Structure–activity relationships of LDH catalysts for the glucose-to-fructose isomerisation in ethanol

Abstract

Glucose-to-fructose isomerization is the key process in the reaction sequence that can lead to the total conversion of biomass into valuable fine chemicals. However, it is challenging to find an...

Synthesis of zeolitic imidazolate framework-8 using an electric field in a gelled medium

“…In this case, the reflection {0 0 4} of hydrocalumite doubled due to slight variations in the hydration of the different double hydroxide layers. 35…”

Isomorphic Insertion of Ce(III)/Ce(IV) Centers into Layered Double Hydroxide as a Heterogeneous Multifunctional Catalyst for Efficient Meerwein–Ponndorf–Verley Reduction

“…Furthermore, LDH has constant positive surface charge (∼+30 to 40 mV), which is highly independent from the guest cations cosubstituted in a small extent. 32,37 It is noteworthy that many studies have attempted to synthesize Ce-containing LDH. 38,39 However, to the best of our knowledge, it has not been possible to produce a phase-pure LDH structure when more than 1% cerium compared to the aluminum centers is used.…”

“…LDH is built on brucite (Mg­(OH) 2 )-like hydroxyl layers in which part of the Mg­(II) centers are isomorphic substituted by trivalent cations [ e.g ., Al­(III), Ga­(III), Fe­(III), and Ce­(III)]. , Due to this substitution, the hydroxyl layers have positive charges, which are balanced by the interlamellar anions ( e.g ., OH – , CO 3 2– etc. ). − With the cosubstitution of cerium cations in this structure [in addition to aluminum­(III) centers], the stabilization of the Ce­(III) oxidation state is expected to be similar to other valence-variable cations, , and the adequate isolation of the active sites associated with the required hydroxyl groups is possible based on the even cation distribution model. Furthermore, LDH has constant positive surface charge (∼+30 to 40 mV), which is highly independent from the guest cations cosubstituted in a small extent. , It is noteworthy that many studies have attempted to synthesize Ce-containing LDH. , However, to the best of our knowledge, it has not been possible to produce a phase-pure LDH structure when more than 1% cerium compared to the aluminum centers is used.…”

“…). − With the cosubstitution of cerium cations in this structure [in addition to aluminum­(III) centers], the stabilization of the Ce­(III) oxidation state is expected to be similar to other valence-variable cations, , and the adequate isolation of the active sites associated with the required hydroxyl groups is possible based on the even cation distribution model. Furthermore, LDH has constant positive surface charge (∼+30 to 40 mV), which is highly independent from the guest cations cosubstituted in a small extent. , It is noteworthy that many studies have attempted to synthesize Ce-containing LDH. , However, to the best of our knowledge, it has not been possible to produce a phase-pure LDH structure when more than 1% cerium compared to the aluminum centers is used. This must be related to the relatively high ionic radius of cerium compared to Mg/Al cations, which makes substitution less favorable .…”

MgAl-LDH nanoflowers as a novel sensing material for high-performance humidity sensing

“… 5,6 Owing to their unique composition and ion-exchange properties, LDHs are extensively utilized in various fields such as catalysis, drug delivery, wastewater treatment, and adsorption, demonstrating their versatility and applicability across diverse applications. 7–10 LDHs can be synthesized using diverse techniques such as co-precipitation, hydrothermal synthesis, and ion exchange. Their functionality can be tailored by adjusting the layered composition, interlayer anions, and conditions of synthesis, offering a high degree of versatility and customization.…”