UPRM-5 titanium silicates prepared using tetrapropylammonium and tetrabutylammonium cations: framework stability, textural properties, and carbon dioxide adsorption

Marcano-González, Marietta E.; Primera-Pedrozo, José N.; Jiménez-Laureano, Zulmarie; Fu, Riqiang; Hernández‐Maldonado, Arturo J.

doi:10.1007/s10853-012-6978-x

Cited by 4 publications

(19 citation statements)

References 44 publications

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“…According to standard X-ray diffraction (XRD) measurements made for UPRM-5, 6,8,15,16 the material should possess a structure substantially different from that of ETS-4, 1,3 but still related to the Zorite mineral. 17,18 Comparisons made between Zorite and ETS-4 have led to several reports spanning nearly a decade now.…”

Section: ■ Introductionmentioning

confidence: 99%

Determination of the Apparent Crystal Structure of a Highly Faulted UPRM-5 Type Flexible Porous Titanium Silicate via a Polymorph Based Superposition Model, a Rietveld Refinement and a Pair Distribution Function

et al. 2014

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The crystal structure of a UPRM-5 titanium silicate prepared using tetraethylammonium (TEA + ) has been approximated using a superposition model product of a polymorph stacking and a dual-phase Rietveld refinement method. Na + -UPRM-5 polymorphs were employed to elucidate the level of polymorphism or faulting in the crystal structure. DIFFaX simulations revealed that it was impossible to match the experimental diffraction data based solely on "pure" polymorphs. Instead, an intergrowth of combinations of polymorphs in the a and c directions resulted in the best faulting simulation scenario. The most suitable model combined two (2) orthorhombic polymorphs with faulting of 90 and 10% in the a and c directions, respectively. A refinement using this model did not yield a reliable structure, but an approximation was possible after employing a combination of orthorhombic and faulted triclinic phases. The superposition model, however, was not able to predict the final configuration of the TiO 5 plausibly due to the unprecedented level of faulting in the structure. Upon convergence (χ 2 = 13.68), the triclinic phase accounted for ca. 14% (molar basis) of the overall phase, being this further evidence of the level of faulting present in UPRM-5. The refined structure also revealed Si−O and Ti−O distances and angles that contrast with those reported for a titanium silicate known as ETS-4, and related to structural distortion. These changes are plausibly attributed to the presence of the TEA + cations and the strong interaction of the framework oxygen with sodium cations, which were also exposed to the 8MR pore channel as described by a pair distribution function (PDF) refinement. In general, the UPRM-5 structural features appear to commensurate well with the gas adsorption and thermal stability properties previously reported, which differ considerably from those exhibited by Zorite type titanium silicates prepared in the absence of a quaternary ammonium cation.

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Section: ■ Introductionmentioning

confidence: 99%

Determination of the Apparent Crystal Structure of a Highly Faulted UPRM-5 Type Flexible Porous Titanium Silicate via a Polymorph Based Superposition Model, a Rietveld Refinement and a Pair Distribution Function

et al. 2014

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“…Emissions of CO2 from industrial, agricultural, residential and commercial activities [1,2] are major sources of climate change. They have gained attention in recent years [3] as the concentration of CO2 increases from 278 ppm to about 405 ppm from 1970 to 2017 as measured by Global Monitoring Division of NOAA/Earth System Research Laboratory [4].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Carbon Dioxide by Reusing Drinking Water Treatment Plant Sludge

Yusuff¹,

Ong²,

Yunus³

et al. 2017

Asian J. Chem.

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Cost effective, easy to use and regenerate could be the desired properties of an adsorbent. Reusing of waste material as CO2 adsorbent can be a good alternative for solving the problem of waste disposal as well. Thus, in this study, aluminium-based drinking water treatment plant sludge as carbon dioxide adsorbent was reused. The sludge collected from a local drinking water treatment plant. It was dried and characterized using scanning electron microscope-energy disperse X-ray (SEM-EDX), Fourier transform infrared spectrometer (FTIR) and thermogravimetric analysis (TGA). Investigations of the effects of temperature, flow rate, concentration of CO2 and adsorbent dosage on CO2 adsorption capacity were performed using a fixed bed column at a pressure of 1 bar. The maximum capacity of 32.56 mg/g was found which was higher than that of some reported adsorbents.

