Basic intensity regulation of layered double oxide for CO2 adsorption process at medium temperature in coal gasification

Wang, Binxia; Zhang, Xinyue; Liu, Yanan; Li, Dianqing; Lin, Yanjun

doi:10.1016/j.cej.2022.136842

Cited by 8 publications

(12 citation statements)

References 42 publications

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“…The exfoliation provided the Ru-based catalysts with more strong basic sites. This observation was in accord with the previous study, which concluded that the presence of intercalating molecules in the modified LDH improved the decomposition and transformation of weakly basic hydroxyl groups into medium and strong basic sites . Accordingly, it can be deduced from this result that the number of unsaturated oxygen ions, with strong basic character, at edges and corners increased, which would be beneficial for activating HMF molecules in the catalytic oxidation into FDCA.…”

Section: Resultssupporting

confidence: 92%

“…25 In addition, exfoliation prevented the reconstruction of LDO into the original stacking layered structure upon exposure to moisture. 26 Notably, it increases the number of medium and strong basic sites, 27 which could be essential in oxidation reactions. To our best knowledge, the exfoliated LDO has not been reported as a support material for Ru-based catalysts in the HMF conversion.…”

Section: ■ Introductionmentioning

confidence: 99%

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Exfoliated Layered Metal Oxide-Supported Ruthenium Catalysts for Base-Free Oxidation of 5-Hydroxymethylfurfural into a Renewable Bioplastic Precursor

Thiensuwan,

Sankaranarayanan,

Yokoi

et al. 2023

ACS Sustainable Chem. Eng.

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2,5-Furandicarboxylic acid (FDCA) is a potential biopolymer precursor for polyethylene furanoate production. This study focused on synthesizing FDCA via catalytic oxidation of 5-hydroxymethylfurfural (HMF) over Ru-based catalysts supported on exfoliated MgAl-double oxides (LDO) for the first time in a homogeneous base-free system. Effects of the exfoliation solvent, preparation method, and Ru loading level on the physicochemical and catalytic properties of the resulting catalysts were investigated. The exfoliated LDO-supported Ru catalysts exhibited enhanced textural properties, RuO x dispersion, and basicity, resulting in better catalytic activity (at least 6 times higher FDCA yield) than conventional LDO-supported Ru catalysts in the conversion into FDCA. The Ru-based catalyst supported on an exfoliated LDO/carbon nanocomposite, Ru(3)/ESV-LDC, revealed the nearly complete HMF conversion (99.2%) at an FDCA selectivity of >98%. This was attributed to the synergistic effect derived from good RuO x dispersion, providing a high proportion of lattice oxygen for boosting surface oxygen mobility, and high basicity, in terms of both strength and number of basic sites. Moreover, Ru(3)/ESV-LDC exhibited good reusability without a significant loss of HMF conversion and FDCA yield, suggesting strong chemical robustness of RuO x species and a stable interaction between the active metal and support.

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Section: Resultssupporting

confidence: 92%

Section: ■ Introductionmentioning

confidence: 99%

Exfoliated Layered Metal Oxide-Supported Ruthenium Catalysts for Base-Free Oxidation of 5-Hydroxymethylfurfural into a Renewable Bioplastic Precursor

Thiensuwan,

Sankaranarayanan,

Yokoi

et al. 2023

ACS Sustainable Chem. Eng.

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“…The XRD pattern for organic LDHs suggests a d 003 of 2.80 nm for Ni/Cr(2/1)−1.0LA LDH, which is much higher than that of inorganic LDH (0.77 nm), as shown in Figure S1. These results indicate that the interlayer spacing of Ni/Cr LDH was increased due to the intercalation of laurate, which is similar to previous studies [28,29]. Ni/Cr(2/1)−1.0LA LDH showed an obvious signal at the characteristic peaks ((003) and (006)) of layered double hydroxide phases in the X−ray diffraction patterns [28,29], while the diffraction peak became weaker with the decreased dosage, as shown in Figure 1a.…”

Section: Elemental Analysis Of Ldhssupporting

confidence: 92%

“…These results indicate that the interlayer spacing of Ni/Cr LDH was increased due to the intercalation of laurate, which is similar to previous studies [28,29]. Ni/Cr(2/1)−1.0LA LDH showed an obvious signal at the characteristic peaks ((003) and (006)) of layered double hydroxide phases in the X−ray diffraction patterns [28,29], while the diffraction peak became weaker with the decreased dosage, as shown in Figure 1a. These results demonstrate that the crystal structures of Ni/Cr LA LDHs were more ordered when the laurate content increased.…”

