Catalytic cracking of vacuum gasoil over -SVR, ITH, and MFI zeolites as FCC catalyst additives

Hussain, Abdelrahman; Arudra, Palani; Aitani, Abdullah M.; Čejka, Jiřı́; Shamzhy, Mariya; Kubů, Martin; Al-Khattaf, S.

doi:10.1016/j.fuproc.2017.01.050

“…It has been reported that the structural and acidic properties of Al-ITH make it a good alternative to ZSM-5 as shape selective FCC additive for producing propylene. [27,49] Thus, the catalytic behavior of the Al-ITH sample and two ZSM-5 samples have been compared for catalytic cracking of a vacuum gasoil (VGO; see the Supporting Information, Table S8 for VGO properties) in a microactivity test unit. [28] The results are shown in the Supporting Information, Figures S15-S17.…”

Section: Before the Crystallization Only An Amorphous Phase Is Obsermentioning

confidence: 99%

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

Lei

¹

,

Dong

²

,

Martı́nez

³

et al. 2020

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There are a large number of zeolites, such as ITH, that cannot be prepared in the aluminosilicate form. Now, the successful synthesis of aluminosilicate ITH zeolite using a simple cationic oligomer as an organic template is presented. Key to the success is that the cationic oligomer has a strong complexation ability with aluminum species combined with a structural directing ability for the ITH structure similar to that of the conventional organic template. The aluminosilicate ITH zeolite has very high crystallinity, nanosheet‐like crystal morphology, large surface area, fully four‐coordinated Al species, and abundant acidic sites. Methanol‐to‐propylene (MTP) tests reveal that the Al‐ITH zeolite shows much higher selectivity for propylene and longer lifetime than commercial ZSM‐5. FCC tests show that Al‐ITH zeolite is a good candidate as a shape‐selective FCC additive for enhancing propylene and butylene selectivity.

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“…It has been reported that the structural and acidic properties of Al-ITH make it ag ood alternative to ZSM-5 as shape selective FCC additive for producing propylene. [27,49] Thus,t he catalytic behavior of the Al-ITH sample and two ZSM-5 samples have been compared for catalytic cracking of av acuum gasoil (VGO;s ee the Supporting Information, Table S8 for VGOp roperties) in am icroactivity test unit. [28] Ther esults are shown in the Supporting Information, Figures S15-S17.…”

Section: Before the Crystallization Only An Amorphous Phase Is Obsermentioning

confidence: 99%

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

Lei

¹

,

Dong

²

,

Martı́nez

³

et al. 2020

View full text Add to dashboard Cite

There are a large number of zeolites, such as ITH, that cannot be prepared in the aluminosilicate form. Now, the successful synthesis of aluminosilicate ITH zeolite using a simple cationic oligomer as an organic template is presented. Key to the success is that the cationic oligomer has a strong complexation ability with aluminum species combined with a structural directing ability for the ITH structure similar to that of the conventional organic template. The aluminosilicate ITH zeolite has very high crystallinity, nanosheet‐like crystal morphology, large surface area, fully four‐coordinated Al species, and abundant acidic sites. Methanol‐to‐propylene (MTP) tests reveal that the Al‐ITH zeolite shows much higher selectivity for propylene and longer lifetime than commercial ZSM‐5. FCC tests show that Al‐ITH zeolite is a good candidate as a shape‐selective FCC additive for enhancing propylene and butylene selectivity.

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“…[3] They attributed this difference to a higher shape selectivity towards propene caused by the narrower pore dimensions, a finding that was confirmed in subsequent work. [5] ITQ-13 was also found to give a product spectrum different from other zeolite catalysts (ZSM-5, MCM-22) in methanol-to-hydrocarbon (MTH) conversions, potentially enhancing the flexibility of the MTH process in the context of varying demands for different products. [6] ITQ-13 is the type material of the ITH framework, [7] which can be decomposed into four types of discrete cages: double-four ring (d4r) cages (face symbol [4 6 ], labelled t-cub in the nomenclature of natural tilings [8] ), lau cages (face symbol [4 2 •6 4 ], t-lau), stf cages (face symbol [4•5 6 ], t-nuh) and [4•5 2 •6 2 ] cages (t-mel).…”

Section: Introductionmentioning

confidence: 99%

Elucidating the germanium distribution in ITQ-13 zeolites by density functional theory

Fischer

¹

,

Bornes

²

,

Mafra

³

et al. 2022

Preprint

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ITQ-13 is a medium-pore zeolite that can be prepared in all-silica form and as silicogermanate with Si/Ge ratios as low as 3. Usually synthesised in the presence of fluoride, ITQ-13 is among the very few systems containing fluoride anions in two distinct cage types, cube-like d4r units and [4·56] cages. Here, dispersion-corrected density functional theory (DFT) calculations are used to investigate the energetically most favourable Ge distributions for Si/Ge ratios between 55 and 6. The calculations show Ge atoms are incorporated at both the corners of d4r cages and at the basal plane of the [4·56] cages, in accordance with 19F-NMR spectroscopy. Two Ge atoms at adjacent corners of [4·56] cages are stable at the highest Ge content considered (Si/Ge = 6). Such a local environment has not yet been considered in the experimental literature. A calculation of the corresponding 19F-NMR resonance points to overlap with other resonances, which might preclude its clear identification. Additional calculations investigate the variation of the dynamic behaviour of the fluoride anions as a function of the local environment as well as the selective defluorination of the [4·56] cages.

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Catalytic cracking of vacuum gasoil over -SVR, ITH, and MFI zeolites as FCC catalyst additives

Cited by 35 publications

References 38 publications

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

Elucidating the germanium distribution in ITQ-13 zeolites by density functional theory

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