Synthesis of zeolites P and evaluation of their activity as new and reusable heterogeneous catalysts in a three-component ABB’ Povarov model reaction

Abstract

A Na-P zeolite was synthesized and subjected to ion exchange with Ca2+, Cu2+, Al3+, and In3+, and supported with H+/NH4Cl (NH4-P) by in situ reaction of EtOH and NH4Cl. All the exchanged zeolites showed catalytic activity in the ABB’ Povarov reaction. However, zeolite NH4-P promoted a better yield. In all reactions two products were obtained, 2,6-dimethyl-4-(2-oxopyrrolidin-1-yl)-1,2,3,4-tetrahydroquinoline and 1-(1-(4-methylphenylamino)ethyl)pyrrolidin 2-one. Synthesis using zeolite P as catalyst proves to be a simple method with high yields, short reaction times and easy preparation. The catalyst can be recovered by filtration and reused up to three times in good yields.

Unveiling the Catalytic Role of Zeolite P1 in Carbonylation Reaction

“…As shown in Figure a, the XRD patterns of P1-1.0Al exhibited crystalline structures, characterized by exclusive P1 diffraction peaks at 2θ = 12.45°, 17.65°, 21.66°, 28.07°, and 33.36° (PDF:00-039-0219). This was observed when the aluminum content was reduced, resulting in a SiO 2 /Al 2 O 3 molar ratio exceeding 10/1.0 (Figure S1, P1-0.9Al and P1-0.8Al).…”

Uso de desechos de yuca (Manihot esculenta Crantz) en la remoción de verde y naranja de metilo

“…Los resultados obtenidos son superiores para biochar derivado de otras biomasas de yuca como su corteza y película suberosa, y en cuanto a la capacidad de absorción, se ha reportado alrededor de 78 mg/g para verde de malaquita (Leng et al, 2015), de 80 mg/g para contaminantes orgánicos y de alrededor de 90 mg/g para la remoción de metales con alto nivel de toxicidad ambiental (Oladipo y Ifebajo, 2018; Fan et al, 2017;Li et al, 2018). Los materiales con estas propiedades de adsorción son comparables a los aluminosilicatos, que pueden contener contaminantes orgánicos e inorgánicos, lo cual amplía su uso en reacciones catalíticas, buscando procesos ambientalmente aplicables que cumplan los principios de la química verde (Lyu, Zhang y Shen, 2020;López et al, 2020).…”