Regeneration of Hydrotreating and FCC Catalysts

Wai, CM; Frye, JG; Fulton, JL; Bowman, LE; Silva, LJ; Ma, Guoyi

doi:10.2172/12208

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…One of the solutions is the addition of Sb to from Ni-Sb alloys, Ni x Sb y O z , to inhibit the strong dehydrogenation activity of Ni and increase the yield of gasoline (Bohmer et al, 1990), so Sb is in high content. Wai et al (1999) also confirmed that the concentration of V, Ni, and Sb gets significantly increased from 2-33 ppm to 1,326-3,930 ppm when a FCC catalyst gets deactivated in an unit. Apart from the spent FCC samples, the raw material aggregates (gravel and sand) and cement also brought in a high level of Mn and Cr in the product.…”

Section: Determination Of Characteristic Pollutants Of Cn-brickssupporting

confidence: 61%

Utilization of Spent FCC Catalyst as Fine Aggregate in Non-sintered Brick: Alkali Activation and Environmental Risk Assessment

et al. 2021

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This study focuses on the recycling of a spent fluid catalytic cracking (FCC) catalyst to produce catalyst-based non-sintered bricks (CN-bricks) for the recovery of its aluminosilicate components and the solidification of heavy metals. The effects of the content of cement (10–20%), the proportion of FCC (10–40%), and the type of an activator (NaOH/Na2SiO3/Na2SO4) on the performance of a CN-brick were investigated in terms of the mechanical strength and leaching behavior. The results show that an optimal binder system of 20% cement + Na2SO4 could promote the compressive strength up to 42.3 MPa; the proportion of an optimal spent FCC catalyst of 20% could achieve the lowest porosity and water absorption. The microscopic mechanism of a cementitious process was analyzed by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM), proving that C-S-H and ettringite (AFt) are the two main hydration products of a CN-brick. Na2SO4 is superior to NaOH or Na2SiO3 as an activator since Na2SO4 takes advantage of the aluminum-rich property of a spent FCC catalyst and specifically promote the formation of a needle-like AFt. Quantitative environmental risk assessment for the utilization of a CN-brick on roads was carried out based on the leaching test of a toxicity characteristic leaching procedure (TCLP), NEN 7371 maximum availability test, and the hazard Index (HI) identification, and a final HI 0.0045 (<1.0) indicates an acceptable risk for environment and nearby residents as CN-bricks are utilized on roads for 30 years.

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Section: Determination Of Characteristic Pollutants Of Cn-brickssupporting

confidence: 61%

Utilization of Spent FCC Catalyst as Fine Aggregate in Non-sintered Brick: Alkali Activation and Environmental Risk Assessment

et al. 2021

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“…Moreover, the porous Y-type molecular sieve structure of FCC spent catalysts possesses a certain adsorption capacity. Hence, some studies [26][27][28] have proposed the substitution of spent FCC catalysts as fillers in asphalt mixtures, instead of mineral powder. Consequently, the utilization of spent FCC catalysts in asphalt mixtures can partially enhance the road performance of asphalt mixes.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Rheological Properties of Asphalt Mortar Modified with Spent FCC Catalysts

Wang,

Kong,

2023

Applied Sciences

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Spent fluid catalytic cracking catalysts (S-FCC-Cs) constitutes a fraction of the hazardous solid waste generated in the petrochemical industry. The resource application of S-FCC-Cs remains a challenge. This study aims to explore utilizing S-FCC-Cs in asphalt mortar as a means to enhance resource utilization. Five different S-FCC catalysts were used as substitutes for mineral powder in the asphalt slurry at varying proportions. The high-temperature rheology of the resulting spent FCC catalyst-modified asphalt slurry was analyzed using temperature scanning tests and multiple stress creep recovery (MSCR) tests conducted at different temperatures and substitution doping levels. As the proportion of alternative doping increased, both the phase angle and irrecoverable creep flexibility decreased, while the absolute values of the rutting factor, deformation recovery rate, and irrecoverable creep flexibility difference increased. Moreover, as the temperature rose, the phase angle increased while the rutting factor decreased. The inclusion of an alternative admixture significantly improved the high-temperature performance of the asphalt mastic. This improvement was attributed to several factors, including the increase in the elastic component, enhanced deformation resistance, and improved deformation recovery. While the high-temperature performance of spent FCC catalyst-modified asphalt mastic gradually declined with increasing test temperature, all performance indices remained superior to those of limestone mineral powder asphalt mastic. In addition, the asphalt mortar modified by S-FCC-C JX with a surface area and hydrophilic coefficient of 105 m2/g and 1.026, respectively, exhibited the best rutting resistance and resilience performances among the five mortars, suggesting that the two factors co-affected the high-temperature rheological properties of S-FCC-C asphalt mortar. Considering stress sensitivity, it is more advantageous in improving the high-temperature deformation resistance of asphalt slurry at the JX dosage of 20%. These research findings offer valuable guidance for the application of S-FCC catalysts in asphalt pavement.

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Fouling During Catalytic Cracking

Speight¹

2015

Fouling in Refineries

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Regeneration of Hydrotreating and FCC Catalysts

Cited by 4 publications

References 13 publications

Utilization of Spent FCC Catalyst as Fine Aggregate in Non-sintered Brick: Alkali Activation and Environmental Risk Assessment

Utilization of Spent FCC Catalyst as Fine Aggregate in Non-sintered Brick: Alkali Activation and Environmental Risk Assessment

High-Temperature Rheological Properties of Asphalt Mortar Modified with Spent FCC Catalysts

Fouling During Catalytic Cracking

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