banda ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Molecular Sieves ◽  
Synthesis Method ◽  
Mesoporous Molecular Sieves ◽  
Carbon Dioxide Adsorption ◽  
X Ray ◽  
Ordered Mesoporous ◽  
Mcm 41

The adsorption of carbon dioxide on amino silanes-functionalized MCM-41 and SBA-15 materials is reported. The functionalization of mesoporous silicas was made by post-synthesis method, by impregnation of 3-aminopropyltriethoxysilane. The obtained materials were characterized by X-ray diffraction, scanning and transmission electron microscopies, nitrogen adsorption-desorption and X-ray photoelectron spectroscopy measurements. The carbon dioxide adsorption capacities for the samples were carried out under ambient pressures. The obtained results evidenced that amino-silanes with a terminal amine (–NH2) were functionalized through covalent coupling of this group on the surface of the channels in the ordered mesoporous silica, meaning that the amine is anchored on the surface of the bigger pores of the MCM-41 and SBA-15 support. For functionalized materials, the CO2 adsorption capacity of the AMCM-41 increased from 0.18 to 1.1 mmol·g−1, whereas for ASBA-15, it was from 0.6 to 1.8 mmol·g−1. The Lagergren kinetic algorithms were applied in order to validate the obtained results, evidencing the enhanced carbon dioxide adsorption capacity and stability of the functionalized ordered mesoporous molecular sieves.

scholarly journals Adsorption of Carbon Dioxide into Amine Functionalized Ordered Mesoporous Materials

2018 ◽  
Author(s):  
Marcela N. Barbosa ◽  
Maria J. F. Costa ◽  
Maricele N. Barbosa ◽  
Valter J. Fernandes Jr. ◽  
Giancarlo R. Salazar-Banda ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Molecular Sieves ◽  
Synthesis Method ◽  
Mesoporous Molecular Sieves ◽  
Carbon Dioxide Adsorption ◽  
X Ray ◽  
Ordered Mesoporous ◽  
Mcm 41

The adsorption of carbon dioxide on amino silanes-functionalized MCM-41 and SBA-15 materiais is reported. The functionalization of mesoporous silicas was made by post-synthesis method, by impregnation of 3-aminopropyltriethoxysilane. The obtained materials were characterized by X-ray diffraction, scanning and transmission electron microscopies, nitrogen adsorption-desorption and X-ray photoelectron spectroscopy measurements. The carbon dioxide adsorption capacities for the samples were carried out under ambient pressures. The obtained results evidenced that amino-silanes with a terminal amine (–NH2) were functionalized through covalent coupling of this group on the surface of the channels in the ordered mesoporous silica, meaning that the amine is anchored on the surface of the bigger pores of the MCM-41 and SBA-15 support. For functionalized materials, the CO2 adsorption capacity of the AMCM-41 increased from 0.18 to 1.1 mmol g−1, whereas for ASBA-15, it was from 0.6 to 1.8 mmol g−1. The Lagergren kinetic algorithms were applied in order to validate the obtained results, evidencing the enhanced carbon dioxide adsorption capacity and stability of the functionalized ordered mesoporous molecular sieves.

Carbon dioxide adsorption and activation on gallium phosphide surface monitored by ambient pressure x-ray photoelectron spectroscopy

2021 ◽  
Vol 54 (23) ◽  
pp. 234002
Author(s):  
Yifan Ye ◽  
Hongyang Su ◽  
Kyung-Jae Lee ◽  
David Larson ◽  
Carlos Valero-Vidal ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Photoelectron Spectroscopy ◽  
Gallium Phosphide ◽  
Ambient Pressure ◽  
Carbon Dioxide Adsorption ◽  
X Ray

scholarly journals MCM-41 ordered mesoporous molecular sieves synthesis and characterization

1999 ◽  
Vol 2 (3) ◽  
pp. 173-179 ◽  
Author(s):  
Rogério A.A. Melo ◽  
Marcus V. Giotto ◽  
João Rocha ◽  
Ernesto A. Urquieta-González
Keyword(s):  
Molecular Sieves ◽  
Mesoporous Molecular Sieves ◽  
Synthesis And Characterization ◽  
Ordered Mesoporous ◽  
Mcm 41

Carbon dioxide adsorption over DIPA functionalized MCM-41 and SBA-15 molecular sieves

2011 ◽  
Vol 106 (3) ◽  
pp. 779-782 ◽  
Author(s):  
Marcela N. Barbosa ◽  
Antonio S. Araujo ◽  
Luzia P. F. C. Galvão ◽  
Edjane F. B. Silva ◽  
Anne G. D. Santos ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Molecular Sieves ◽  
Carbon Dioxide Adsorption ◽  
Mcm 41

scholarly journals Pt Modified Heterogeneous Catalysts Combined with Ozonation for the Removal of Diclofenac from Aqueous Solutions and the Fate of by-Products

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 322 ◽  
Author(s):  
Soudabeh Saeid ◽  
Matilda Kråkström ◽  
Pasi Tolvanen ◽  
Narendra Kumar ◽  
Kari Eränen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Molecular Sieves ◽  
Heterogeneous Catalysts ◽  
Maximum Activity ◽  
Mesoporous Molecular Sieves ◽  
Emission Spectrometry ◽  
Characterization Methods ◽  
X Ray ◽  
By Products

