Catalytic pyrolysis of oil sludge using the nano alumina powder

Sajadi, Mahdi; Mokhtarani, Nader

doi:10.1016/j.energy.2023.126954

Cited by 7 publications

(6 citation statements)

References 38 publications

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“…However, the high concentration of Cu impregnation may also inhibit the catalytic pyrolysis reaction under high-temperature conditions because the high relative acid active sites cracked the long residue fraction into smaller hydrocarbon compounds and further attributed the secondary cracking reaction to a slight increase in the gaseous product yield. Moreover, excessive Cu-impregnated sFCC showed a lower content of both kerosene-like and diesel-like fractions because copper inhibited the catalytic activity in the microporous structure, resulting in the middle volatile hydrocarbon compounds from thermal degradation not successively passing through the textural structure of the parent catalyst and having difficulty reacting with the acidic active site. − ,− , Therefore, the product yield distribution of desirable products in both kerosene- and diesel-like fractions tended to decrease. It is obvious that the selectivity of diesel-like on all series of Cu-modified sFCC represented higher selectivity than that from the parent sFCC.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, too much catalyst loading may not be beneficial for the conversion of SLO/LDPE into liquid yield and its desirable product distribution. Furthermore, it may not be commercial to use a high percentage loading of the invaluable metal catalyst in the pyrolytic reaction. ,,, …”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, it may not be commercial to use a high percentage loading of the invaluable metal catalyst in the pyrolytic reaction. 2,10,31,35 The product distribution of liquid products by several catalyst loadings illustrated that the conversion of the long residue fraction into smaller hydrocarbon compounds showed that the diesel-likeness increased from 15.85 to 23.11 wt % as the catalyst loading increased from 3 to 10 wt %. The increased proportion of diesel-like compounds can be attributed to increased metal active sites that enhance the cleavage of carbon−carbon bonds, which also accelerates the β-scission and H-transfer reaction of long-chain hydrocarbon compounds into middle hydrocarbon compounds.…”

Section: Influence Of Catalyst Loading On the Product Yield Distributionmentioning

confidence: 99%

“…14,22−24 Furthermore, upgrading the coprocessing of SLO and LDPE is also a candidate process with some acid/basic heterogeneous catalysts to produce a diesel-like grade. In general, zeolites, especially fluid catalytic cracking catalysts (FCCs), are widely used as heterogeneous acid catalysts in oil refining industries [9][10][11]15,17 due to their textural properties, microporosity, thermal stability and acidity, resulting in the conversion of crude oil into commercialized fuels and liquified petroleum gas.…”

Section: Introductionmentioning

confidence: 99%

“…Noble metal acid catalysts are highly expensive and need regeneration after the reaction, while it is necessary to investigate an inexpensive alternative active catalyst that has a long lifetime and good catalytic performance for the production of pyrolysis oil from SLO. − Therefore, many researchers have also focused on the product distribution and further treatment to improve the physicochemical properties and fuel quality, ,,,, including the copyrolysis of feedstocks with high H/C material, such as waste polymer and less oxygenate composition. ,− Low-density polyethylene (LDPE) can be co-fed with SLO, enhancing the role of LDPE and its synergy of both thermal decomposition and further catalytic reaction, resulting in shortened hydrocarbon molecules and conversion into desirable pyrolysis oils when compared with the pyrolysis oil obtained from the pyrolysis of individual SLO. ,− Furthermore, upgrading the coprocessing of SLO and LDPE is also a candidate process with some acid/basic heterogeneous catalysts to produce a diesel-like grade. In general, zeolites, especially fluid catalytic cracking catalysts (FCCs), are widely used as heterogeneous acid catalysts in oil refining industries − ,, due to their textural properties, microporosity, thermal stability and acidity, resulting in the conversion of crude oil into commercialized fuels and liquified petroleum gas.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Copyrolysis of Used Waste Plastic and Lubricating Oil Using Cu-Modification of a Spent Fluid Catalytic Cracking Catalyst for Diesel-like Fuel Production

Charusiri,

Phowan,

Permpoonwiwat

et al. 2023

ACS Omega

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This work provided catalytic copyrolysis of spent lubricating oil (SLO) with waste low-density polyethylene (LDPE) using copper modification of a spent fluid catalytic cracking (sFCC) catalyst to produce diesel-like fuels in a microbatch reactor, which will lead to effective waste management, ensure sustainability, and serve as an alternative energy source. The effects of LDPE blended with SLO, temperature, reaction time, and catalyst loading using an inert nitrogen atmosphere were investigated on the yields and distributions of copyrolyzed oil, while metal modification of the sFCC was prepared and used to investigate the catalytic activity. The temperature and time of reaction played an important role in the gaseous contribution to the pyrolysis of SLO. The addition of the LDPE ratio in the catalytic copyrolysis, including Cu loading on a spent FCC template, also enhanced the acidity and was responsible for the catalytic activity, which could improve the product distribution and chemical compounds in a range of diesel-like fuels. It was shown that the pyrolyzed oil was in the range of C7–C26 with a maximum diesel-like fraction of 23.11 ± 2.88 wt % compared with the catalytic pyrolysis of SLO alone, which contained a diesel-like fraction of only 12.45 ± 1.92 wt %. It was noticed that the acid active site of the catalyst resulted in a carbon–carbon bond cleavage and further secondary reaction, leading to the conversion of the long residue fraction into a light oil product. In addition, the LDPE ratio in the catalytic copyrolysis could improve the product distribution and chemical compounds in a range of diesel-like compounds, as confirmed by the GC/MS analysis. Catalytic copyrolysis oil of the optimal process condition (0.7:0.3 mass molar of SLO/LDPE, 450 °C, 60 min, 3 wt % Cu-sFCC, and 10 wt % catalyst loading) mainly contains light hydrocarbons in the C7–C19 range. Accordingly, both the product selectivity and the conversion of the long residue to the diesel-like fraction were nearly stable (59.01 ± 1.36%) during the catalyst reusability test from one to three cycles without regeneration and significantly decreased after the fifth cycle. This is an indication that the copyrolysis enhanced the conversion of SLO by LPDE blended into smaller hydrocarbon compounds, and the catalytic activity therefore showed a major tendency toward the formation of diesel-like fractions (C8–C18).

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