Early stage deactivation of heavy crude oil hydroprocessing catalysts

Maity, Samir; Blanco, Élodie; Ancheyta, Jorge; Alonso, Fernando; Fukuyama, Hidetsugu

doi:10.1016/j.fuel.2011.11.017

Cited by 64 publications

(47 citation statements)

References 20 publications

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“…However, CoMo/CNT catalysts tested in the HDS of VR showed slightly lower activities than a CoMo/Al 2 O 3 catalyst [21]. No studies on the HDM properties of CNT-or CNF-supported catalysts were found for comparison, although it has been reported that the use of a CoMo catalyst supported on AC led to lower HDM and HDS activity than the corresponding catalyst supported on Al 2 O 3 [52]. Overall, good results were obtained in this work when processing a VR with high metal content, compared to the quoted literature which used LGO or a Maya crude with lower heteroatom content.…”

Section: Heteroatom Removalmentioning

confidence: 99%

Carbon nanofibres coated with Ni decorated MoS2 nanosheets as catalyst for vacuum residue hydroprocessing

Pinilla

Purón

Torres

et al. 2014

Applied Catalysis B: Environmental

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Catalysts based on functionalised carbon nanofibers (FCNF) coated with Ni-decorated MoS 2 nanosheets were obtained by direct decomposition of ammonium thiomolybdate and nickel nitrate impregnated on the FCNF under controlled temperature conditions in inert atmosphere. The catalysts were characterised by X-ray Diffraction (XRD), N 2 adsorption, Raman spectroscopy, temperature programmed reduction of sulfur species (TPR-S), NH 3 temperature programmed desorption (NH 3 -TPD) and transmission electron microscopy (TEM). Decomposition temperature was found to have a paramount importance in the formation of uniform MoS 2 slabs, as revealed by the TEM study: at 600 °C, non-uniform covering of the carbon nanofiber (CNF) was observed Higher asphaltene conversions were obtained for the CNF-supported catalysts prepared at 450 °C, which overperformed the Al 2 O 3 -supported benchmark catalyst. However, the catalytic performance in hydrodesulfurisation and hydrodemetallisation of the CNFbased catalysts was slightly lower than that of the benchmark catalyst.

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Section: Heteroatom Removalmentioning

confidence: 99%

Carbon nanofibres coated with Ni decorated MoS2 nanosheets as catalyst for vacuum residue hydroprocessing

Pinilla

Purón

Torres

et al. 2014

Applied Catalysis B: Environmental

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“…It indicates that the coke is formed by MoSbF catalyst is soft in nature whereas the coke formed by the catalyst H 3 PW is the hardest. The hardness property of a coke produced during hydrotreating reaction has been investigated in detailed by Beagon et al [29] and Maity et al [4,21]. As mentioned above that H 3 PW catalyst is comparatively effective for deep residue cracking and it may also lead to deep polymerization reaction for the formation of coke.…”

Section: Characterization Of Cokementioning

confidence: 99%

“…In a conventional supported catalyst, Lewis acid sites are used. In a typical catalyst system, metals like Mo, W, Ni, and Co are impregnated on acidic support like alumina; alumina based mixed oxide, modified zeolite and other support having acid sites [2][3][4][5]. However these supported catalysts are deactivated rapidly due to pore plugging by metal, and coke.…”

Section: Introductionmentioning

confidence: 99%

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Slurry Phase Hydrocracking of Residue by Phosphomolybdic and Phosphotungstic Acids

Prajapati¹,

Kohli²

2016

J Pet Environ Biotechnol

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Slurry phase hydrocracking of vacuum residue was studied on heteropoly acids and on super acid. In this regards, heteropoly acid of phosphomolybdic, phosphotungstic and superacid of molybdenum-antimony fluoride were used. Deep hydrocracking of residue was noticed even at moderate operating conditions for all acidic catalysts. Due to higher hydrogenating functionality of tungsten, the HDM activity of the phosphotungstic acid is higher than that of molybdenum containing acids. Even the residue hydrocracking activity of former catalyst is also high. It is also noticed from sulphur distribution of liquid product that thiophenic sulphur compounds are formed due to C-S bond cleavage at branching of condensed aromatic rings. Moreover, phosphotungstic acid gives high percentage of aromatic products whereas the considerable amount of saturate hydrocarbons is produced by phosphomolybdic acid. The coke produced by phosphotungstic acid catalyst is hard in nature indicating that extensive polymerization reaction occurs at reaction conditions. Higher H/C ratio indicates the deep hydrogenation of liquid products in presence of super acids. Instead of use superacid, tungsten based heteropoly acid can be effectively used for hydrocracking of residue.

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“…For this type of catalysts, coke and metal depositions are the main causes of deactivation. Several studies on deactivation by metals and coke in hydroprocessing catalysts have been reported [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Nonetheless, only few studies on deactivation pattern along residue hydrotreating bench-scale reactor have been published [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%