Synthesis and characterization of mordenite zeolite from metakaolin and rice husk ash as a source of aluminium and silicon

Klunk, Marcos Antônio; Schröpfer, Suellen Brasil; Dasgupta, Sudipta; Das, Mohuli; Caetano, Nattan Roberto; Impiombato, Andrea Natale; Wander, Paulo Roberto; Moraes, Carlos Alberto Mendes

doi:10.1007/s11696-020-01095-4

Cited by 26 publications

(19 citation statements)

References 61 publications

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“…A microporous volume of 0.20 cm 3 g −1 was calculated in the case of (0.033 S 0 130/7 ) respectively, which is the expected microporous volume for a well-crystallized MOR-type zeolite [ 44 ]. The addition of CTAB to the synthesis gel does not affect the microporous volume of samples 0.033 S 0.01 130/7 , 0.033 S 0.02 130/7 , and 0.033 S 0.04 130/7 which exhibit the same order of microporous volume (0.18–0.21 cm 3 /g) as the sample 0.033 S 0 130/7 synthesized in the absence of CTAB, indicating that the creation of mesopores does not occur at the expense of micropores.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties

et al. 2021

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Hierarchical MOR-type zeolites were synthesized in the presence of hexadecyltrimethylammonium bromide (CTAB) as a porogen agent. XRD proved that the concentration of CTAB in the synthesis medium plays an essential role in forming pure hierarchical MOR-type material. Above a CTAB concentration of 0.04 mol·L−1, amorphous materials are observed. These hierarchical mordenite possess a higher porous volume compared to its counterpart conventional micrometer crystals. Nitrogen sorption showed the presence of mesoporosity for all mordenite samples synthesized in the presence of CTAB. The creation of mesopores due to the presence of CTAB in the synthesis medium does not occur at the expense of zeolite micropores. In addition, mesoporous volume and BET surface seem to increase upon the increase of CTAB concentration in the synthesis medium. The Si/Al ratio of the zeolite framework can be increased from 5.5 to 9.1 by halving the aluminum content present in the synthesis gel. These synthesized hierarchical MOR-type zeolites possess an improved catalytic activity for n-hexane cracking compared to large zeolite crystals obtained in the absence of CTAB.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties

et al. 2021

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“…The synthesized sample isotherm showed a high absorption at low partial pressures of less than 0.1, suggesting the presence of micropores in the zeolite sample. On the other hand, the hysteresis loop in the region 0.45 ˂ P / P0 <0.95 corresponds to a narrow or capillary density in the mesoporous material [87,88].…”

Section: Bet/bjh Analysismentioning

confidence: 99%

INVESTIGATION OF “MCM-22”, “ZSM-12 & 35 COMPOSITE”, and “ZEOLITE AL-MORDENITE & ZSM-39 COMPOSITE” CRYSTALS BY ANALYSIS OF CHARACTERIZATION TECHNIQUES

Kamani

Rahmati

Vandani

et al. 2021

J. Chil. Chem. Soc.

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Zeolites are three-dimensional, microporous, crystalline solids with well-defined structures that contain aluminum, silicon, and oxygen in their form. Cations and water are located in the pores of zeolites. They have a framework structure, in which interconnected cavities are occupied by large metal cations (positively charged ions), and water molecules. The formation of specific zeolites can occur by more than one crystallization pathway. Control in the crystallization pathway can lead to the formation of different species. In this study, two new zeolite nanocomposites were synthesized using fixed raw materials including solvent, reagent (which acts as a template in the formation of zeolite morphology), silica source, and sodium hydroxide alkali. "MCM-22" mesoporous was first synthesized and then a new morphology of "MCM-22" was synthesized by changing the temperature, time, and amount of water. Also, two nanocomposites "ZSM-12 & 35 Composite" and "Zeolite Al-mordenite & ZSM-39 Composite" were synthesized with very different properties in terms of surface to volume ratio, acidity, specific surface area, ratio of Si to Al, and three-dimensional crystal structure. Various characterization techniques were used to provide information to better understand the structural properties of crystalline zeolites. They were then characterized, and analyzed using X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Fourier-Transform Infrared Spectroscopy (FTIR), Energy-Dispersive X-ray Spectroscopy (EDS), Mapping, and BET/BJH (Brunauer-Emmett-Teller (BET) and Barret-Joyner-Halenda (BJH)) techniques. The results showed that the synthetic zeolites, despite having the same precursors, differed in terms of surface to volume ratio, acidity, specific surface area, Si/Al ratio, and three-dimensional crystal structure.

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“…[28][29][30][31] Zeolites have some appealing physical properties, which include regular porosity, interconnected pore structures, and channels with shape-dependent selectivity. [32] Several investigations have been carried out on zeolites related to gas separation and CO 2 capture, depending on their physical properties such as porosity, ion exchange capacity, selectivity, and diffusibility. [33][34][35][36][37] During the 20th century, the recognition of potential use of zeolites Y in industrial processes was escalated.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of zeolite Y from green materials

et al. 2021

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Several probes have been conducted by the scientific community to reduce emissions of greenhouse gases such as carbon dioxide (CO 2 ). A zeolitic material is capable of CO 2 adsorption with the aid of such technologies. Our present work is to efficiently synthesize zeolite Y with four Si/Al ratios (2.0, 2.5, 3.0, and 3.5) from green materials such as rice husk ash (source of Si) and metakaolin (source of Al). The method for preparing zeolite Y involves hydrothermal synthesis in a hydrodynamic reactor at 120 C temperature, for a reaction time of 24 hours. These synthetic zeolites represent high values for surface area as well as pore volume in micropore range and are compatible with the size of CO 2 molecules. The zeolite Y (with Si/Al ratio 3.5) has an absorption capacity of 3.35 mmol CO 2 /g at (900 kPa) pressure, thereby

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Synthesis and characterization of mordenite zeolite from metakaolin and rice husk ash as a source of aluminium and silicon

Cited by 26 publications

References 61 publications

Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties

Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties

INVESTIGATION OF “MCM-22”, “ZSM-12 & 35 COMPOSITE”, and “ZEOLITE AL-MORDENITE & ZSM-39 COMPOSITE” CRYSTALS BY ANALYSIS OF CHARACTERIZATION TECHNIQUES

Hydrothermal synthesis of zeolite Y from green materials

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Synthesis and characterization of mordenite zeolite from metakaolin and rice husk ash as a source of aluminium and silicon

Cited by 26 publications

References 61 publications

Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties

Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties

INVESTIGATION OF &#8220;MCM-22&#8221;, &#8220;ZSM-12 &amp; 35 COMPOSITE&#8221;, and &#8220;ZEOLITE AL-MORDENITE &amp; ZSM-39 COMPOSITE&#8221; CRYSTALS BY ANALYSIS OF CHARACTERIZATION TECHNIQUES

Hydrothermal synthesis of zeolite Y from green materials

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Product

Resources

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INVESTIGATION OF “MCM-22”, “ZSM-12 & 35 COMPOSITE”, and “ZEOLITE AL-MORDENITE & ZSM-39 COMPOSITE” CRYSTALS BY ANALYSIS OF CHARACTERIZATION TECHNIQUES