Preparation of mesoporous Beta zeolite by fluoride treatment in liquid phase. Textural, acid and catalytic properties

Suárez, Natalia; Pérez‐Pariente, Joaquín; Márquez‐Álvarez, Carlos; Grande-Casas, Marisol; Mayoral, Álvaro; Moreno, Andrés

doi:10.1016/j.micromeso.2019.04.049

Cited by 22 publications

(13 citation statements)

References 39 publications

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“…For this reason, many researchers have developed the heterogeneous acid catalysts containing the high Brønsted acid site and/or Lewis acid site to promote the cracking process by enhancing the number of catalyst acid sites. Previously, the enhancement of the catalyst acid sites could be carried out by metal atom modification − and treatment using acid chemicals. − They reported that the modification of the catalysts acidity using metal impregnation on Y zeolite could increase the Lewis acid site amount because of the presence of unpaired electrons in the metals . However, the metal impregnation could decrease the Brønsted acid site present in the catalysts because of the ion exchange of acidic proton with metals during the impregnation process .…”

Section: Introductionmentioning

confidence: 99%

Enhancing Brønsted and Lewis Acid Sites of the Utilized Spent RFCC Catalyst Waste for the Continuous Cracking Process of Palm Oil to Biofuels

Istadi

Riyanto

Buchori

et al. 2020

Ind. Eng. Chem. Res.

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Catalyst waste from the residue fluid catalytic cracking (RFCC) plant process can still be utilized to catalyze the catalytic cracking of palm oil to fuels. However, we should regenerate the active sites of the catalyst waste. This paper focuses on enhancement of Brønsted and Lewis acid sites on the spent RFCC catalyst waste through various acid treatments in order to regenerate its catalyst active sites. In order to regenerate the Brønsted and the Lewis acid sites as active sites in the palm oil catalytic cracking, the spent RFCC catalyst was treated by citric acid, sulfuric acid, and mixture of both acids. The catalysts were characterized by X-ray fluorescence, X-ray diffraction, Brunauer–Emmett–Teller-Barrett–Joyner–Halenda, and pyridine-FTIR analysis. The modified catalyst performance was tested over a fixed bed reactor for the catalytic cracking process of palm oil to liquid fuels. It was found that the acid treatment on the spent RFCC catalyst can increase surface area, pore volume, and Brønsted to Lewis acid site ratio of catalysts. The Brønsted acid sites of the spent RFCC catalyst strongly increase by the treatment using sulfuric acid, which is because of the proton transfer from acid to catalyst and because of the formation of sulfate groups (HOSO3−) in the catalysts. It was found that the Brønsted acid site leads to the formation of long-chain hydrocarbon, while the Lewis acid site pronounces the formation of short-chain hydrocarbon and coke. Moreover, the total acidity and the Lewis acid site amount on the catalyst have roles in the formation of hydrocarbon fraction in the liquid product.

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Section: Introductionmentioning

confidence: 99%

Enhancing Brønsted and Lewis Acid Sites of the Utilized Spent RFCC Catalyst Waste for the Continuous Cracking Process of Palm Oil to Biofuels

Istadi

Riyanto

Buchori

et al. 2020

Ind. Eng. Chem. Res.

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“…[48,49] Thus, the deactivation is slower, with the sample having a higher external surface due to introduced mesopores Previous studies of NH 4 F or HF buffered with NH 4 F etching focused on medium-pore (10MR) zeolites like MFI and FER and large-pore (12MR) zeolites like FAU, LTL, MOR, and Beta. [42,[50][51][52][53] Compared with previous studies, the dissolution of the small-pore SSZ-13 shows some differences. For instance, Qin et al also used 40 w/% NH 4 F solutions to etch ZSM-5 upon similar experimental conditions.…”

Section: Discussionmentioning

confidence: 73%

Preparation of hierarchical SSZ-13 by NH4F etching

Babić

Koneti

Moldovan

et al. 2021

Microporous and Mesoporous Materials

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“…The HF/ NH 4 F treatment resulted in a higher Brønsted/Lewis acid sites ratio, which proved to cause a lower activity in the isomerization/disproportionation reaction of m-xylene. [334] Comparable to Suárez et al, Venkatesha et al also investigated the influence of the concentration of the dealumination agent, however, in this work, PDSA was used. A concentration between 0.1 and 1 m was used during the synthesis of hierarchical *BEA zeolite, which was used for the condensation of glycerol with acetone to form glycerol acetals.…”

Section: Betamentioning

confidence: 99%

“…The HF/NH 4 F treatment resulted in a higher Brønsted/Lewis acid sites ratio, which proved to cause a lower activity in the isomerization/disproportionation reaction of m ‐xylene. [ 334 ]…”

Section: Synthesis Of Hierarchical 12‐mr Zeolitesmentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

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Zeolites are highly crystalline aluminosilicates with welldefined pores that are constructed of SiO 2 and AlO 4 tetrahedra. These tetrahedra can be linked together in different unique ways to form various materials with a specific topology. [1] According to the International Zeolite Association (IZA), more than 250 different topologies, which are all assigned with a three-letter code, have been identified. [2] The micropores in zeolites are typically constructed from 8, 10, or 12 tetrahedral atoms

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Preparation of mesoporous Beta zeolite by fluoride treatment in liquid phase. Textural, acid and catalytic properties

Cited by 22 publications

References 39 publications

Enhancing Brønsted and Lewis Acid Sites of the Utilized Spent RFCC Catalyst Waste for the Continuous Cracking Process of Palm Oil to Biofuels

Enhancing Brønsted and Lewis Acid Sites of the Utilized Spent RFCC Catalyst Waste for the Continuous Cracking Process of Palm Oil to Biofuels

Preparation of hierarchical SSZ-13 by NH4F etching

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

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