Reuse of Spent FCC Catalyst for Removing Trace Olefins from Aromatics

Pu, Xin; Luan, Jin-ning; Shi, Li

doi:10.5012/bkcs.2012.33.8.2642

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…The resource recovery process by solvent extraction process often causes detrimental effects on the structure of SC, which is not beneficial in the case of reusing, regeneration, and recycling of SC. Six XRD diffraction patterns in Fig 5 indicate that Al 2 O 3 support peaks are located at diffraction angles 2θ = 46.9° and 15.7° [ 50 – 52 ]. The characteristic peaks at 35°, 54.5°, 56°, and 68.5° are completely intact after solvent extraction with five solvents.…”

Section: Resultsmentioning

confidence: 99%

A facile method of treating spent catalysts via using solvent for recovering undamaged catalyst support

Abbas,

Jung

2024

PLoS ONE

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The process of washing and removing crude oil from spent catalysts is a serious issue in both catalyst regeneration and precious metals recovery. In this work, five different solvents with various polar and aromatic properties were chosen to evaluate their impact on the catalyst support structure and crude oil recovery from oil-contaminated spent catalysts. After the deoiling process, the spent catalyst was analyzed by scanning electron microscopy, X-ray diffraction (XRD), Fourier transform-infrared spectroscopy, elemental analyzer, contact angle measurement, gas chromatography-mass spectrometry, inductively coupled plasma-atomic emission spectroscopy, and Brunauer Emmet Teller (BET) method. Our findings demonstrate that p-xylene and kerosene are more effective in removing oil than other solvents. This is due to crude oil’s similar polarity and molecular nature with kerosene and p-xylene. Considering the economical reason, kerosene is a better choice for deoiling spent catalyst compared to p-xylene as it is more affordable than p-xylene. XRD data show that the structure of the catalyst support was unaltered by the solvent treatment process, while BET data reveals that the surface area and pore volume are significantly enhanced after the deoiling process. These results imply that deoiling is a very crucial step for the recycling, regeneration, and reuse of spent catalysts. Our work is significant in developing sustainable approaches for managing spent catalysts, and minimizing waste and environmental pollution.

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Section: Resultsmentioning

confidence: 99%

A facile method of treating spent catalysts via using solvent for recovering undamaged catalyst support

Abbas,

Jung

2024

PLoS ONE

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“…The unstable carbenium ion reacts with aromatic compounds by the alkylation reaction; this process eventually removes olefins (Figure ). , In order to evaluate the accuracy and reproducibility of the synthetic method and the catalyst test system, Al-pillared clay (50 wt % PVA) samples with the name Rx = 2–3 are synthesized through the same synthetic method and tested under the same operating conditions. The tests are repeated at least three times.…”

Section: Resultsmentioning

confidence: 99%

Effect of Poly(vinyl alcohol) on Catalytic Performance of Al-Pillared Clay in Alkylation of Aromatic Hydrocarbons with Olefins

Nouri

Tasviri

Zendehboudi

2023

Ind. Eng. Chem. Res.

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It is vital to design and synthesize efficient catalysts for removing olefins from aromatics and prolonging reaction time. The catalytic properties of pillared clay for olefin removal from aromatic compounds can be enhanced noticeably by grafting organic polymer molecules due to modification of the clay porosity in the pillaring reaction. In the present work, a series of catalysts are prepared by pillaring raw bentonite and acid-treated bentonite with aluminum and poly(vinyl alcohol) (PVA) intercalation. Prepared samples are evaluated in the olefin removal process and characterized by X-ray diffraction patterns (XRD), temperature-programmed desorption (TPD) of NH3, and nitrogen adsorption–desorption isotherms. The BET results reveal that the pillaring reaction in an aqueous solution of PVA increases the clay’s surface area to greater than 200 m2.g–1. The pore volume of alumina-pillared acid-activated clay (Al-PAAC) is enhanced from 0.278 to 0.321 and 0.416 cm3.g–1 at the PVA concentrations of 30 and 50 wt %, respectively. The samples modified with PVA, as a precursor in the pillaring reaction, show an enhanced catalytic activity compared to the other samples due to a higher number of active sites. The olefin conversion of the pillared sample remains above 50% in the presence of 50 wt % PVA for more than 26 h. Furthermore, PVA could facilitate the reactant’s access to the active acid sites in the interlayer of the pillared clay. The adsorption of aromatic compounds and olefins by the pillared samples follows the intraparticle diffusion kinetic model. In addition, the Langmuir model fits the adsorption isotherm data well.

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An efficient method for recycling spent residue cat-cracking catalysts (SRC) to prepare broadly-applicable mullite-based wear-resistant ceramics

Mohammadi

Salehi

Aghazadeh

et al. 2020

Applied Clay Science

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Reuse of Spent FCC Catalyst for Removing Trace Olefins from Aromatics

Cited by 4 publications

References 26 publications

A facile method of treating spent catalysts via using solvent for recovering undamaged catalyst support

A facile method of treating spent catalysts via using solvent for recovering undamaged catalyst support

Effect of Poly(vinyl alcohol) on Catalytic Performance of Al-Pillared Clay in Alkylation of Aromatic Hydrocarbons with Olefins

An efficient method for recycling spent residue cat-cracking catalysts (SRC) to prepare broadly-applicable mullite-based wear-resistant ceramics

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