The structure-directed effect of Al-based metal–organic frameworks on fabrication of alumina by thermal treatment

Liu, Dandan; Dai, Fang; Tang, Zhe; Liu, Yunqi; Liu, Chenguang

doi:10.1016/j.materresbull.2015.02.011

Cited by 17 publications

(12 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak at 1505-1510 cm −1 was assigned to the vibration of the benzene ring. The above results indicated the coordination between COO − of BDC and metal ions in MOF structure, and they were consistent with literatures [19,20]. Moreover, in Mg-MOF ( Figure 2b), the peak at 562 cm −1 can be assigned to Mg-O bond was observed.…”

Section: Character Of Mof With Different Ca/mg Ratiossupporting

confidence: 91%

Multi-Metals CaMgAl Metal-Organic Framework as CaO-based Sorbent to Achieve Highly CO2 Capture Capacity and Cyclic Performance

Chang

Lin

et al. 2020

Materials

View full text Add to dashboard Cite

In this study, Ca-based multi-metals metal-organic framework (CaMgAl-MOF) has been designed as precursor material for carbon dioxide (CO2) capture to enhance the CO2 capture capacity and stability during multiple carbonation-calcination cycles. The CaMgAl-MOFs were constructed from self-assembly of metal ions and organic ligands through hydrothermal process to make metal ions uniformly distributed through the whole structure. Upon heat treatment at 600 °C, the Ca-based multi-metals CaMgAl-MOF would gradually transform to CaO and MgO nanoparticles along with the amorphous aluminum oxide distributed in the CaO matrix. XRD, Fourier transform infrared (FTIR), and SEM were used to identify the structure and characterize the morphology. The CO2 capture capacity and multiple carbonation-calcination cyclic tests of calcined Ca-based metal-organic framework (MOF) (attached with O and indicated as Ca-MOF-O) were performed by thermal gravimetric analysis (TGA). The single metal component calcined Ca-MOF sorbent have the highest CO2 capture capacity up to 72 wt.%, but a lower stability of 61% due to severe particle aggregation. In contrast, a higher Ca-rich MOF oxide sorbent with tailoring the Mg/Al ratios, Ca0.97Mg0.025Al0.005-MOF-O, showed the best performance, not only having the high stability of ~97%, but also maintaining the highest capacity of 71 wt.%. The concept of using Ca-based MOF materials combined with mixed-metal ions for CO2 capture showed a potential route for achieving efficient multiple carbonation-calcination CO2 cycles.

show abstract

Section: Character Of Mof With Different Ca/mg Ratiossupporting

confidence: 91%

Multi-Metals CaMgAl Metal-Organic Framework as CaO-based Sorbent to Achieve Highly CO2 Capture Capacity and Cyclic Performance

Chang

Lin

et al. 2020

Materials

View full text Add to dashboard Cite

show abstract

“…The type of isotherm and hysteresis loop agrees well with the TEM observations and the spongy-like structure with uniform slit-like pores in Al 2 O 3 -Spongy. The BET surface area of Al 2 O 3 -Spongy is 350 m 2 g −1 , and the pore volume is 0.63 cm 3 g − 1 , both higher than reported alumina materials synthesized by boehmite precursor and other Al-MOFs [ 18 , 19 , 20 , 25 , 26 ]. The N 2 sorption isotherms of Al 2 O 3 -PB are also Type IV ( Figure 3 a), suggesting the mesoporous structure of this alumina.…”

Section: Resultsmentioning

confidence: 75%

“…The study of Al-MOFs as a precursor to fabricate γ-Al 2 O 3 has not aroused much attention. Based on our previous study, aluminium clusters in Al-MOFs could direct the microstructure and morphology of the obtained alumina [ 18 , 19 , 20 ]. Therefore, using Al-MOFs as precursor is a route that may expand the versatility of alumina.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Mesoporous γ-Al2O3 with Spongy Structure: In-Situ Conversion of Metal-Organic Frameworks and Improved Performance as Catalyst Support in Hydrodesulfurization

