An investigation into mechanism of cation adsorption by reconstruction of calcined layered double hydroxide

Wu, Mengjie; Zhang, Jia; Peng, Yongqiang; Zhou, Jizhi; Ruan, Xiuxiu; Liu, Jianyong; Liu, Qiang; Frost, Ray L.; Qian, Guangren

doi:10.1016/j.micromeso.2017.01.032

Cited by 18 publications

(6 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…12,26−30 Recently, it has been reported that metal cations can be adsorbed into the LDH matrix through introducing calcined LDH in metal nitrate solutions. 28 Starting from flowerlike MgAl-LDHs, the flowerlike morphology is retained through the calcination and rehydration processes as a result of the "memory effect", where carefully calcined LDH (or LDO) is able to revert back to its pristine hydrotalcite-like form in aqueous media. More importantly, in this work, we have demonstrated that the flowerlike MgAl-LDHs can be doped with transition metals through cationic exchange if the LDOs are immersed into an aqueous solution containing singular and even multiple transition metal salts (e.g., metal nitrates).…”

Section: Introductionmentioning

confidence: 99%

“…In this research, a general strategy to synthesize flowerlike LDH materials containing catalytically important transition metals (e.g., Cu, Zn, Ni, and Co) is developed by utilizing the “memory effect” properties of LDH materials. Briefly, the “memory effect” refers to the ability of calcined LDHs or layered double oxides (LDOs) to revert into their original crystallographic structures and retain the nanosheet morphology upon reintroduction of water (i.e., rehydration) and anionic species. ,− Recently, it has been reported that metal cations can be adsorbed into the LDH matrix through introducing calcined LDH in metal nitrate solutions . Starting from flowerlike MgAl-LDHs, the flowerlike morphology is retained through the calcination and rehydration processes as a result of the “memory effect”, where carefully calcined LDH (or LDO) is able to revert back to its pristine hydrotalcite-like form in aqueous media.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of CuZn-Doped MgAl-Layered Double Hydroxide Catalysts through the Memory Effect of Hydrotalcite for Effective Hydrogenation of CO₂ to Methanol

Lim

Yeo

Zeng

2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

In this work, a synthesis procedure was developed to introduce transition metal ions into a MgAl-layered double hydroxide (MgAl-LDH, or hydrotalcite) by utilizing the unique "memory effect" property of calcined LDH. This technique allows our MgAl-LDH to retain its pristine flowerlike morphology, which prevents stacking of nanosheets and is fully accessible for reactants. Briefly, calcined MgAl-LDH (or MgAl-layered double oxide, MgAl-LDO) was submerged in dilute monometal or mixed transition metal nitrate solutions, allowing ion exchange of M 2+ cations and the rehydration of MgAl-LDO back into LDH through the memory effect. The product was centrifuged and dried, allowing pre-selected transition metals (e.g., Cu, Zn, Ni, and Co) to occupy some of the octahedral sites of the LDH phase in which Mg 2+ ions were previously located. A CuZn-doped MgAl-LDH was then carefully reduced under a hydrogen atmosphere, precipitating tiny Cu nanoparticles out of the reformed LDH nanosheets, and was subsequently used in a series of CO 2 hydrogenation experiments. The bifunctional material, which comprises a CO 2 -sorbent LDH support with active metal cocatalysts, has achieved high specific activity per copper loading and high methanol selectivity, while maintaining a stable performance with over 70% methanol selectivity over 40 h at 280 °C. The excellent performance of this catalyst is attributed to the easily accessible active sites (Cu 0 nanoparticles) located on the surface of nanostructured petals for the gaseous reactants. The performance was found to be remarkably better than that of a well-established commercial Cu-based catalyst for methanol synthesis. Future potential development could entail the functionalization of other transition metals for the utilization of CO 2 .

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of CuZn-Doped MgAl-Layered Double Hydroxide Catalysts through the Memory Effect of Hydrotalcite for Effective Hydrogenation of CO₂ to Methanol

Lim

Yeo

Zeng

2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…Second, the specific surface area increases, and porous structure can be obtained. The metal oxide domains produced during thermal treatment can be connected by the trivalent metals migrated to tetrahedral site [ 23 , 24 ], resulting in intra-particle mesopores [ 25 , 26 , 27 ]. It is generally known that LDHs prepared by conventional coprecipitation method tend to have specific surface area (S BET ) around 20–60 m 2 /g [ 28 , 29 , 30 ], while the corresponding LDO had S BET higher than 100 m 2 /g [ 27 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Mesopore Structure of Mixed Metal Oxide through Albumin-Templated Coprecipitation and Reconstruction of Layered Double Hydroxide

