Fine-crystallized LDHs prepared with SiO2 spheres as highly active solid base catalysts

2017 ◽  
Vol 5 (15) ◽  
pp. 6947-6957 ◽  
Author(s):  
Mahiro Shirotori ◽  
Shun Nishimura ◽  
Kohki Ebitani
Keyword(s):  
Layered Double Hydroxides ◽  
Base Catalysis ◽  
Precipitation Method ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Highly Active ◽  
Co Precipitation ◽  
Double Hydroxides ◽  
Sio2 Spheres

Fine-crystallized layered double hydroxides are prepared via the co-precipitation method with the coexistence of SiO2 spheres (SiO2@LDH), and their base catalysis and structural properties are investigated.

scholarly journals Solid base catalysts derived from Ca–Al–X (X = F−, Cl− and Br−) layered double hydroxides for methanolysis of propylene carbonate

RSC Advances ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 785-791 ◽  
Author(s):  
Yunhui Liao ◽  
Feng Li ◽  
Yanfeng Pu ◽  
Feng Wang ◽  
Xin Dai ◽  
...  
Keyword(s):  
Propylene Carbonate ◽  
Layered Double Hydroxides ◽  
Dimethyl Carbonate ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Highly Active ◽  
Double Hydroxides

The CA-F− catalyst modified with Al3+ and F− was highly active and recyclable for dimethyl carbonate synthesis.

Dimethyl carbonate synthesis over solid base catalysts derived from Ca–Al layered double hydroxides

2018 ◽  
Vol 72 (8) ◽  
pp. 1963-1971 ◽  
Author(s):  
Yunhui Liao ◽  
Feng Li ◽  
Xin Dai ◽  
Ning Zhao ◽  
Fukui Xiao
Keyword(s):  
Layered Double Hydroxides ◽  
Dimethyl Carbonate ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Double Hydroxides

Synthesis of 3-hydroxybutyraldehyde over highly stable solid base catalysts prepared from layered double hydroxides

2021 ◽  
Vol 214 ◽  
pp. 106277
Author(s):  
Yuanyuan Jiang ◽  
Haolan Liu ◽  
Huaiyuan Zhao ◽  
Ruru Zhou ◽  
Weichen Du ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Double Hydroxides

scholarly journals Mixed Oxide Layered Double Hydroxide Materials: Synthesis, Characterization and Efficient Application for Mn2+ Removal from Synthetic Wastewater

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4089
Author(s):  
Cristina Modrogan ◽  
Simona Cǎprǎrescu ◽  
Annette Madelene Dǎncilǎ ◽  
Oanamari Daniela Orbuleț ◽  
Eugeniu Vasile ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Layered Double Hydroxides ◽  
Synthetic Wastewater ◽  
Precipitation Method ◽  
Metallic Ions ◽  
Materials Synthesis ◽  
Experimental Conditions ◽  
Edx Analysis ◽  
Co Precipitation ◽  
Double Hydroxides

Magnesium–aluminum (Mg-Al) and magnesium–aluminum–nickel (Mg-Al-Ni) layered double hydroxides (LDHs) were synthesized by the co-precipitation method. The adsorption process of Mn2+ from synthetic wastewater was investigated. Formation of the layered double hydroxides and adsorption of Mn2+ on both Mg-Al and Mg-Ni-Al LDHs were observed by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometry (EDX) analysis. XRD patterns for prepared LDHs presented sharp and symmetrical peaks. SEM studies revealed that Mg-Al LDH and Mg-Al-Ni LDH exhibit a non-porous structure. EDX analysis showed that the prepared LDHs present uniformly spread elements. The adsorption equilibrium on these LDHs was investigated at different experimental conditions such as: Shaking time, initial Mn2+ concentration, and temperatures (10 and 20 °C). The parameters were controlled and optimized to remove the Mn2+ from synthetic wastewater. Adsorption isotherms of Mn2+ were fitted by Langmuir and Freundlich models. The obtained results indicated that the isotherm data fitted better into the Freundlich model than the Langmuir model. Adsorption capacity of Mn2+ gradually increased with temperature. The Langmuir constant (KL) value of Mg-Al LDH (0.9529 ± 0.007 L/mg) was higher than Mg-Al-Ni LDH (0.1819 ± 0.004 L/mg), at 20 °C. The final adsorption capacity was higher for Mg-Al LDH (91.85 ± 0.087%) in comparison with Mg-Al-Ni LDH (35.97 ± 0.093%), at 20 °C. It was found that the adsorption kinetics is best described by the pseudo-second-order model. The results indicated that LDHs can be considered as a potential material for adsorption of other metallic ions from wastewater.

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