Uncovering the role of Lewis and Brønsted acid sites in perforated SAPO-34 with an enhanced lifetime in methanol conversion to light olefins

Ghavipour, Mohammad; Goncalves, Tiago J.; Al Hussami, Ralph; Roy, Ranjan; Siahrostami, Samira; Kopyscinski, Jan

doi:10.1039/d3nj02514d

Cited by 4 publications

(1 citation statement)

References 79 publications

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“…formation is only feasible on strong acid sites(Ghavipour et al 2023). It is well known that the appropriate strength and amount of strong-acid sites on the surface of SAPO-34 is crucial to achieving high selectivity of light ole n, as demonstrated in the previous report(Wang et al 2013;Hasnain Bakhtiar et al 2024).…”

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confidence: 84%

Enhanced coke resistance in methanol to olefins reaction via surplus mesoporosity of fibrous silica-wrapped SAPO-34

Sofi,

Hamid,

Jalil

et al. 2024

Preprint

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Growing concerns regarding the depletion of petroleum reserves and energy demand necessitate the exploration of alternative methods, such as methanol-to-olefin (MTO), to generate light olefins from non-crude oil sources. However, the industrial application of this method is limited due to the rapid deactivation of the catalyst, which is caused by the microporosity of the commercial catalyst. Here, we synthesized the fibrous silica-wrapped silico-alumino-phosphate (FSAPO-34) using a microemulsion technique with a seed-assisted synthesis method and applied it for the first time in the MTO reaction. The physicochemical properties of the fresh and spent catalysts were characterized by X-ray diffractometer, Fourier transform infrared spectroscopy-potassium bromide, N2 physisorption, field emission scanning electron microscopy, transmission electron microscopy, NH3 temperature-programmed desorption, thermal gravimetric analysis, O2 temperature-programmed oxidation, and Raman spectroscopy. The findings indicated that the formation of fibrous silica on the surface of SAPO-34 exhibited a unique spherical morphology with dendrimeric silica fiber, significantly enhancing the mesoporosity from 0.098 to 1.749 cm³/g compared to commercial microporous SAPO-34. FSAPO-34 demonstrates a significant improvement in catalytic lifetime, with a 54% increase, from 19.2 hours to 29.5 hours, compared to commercial SAPO-34. This enhanced stability is attributed to the introduction of mesoporosity in FSAPO-34, which, in turn, provides high accessibility and reduced diffusion resistance of products and ultimately retarded the formation of coke.

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confidence: 84%

Enhanced coke resistance in methanol to olefins reaction via surplus mesoporosity of fibrous silica-wrapped SAPO-34

Sofi,

Hamid,

Jalil

et al. 2024

Preprint

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Comparison of Aminothermal and Hydrothermal Synthesis of SAPO-34: Impact of Synthesis Conditions on Catalyst Characteristics and MTO Catalytic Performance

Zare,

Nazari,

Behbahani

et al. 2023

Silicon

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The present study investigates the aminothermal synthesis of SAPO-34 using various templates, including morpholine, diethylamine, triethylamine, triethanolamine, diglycolamine, and diisopropylamine, under static conditions. The catalyst's characteristics were assessed through XRD, SEM, and EDS analyses, and the catalytic behavior of the samples was studied in the MTO reaction. The results indicate that only morpholine leads to the formation of pure SAPO-34, and it is essential to regulate the crystallization time to prevent the formation of SAPO-20. Furthermore, the impact of the order of reactant addition and the intensity of stirring during aging on catalyst characteristics was investigated, and the outcomes were compared to those of the hydrothermally synthesized sample. The ndings reveal that the aminothermal method reduces the crystallization time and enhances silica incorporation. However, this technique is recommended for the synthesis using polar templates or in the presence of polar additives.The utilization of non-polar templates such as DEA and TEA resulted in very thick pastes. The catalytic performance of the aminothermal samples was comparable to that of the hydrothermal samples, with a methanol conversion of over 98% and a selectivity to light ole ns of approximately 80%. Nevertheless, the impact of preparation, aging, and post-treatment conditions on the hydrogen transfer index and alkanes production was signi cant.

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Direct growth of SAPO-34 crystals on ɣ-Al2O3 microspheres: A designated catalyst for fluidized-bed reactors of methanol conversion to light olefins

Ghavipour,

Kopyscinski

2024

Catalysis Today

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Uncovering the role of Lewis and Brønsted acid sites in perforated SAPO-34 with an enhanced lifetime in methanol conversion to light olefins

Abstract: Perforated SAPO-34 by alkali post-treatment lasts longer in the MTO reaction. However, based on the TGA-TPO, GC-MS, 13C-NMR tests and DFT calculations, alteration in acid sites results in lower light olefins selectivity.

Cited by 4 publications

References 79 publications

Enhanced coke resistance in methanol to olefins reaction via surplus mesoporosity of fibrous silica-wrapped SAPO-34

Enhanced coke resistance in methanol to olefins reaction via surplus mesoporosity of fibrous silica-wrapped SAPO-34

Comparison of Aminothermal and Hydrothermal Synthesis of SAPO-34: Impact of Synthesis Conditions on Catalyst Characteristics and MTO Catalytic Performance

Direct growth of SAPO-34 crystals on ɣ-Al2O3 microspheres: A designated catalyst for fluidized-bed reactors of methanol conversion to light olefins

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