Influence of USY zeolite recrystallization on physicochemical properties and catalytic performance of NiMo/USY-Al2O3 hydrocracking catalysts

Казаков, М. О.; Надеина, К.А.; Данилова, И. Г.; Дик, П. П.; Климов, О. В.; Pereyma, V. Yu.; Paukshtis, E. A.; Golubev, I.S.; Prosvirin, Igor P.; Dobryakova, I. V.; Knyazeva, E. E.; Иванова, И. И.; Носков, А. С.

doi:10.1016/j.cattod.2019.01.003

Cited by 47 publications

(15 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[25,26] In the hydrocracking of nhexadecane, the comparison of mesoporous FAU-Y with a set of aluminated mesoporous silicas [27] showed that the catalytic activity relates linearly to the number of strong BrØnsted acid sites, while selectivity, more precisely the yield in isomerization products, scaled directly with the mesopore volume of the catalyst. The number of strong BrØnsted acid sites can be adjusted by tuning the synthesis conditions [28,29] and appeared to be correlated to the micropore volume of the mesoporous zeolite. [10] The influence of the micro-/and mesopore surface areas in mesoporous zeolites in catalysis and adsorption is seldom discussed.…”

Section: Introductionmentioning

confidence: 99%

Determination of Microporous and Mesoporous Surface Areas and Volumes of Mesoporous Zeolites by Corrected t‐Plot Analysis

et al. 2022

View full text Add to dashboard Cite

Zeolites are well-known microporous catalysts involved in many industrial applications. Their microporosity yet impedes diffusion of bulky molecules. To overcome this drawback, zeolites with hierarchical bimodal porosity, e. g. micropores and mesopores, are developed. In this context, it is important to develop/use methods able to evaluate accurately the textural properties of mesoporous zeolites. t-Plot can be in theory used for determining the micro-and mesopore surface areas and pore volumes. However, classical t-plot analysis overestimates the mesopore surface areas and underestimates the micropore volumes for hierarchical micro-/mesoporous materials. Measurements performed with mechanical mixtures of FAU-Y and MCM-41 allows to provide corrections, which are up to date limited to mesoporous FAU-Y. The present work describes specific corrections of the t-plot for a broader series of zeolites including MFI, *BEA and MOR, based on a set of mechanical mixtures of zeolites and MCM-41. Minor correction factors are required for MOR, whilst for MFI and *BEA similar corrections as for the FAU-Y are inferred for the micropore volume. As far as the surface area is concerned higher correction factors are required for MFI compared to *BEA. This corrected t-plot analysis is applied to characterize a great variety of mesoporous zeolites prepared by micelle-templating.

show abstract

Section: Introductionmentioning

confidence: 99%

Determination of Microporous and Mesoporous Surface Areas and Volumes of Mesoporous Zeolites by Corrected t‐Plot Analysis

et al. 2022

View full text Add to dashboard Cite

show abstract

“…It has already been shown that especially hierarchical mesoporous zeolites are very promising catalysts in hydrocracking of hexadecane and with increased mesoporosity the product distribution in hydrocracking of hexadecane can be increased [3]. Hydrocracking processes are performed industrially in fixed bed reactors [4]. A current trend in fine chemicals industry is to switch from batch to continuous operation.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Measurements of Hydrocarbons in Zeolites with Pulse-Field Gradient Nuclear Magnetic Resonance Spectroscopy

Живонитко

Vajglová

Mäki‐Arvela

et al. 2021

Russ. J. Phys. Chem.

View full text Add to dashboard Cite

Pulse field gradient NMR technique was used to determine self-diffusivity of heptane and pentadecane at room temperature for microporous catalysts, used both as powders and shaped with a binder extrudates. The results showed that diffusivities increased with increasing specific surface area, micro-and mesopore volume of the studied catalysts. The presence of Bindzil binder together with H-Beta-25 decreased hydrocarbon diffusivities. Self-diffusivities of heptane and pentadecane were smaller for extrudates than for the powder catalysts. The detailed information about mass transfer limitations is needed to further process optimization since effective diffusivity is directly correlated with self-diffusion coefficients. The estimates of the ratio of porosity and tortuosity were also determined. The diffusion measurements with relatively long observation times Δ (20 up to 1000 ms) and fully immersed catalysts in pentadecane revealed that a small portion of sites exhibits very small diffusivities in H-Beta-25-Bindzil extrudates, which is correlated with a low ratio of mesopore to micropore volumes of this material.

show abstract

“…44,45 Previous studies with NiMoS on modi-ed or mesoporous USY have been explored for hydrogenation, hydrocracking, and ring opening reactions for heavy vacuum gas oil (HVGO)/light cycle oil (LCO). [46][47][48][49] The morphologies of the MoS 2 phase, as well as the vicinity and the strength of the acid sites are vital for such upgrading. Hydrogen spillover and better metal (Pd) dispersion on 20% HY (Si/Al ¼ 2.3) and Al 2 O 3 were reported to be benecial for high phenol HDO.…”

Section: Introductionmentioning

confidence: 99%

NiMoS on alumina-USY zeolites for hydrotreating lignin dimers: effect of support acidity and cleavage of C–C bonds

Salam

Arora

Ojagh

et al. 2020

Sustainable Energy Fuels

View full text Add to dashboard Cite

show abstract

Influence of USY zeolite recrystallization on physicochemical properties and catalytic performance of NiMo/USY-Al2O3 hydrocracking catalysts

Cited by 47 publications

References 63 publications

Determination of Microporous and Mesoporous Surface Areas and Volumes of Mesoporous Zeolites by Corrected t‐Plot Analysis

Determination of Microporous and Mesoporous Surface Areas and Volumes of Mesoporous Zeolites by Corrected t‐Plot Analysis

Diffusion Measurements of Hydrocarbons in Zeolites with Pulse-Field Gradient Nuclear Magnetic Resonance Spectroscopy

NiMoS on alumina-USY zeolites for hydrotreating lignin dimers: effect of support acidity and cleavage of C–C bonds

Contact Info

Product

Resources

About