Natrolite zeolite: A natural and reusable catalyst for one-pot synthesis of α-aminophosphonates under solvent-free conditions

Bahari, Siavash; Sajadi, S. Mohammad

doi:10.1016/j.arabjc.2012.11.011

Cited by 10 publications

(5 citation statements)

References 26 publications

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“…Bahari and coauthors reported on a novel high yielding procedure for synthesizing α-aminophosphonates [42]. The one-pot reaction uses aromatic aldehydes or ketones, substituted anilines, and trialkyl phosphites under solvent-free conditions and Natrolite zeolite as catalyst.…”

Section: Synthesis Of α-Aminophosphonates By Using Natural Natrolite mentioning

confidence: 99%

Zeolites as Acid/Basic Solid Catalysts: Recent Synthetic Developments

2019

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The zeolites are porous solid structures characterized by a particular framework of aluminosilicates, in which the incorporation of the Al+3 ions generates an excess of negative charge compensated by cations (usually alkali or alkali earth) or protons. In the latter case, they are employed as catalysts for a wide variety of reactions, such as dehydration, skeletal isomerization and cracking, while the catalytic activity of basic zeolites has not found, up to now, any industrial or whatever relevant application in chemical processes. In the present review, we firstly intend to give an overview of the fundamental chemical composition, as well as the structural features of the zeolite framework. The purpose of this paper is to analyze their key properties as acid, both Lewis and Brønsted, and basic solid support. Their application as catalysts is discussed by reviewing the already published works in that field, and a final remark of their still unexplored potential as green, mild, and selective catalyst is also reported.

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Section: Synthesis Of α-Aminophosphonates By Using Natural Natrolite mentioning

confidence: 99%

Zeolites as Acid/Basic Solid Catalysts: Recent Synthetic Developments

2019

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“…It can expand, accommodating superhydrated structures, and undergo substantial contraction during dehydration [26], [45]. Natrolite is characterized as a small-pore zeolite with a needle-like crystal pattern [46], [48] and fibrous structure [30], [47] possessing a total pore volume of 22%. It comprises open octagonal cavities, isolated voids [16], [42], [43], and helical channels with an elliptical cross-section [44], facilitating the diffusion of water within its structure [17], [18], [19] and thus contributing to the swelling.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

Mitigation Measures of Swelling Characteristics in Alkali-Contaminated Red Earth using Fly Ash and GGBS Blends

Kumar Darapu,

Vindula

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Alkali contamination induces swelling in the inherently non-swelling soils, resulting in heave severely damaging the sub and superstructures. Stabilization measures must be taken in vulnerable areas to prevent such colossal losses. Considerable research has been conducted regarding the swelling behavior of soils contaminated with alkalis and the impact of subsequent stabilization techniques utilizing different industrial byproducts and pozzolanic materials. However, there is a paucity of such studies on the Red Earth (RE) of the Visakhapatnam region. Furthermore, limited attention was given to the effects of extremely low concentrations of alkalis on the swelling behavior of soils. RE in the study area of the Visakhapatnam region predominantly consists of quartz, kaolinite, and hematite. In phase 1 of the experimental analysis, RE was contaminated with a highly dilute NaOH solution (0.05 N), and the resulting swell characteristics were investigated. A free swell of 10% was observed. One-dimensional standard oedometer tests revealed an equilibrium swelling of 5.6%, indicating significant potential for substantial heave and subsequent damage. X-ray diffraction (XRD) analysis revealed the formation of natrolite and analcime zeolites with a hollow structure, which caused the swell. Peaks of silicate minerals like paragonite and ussingite were also observed, indicating the dissolution of authigenic minerals and new precipitations even at lower concentrations of NaOH. In phase 2, swell tests were conducted on a mixture of contaminated red earth (50% w/w), fly ash (25% w/w), and ground granulated blast furnace slag (GGBS, 25% w/w), and it was observed that the swelling was completely arrested. XRD analysis unveiled that even though siliceous zeolites were formed, the development of chrysotile, attapulgite, tobermorite, and dicalcium silicate effectively inhibited the swelling with their pozzolanic behavior.

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“…All the products are known compounds and the spectral data and melting points were identical to those reported in the literature. 21,23,[26][27][28][29][30] Dimethyl (phenyl)-N-(phenyl)aminomethylphosphonate ( Table 2,…”

Section: Preparation Of αAminophosphonatesmentioning

confidence: 99%

Magnetic ZnO@CuO@Iron ore nanocomposites as a green and highly efficient heterogeneous nanocatalyst for solventless synthesis of α-aminophosphonates

Sajadi

2019

Journal of Chemical Research

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A green novel synthesis of ZnO@CuO@Iron ore nanocomposites as a novel and magnetic heterogeneous nanocatalyst is used for the one-pot synthesis of α-aminophosphonates under solventless conditions. This study benefits from the magnetic iron ore acting as a multi-mineral Lewis acid system, the green properties and the large surface area due to its nanostructure. Moreover, scanning electron microscope analysis confirmed that the nanocatalyst gave an excellent yield and good recyclability; which, even after the 10th cycle of the model reaction retained its potential with no significant loss of catalytic activity.

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Natrolite zeolite: A natural and reusable catalyst for one-pot synthesis of α-aminophosphonates under solvent-free conditions

Cited by 10 publications

References 26 publications

Zeolites as Acid/Basic Solid Catalysts: Recent Synthetic Developments

Zeolites as Acid/Basic Solid Catalysts: Recent Synthetic Developments

Mitigation Measures of Swelling Characteristics in Alkali-Contaminated Red Earth using Fly Ash and GGBS Blends

Magnetic ZnO@CuO@Iron ore nanocomposites as a green and highly efficient heterogeneous nanocatalyst for solventless synthesis of α-aminophosphonates

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