Jung

Kim

2021

Nanomaterials

View full text Add to dashboard Cite

Mixed metal oxide (MMO) with relatively homogeneous mesopores was successfully obtained by calcination and reconstruction of albumin-templated layered double hydroxide (LDH). The aggregation degree of albumin-template was controlled by adjusting two different synthesis routes, coprecipitation and reconstruction. X-ray diffraction patterns and scanning electron microscopic images indicated that crystal growth of LDH was fairly limited during albumin-templated coprecipitation due to the aggregation. On the hand, crystal growth along the lateral direction was facilitated in albumin-templated reconstruction due to the homogeneous distribution of proteins moiety. Different state of albumin during LDH synthesis influenced the local disorder and porous structure of calcination product, MMO. The N2 adsorption-desorption isotherms demonstrated that calcination on reconstructed LDH produced MMO with large specific surface area and narrow distribution of mesopores compared with calcination of coprecipitated LDH.

show abstract

“…Fortunately, the calcined HT can be reconstructed due to the memory effect of HT. During the process, some metal ions have the chance to be introduced into the layer of reconstructed HT [30,31]. The lattice-confined metal species can be converted into highly dispersed metal NPs and even single metal atom sites.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical PtIn/Mg(Al)O Derived from Reconstructed PtIn-hydrotalcite-like Compounds for Highly Efficient Propane Dehydrogenation

Zhang

Song

et al. 2019

Catalysts

View full text Add to dashboard Cite

The challenges facing propane dehydrogenation are to solve the Pt sintering and carbon deposition. This paper provides a new way to disperse and stabilize Pt species and resist carbon deposition. Highly dispersed Pt species were topologically transformed from reconstructed PtIn-hydrotalcite-like precursors in a flower-like hierarchical microstructure. The lattice confinement of reconstructed hydrotalcite-like precursor is in favor of stabilizing the highly dispersed Pt species, and the hierarchical microstructure is an important factor to prolong its lifetime by enhancing tolerance to carbon deposition. In propane dehydrogenation, the propene selectivity decreases in the sequences of catalyst in flower-like > single-plate > block mass with small, flakeys. A propene selectivity of >97% with a conversion of 48% at 600 °C has been achieved over a flower-like PtIn/Mg(Al)O catalyst. Additionally, no visible Pt sintering can even be observed on this catalyst after a reaction time of 190 h. This strategy provides an effective and feasible alternative for the facile preparation of highly dispersed metal catalysts.

show abstract

An investigation into mechanism of cation adsorption by reconstruction of calcined layered double hydroxide

Cited by 18 publications

References 28 publications

Preparation of CuZn-Doped MgAl-Layered Double Hydroxide Catalysts through the Memory Effect of Hydrotalcite for Effective Hydrogenation of CO₂ to Methanol

Preparation of CuZn-Doped MgAl-Layered Double Hydroxide Catalysts through the Memory Effect of Hydrotalcite for Effective Hydrogenation of CO₂ to Methanol

Development of Mesopore Structure of Mixed Metal Oxide through Albumin-Templated Coprecipitation and Reconstruction of Layered Double Hydroxide

Hierarchical PtIn/Mg(Al)O Derived from Reconstructed PtIn-hydrotalcite-like Compounds for Highly Efficient Propane Dehydrogenation

Contact Info

Product

Resources

About

An investigation into mechanism of cation adsorption by reconstruction of calcined layered double hydroxide

Cited by 18 publications

References 28 publications

Preparation of CuZn-Doped MgAl-Layered Double Hydroxide Catalysts through the Memory Effect of Hydrotalcite for Effective Hydrogenation of CO2 to Methanol

Preparation of CuZn-Doped MgAl-Layered Double Hydroxide Catalysts through the Memory Effect of Hydrotalcite for Effective Hydrogenation of CO2 to Methanol

Development of Mesopore Structure of Mixed Metal Oxide through Albumin-Templated Coprecipitation and Reconstruction of Layered Double Hydroxide

Hierarchical PtIn/Mg(Al)O Derived from Reconstructed PtIn-hydrotalcite-like Compounds for Highly Efficient Propane Dehydrogenation

Contact Info

Product

Resources

About

Preparation of CuZn-Doped MgAl-Layered Double Hydroxide Catalysts through the Memory Effect of Hydrotalcite for Effective Hydrogenation of CO₂ to Methanol

Preparation of CuZn-Doped MgAl-Layered Double Hydroxide Catalysts through the Memory Effect of Hydrotalcite for Effective Hydrogenation of CO₂ to Methanol