Influence of the level of dealumination on the selective adsorption of olefins and paraffins and its implication on hydrogen transfer reactions during catalytic cracking on USY zeolites

Corma, Avelino; Faraldos, Marisol; Mifsud, A.

doi:10.1016/s0166-9834(00)83268-6

Cited by 67 publications

(31 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Specifically, aromatization is catalyzed by Brönsted acid sites during the hydrogen transfer in paraffins and cycloalkanes, generating intermediate compounds such as olefins. 28 The low selectivity for aromatic compounds agrees with the literature data; Lukyanov observed that HZSM-5 had a decreased ability to catalyze hydrogen transfer reactions that proceed through a bimolecular transition state while using sterically encumbered materials. 29 To aid in understanding the hydrocarbon selectivity during pyrolysis, Figure 6 shows the selectivities for each carbon atom number.…”

Section: Figure 3 Micrographs Of Zeolites Hzsm-5(a) and Hzsm-5-at (Bsupporting

confidence: 88%

Use of a Low-Cost Template-Free ZSM-5 for Atmospheric Petroleum Residue Pyrolysis

et al. 2016

View full text Add to dashboard Cite

To understand the physicochemical properties and catalytic activity during the pyrolysis of atmospheric petroleum residue, a templatefree ZSM-5 zeolite was synthesized using a direct method without additional seeds or an organic structure director and compared with conventionally synthesized ZSM-5. The crystallinities of the two zeolites were evaluated by XRD and FTIR and were quite similar; however, structural analyses using SEM and argon physisorption revealed that the zeolites diverged in particle diameter and in the external surface area of the micropores. The synthesis procedure without a template incorporated additional aluminum into the crystalline network, according to ICP-AES and TPD NH 3 experiments. The catalytic pyrolysis performed over the template-free ZSM-5 generated results comparable to those for pyrolysis performed over the conventional ZSM-5 according to its hydrocarbon distribution. The selectivity to aromatics compounds was exactly the same for both ZSM-5 zeolites, and these values stand out compared to thermal pyrolysis. The template-free ZSM-5 produced 20% of light hydrocarbons (C 4 -C 6 ), where such compounds are olefins and paraffins of great interest to the petrochemical industry. Therefore, template-free ZSM-5 is promising for industrial use due to its lowered synthesis time, low-cost and significant distribution to light hydrocarbons.

show abstract

Section: Figure 3 Micrographs Of Zeolites Hzsm-5(a) and Hzsm-5-at (Bsupporting

confidence: 88%

Use of a Low-Cost Template-Free ZSM-5 for Atmospheric Petroleum Residue Pyrolysis

et al. 2016

View full text Add to dashboard Cite

show abstract

“…This concept is supported by the literature which has shown that there are more parameters than unit cell size which affect hydrogen-transfer. Increase of hydrogen-transfer at constant unit cell size as a function of mesoporosity has been shown by Corma et al [30]. In their work the performance of hydrothermally and chemically (SiCl 4 ) dealuminated zeolites were compared.…”

Section: Variation Of Unit Cell Size By Rare Earth Concentration; Commentioning

confidence: 89%

Impact of rare earth concentration and matrix modification in FCC catalysts on their catalytic performance in a wide array of operational parameters

Wallenstein

Schäfer

Harding

2015

Applied Catalysis A: General

View full text Add to dashboard Cite

“…The relative activity of FCC catalysts for generating secondary reactions can be estimated using the hydrogen transfer index (HTI) for catalysts tested under constant conditions with the same feed [1,8,27,36,60,91,107]. Catalysts with lower HTIs generate fewer secondary reactions, preserving a greater quantity of the gasoline boiling range olefins, which can be subsequently cracked to lighter olefins.…”

Section: Effect Of Hydrogen Transfer Indexmentioning

confidence: 99%

Maximizing propylene production via FCC technology

2015

View full text Add to dashboard Cite

This review looks at the main processes available for the production of light olefins with a focus on maximizing the production of propylene. Maximization of propylene production has become the focus of most refineries because it is in high demand and there is a supply shortage from modern steam crackers, which now produce relatively less propylene. The flexibility of the fluid catalytic cracking (FCC) to various reaction conditions makes it possible as one of the means to close the gap between supply and demand. The appropriate modification of the FCC process is accomplished by the synergistic integration of the catalyst, temperature, reaction-residence time, coke make, and hydrocarbon partial pressure. The main constraints for maximum propylene yield are based on having a suitable catalyst, suitable reactor configuration and reaction conditions.

show abstract

Influence of the level of dealumination on the selective adsorption of olefins and paraffins and its implication on hydrogen transfer reactions during catalytic cracking on USY zeolites

Cited by 67 publications

References 3 publications

Use of a Low-Cost Template-Free ZSM-5 for Atmospheric Petroleum Residue Pyrolysis

Use of a Low-Cost Template-Free ZSM-5 for Atmospheric Petroleum Residue Pyrolysis

Impact of rare earth concentration and matrix modification in FCC catalysts on their catalytic performance in a wide array of operational parameters

Maximizing propylene production via FCC technology

Contact Info

Product

Resources

About