The influence of cation exchange and tetravalent metal substitutions in Lewis acidic BEA zeolites for phenol adsorption and Tautomerization: A computational study

Tiewcharoen, Supakit; Maihom, Thana; Sittiwong, Jarinya; Limtrakul, Jumras

doi:10.1016/j.cplett.2021.138886

Cited by 5 publications

(3 citation statements)

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“…[190] Density functional theory calculation predicted that Zr-Beta and Sn-Beta can catalyze phenol tautomerization and the catalytic performance was enhanced to some extent with the exchange of alkali metal ions (Figure 17B). [191] After further analysis, it was found that this reaction contained two steps, the dissociation of O-H in phenol and the subsequent protonation of the intermediate, where the first one was the rate-determining step. [192] N-alkylation reaction of aniline with benzyl alcohol was attempted over various silicates (MFI and Beta) with Sn, Ti, Zr, and Hf active sites.…”

Section: Other Reactionsmentioning

confidence: 99%

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Synthesis and Catalytic Applications of Advanced Sn‐ and Zr‐Zeolites Materials

Liu,

Zhu

2023

Advanced Science

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The incorporation of isolated Sn (IV) and Zr (IV) ions into silica frameworks is attracting widespread attention, which exhibits remarkable catalytic performance (conversion, selectivity, and stability) in a broad range of reactions, especially in the field of biomass catalytic conversion. As a representative example, the conversion route of carbohydrates into valuable platform and commodity chemicals such as lactic acid and alkyl lactates, has already been established. The zeotype materials also possess water‐tolerant ability and are capable to be served as promising heterogeneous catalysts for aqueous reactions. Therefore, dozens of Sn‐ and Zr‐containing silica materials with various channel systems have been prepared successfully in the past decades, containing 8 membered rings (MR) small pore CHA zeolite, 10‐MR medium pore zeolites (FER, MCM‐56, MEL, MFI, MWW), 12‐MR large pore zeolites (Beta, BEC, FAU, MOR, MSE, MTW), and 14‐MR extra‐large pore UTL zeolite. This review about Sn‐ and Zr‐containing metallosilicate materials focuses on their synthesis strategy, catalytic applications for diverse reactions, and the effect of zeolite characteristics on their catalytic performances.

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Section: Other Reactionsmentioning

confidence: 99%

mentioning

confidence: 99%

Synthesis and Catalytic Applications of Advanced Sn‐ and Zr‐Zeolites Materials

Liu,

Zhu

2023

Advanced Science

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“…Various types of adsorbent materials can be employed, such as activated carbon (Hua et al, 2012; Q.S. Liu et al, 2010;Zeboudj et al, 2014), zeolites (Cheng et al, 2016;Tiewcharoen et al, 2021), ion exchange resins, and polymers. These materials possess a high specific surface area (SSA) and chemical properties that facilitate the adsorption of phenol.…”

Section: Introductionmentioning

confidence: 99%

The Removal of Phenol Through Adsorption onto Synthetic Calcium Phosphates – A Study Encompassing Analyses of Kinetics and Thermodynamics

El Bakri,

El Boujaady,

Ferraa

et al. 2024

Ecol. Eng. Environ. Technol.

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The characteristics and suitability of hydroxyapatite (HAP), tricalcium apatite phosphate (PTCa), and octocalcium apatite phosphate (OCPa), which possess similar attributes to those of an ideal adsorbent, were investigated to determine their efficacy in phenol removal. The aim of this paper is to assess the adsorption behavior of phenol on phosphates powders synthesized by the co-precipitation method at ambient temperature. Furthermore, the impact of initial phenol quantities and thermal conditions on the adsorption process was explored. X-ray diffraction analysis revealed the formation of HAP, PTCa, and OCPa structures under room temperature conditions. The sample morphologies were subjected to scrutiny utilizing MEB together with X-ray analysis. Additionally, chemical analysis revealed that Ca/P = 1.6, 1.5, and 1.33 for HAP, PTCa, and OCPa, respectively. The synthesized powders exhibited adsorption abilities of 2.86, 2.74, and 2.52 mg/g for HAP, PTCa, and OCPa, respectively, and reached equilibrium in approximately 80 minutes. The study revealed that the experimental data are appropriately represented by the Langmuir and Freundlich adsorption equations for HAP and PTCa, and Langmuir model in the case of OCPa, as well as by the pseudo-first-order and pseudo-second-order adsorption kinetics. Thermodynamic evaluations, including calculations of ΔG°, ΔH°, and ΔS°, were performed. The results indicated that the adsorption mechanisms exhibited physical characteristics, were thermally absorbing in the case of HAP and exothermic for the other two phosphates, PTCa and OCPa, and occurred spontaneously.

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