Mechanism of selectivity control for zeolites modified with organic monolayers

Zhou, Xinpei; Falconer, John L.; Medlin, J. Will

doi:10.1016/j.micromeso.2022.111913

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…Moreover, to enhance selective adsorption, the external surface of zeolites can be modified with an additional diffusion layer or functional group (Peng et al, 2020). Another approach is to adjust the pore openings of zeolites to improve adsorption selectivity (Zhou et al, 2022).…”

Section: Catalystsmentioning

confidence: 99%

The master key: structural science in unlocking functional materials advancements

Suarez

2024

J Appl Cryst

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From the historical roots of metalworking to the forefront of modern nanotechnology, functional materials have played a pivotal role in transforming societies, and their influence is poised to persist into the future. Encompassing a wide array of solid-state materials, spanning semiconductors to polymers, molecular crystals to nanoparticles, functional materials find application in critical sectors such as electronics, computers, information, communication, biotechnology, aerospace, defense, environment, energy, medicine and consumer products. This feature article delves into diverse instances of functional materials, exploring their structures, their properties and the underlying mechanisms that contribute to their outstanding performance across fields like batteries, photovoltaics, magnetics and heterogeneous catalysts. The field of structural sciences serves as the cornerstone for unraveling the intricate relationship between structure, dynamics and function. Acting as a bridge, it connects the fundamental understanding of materials to their practical applications.

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Section: Catalystsmentioning

confidence: 99%

The master key: structural science in unlocking functional materials advancements

Suarez

2024

J Appl Cryst

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“…Song et al [88] created a composite molecular sieve adsorbent by depositing an ultra-thin, porous TiO 2 coating on the outer surface of 5A molecular sieve, which increased the adsorption selectivity of C 3 H 6 /C 3 H 8 substantially. Zhou et al [89] coated zeolite 5A with n-octadecylphosphonic acid (ODPA), which increased the kinetic selectivity of C 3 H6/C 3 H 8 substantially over untreated 5A. Adsorption separation of low-carbon hydrocarbons (C 1 -C 3 ) utilizing metal-organic frameworks and molecular sieves has made significant progress.…”

Section: Molecular Sieves For Propylene/propane Separationmentioning

confidence: 99%

Progress in the Separation and Purification of Carbon Hydrocarbon Compounds Using MOFs and Molecular Sieves

Zhou,

Li,

Wang

et al. 2023

Separations

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Carbon hydrocarbon compounds, especially low-carbon hydrocarbons (C1–C3), are vital raw materials in the petrochemical industry, but their efficient separation has great challenges due to their similar molecular structures and properties. In contrast to traditional low-temperature distillation and absorption separation technologies, selective adsorption employing porous materials as adsorbent has the advantages of low energy consumption, high efficiency, and high selectivity, indicating broad application possibilities in the field of low-carbon hydrocarbon separation. In this paper, the recent progress in the separation and purification of hydrocarbon mixtures by means of the two kinds of porous materials (metal–organic frameworks and molecular sieves) that have been widely used in recent years is reviewed, including purification of methane and separation of ethylene/ethane, propylene/propane, and some high-carbon hydrocarbon isomers. The structure–activity relationships between their chemical composition, structural characteristics, and separation performance are discussed to understand the separation mechanism. In conclusion, the issues encountered in the application of metal–organic frameworks and molecular sieves in the separation of low-carbon hydrocarbons are discussed in light of the current context of “carbon neutrality”.

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Using Phosphonic Acid Monolayers to Control CO₂ Adsorption and Hydrogenation on Pt/Al₂O₃

Blanchette,

Zhou,

Schwartz

et al. 2024

ChemCatChem

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Phosphonic acid (PA) self‐assembled monolayers (SAMs) were deposited onto Pt/Al2O3 catalysts to enable control over CO2 adsorption and CO2 hydrogenation activity. Significant differences in catalytic activity toward CO2 hydrogenation (reverse water‐gas shift, RWGS) were observed after coating Al2O3 with PAs, suggesting that the reaction was mediated by CO2adsorption on the support. Amine‐functionalized PAs were found to outperform their alkyl counterparts in terms of activity, however there was little effect of amine location in the SAM (i.e., spacing between the amine functional group and phosphonate attachment group). One amine‐PA and one alkyl‐PA, aminopropyl phosphonic acid (C3NH2PA) and methyl phosphonic acid (C1PA), respectively, were investigated in more detail. The C3NH2PA‐modified catalyst was found to bind CO2 as a combination of carbamate and bicarbonate. Additionally, at 30 °C, both PAs were found to reduce CO2 adsorption uptake by approximately 50% compared to unmodified 5%Pt/Al2O3. CO2 adsorption enthalpy was measured for the catalysts and found to be strongly correlated with hydrogenation activity, with the trend in binding enthalpy and CO2 hydrogen rate trending as uncoated > C3NH2PA > C1PA. PA SAMs were found to have weaker effects on CO binding and CO selectivity, consistent with selective modification of the Al2O3support by the PAs.

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Mechanism of selectivity control for zeolites modified with organic monolayers

Cited by 6 publications

References 30 publications

The master key: structural science in unlocking functional materials advancements

The master key: structural science in unlocking functional materials advancements

Progress in the Separation and Purification of Carbon Hydrocarbon Compounds Using MOFs and Molecular Sieves

Using Phosphonic Acid Monolayers to Control CO₂ Adsorption and Hydrogenation on Pt/Al₂O₃

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Mechanism of selectivity control for zeolites modified with organic monolayers

Cited by 6 publications

References 30 publications

The master key: structural science in unlocking functional materials advancements

The master key: structural science in unlocking functional materials advancements

Progress in the Separation and Purification of Carbon Hydrocarbon Compounds Using MOFs and Molecular Sieves

Using Phosphonic Acid Monolayers to Control CO2 Adsorption and Hydrogenation on Pt/Al2O3

Contact Info

Product

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About

Using Phosphonic Acid Monolayers to Control CO₂ Adsorption and Hydrogenation on Pt/Al₂O₃