Synthesis, Optimization and Characterization of Zeolite Beta (BEA): Production of ZSM-5 and NaAlSiO4 as Secondary Phases

Abstract

. Em outros ensaios, foram obtidas fases secundárias de NaAlSiO 4 e SiO 2 , bem como zeólita ZSM-5, analcima, omega e Linde B2.Palavras-chave: BEA; razão Si/Al; Tempo; Temperatura. AbstractThe choice of synthesis parameters influences obtainment of a suitable material for use in several applications. In this paper, zeolite beta (BEA) was successfully obtained by hydrothermal synthesis, assessing the following parameters: Si/Al ratio, time and crystallization temperature. The synthesized materials were characterized by X-ray diffraction (XRD), Fourier-Transfer Infrared (FTIR) spectroscopy, thermogravimetry (TG and DTG) and N 2 adsorption-desorption isotherm analyses. Xray diffraction showed that the change of only one of these parameters acts on the formation of the desired microporous structure. BEA was obtained in the Si/Al ratio equal 8, with a crystallization time of 4 days at 170 °C, presenting a specific area of 437 m . In other assays, secondary phases of NaAlSiO 4 and SiO 2 were obtained, as well as ZSM-5 zeolite, analcime, omega and linde B2.

Synthesis of Zeolite Beta Using Seawater Instead of Deionized Water

“…Figure 2 shows TG and DTA results of sample HB08, synthesized from a gel having a Si/Al molar ratio of 50, under nitrogen flow. The TGA profile for this sample has the same characteristics as the aluminosilicate Beta zeolite (Si/Al = 8) obtained by Nascimento et al [19]. The total weight loss is approximately 12.5%, between ambient temperature and 800 ° C. The loss of mass, about 2%, observed up to 200 ° C can be attributed to the elimination of water.…”

“…The second mass loss of about 10.5% occurs between 200 and 500 ° C. This step corresponds to the desorption of the organic structure agent (TEAOH) which is present in the porosity of the zeolite. This weight loss is accompanied by a broad endothermic signal located at about 440°C [2,19]. As seen from table 3, the crystallinity degree is high and varried from 85% to 100%, and the optimal percentage was obtained from the synthesis realized from gel with a Si/Al molar ratio of 50.…”

In situ DRIFT studies on N2O formation over Cu-functionalized zeolites during ammonia-SCR

“…S2†) provide the diffraction patterns for the parent zeolite samples which are characteristic for H-SSZ-13, H-ZSM-5, and H-BEA (JCPDS no. ; 52-0784, 28 89-1421 29 and 48-0038, 30 respectively) samples. Furthermore, the diffractograms show that the structure of the samples is maintained after functionalization with copper and there is no distinct intensity increase or broadening of the diffraction peaks upon adding Cu to the parent zeolites (H-type).…”

Fast Removal of Tetracycline from Aqueous Solution by Aluminosilicate Zeolite Nanoparticles with High Adsorption Capacity

“…After the annealing process, the aluminosilicate diffraction pattern shows peaks at 7.6 and 22.5°, which belong to the typical structure of zeolite β. They correspond to the (101) and (302) crystal planes. , Therefore, the XRD confirms that after annealing at 250 °C for 24 h, the amorphous aluminosilicate has crystallized into aluminosilicate zeolite β.…”