et al. 2018

Self Cite

View full text Add to dashboard Cite

Over the past decades, extensive efforts have been devoted to modulating the textural properties, morphology and microstructure of γ-Al2O3, since the physiochemical properties of γ-Al2O3 have close correlations with the performance of hydrotreating catalysts. In this work, a spongy mesoporous γ-alumina (γ-Al2O3) was synthesized using Al-based metal-organic frameworks (Al-MOFs) as precursor by two-step pyrolysis, and this Al-MOF-derived γ-Al2O3 was used as hydrodesulfurization (HDS) catalyst support, to explore the effect of support on the HDS performance. Compared with industrial γ-Al2O3, the spongy alumina displayed well-developed porosity with relatively high surface area, large pore volume, and abundant weak Lewis acid sites. Based on catalyst characterization and performance evaluation, sulfurized molybdenum and cobalt molecules were able to incorporate and highly disperse into channels of the spongy mesoporous alumina, increasing the dispersion of active catalytic species. The spongy γ-Al2O3 was also able to enhance the diffusion efficiency and mass transfer of reactant molecules due to its improved texture properties. Therefore, the corresponding catalyst presented higher activities toward HDS of dibenzothiophene (DBT) than that from industrial alumina. The spongy mesoporous γ-alumina synthesized by Al-MOFs provides a new alternative to further develop novel γ-alumina materials with different texture and various nanoporous structures, considering the diversity of MOFs with different compositions, topological structures, and morphology.

show abstract

“…Kelchtermans et al [26] describe. Beneath these positions, Al 3+ ions can be pentahedral coordinated [23,27], whereas this coordination generally can not be dedicated as a convenient position in the lattice of the ZnO but is known from 27 Al-NMR investigations of different aluminium oxide structures and were often found at the surface of the solids bound to different organic molecules [29,30,31]. Avadhut et al [25] performed multinuclear ( 1 H, 13 C, 27 Al) spectroscopic analysis with the aim to localize the different Al species in AZO.…”

Section: Incorporation Of Aluminum In Zno and Electrical Properties Omentioning

confidence: 99%

Polyol synthesized aluminum doped zinc oxide nanoparticles - influence of the hydration ratio on crystal growth, dopant incorporation and electrical properties

Straube

Linders

Mayer‐Gall

et al. 2017

Materials Today: Proceedings

View full text Add to dashboard Cite

The wet chemical deposition of solution processed transparent conducting oxides (TCO) provides an alternative low cost and economical deposition technique to realize large-areas of conducting films. Since the price for the most common TCO Indium Tin Oxide rises enormously, Aluminum Zinc Oxide (AZO) as alternative TCO reaches more and more interest. The optoelectronical properties of nanoparticle coatings strongly depend beneath the porosity of the coating on the shape and size of the used particles. By using bigger or rod-shaped particles it is possible to minimize the amount of grain boundaries resulting in an improvement of the electrical properties, whereas particles bigger than 100 nm should not be used if highly transparent coatings are necessary as these big particles scatter the visible light and lower the transmittance of the coatings. In this work we present a simple method to synthesize AZO particles with different shape and size, but comparable electronical properties. We use a simple, well reproducible polyol method for synthesis and influence the shape and size of the particles by adding different amounts of water to the precursor solution. We can show that the addition of aluminum as dopant strongly hinders the crystal growth but the addition of water counteracts this, so that both, spherical and rod-shaped particles can be obtained.

show abstract

The structure-directed effect of Al-based metal–organic frameworks on fabrication of alumina by thermal treatment

Cited by 17 publications

References 41 publications

Multi-Metals CaMgAl Metal-Organic Framework as CaO-based Sorbent to Achieve Highly CO2 Capture Capacity and Cyclic Performance

Multi-Metals CaMgAl Metal-Organic Framework as CaO-based Sorbent to Achieve Highly CO2 Capture Capacity and Cyclic Performance

Synthesis of Mesoporous γ-Al2O3 with Spongy Structure: In-Situ Conversion of Metal-Organic Frameworks and Improved Performance as Catalyst Support in Hydrodesulfurization

Polyol synthesized aluminum doped zinc oxide nanoparticles - influence of the hydration ratio on crystal growth, dopant incorporation and electrical properties

Contact Info

Product

Resources

About