Section: Elemental Analysis Of Ldhssupporting

confidence: 92%

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Intercalated-Laurate-Enhanced Photocatalytic Activities of Ni/Cr-Layered Double Hydroxides

et al. 2023

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Laurate (LA−)-intercalated nickel–chromium-layered double hydroxides (LDHs) were synthesized using the co-precipitation method and investigated as a potential photocatalyst for methylene orange (MO) degradation. For comparison, a series of LDHs with various molar ratios of Ni2+(or Mg2+)/Cr3+(or Fe3+)/LA−(or CO32−) were prepared. X−ray diffraction (XRD) and element analysis showed that Ni/Cr(2/1)−1.0 LA LDH had the most ordered crystal structure, and showed the same photocatalytic decolorization performance as Mg/Cr(2/1)−1.0LA LDH towards MO, which was significantly superior to Ni/Cr−CO3 LDH, Ni/Fe(2/1)−1.0LA LDH, and Ni/Cr−CO3 LDH with LA−, and Cr3+ with LA−. The photocatalytic removal rate of MO with the initial concentration of 100 mg/L by Ni/Cr(2/1)−1.0LA LDH (0.5 g/L) could be up to 80% with UV light irradiation for 3 h, which was almost twice higher than that of the sorption test. The photocatalytic reaction was in accordance with the pseudo-first-order kinetics, which implied that the catalytic process took place on the surface of the catalyst. All the results indicate the photodegradation of MO by Ni/Cr−LA LDHs was enhanced by the sorption of MO onto the intercalated LA− in the interlayer. The free radical capture experiments suggest that the main role of the photocatalytic mechanism of Ni/Cr−LA LDHs could be the •O2− with high oxidation activity produced by the electron-hole pairs of LDH, as excited by UV light. Additionally, the •O2− further reacted with the adjacent MO molecule pre-sorbed on the intercalated LA.

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Breakthrough Study of CO₂ Adsorption and Regeneration Performance of Mn‐ and Ce‐Doped Ni–Al Layered Double Hydroxides Derived Mixed Oxides in Packed‐Bed Column

Wagassa,

Zereffa,

Shifa

et al. 2024

Advanced Sustainable Systems

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Carbon dioxide (CO2) capture is an important strategy to mitigate greenhouse gas emissions and reduce global warming effects. This study synthesizes two nanomaterials, Ce‐doped Ni–Al mixed metal oxide (CNAO) and Mn‐doped Ni–Al mixed metal oxide (MNAO), from Mn‐ and Ce‐doped Ni–Al‐layered double hydroxides using a co‐precipitation method followed by a calcination process. The materials are characterized using various techniques, such as High‐resolution transmission electron microscopy‐energy dispersive x‐ray spectroscopy/selected area electron dispersion (HRTEM‐EDS/SAED), X‐ray diffraction (XRD), x‐ray photoelectron spectroscopy (XPS), Brunauer‐Emmett‐Teller (BET), and attenuated total reflection Fourier transform infrared (ATR FT‐IR). The CO2 adsorption performance of the materials is evaluated using packed‐bed column experiments at the testing conditions of 13 vol% ± 1 vol% CO2 in N2 simulated flue gas, flow rate of 20 mL min−1, inlet pressure of 14.15 ± 0.1 psi, and temperature of 31 °C ± 2 °C. The results show that both CNAO and MNAO are promising nanomaterials for CO2 capture applications due to their high CO2 adsorption capacity and efficiency. CNAO has a higher saturation capacity of 11.4 mmol g−1 and a longer breakthrough time than MNAO, which has a saturation capacity of 10.0 mmol g−1. The doping of Ce and Mn enhances the CO2 adsorption capacity of the materials compared to the un‐doped Ni–Al mixed oxide. The mechanisms of CO2 adsorption are mainly linearly adsorbed CO2, bidentate, and monodentate or bulk carbonate formation, as revealed by ATR FT‐IR analysis. The regeneration performance results suggest that CNAO is more stable than MNAO under multiple regeneration cycles and more promising material for large‐scale CO2 capture applications.

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Basic intensity regulation of layered double oxide for CO2 adsorption process at medium temperature in coal gasification

Cited by 8 publications

References 42 publications

Exfoliated Layered Metal Oxide-Supported Ruthenium Catalysts for Base-Free Oxidation of 5-Hydroxymethylfurfural into a Renewable Bioplastic Precursor

Exfoliated Layered Metal Oxide-Supported Ruthenium Catalysts for Base-Free Oxidation of 5-Hydroxymethylfurfural into a Renewable Bioplastic Precursor

Intercalated-Laurate-Enhanced Photocatalytic Activities of Ni/Cr-Layered Double Hydroxides

Breakthrough Study of CO₂ Adsorption and Regeneration Performance of Mn‐ and Ce‐Doped Ni–Al Layered Double Hydroxides Derived Mixed Oxides in Packed‐Bed Column

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Basic intensity regulation of layered double oxide for CO2 adsorption process at medium temperature in coal gasification

Cited by 8 publications

References 42 publications

Exfoliated Layered Metal Oxide-Supported Ruthenium Catalysts for Base-Free Oxidation of 5-Hydroxymethylfurfural into a Renewable Bioplastic Precursor

Exfoliated Layered Metal Oxide-Supported Ruthenium Catalysts for Base-Free Oxidation of 5-Hydroxymethylfurfural into a Renewable Bioplastic Precursor

Intercalated-Laurate-Enhanced Photocatalytic Activities of Ni/Cr-Layered Double Hydroxides

Breakthrough Study of CO2 Adsorption and Regeneration Performance of Mn‐ and Ce‐Doped Ni–Al Layered Double Hydroxides Derived Mixed Oxides in Packed‐Bed Column

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Breakthrough Study of CO₂ Adsorption and Regeneration Performance of Mn‐ and Ce‐Doped Ni–Al Layered Double Hydroxides Derived Mixed Oxides in Packed‐Bed Column