Production of valuable chemicals through the catalytic pyrolysis of harmful oil sludge over metal-loaded HZSM-5 catalysts

Hakimian, Hanie; Valizadeh, Soheil; Kim, Young‐Min; Park, Young-Kwon

doi:10.1016/j.envres.2022.113911

Cited by 12 publications

(2 citation statements)

References 57 publications

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“…However, increasing the Ni load to 5wt.% caused a reduction in the surface area, which can be attributed to blockage of catalyst pores due to the higher quantity of the metal species [41]. The pore volume appears to increase with the incorporation of Ni, from 0.100 cc/g for HZSM-5, to 0.102 cc/g for 1wt.%Ni-HZSM-5, which is the highest value of the three.…”

Section: N2 Porosimetrymentioning

confidence: 91%

Analytical Fast Pyrolysis of P. Juliflora: A Thermal and Catalytic Study

Rapoo,

Singh,

Chong

et al. 2023

Preprint

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Section: N2 Porosimetrymentioning

confidence: 91%

Analytical Fast Pyrolysis of P. Juliflora: A Thermal and Catalytic Study

Rapoo,

Singh,

Chong

et al. 2023

Preprint

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“…Heavy crude oil and residual oil cracking processes for the production of olefns are currently semicommercial, which is mainly due to the lack of catalyst stability and a method of preventing coking trouble in the reactor [7][8][9]. Hakimian et al reported HZSM-5 for producing high chemicals from oil sludge [10]. Cheng and Huber studied HZSM-5 for furan conversion into aromatics and olefns [11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Micromesoporous Zeolite-Alumina Catalysts for Olefin Production from Heavy Crude Oil

Al-Samhan

Al-Fadhli

Al-Otaibi

et al. 2023

International Journal of Chemical Engineering

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Maximizing the production of high-value olefins from heavy crude oil is a crucial topic in the downstream refining industry. However, converting heavier fractions is a major challenge due to the small pore size of the zeolites. Therefore, this work aimed to develop extrudate zeolite catalysts posing adequate micromesoporous pore network and moderate acidity by combining microporous zeolite with the boehmite phase of alumina. These extruded zeolite-alumina catalysts are expected to allow sufficient diffusion of heavy fractions, thus leading to high cracking of heavy oil into valuable olefins. Different zeolite-alumina catalysts of varying alumina content ranging from 25 to 75% (AlZ-25, AlZ-50, and AlZ-75) were prepared in the laboratory to study the optimum zeolite-alumina ratios for maximum olefin production from heavy oil. The catalysts were characterized for their chemical and physical properties using nitrogen adsorption (N2 adsorption), X-ray diffraction (XRD), inductively coupled plasma (ICP) spectrometry, Fourier transform infrared (FT-IR) spectroscopy, and NH3 temperature programmed desorption (TPD). A gradual increase in the average pore diameter (APD) of the catalysts was observed due to the alumina ratio with a distinct range of acidity that is in the range of 125 to 375°C, and also the geometry of pores is not the same for all of the supports. Catalytic performance tests were conducted in a fixed-bed reactor at 450°C, 10 bar, and liquid hourly space velocity (LHSV) of 1 h−1. The results revealed that the prepared catalysts were thermally stable and effective in heavy oil conversion to olefins. Moreover, the selectivity of propylene was higher than that of ethylene (P/E) due to the modified textural and acidic properties of the catalysts. The results showed that the catalysts prepared with moderate acidity and adequate mesopores exhibited a considerable effect on the conversion of heavy crude oil into olefins. Hence, the acidity and mesoporosity of the catalysts play a vital role in determining the catalyst performance.

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