Effect of alkali metal ion modification on the catalytic performance of nano-HZSM-5 zeolite in butene cracking

Xu, Ran; Liu, Jiaxu; Liang, Cuicui; Jia, Wenhao; Li, Fu-fen; Guo, Hongchen

doi:10.1016/s1872-5813(11)60029-7

Cited by 19 publications

(10 citation statements)

References 9 publications

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“…Up to 0.31 (g catalyst ·h) (mol C ) −1 , butene conversion and propylene yield sharply increase, whereas these reaction indices slightly vary for higher values of space time (Figure a). This result is consistent with the results reported in the literature for the cracking of 1-butene, , which evidence that propylene selective formation is associated with a low conversion. It should be pointed out that propylene selectivity remains constant at a high value (∼50%) up to a conversion of 60% (Figure b).…”

Section: Resultssupporting

confidence: 93%

Intensifying Propylene Production by 1-Butene Transformation on a K Modified HZSM-5 Zeolite-Catalyst

Epelde

Gayubo

Olazar

et al. 2014

Ind. Eng. Chem. Res.

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The effect operating conditions have in the selective transformation of 1-butene into propylene has been studied on a catalyst of HZSM-5 zeolite (SiO2/Al2O3 = 280) modified with 1 wt % K (of moderate acid strength) and agglomerated with bentonite and alumina. The kinetic runs have been performed in a fixed bed reactor under the following operating conditions: 400–600 °C; space time, up to 1.6 (gcatalyst·h) (molC)−1; and butene partial pressure, 0.375–1.35 bar. The kinetic performance has been evaluated at zero time and throughout time on stream in order to find the suitable conditions to maximize propylene yield and selectivity and minimize deactivation by coke. A region of optimum propylene yield (>30%) and propylene selectivity (>50%) has been established for temperatures above 500 °C and space time values depending on the reaction temperature. Furthermore, cofeeding 50% of inert gas is highly recommended in order to attenuate coke deactivation.

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Section: Resultssupporting

confidence: 93%

Intensifying Propylene Production by 1-Butene Transformation on a K Modified HZSM-5 Zeolite-Catalyst

Epelde

Gayubo

Olazar

et al. 2014

Ind. Eng. Chem. Res.

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“… ~ 15f. 48 2014 H-ZSM-5 (Si/Al 2 = 23) Temperature = 500 °C GHSV = 900 h −1 (C 4 H 8 :N 2 = 1:5) 99.90 g 0.40 g 39 2014 H-ZSM-5 (Si/Al 2 = 80) Temperature = 500 °C GHSV = 900 h −1 (C 4 H 8 :N 2 = 1:5) 96.20 g 10.20 g 39 2014 H-ZSM-5 (Si/Al 2 = 280) Temperature = 500 °C GHSV = 900 h −1 (C 4 H 8 :N 2 = 1:5) 88.80 g 20.25 g 39 2014 Silicalite-1 Temperature = 500 °C GHSV = 900 h −1 (C 4 H 8 :N 2 = 1:5) 66.70 g 20.08 g 39 2015 H-ZSM-5 (Si/Al 2 = 50) Temperature = 550 °C, WHSV = 5 h −1 (Pure 1-butene (> 99.5%)) ~ 90 h ~ 18 h 49 2017 H-ZSM-5 (SiO 2 /Al 2 O 3 = 30) Temperature = 500 °C, Space time = 0.32 g catalyst*h*(mol C ) −1 (90 vol% 1-butene in He) ~ 98 i ~ 15 i 50 ...…”

Section: Discussionmentioning

confidence: 99%

Role of Al in Na-ZSM-5 zeolite structure on catalyst stability in butene cracking reaction

Auepattana-aumrung

Márquez

Wannakao

et al. 2020

Sci Rep

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The Na-ZSM-5 catalysts (SiO 2 /Al 2 o 3 molar ratio = 20, 35, and 50) were prepared by rapid crystallization method to investigate their performance in butene cracking reaction. The XRD, XRF, NH 3-TPD, FT-IR, TPO, UV-Vis, and 1 H, 27 Al, 29 Si MAS NMR techniques were used to identify the physical and chemical properties of Na-ZSM-5 catalysts. The silanol group (Si-OH) was the main acid site of Na-ZSM-5, and it was proposed to be the active site for the butene cracking reaction. The butene conversion and coke formation were associated with the abundance of silanol groups over the Na-ZSM-5 catalyst. The dealumination, resulting in the deformation of tetrahedral framework aluminum species was a key factor for Na-ZSM-5 catalyst deactivation, because of the Si-O-Al bond breaking and formation of Si-O-Si bond. The stability of the Si-O-Al bond was linked to the molar number of sodium since the Na atom interacts with the Si-O-Al bond to form Si-ONa-Al structure, which enhances the stability of the silanol group. Therefore, the Si-ONa-Al in zeolite framework was an essential structure to retain the catalyst stability during the reaction. The Na-ZSM-5 with the lowest SiO 2 /Al 2 o 3 molar ratio showed the best performance in this study resulting the highest propylene yield and catalyst stability.

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“…To improve the propylene selectivity obtained in the aforementioned processes it is helpful to develop a kinetic model for light olefin interconversion, which takes place over acid catalysts by the classical mechanism of oligomerization-cracking. , This interconversion gives way to a huge variety of reactions such as dehydrogenation-aromatization and hydrogen transfer reactions, thus obtaining hydrocarbons from methane to aromatics. This complex reaction mechanism depends on catalyst properties (shape selectivity and acidity) and on operating conditions. − …”

Section: Introductionmentioning

confidence: 99%

Kinetic Model for the Transformation of 1-Butene on a K-Modified HZSM-5 Catalyst

Epelde

Aguayo

Olazar

et al. 2014

Ind. Eng. Chem. Res.

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A kinetic model of eight lumps (methane, ethylene, propylene, C 2−3 paraffins, butanes, C 5+ hydrocarbons (aliphatic hydrocarbons of five or more carbon atoms), and aromatics (benzene, toluene, and xylenes, BTX)) has been established for the transformation of 1-butene over a 1 wt % K modified HZSM-5 zeolite (SiO 2 /Al 2 O 3 = 280) catalyst (of moderate acidity). The kinetic model allows quantifying product distribution at zero time on stream, and particularly propylene production, which has an increasing demand in petrochemical industry. The experimental data have been obtained in an isothermal fixed-bed reactor in the 400−600 °C range and under a wide range of experimental conditions: space time up to 1.6 (g catalyst h) (mol CH2 ) −1 and 1-butene partial pressure between 0.375 and 1.35 bar. It has been proven that a simplified kinetic model of five lumps (ethylene, propylene, butenes, C 1−4 paraffins and C 5+ hydrocarbons (aliphatics and aromatics)) is also suitable. Both models predict a product distribution that fits the experimental results in the range of operating conditions studied.

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Effect of alkali metal ion modification on the catalytic performance of nano-HZSM-5 zeolite in butene cracking

Cited by 19 publications

References 9 publications

Intensifying Propylene Production by 1-Butene Transformation on a K Modified HZSM-5 Zeolite-Catalyst

Intensifying Propylene Production by 1-Butene Transformation on a K Modified HZSM-5 Zeolite-Catalyst

Role of Al in Na-ZSM-5 zeolite structure on catalyst stability in butene cracking reaction

Kinetic Model for the Transformation of 1-Butene on a K-Modified HZSM-5 Catalyst

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