The degradation of the pharmaceutical compound diclofenac in an aqueous solution was studied with an advanced oxidation method, catalytic ozonation. Diclofenac was destroyed in a few minutes by ozonation but several long-lasting degradation by-products were formed. For this reason, the combination of heterogeneous catalysts and ozonation was applied to eliminate them completely. The kinetics of the diclofenac degradation and the formation of by-products were thoroughly investigated. Loading of Pt on the catalysts resulted in an improvement of the activity. The Mesoporous Molecular Sieves (MCM) were one of the promising catalysts for the degradation of organic pollutants. In this study, six heterogeneous catalysts were screened, primarily MCM-22-100 catalysts with different Pt concentrations loaded via the evaporation-impregnation (EIM) method, and they were applied on the degradation of diclofenac. It was found that the presence of Pt improved the degradation of diclofenac and gave lower concentrations of by-products. The 2 wt % Pt-H-MCM-22-100-EIM demonstrated the highest degradation rate compared to the proton form, 1% or 5 wt % Pt concentration, i.e., an optimum was found in between. Pt-H-Y-12-IE and Pt-γ-Al2O3 (UOP)-IMP catalysts were applied and compared with the MCM-22 structure. Upon use of both of these catalysts, an improvement in the degradation of diclofenac and by-products was observed, and the 2 wt % Pt-H-MCM-22-100-EIM illustrated the maximum activity. All important characterization methods were applied to understand the behavior of the catalysts (X-ray powder diffraction, transmission electron microscopy, nitrogen physisorption, scanning electron microscopy, energy dispersive X-ray micro-analyses, pyridine adsorption-desorption with FTIR spectroscopy, X-ray photoelectron spectroscopy). Finally, leaching of Pt and Al were analyzed by inductively coupled optical emission spectrometry.

Microwave Hydrothermal Synthesis of Bimetallic (Ti-V) Ions Modified MCM-41 for Epoxidation of Styrene

2010 ◽  
Vol 1279 ◽  
Author(s):  
Yajie Guo ◽  
Guangjian Wang ◽  
Yuran Wang ◽  
Zhengwang Li ◽  
Guangqing Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
Molecular Sieves ◽  
Magic Angle Spinning ◽  
Mesoporous Molecular Sieves ◽  
Magic Angle ◽  
X Ray ◽  
Microwave Hydrothermal ◽  
Hexagonal Arrangement ◽  
Mcm 41

AbstractMesoporous molecular sieves MCM-41 modified by single (Ti) and bimetal (Ti-V) ions with highly ordered hexagonal arrangement of their cylindrical channels were prepared by direct synthesis under microwave–hydrothermal (M–H) conditions at 403K. Characterizations with powder X-ray diffraction (XRD), 29Si magic-angle spinning (MAS) NMR, N2 adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelcctron spectra(XPS) and transmission electron microscopy (TEM) showed that Ti and V ions were introduced into MCM-41 under M-H conditions and Ti/V-Si bond was formed. Results revealed that all the samples were of a typical hexagonal arrangement of mesoporous structure. The modified materials were high active and selective in the epoxidation of styrene at 343 K in comparison with single-functional MCM-41. Moreover, compared to conventional method, the presented microwave hydrothermal synthesis of molecular sieves greatly improved the selectivity to styrene oxide, e.g., it reached 58.6% at styrene conversion of 18.7% over Ti-V-MCM-41 (50).

Alkylation of p-Cresol with Isobutylene Catalyzed by Heteropoly Acid Supported on MCM-41 Catalyst

2011 ◽  
Vol 356-360 ◽  
pp. 2803-2807 ◽  
Author(s):  
Zai Man Liu ◽  
Pei Pei Deng ◽  
Bai Yu Li
Keyword(s):  
Molecular Sieves ◽  
Heteropoly Acid ◽  
Mesoporous Molecular Sieves ◽  
Reaction Parameters ◽  
Reaction Conditions ◽  
Wet Impregnation ◽  
X Ray ◽  
Tert Butyl ◽  
Temperature Time ◽  
Mcm 41

The phosphorus tungsten(PW) heteropoly acids were immobilized on the mesoporous molecular sieves(MCM-41) by wet impregnation. The prepared catalysts were characterized by X-ray powder diffraction, TG and DTA,FTIR. The alkylation of p-cresol with isobutylene was carried out over the PW /MCM-41 catalysts. The influences of various reaction parameters such as reaction temperature, time, PW loading, and catalysts amount on the conversion of p-cresol and the products selectivity were also investigated. Under the optimized reaction conditions of 90 °C,PW loading of 10%, catalyst amount of 1.5%, p-cresol conversion was found to be 93.89% with product rate to 2-tert-butyl-p-cresol 51.29%, 2,6-di-tert-butyl-p-cresol 42.48% and tert-butyl-p-tolyl ether 0.12%, responding to selectivity of 2, 6-di-tert-butyl-p-cresol 45.24%.

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