Effect of crystal size on butenes oligomerization over MFI catalysts

Попов, А. Г.; Павлов, В. С.; Ivanova, I. I.

doi:10.1016/j.jcat.2015.12.008

Cited by 60 publications

(30 citation statements)

References 34 publications

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“…In this case, the probability to form undesired bulky hydrocarbons would be mostly reduced and hardly blocked the channels of the zeolite. The positive effect of shorter diffusion paths would be even more important when converting light olefins, due to their higher potential for formation of larger products, which could improve diffusion rate [60][61][62].…”

Section: Schematic Illustration Of the Improved Diffusionmentioning

confidence: 99%

Improvement of the Catalytic Efficiency of Butene Oligomerization Using Alkali Metal Hydroxide-Modified Hierarchical ZSM-5 Catalysts

Zhang

et al. 2018

Catalysts

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Oligomerization of light olefin is an effective method to produce plentiful liquid fuels. However, oligomerization processes using microporous zeolites have severe problems due to steric hindrance. In this paper, oligomerization of butene using a series of new types of hierarchical HZSM-5 zeolite catalysts is studied. To obtain the modified HZSM-5 catalysts, HZSM-5 is treated with the same concentration of LiOH, NaOH, KOH, and CsOH aqueous solutions, respectively. It is demonstrated that the alkali treatment can effectively modify the acidity properties and hierarchical structure of the HZSM-5 catalyst, which is confirmed by X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Nitrogen Adsorption-desorption Measurements, Transmission Electron Microscopy Investigations (TEM), Ammonia Temperature-programmed Desorption Method (NH 3 -TPD), Pyridine FT-IR, and Thermogravimetric Analysis (TGA). The results show that hierarchical catalysts with interconnected open-mesopores, smaller crystal size, and suitable acidity can better prolong the catalyst lifetime during butene oligomerization. Particularly, the HZSM-5 catalysts treated with CsOH aqueous solution (ATHZ5-Cs) proved to be the most effective catalyst, resulting in approximately 99% conversion of butene and exhibiting C 8 + selectivity of 85% within 12 h. Thus, an appropriate hierarchical catalyst can satisfy the oligomerization process and has the potential to be used as a substitute for the commercial ZSM-5 catalyst.

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Section: Schematic Illustration Of the Improved Diffusionmentioning

confidence: 99%

Improvement of the Catalytic Efficiency of Butene Oligomerization Using Alkali Metal Hydroxide-Modified Hierarchical ZSM-5 Catalysts

Zhang

et al. 2018

Catalysts

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“…MZS‐0.4‐Cl possessed intermediate amount of B acid sites (the highest of Group 3; 138 μmol g −1 , Table ), besides mesoporosity. Brønsted acidity may favour olefin oligomerisation, although the acid sites accessibility seems particularly important for 1‐butene conversion. The PCA biplots suggested that mesoporosity and B acidity are inversely related (since these variables are located on opposite quadrants), which calls for a balance.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Conversion of 1‐butene over Modified Versions of Commercial ZSM‐5 to Produce Clean Fuels and Chemicals

et al. 2019

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The oligomerisation of light olefins, obtainable from fossil/renewable sources and refinery streams, is an attractive route to produce clean synthetic fuels and added‐value chemicals. ZSM‐5 is a type of catalyst used in commercial olefin oligomerisation processes. Using appropriate modification procedures, it was possible to prepare catalysts with improved performances. Various modified versions of commercially available ZSM‐5 were prepared and investigated for 1‐butene oligomerisation under high‐pressure, continuous‐flow operation (30 bar, 200 °C). Simple, up‐scalable top‐down strategies involving base‐acid treatments of ZSM‐5 led to catalysts possessing enlarged pores and the required acidity for converting 1‐butene to higher molar mass products. In targeting diesel type products, the modified catalysts led to up to 86 % butenes conversion, space time yield of 852 mg gcat−1 h−1 and mass ratio diesel:naphtha cuts of 2.2. Characterisation studies and multivariate/principal component analysis helped categorise the differently prepared catalysts, and gain insights into complex interplay of material properties influencing the catalytic reaction.

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“…As nano-sized ZSM-5 zeolites with shorter diffusion length favored the adsorption and desorption of reactants in the micropores compared with the micro-sized zeolite, the catalytic cracking activity increased with the decrease of crystal size [15,[98][99][100]. Tago et al [101] studied the catalytic performance of ZSM-5 zeolite with macro-size (2300 nm) and nano-size (90 nm) in naphthene cracking.…”

Section: Nano-sized Zsm-5 Zeolitementioning

confidence: 99%

“…They also studied the effect of crystal size of ZSM-5 zeolite on the rate-limiting step of the n-hexane cracking using the Thiele modulus, and they concluded that the cracking reaction could be proceed when the crystal size was in nano-scale [102]. Besides, ZSM-5 zeolite with short diffusion length facilitated the transport of BTEX (carbon precursors), thus preventing the formation of carbon deposition, which improved the catalytic stability [99,100,103,104]. The nano-sized ZSM-5 zeolite can be synthesized by hydrothermal method or bead milling method.…”

Section: Nano-sized Zsm-5 Zeolitementioning

confidence: 99%

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

Yang

Yan

2017

Catalysts

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ZSM-5 zeolite is widely used in catalytic cracking of hydrocarbon, but the conventional ZSM-5 zeolite deactivates quickly due to its simple microporous and long diffusion pathway. Many studies have been done to overcome these disadvantages recently. In this review, four main approaches for enhancing the catalytic performance, namely synthesis of ZSM-5 zeolite with special morphology, hierarchical ZSM-5 zeolite, nano-sized ZSM-5 zeolite and optimization of acid properties, are discussed. ZSM-5 with special morphology such as hollow, composite and nanosheet structure can effectively increase the diffusion efficiency and accessibility of acid sites, giving high catalytic activity. The accessibility of acid sites and diffusion efficiency can also be enhanced by introducing additional mesopores or macropores. By decreasing the crystal size to nanoscale, the diffusion length can be shortened. The catalytic activity increases and the amount of carbon deposition decreases with the decrease of crystal size. By regulating the acid properties of ZSM-5 with element or compound modification, the overreaction of reactants and formation of carbon deposition could be suppressed, thus enhancing the catalytic activity and light alkene selectivity. Besides, some future needs and perspectives of ZSM-5 with excellent cracking activity are addressed for researchers' consideration.

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Effect of crystal size on butenes oligomerization over MFI catalysts

Cited by 60 publications

References 34 publications

Improvement of the Catalytic Efficiency of Butene Oligomerization Using Alkali Metal Hydroxide-Modified Hierarchical ZSM-5 Catalysts

Improvement of the Catalytic Efficiency of Butene Oligomerization Using Alkali Metal Hydroxide-Modified Hierarchical ZSM-5 Catalysts

Catalytic Conversion of 1‐butene over Modified Versions of Commercial ZSM‐5 to Produce Clean Fuels and Chemicals

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

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