Dimethyl ether conversion to olefins in a slurry reactor: the effect of MFI zeolite catalyst acidity and selectivity control

Колесниченко, Н. В.; Павлов, В. С.; Stashenko, A. N.; Yashina, O. V.; Ежова, Н. Н.; Коннов, С. В.; Хаджиев, С. Н.

doi:10.1007/s11144-018-1368-2

Cited by 8 publications

(3 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This technology makes it possible to considerably decrease catalyst deactivation, because in the SLR catalytic suspensions based on the nanosized zeolite with a more developed surface are used; as a result, diffusion limitations are reduced. However, as was shown previously, 46 nanosized zeolite catalysts with a SiO 2 :Al 2 O 3 molar ratio of ~30 rapidly lose activity (DME conversion decreased from 80 to 30%) in DME conversion to light olefins in SLR. The loss of activity was attributed to the formation of polysubstituted aromatic compounds.…”

Section: Introductionsupporting

confidence: 71%

“…Selectivity for light olefins decreased over time in both FBR and SLR (Table 1), suggesting that initial selectivity was lower in the SLR. It is probable that a sharp loss of activity in the SLR is related to the presence of the dispersion medium rather than the high Brønsted acidity 46 …”

Section: Resultsmentioning

confidence: 99%

“…The particle size of the ground zeolite sample was determined via scanning electron microscopy (SEM) on a ZEISS 10 40 SEM_SEI SEM (Zeiss, Jena, Germany) and through dynamic light scattering on a Zetasizer Nano SZ particle analyzer (Malvern Panalytical, Malvern, UK). The catalyst is morphologically heterogeneous, and although large particles (>3 μm) form the basis of ZSM‐5, there also are nanoscale particles (200–800 nm) among them 44,46 …”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Dimethyl ether conversion to light olefins in slurry and fixed‐bed reactors: coke nature and location on Mg/ZSM‐5 catalyst

Obukhova

Stashenko

Батова

et al. 2021

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND The goal of this study was to investigate the deactivation of ZSM‐5 in the DTO process (dimethyl ether to light olefins) in a slurry reactor (SLR) in polydimethylsiloxane dispersion medium compared with its deactivation in a fixed‐bed reactor (FBR), and to unveil reasons behind the rapid deactivation of the catalyst in the SLR. RESULTS Under suspension conditions coke formation proceeds more slowly compared with fixed‐bed conditions: The amount of coke formed under suspension conditions is less than under fixed‐bed conditions, 1.4 mg versus 1.7 mg, respectively. Also, in terms of the chemical composition the coke is lighter (xylenes and trimethylbenzenes versus С4,5,6‐substituted benzenes). Using thermogravimetric analysis and gas chromatography/mass spectrometry pyrolytic system, it was shown that the decomposition products of the dispersion medium contribute to the blocking of micropores and the rapid deactivation of the catalyst in SLR. The localization of coke in both SLR and FBR occurs primarily in the microporous channels of the zeolite (>60%). In SLR, the weight fraction of coke on the external catalyst surface was 11% higher than that on the FBR. This finding can be attributed to the blocking of micropores by decomposition products of the dispersion medium. CONCLUSION Under suspension conditions, сoke formation in the DTO process proceeds more slowly compared with fixed‐bed conditions. The rapid loss of catalyst activity in the SLR was related not to coke formation, but instead to the blocking of catalyst pores by products of thermal decomposition of the dispersion medium. For the same reason, in SLR the weight fraction of coke on the external surface of the catalyst was higher than that in the FBR. © 2021 Society of Chemical Industry (SCI).

show abstract

Section: Introductionsupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Dimethyl ether conversion to light olefins in slurry and fixed‐bed reactors: coke nature and location on Mg/ZSM‐5 catalyst

Obukhova

Stashenko

Батова

et al. 2021

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

Dimethyl Ether Conversion to Light Olefins on Zeolite Catalysts: Effect of MFI-Type Zeolite Nature and SiO2/Al2O3 Molar Ratio on Catalyst Efficiency

et al. 2019

View full text Add to dashboard Cite

Lower olefins from methane: recent advances

Колесниченко¹,

Ежова²,

Snatenkova³

2020

Russ. Chem. Rev.

View full text Add to dashboard Cite

Modern methods for methane conversion to lower olefins having from 2 to 4 carbon atoms per molecule are generalized. Multistage processing of methane into ethylene and propylene via syngas or methyl chloride and methods for direct conversion of CH4 to ethylene are described. Direct conversion of syngas to olefins as well as indirect routes of the process via methanol or dimethyl ether are considered. Particular attention is paid to innovative methods of olefin synthesis. Recent achievements in the design of catalysts and development of new techniques for efficient implementation of oxidative coupling of methane and methanol conversion to olefins are analyzed and systematized. Advances in commercializing these processes are pointed out. Novel catalysts for Fischer – Tropsch synthesis of lower olefins from syngas and for innovative technique using oxide – zeolite hybrid catalytic systems are described. The promise of a new route to lower olefins by methane conversion via dimethyl ether is shown. Prospects for the synthesis of lower olefins via methyl chloride and using non-oxidative coupling of methane are discussed. The most efficient processes used for processing of methane to lower olefins are compared on the basis of degree of conversion of carbonaceous feed, possibility to integrate with available full-scale production, number of reaction stages and thermal load distribution. The bibliography includes 346 references.

show abstract

Dimethyl ether conversion to olefins in a slurry reactor: the effect of MFI zeolite catalyst acidity and selectivity control

Cited by 8 publications

References 45 publications

Dimethyl ether conversion to light olefins in slurry and fixed‐bed reactors: coke nature and location on Mg/ZSM‐5 catalyst

Dimethyl ether conversion to light olefins in slurry and fixed‐bed reactors: coke nature and location on Mg/ZSM‐5 catalyst

Dimethyl Ether Conversion to Light Olefins on Zeolite Catalysts: Effect of MFI-Type Zeolite Nature and SiO2/Al2O3 Molar Ratio on Catalyst Efficiency

Lower olefins from methane: recent advances

Contact Info

Product

Resources

About