The theatre at mid-century

Gies, David T.

doi:10.1017/cbo9780511627637.006

Cited by 2 publications

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“…The same material may behave as a clathrate with respect to large guests and as a zeoate for smaller guests. This aspect has been shown already by Gies (1986a) for the poroate D3R, which was synthesized with 1-aminoadamantane as structure-directing agent (template). D3R is a clathrate with respect to this rather large guest molecule.…”

Section: Application Of Solv To Inorganic Microporous Phasesmentioning

confidence: 66%

The determination of pore volumes, pore shapes and diffusion paths in microporous crystals

2006

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The original option SOLV of the program PLATON, which is primarily devoted to the study of organic structures, has been extended to studies of microporous inorganic crystals. The space that is available for a potential spherical guest within a pore can be regarded as being outlined by rolling a sphere of the guest's radius over the surfaces of the host atoms that form the pore. The volumes of the pores are determined in Å 3 and the pore shapes can be drawn. The pore volumes of several microporous phases have been calculated and compared with results obtained with other methods. An essential feature of the program is the option to vary a parameter called 'probe radius', which models the size of a guest. The decision whether a void is a pore or not and the dimensionality of a pore depend on the radius of the guest, which is approximated by a sphere. This is demonstrated for the structure of the zeolite afghanite. With decreasing probe radius, cages can coalesce into larger cages and finally into channels and channel systems. The variation of the probe radius allows one to determine whether a window between adjacent pores is permeable to guests; in addition, diffusion paths in zeolites and zeolite-like structures can be determined and visualized.

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Section: Application Of Solv To Inorganic Microporous Phasesmentioning

confidence: 66%

The determination of pore volumes, pore shapes and diffusion paths in microporous crystals

2006

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“…An early example of an all‐silica zeolite for kinetic propylene/propane separation is DD3R reported by Zhu et al DD3R is built from corner‐sharing SiO 4 . Its 4 3 5 12 6 1 8 3 cavities are interconnected by 8MRs with an aperture around 4.5 Å . It was found that the saturated uptake amounts of ethane, ethylene, and propylene are comparable to each other.…”

Section: Zeolites For Adsorptive Light Olefin/paraffin Separationsmentioning

confidence: 99%

Alternatives to Cryogenic Distillation: Advanced Porous Materials in Adsorptive Light Olefin/Paraffin Separations

Wang

Peh

Zhao

2019

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As primary feedstocks in the petrochemical industry, light olefins such as ethylene and propylene are mainly obtained from steam cracking of naphtha and short chain alkanes (ethane and propane). Due to their similar physical properties, the separations of olefins and paraffins—pivotal processes to meet the olefin purity requirement of downstream processing—are typically performed by highly energy‐intensive cryogenic distillation at low temperatures and high pressures. To reduce the energy input and save costs, adsorptive olefin/paraffin separations have been proposed as promising techniques to complement or even replace cryogenic distillation, and growing efforts have been devoted to developing advanced adsorbents to fulfill this challenging task. In this Review, a holistic view of olefin/paraffin separations is first provided by summarizing how different processes have been established to leverage the differences between olefins and paraffins for effective separations. Subsequently, recent advances in the development of porous materials for adsorptive olefin/paraffin separations are highlighted with an emphasis on different separation mechanisms. Last, a perspective on possible directions to push the limit of the research in this field is presented.

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The theatre at mid-century

Cited by 2 publications

References 0 publications

The determination of pore volumes, pore shapes and diffusion paths in microporous crystals

The determination of pore volumes, pore shapes and diffusion paths in microporous crystals

Alternatives to Cryogenic Distillation: Advanced Porous Materials in Adsorptive Light Olefin/Paraffin Separations

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