Theta-1 zeolite catalyst for increasing the yield of propene when cracking olefins and its potential integration with an olefin metathesis unit

Blay, Vincent; Miguel, Pablo J.; Corma, Avelino

doi:10.1039/c7cy01502j

Cited by 19 publications

(26 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, together with results previously obtained using a unidimensional 10R zeolite such as Theta-1 with similar Si/Al ratio. 47 The main products obtained are propene, butenes, pentenes and ethene, followed by small amounts of alkanes and aromatics. It is important to remark that the mono-and bimolecular processes cannot be distinguished directly from the product distribution since the olefins, which are the main products, could be both products and reactants of several primary and secondary reactions.…”

Section: Cracking Of 1-hexene As a Test Reaction For Site Locationmentioning

confidence: 99%

Selective Introduction of Acid Sites in Different Confined Positions in ZSM-5 and Its Catalytic Implications

et al. 2018

Self Cite

View full text Add to dashboard Cite

Controlling the location of acid sites in zeolites can have a great impact on catalysis. In this work we face the objective of directing the location of Al into the 10R channels of ZSM-5 by taking advantage of the structural preference of B to occupy certain positions at the channels intersections, as suggested by theoretical calculations. The synthesis of B-Al-ZSM-5 zeolites with variable Si/Al and Si/B ratio, followed by B removal in a post synthesis treatment, produces ZSM-5 samples enriched in Al occupying positions at 10R channels. The location of the acid sites is determined on the basis of the product distribution of 1-hexene cracking as test reaction. The higher selectivity to propene and lower C4 = /C3 = ratio in the samples synthesized with B and subsequently deboronated can be related to a larger concentration of acid sites in 10R channels, where monomolecular cracking occurs. Finally, several ZSM-5 samples have been tested in the methanol to propene reaction, and those synthesized through the B assisted method show longer catalytic lifetime, higher propene yield and lower yield of alkanes and aromatics.

show abstract

Section: Cracking Of 1-hexene As a Test Reaction For Site Locationmentioning

confidence: 99%

Selective Introduction of Acid Sites in Different Confined Positions in ZSM-5 and Its Catalytic Implications

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…[37][38][39] Within the olefin cycle of the HCP, olefins convert methanol to olefins autocatalytically, where olefins are repeatedly methylated to higher olefins that are subsequently cracked to lighter olefins. 28,[40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] In the dual cycle concept (see Scheme 1) aromatic species also play a role in the production of light olefins, and ethene and propene in particular. 6,[8][9][10][11][12][13][14]30 This is highly interesting both from a conceptual but also practical point of view, as the selectivity towards lighter olefins might significantly differ for these two cycles.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of the side-chain mechanism of the MTO process over H-SSZ-13 using DFT and ab initio calculations

Fečík

Pleßow

Studt

2021

Catal. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Therefore, differentiating diffusivities in straight and sinusoidal channels for these anisotropic molecules over H-ZSM-5 zeolites are benefit to the understanding of activity, stability or product distribution in catalysis and the guidance of catalyst design with designated morphology. The catalytic cracking of low-value C4+ olefins fractions (OCC), deriving from fluid catalytic cracking (FCC) and methanol to olefins (MTO) processes 7,[20][21][22] , represents a meaningful route to improve the ethylene and propylene production (important to the polymer industry) using H-ZSM-5 catalysts in industrial application [23][24][25][26][27] . Herein, the olefin catalytic cracking process was employed to clarify the descriptor of morphology effect in catalysis process by revealing the diffusion anisotropy in straight and sinusoidal channels of H-ZSM-5 zeolite.…”

Section: Schame 1 Amentioning

confidence: 99%

Diffusion anisotropy descriptor revealing morphology effect of H-ZSM-5 zeolite for olefin catalytic cracking

Liu

Shi

Yang

et al. 2021

Preprint

View full text Add to dashboard Cite

Zeolite morphology is vital in determining catalytic activity, selectivity and stability in zeolite catalysis, while quantitative description of morphology effect is great challenging but highly desirable. Herein, a descriptor to elucidate the morphology effect is proposed by revealing the diffusion anisotropy in straight and sinusoidal channels of H-ZSM-5 zeolite for olefin catalytic cracking. A series of H-ZSM-5 zeolites with similar nano-sheet morphology were precisely synthesized in which only the length in c-axis varies. It is unexpectedly demonstrated that the catalytic activity and stability can be obviously improved by employing samples with longer length in c-axis. Combining time-resolved in-situ FT-IR spectroscopy with molecular dynamic simulations, we revealed that the difference in catalytic performance can be attributed to the intracrystalline diffusive propensity in different channels. This work not only provides a clear descriptor revealing morphology effect, but also offers deep insight into design of highly effective zeolite catalysts for olefin catalytic cracking.

show abstract

Theta-1 zeolite catalyst for increasing the yield of propene when cracking olefins and its potential integration with an olefin metathesis unit

Abstract: Theta-1 zeolite with secondary mesoporosity improves propene selectivity with respect to ZSM-5 for cracking of olefins.

Cited by 19 publications

References 53 publications

Selective Introduction of Acid Sites in Different Confined Positions in ZSM-5 and Its Catalytic Implications

Selective Introduction of Acid Sites in Different Confined Positions in ZSM-5 and Its Catalytic Implications

Theoretical investigation of the side-chain mechanism of the MTO process over H-SSZ-13 using DFT and ab initio calculations

Diffusion anisotropy descriptor revealing morphology effect of H-ZSM-5 zeolite for olefin catalytic cracking

Contact Info

Product

Resources

About