Hydrotreating catalysts on different supports and its acid–base properties

Trejo, Fernando; Rana, Mohan S.; Ancheyta, Jorge; Rueda, Ana Julia Velez

doi:10.1016/j.fuel.2012.04.026

Cited by 28 publications

(16 citation statements)

References 46 publications

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“…The SEM, tunneling electron microscopy, HRTEM analysis methods are used to characterize the asphaltene aggregates on surfaces. The effects of different parameters such as oil solvent type and temperature on the precipitated asphaltenes from oil have been studied using these techniques by different researchers . In the SEM studies, two different morphologies including compact structure and porous structure have been observed .…”

Section: The Size and Structure Of Asphaltene Aggregatesmentioning

confidence: 99%

A comprehensive study on mechanism of formation and techniques to diagnose asphaltene structure; molecular and aggregates: a review

Hosseini-Dastgerdi

Tabatabaei-Nejad

Khodapanah

et al. 2014

Asia-Pacific J Chem Eng

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As the formation of asphaltene aggregates causes its deposition in various processes, exact determination of the molecular and aggregate structure and mechanism of aggregate formation is very important in order to prevent asphaltene deposit formation. The aim of this paper is to review the molecular and aggregate structure of asphaltene using various techniques. The other purpose is to specify and compare different mechanisms of aggregate formation, suggested by researchers. These mechanisms are proposed by researchers according to the molecular characteristics of asphaltene and the structure of aggregates. Researchers have considered four general models for the formation mechanism of asphaltene aggregates: the micellar/colloidal, polymeric, solubility, and modified Yen models. In comparison with other models, the modified Yen model shows more consistency with new studies, which determine the island molecular structure and small nano-aggregates for asphaltene. Experimental studies show that the dominant mechanism of aggregate formation depends on asphaltene architecture, intermolecular forces, and the solubility definition of asphaltene. Depending on the asphaltene source, solvent, thermodynamic conditions, and various techniques such as near-infrared spectroscopy, nuclear magnetic resonance, small-angle neutron scattering, and small-angle X-ray scattering, different structural information on the shape (spheres, discoid, oblate, membrane-like, prolate cylinders, and mass fractal aggregates) and size of aggregates has been reported.

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Section: The Size and Structure Of Asphaltene Aggregatesmentioning

confidence: 99%

A comprehensive study on mechanism of formation and techniques to diagnose asphaltene structure; molecular and aggregates: a review

Hosseini-Dastgerdi

Tabatabaei-Nejad

Khodapanah

et al. 2014

Asia-Pacific J Chem Eng

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“…Crocker and co‐workers reported the performances of NiAl LDH (NiAl layered double hydroxide catalyst), 20 wt% Ni/Al 2 O 3 and 20 wt% Ni/C catalysts in the DCX and DCN reactions of stearic acid at 300°C for 1.5 h (Table ) as a function of the atmosphere composition (N 2 , 10 vol% H 2 in N 2 or H 2 ) . The 20 wt% Ni/Al 2 O 3 and NiAl LDH catalysts gave 81% and 73% of conversion of stearic acid, respectively and 57% and 52% selectivities to n ‐heptadecane respectively, when the reaction was carried out in the presence of pure hydrogen, which was much higher than the performances observed under N 2 with respective values of 9% and 10% in conversion, respectively and 38% and 13% in selectivities, respectively.…”

Section: Of Fatty Acids Over Monometallic Catalystsmentioning

confidence: 96%

“…It is well known that the catalytic performances of the supported species can be tuned depending on the properties of the support used, which is obviously the case of metal‐based catalysts . Various supports such as SiO 2 , Ce 2 O 3 , Al 2 O 3 , CrO 3 , and TiO 2 , C, basic composite oxides, bifunctional acid–base oxides (ZrO 2 ), and zeolites were studied on DCX reactions.…”

Section: Of Fatty Acids Over Monometallic Catalystsmentioning

confidence: 99%

Catalytic decarboxylation of fatty acids to hydrocarbons over non‐noble metal catalysts: the state of the art

Kiméné

Wojcieszak

Paul

et al. 2018

J of Chemical Tech & Biotech

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The catalytic decarboxylation of fatty acids to yield hydrocarbons, for use as biofuel as a main target, is a topical reaction in which the main challenge is actually to control the selectivity while using the smallest amount of hydrogen possible (or even better, not using hydrogen at all) in order to optimize cost-efficiency of the process. Herein, the focus is on the non-noble mono-, biand tri-metallic catalysts used to carry out this reaction. Historically, several non-noble monometallic catalysts based on Cu, Co, Ni supported on different types of supports were first studied. Among such materials, the Co-based catalysts were not selective, while, Cu-based catalysts were more or less selective to hydrocarbons or to olefins, depending on the support used. Among these three metals, the Ni-based catalysts are the most widely described ones due to their specific ability to promote deoxygenation reactions. Combining Ni to a second metal yielded a synergistic effect toward better catalytic performances, with increases in both conversion and selectivity and also improvement of the resistance of the catalyst to carbon deposit, especially when adding non-noble metals. For future prospects, it appears that the main challenge will be to be able to maintain good catalytic performances under inert gas in solvent-free conditions, in order to yield a fully environmentally friendly and cost-effective process. REFERENCES1 Hermida L, Abdullah AZ and Mohamed AR, Deoxygenation of fatty acid to produce diesel-like hydrocarbons: a review of process conditions, reaction kinetics and mechanism. Renew Sust Energ Rev 42:1223-1233 (2015).

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“…It may significantly improve the quality of refined oil by hydrodesulfurization, hydrodenitrogenation, hydrodeasphaltenization, hydrodemetallization and decomposition of heavy components. The refining catalysts for the petroleum-based heavy oil are well developed and presented in the literature [30][31][32][33]. However, different from petroleum, the crude pyrolysis oil from municipal wastes contains a lot of non-hydrocarbon components in rich of nitrogen and oxygen.…”

Section: Introductionmentioning

confidence: 99%

Hydrocracking of the crude oil from thermal pyrolysis of municipal wastes over bi-functional Mo–Ni catalyst

Xia

et al. 2016

Catalysis Today

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Hydrotreating catalysts on different supports and its acid–base properties

Cited by 28 publications

References 46 publications

A comprehensive study on mechanism of formation and techniques to diagnose asphaltene structure; molecular and aggregates: a review

A comprehensive study on mechanism of formation and techniques to diagnose asphaltene structure; molecular and aggregates: a review

Catalytic decarboxylation of fatty acids to hydrocarbons over non‐noble metal catalysts: the state of the art

Hydrocracking of the crude oil from thermal pyrolysis of municipal wastes over bi-functional Mo–Ni catalyst

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