Methanol conversion over acid solid catalysts

Travalloni, Leonardo; Gomes, Alexandre Cunha; Gaspar, Alexandre B.; Silva, Mônica A. P. da

doi:10.1016/j.cattod.2007.12.060

Cited by 56 publications

(23 citation statements)

References 14 publications

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“…The conversion of methanol into DME appears to take place on weak acid sites, and that of DME into olefins takes place on strong acid sites [13,26]. The formation of coke on the strong acid site results in deactivation of the conversion of DME into olefins.…”

Section: Mto and Dto Reaction Over Sapo-34mentioning

confidence: 93%

Light Olefins Synthesis from Methanol and Dimethylether over SAPO-34 Nanocrystals

et al. 2010

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The catalytic properties of SAPO-34 nanocrystals (crystal size: 75 nm) on methanol-to-olefins (MTO) and dimethylether-to-olefins (DTO) reactions were compared with those of SAPO-34 (crystal size: 800 nm). The SAPO-34 nanocrystals showed a longer catalyst lifetime in both the reactions than 800 nm-sized SAPO-34. The rate of catalyst deactivation of SAPO-34 was similar for both the MTO and DTO reactions indicating that the reaction of MeOH to DME and the diffusion of MeOH and DME into the SAPO-34 nanocrystals are fast and are not a rate limiting process. A possible reason for the long catalyst lifetime of the SAPO-34 nanocrystals is a short residence time in a crystal for the produced hydrocarbons because of a shorter diffusion length.

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Section: Mto and Dto Reaction Over Sapo-34mentioning

confidence: 93%

Light Olefins Synthesis from Methanol and Dimethylether over SAPO-34 Nanocrystals

et al. 2010

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“…However, it shortly becomes deactivated in due to the blockage of crystal internal channels. Deactivation of SAPO-34 decreases olefins selectivity significantly and also prevents reactants diffusion [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Different techniques and their effective parameters in nano SAPO-34 synthesis: A review

et al. 2016

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“…FT-IR spectra of prepared SAPO-34 samples. (DME) occurs mainly on the weak acid sites while the conversion of DME and methanol to light olefins occurs mainly on the strong acid sites [24]. It is worthy of noting that for all prepared samples, the selectivity for propylene is higher than that for ethylene at lower temperatures, and then decreases, while the selectivity for ethylene approaches the same at high temperatures.…”

Section: Tg/dtg Analysismentioning

confidence: 80%

Facile synthesis of SAPO-34 with small crystal size for conversion of methanol to olefins

Han

et al. 2014

Powder Technology

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a b s t r a c t a r t i c l e i n f oSAPO-34 molecular sieves were fabricated by a dry gel liquid-phase transport method using morpholine (Mor) or morpholine-tetraethylammonium hydroxide (Mor-TEAOH) as the structure-directing agent (SDA). The prepared samples were characterized by scanning electron microscope (SEM), nitrogen adsorption-desorption, X-ray diffraction (XRD), ammonia temperature-programmed desorption (NH 3 -TPD), thermo-gravimetric analysis (TG) and Fourier transform infrared spectroscopy (FT-IR). The results indicated that the dry gel liquid-phase transport method is very effective to fabricate SAPO-34 molecular sieves with average crystal size about 0.6 μm using Mor-TEAOH as SDA and 3 μm using Mor as SDA, respectively. Moreover, the addition of TEAOH is beneficial to produce SAPO-34 with small crystal size. Methanol-to-olefins (MTO) reaction was chosen to test the catalytic performance of as-prepared SAPO-34 catalysts. The prepared SAPO-34 catalyst using Mor-TEAOH as SDA exhibited the excellent catalytic performance in MTO process owing to its small crystal size and high crystallinity. The conversion of methanol and selectivity of ethylene and propylene are up to 100% and 87.9%, respectively.

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Methanol conversion over acid solid catalysts

Cited by 56 publications

References 14 publications

Light Olefins Synthesis from Methanol and Dimethylether over SAPO-34 Nanocrystals

Light Olefins Synthesis from Methanol and Dimethylether over SAPO-34 Nanocrystals

Different techniques and their effective parameters in nano SAPO-34 synthesis: A review

Facile synthesis of SAPO-34 with small crystal size for conversion of methanol to olefins

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