Core‐Shell Faujasite@Aqueous Miscible Organic‐Layered Double Hydroxides Composites with Tunable Acid/Base Properties for One‐Pot Synthesis of Ethyl trans‐α‐Cyanocinnamate

Abstract

Bifunctional acid‐base catalysts have been developed by fabricating core‐shell faujasite@aqueous miscible organic‐layered double hydroxides (FAU@AMO‐LDHs) composites via the growth of AMO‐LDHs on zeolite surfaces. Interestingly, by adjusting the acid/base properties of the composites, the one‐pot synthesis of ethyl trans‐α‐cyanocinnamate via deacetalization‐Knoevenagel reaction can be achieved up to 90% yield. In contrast, almost no desired products can be observed in cases of isolated zeolites and AMO‐LDHs, demonstrating the synergistic effect of zeolites and AMO‐LDHs as acid‐base catalysts. These findings open up new perspectives of the development of tunable acid‐base zeolite@LDHs composites in an acid‐base tandem reaction, which can selectively produce ethyl trans‐α‐cyanocinnamate up to 90% yield.

Nanocrystalline BEA-CNT Composites with High Metal Dispersion Obtained via Inter-Zeolite Transformation for Antibacterial Application

“…The design of hybrid materials combined between two different ingredients is of a crucial importance in chemical communities , because they have been applied in various applications ranging from wastewater treatment, to gas purification, and biomedical devices. − Recently, several hybrid materials have been successfully fabricated, in particular, composites containing aluminosilicate materials as main components. − Recently, core–shell zeolite@aqueous miscible organic-layered double hydroxide (AMO-LDH) and zeolite@metal–organic framework composites have been successfully fabricated and utilized as catalysts for various applications such as the highly efficient one-pot tandem synthesis of ethyl trans-α-cyanocinnamate and methane conversion to methanol, respectively. , In addition, carbon nanotube (CNT)-zeolite composites have been employed efficiently in the adsorption of organic compounds according to their integrating aspects between the hydrophobic surface modification of carbon nanotubes (CNTs) decorated on zeolites and the high porosity of microporous zeolite structures …”

“…6−8 Recently, core−shell zeolite@aqueous miscible organic-layered double hydroxide (AMO-LDH) and zeolite@metal−organic framework composites have been successfully fabricated and utilized as catalysts for various applications such as the highly efficient one-pot tandem synthesis of ethyl trans-α-cyanocinnamate and methane conversion to methanol, respectively. 9,10 In addition, carbon nanotube (CNT)-zeolite composites have been employed efficiently in the adsorption of organic compounds according to their integrating aspects between the hydrophobic surface modification of carbon nanotubes (CNTs) decorated on zeolites and the high porosity of microporous zeolite structures. 11 Apart from catalysis and adsorption perspectives, the antibacterial application using silver (Ag) nanoparticles decorated on aluminosilicates and carbon-based materials is one of the most promising research topics.…”

Carbon Nanotubes Deposited on Mordenite Zeolite/NiAl-Layered Double Hydroxide Composites as Electrocatalysts for 2,5-Furandicarboxylic Acid Production from 5-Hydroxymethylfurfural

“…Metals loaded on zeolites are utilized as highly efficient catalysts for the synthesis of CNTs because zeolites have well-defined porous structures and high surface areas providing the highly dispersed metal active sites, resulting in high yields of CNTs and narrow distributed tube diameters. , Recently, layered double hydroxide (LDHs)/zeolite composites synthesized via an aqueous miscible organic solvent treatment (AMOST) process have been illustrated as an efficient method to produce highly dispersed metal nanoparticles on zeolite surfaces. − Generally, LDHs are layered clay minerals consisting of positively charged layers and interlayer anions. They are generally represented by the chemical formula [M 2+ 1– x M 3+ x (OH) 2 ]­[A n – ] x / n · z H 2 O, where M 2+ and M 3+ are divalent cations (e.g., Mg 2+ or Ni 2+ ) and trivalent cations (e.g., Al 3+ , Fe 3+ , or Cr 3+ ), respectively, A n – is an interlayer anion (e.g., CO 3 2– or Cl – ), and z is the amount of water .…”

Insight into the In-Situ Encapsulation-Reassembly Strategy To Fabricate PW12@NiCo-LDH Acid–Base Bifunctional Catalysts

“…To this end, numerous acid−base bifunctional catalysts with core-shell, yolk-shell, or spatially orthogonal structures were designed during the decades, in which acid sites and base sites co-existed by unique organo-functionalization or located on the mutually independent region. These acid−base bifunctional catalysts mostly consisted of Pickering emulsions, 4 metal−organic frameworks, 5 covalent organic frameworks, 6 porous organic polymers, 7 mesoporous silicas, 8 zeolites 9 and layered double hydroxides (LDHs)-based composites, 10 etc. However, the complicated synthesis for fabrication of bifunctional catalysts led to an increasing energy consumption.…”