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“…Marcano-Gonzaĺez and Hernańdez-Maldonado also found that the UPRM-5 textural properties as well as thermal stability can be modified and controlled depending on the level of faulting in the structure, which can be adjusted depending on the type of quaternary ammonium cation employed as structure directing agent (SDA). 35 For instance, the use of tetrapropylammonium (TPA + ) and tetrabutylammonium (TBA + ) improved the UPRM-5 structural and textural characteristics for the adsorption of CO 2 in a considerable fashion. 35 A recent study by Yu et al also showed the potential of using Sr 2+ -UPRM-5 prepared with tetraethylammonium (TEA + ) for the selective N 2 removal in natural gas upgrading.…”

Section: ■ Introductionmentioning

confidence: 99%

“…35 For instance, the use of tetrapropylammonium (TPA + ) and tetrabutylammonium (TBA + ) improved the UPRM-5 structural and textural characteristics for the adsorption of CO 2 in a considerable fashion. 35 A recent study by Yu et al also showed the potential of using Sr 2+ -UPRM-5 prepared with tetraethylammonium (TEA + ) for the selective N 2 removal in natural gas upgrading. 36 The contraction property of UPRM-5 upon thermal treatment was used to reverse selectivity in favor of N 2 , as has been done before for ETS-4.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Furthermore, the two UPRM-5 variants that have showcased the best performance for CO 2 removal so far have been Sr 2+ -UPRM-5 (TPA) and Sr 2+ -UPRM-5 (TBA). 35 Therefore, the present work focuses on the determination of the potential role of UPRM-5 prepared with different degrees of faulting to separate CO 2 /CH 4 based on both equilibrium and kinetic differences. The latter was based on diffusion data gathered using a volumetric transport model corrected for adsorbent particle size polydispersity.…”

Section: ■ Introductionmentioning

confidence: 99%

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Long- and Local-Range Structural Changes in Flexible Titanium Silicates with Variable Faulting upon Thermal Treatment and Corresponding Adsorption and Particle Size Polydispersity-Corrected Diffusion Parameters for CO₂/CH₄ Separation

Marcano-González¹,

Hernández‐Maldonado³

2014

Ind. Eng. Chem. Res.

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Sr 2+ -UPRM-5 is a titanosilicate containing adjustable structural faulting that prescribes changes in textural properties with temperature. In this work, we studied thermally induced structural changes in Sr 2+ -UPRM-5 variants prepared using tetrapropylammonium (TPA + ) and tetrabutylammonium (TBA + ) and their correlation to the diffusion of CO 2 and CH 4 at 25°C. Both Sr 2+ -UPRM-5 materials contained different amounts of structural faulting that are correlated to the formation of 12-MR pores. In situ high-temperature X-ray diffraction revealed structural changes corresponding to orthorhombic phases up to 300°C. Analysis of in situ high-temperature 29 Si magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy revealed new silicon environments surrounding the archetypical Si(2Si, 2Ti oct ) and Si(3Si, 1Ti semioct ) coordination centers. MAS NMR data analysis indicated that the Si environment in Sr 2+ -UPRM-5 (TPA) appears to be more susceptible to changes upon thermal treatment. A phenomenological volumetric transport model corrected for particle size polydispersity was used to estimate diffusion constants at 25°C in adsorbents preactivated at different temperatures. At the optimal conditions, the CO 2 / CH 4 kinetic selectivities were 41 and 30 for Sr 2+ -UPRM-5 (TBA) and (TPA), respectively.

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UPRM-5 titanium silicates prepared using tetrapropylammonium and tetrabutylammonium cations: framework stability, textural properties, and carbon dioxide adsorption

Cited by 4 publications

References 44 publications

Determination of the Apparent Crystal Structure of a Highly Faulted UPRM-5 Type Flexible Porous Titanium Silicate via a Polymorph Based Superposition Model, a Rietveld Refinement and a Pair Distribution Function

Determination of the Apparent Crystal Structure of a Highly Faulted UPRM-5 Type Flexible Porous Titanium Silicate via a Polymorph Based Superposition Model, a Rietveld Refinement and a Pair Distribution Function

Adsorption of Carbon Dioxide by Reusing Drinking Water Treatment Plant Sludge

Long- and Local-Range Structural Changes in Flexible Titanium Silicates with Variable Faulting upon Thermal Treatment and Corresponding Adsorption and Particle Size Polydispersity-Corrected Diffusion Parameters for CO₂/CH₄ Separation

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UPRM-5 titanium silicates prepared using tetrapropylammonium and tetrabutylammonium cations: framework stability, textural properties, and carbon dioxide adsorption

Cited by 4 publications

References 44 publications

Determination of the Apparent Crystal Structure of a Highly Faulted UPRM-5 Type Flexible Porous Titanium Silicate via a Polymorph Based Superposition Model, a Rietveld Refinement and a Pair Distribution Function

Determination of the Apparent Crystal Structure of a Highly Faulted UPRM-5 Type Flexible Porous Titanium Silicate via a Polymorph Based Superposition Model, a Rietveld Refinement and a Pair Distribution Function

Adsorption of Carbon Dioxide by Reusing Drinking Water Treatment Plant Sludge

Long- and Local-Range Structural Changes in Flexible Titanium Silicates with Variable Faulting upon Thermal Treatment and Corresponding Adsorption and Particle Size Polydispersity-Corrected Diffusion Parameters for CO2/CH4 Separation

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Long- and Local-Range Structural Changes in Flexible Titanium Silicates with Variable Faulting upon Thermal Treatment and Corresponding Adsorption and Particle Size Polydispersity-Corrected Diffusion Parameters for CO₂/CH₄ Separation