The suspending role of H2O and CO on catalytic hydrotreatment of gas-oil; myth or reality?

Bezergianni, Stella; Dagonikou, Vasiliki; Sklari, S.D.

doi:10.1016/j.fuproc.2015.12.007

Cited by 21 publications

(6 citation statements)

References 31 publications

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“…Nevertheless, there is an exception with CO/CO 2 gases produced during the triacylglycerols deoxygenation reactions, in which those are the main products from the HDC/HDCn reactions. In this case, depending on the used catalysts, an inhibition effect of CO/CO 2 has been reported [144,145] due to a decrease of H 2 partial pressure and absorption phenomena of CO on active sites on CoMo catalysts, affecting the hydrotreating activity. Conventional NiMo hydrotreating catalysts look to be more efficient in the top layers of the industrial catalyst bed of industrial hydrotreating units [146].…”

Section: Hydrogen Consumption Due To Triacylglycerols Co-processingmentioning

confidence: 95%

The Catalysed Transformation of Vegetable Oils or Animal Fats to Biofuels and Bio-Lubricants: A Review

et al. 2021

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This review paper summarizes the current state-of-the-art of the chemical transformation of oils/fats (i.e., triacylglycerols) to the use of biofuels or bio-lubricants in the means of transport, which is a novelty. The chemical transformation is necessary to obtain products that are more usable with properties corresponding to fuels synthesized from crude oil. Two types of fuels are described—biodiesel (the mixture of methyl esters produced by transesterification) and green diesel (paraffins produced by hydrogenation of oils). Moreover, three bio-lubricant synthesis methods are described. The transformation, which is usually catalysed, depends on: (i) the type and composition of the raw material, including alcohols for biodiesel production and hydrogen for green diesel; (ii) the type of the catalyst in the case of catalysed reactions; (iii) the reaction conditions; and (iv) types of final products. The most important catalysts, especially heterogeneous and including reaction conditions, for each product are described. The properties of biodiesel and green diesel and a comparison with diesel from crude oil are also discussed.

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Section: Hydrogen Consumption Due To Triacylglycerols Co-processingmentioning

confidence: 95%

The Catalysed Transformation of Vegetable Oils or Animal Fats to Biofuels and Bio-Lubricants: A Review

et al. 2021

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“…As shown in Figure , (H)DCO 2 and DCO reaction pathways appear promising from an industrial perspective since they require less H 2 than HDO. However, CO 2 and CO derived from these pathways continue to react with H 2 and these gaseous byproducts may cause a significant increase in H 2 consumption through side reactions, such as water gas shift and methanation. ,,− …”

Section: Reactive Systemmentioning

confidence: 99%

Key Factors to Use Existing Commercial Hydrotreating Plants for the Co-Hydrotreating of Vegetable Oil and Gas Oil

Cárdenas-Guerra,

Alonso,

Ancheyta

2023

Ind. Eng. Chem. Res.

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The production of renewable fuels by co-hydrotreating is considered a very promising solution to make use of the existing petroleum refining infrastructure. Differently to stand-alone hydrotreating, co-hydrotreating requires lower investment costs. To design a co-hydrotreating of vegetable oil and gas oil, various issues need to be properly examined. This work reports an extensive review and discussion of such issues to provide a clear understanding of the effects on feedstocks, operating conditions, catalysts, corrosion, and product quality. The discussion also includes the challenges for modeling and simulation of co-hydrotreating processes.

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“…These results can be explained by the low initial H 2 /oil molar ratio used, as well as the coke deposition and inhibition of the catalyst by CO. Some works have reported that the presence of CO reduces the activity of the sulfided NiMo catalyst and reduces the HVO yield [33,34].…”

Section: Hydrotreating With Bio-syngas and E-syngasmentioning

confidence: 99%

Renewable Diesel from Palm Oil Using Bio‐Syngas from Palm Empty Fruit Bunches as a Hydrogen Source

et al. 2022

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Biofuels have emerged as alternatives to fossil fuels for reducing CO 2 emissions. Bio-syngas obtained from palm empty fruit bunches was used in the hydrotreating of palm oil, yielding an oil conversion and a renewable diesel purity very similar to the values obtained when using pure H 2 , under similar reaction conditions. The presence of CO in bio-syngas decreases the stability of the catalyst by coke deposition. However, this drawback can be circumvented by regenerating the catalyst or by converting CO into CO 2 and H 2 through the water-gas shift (WGS) reaction. The use of bio-syngas and its WGS product eliminates the need of an expensive H 2 purification process, and the lower H 2 purity in syngas is compensated by a moderate increase in the reaction time.

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The suspending role of H2O and CO on catalytic hydrotreatment of gas-oil; myth or reality?

Cited by 21 publications

References 31 publications

The Catalysed Transformation of Vegetable Oils or Animal Fats to Biofuels and Bio-Lubricants: A Review

The Catalysed Transformation of Vegetable Oils or Animal Fats to Biofuels and Bio-Lubricants: A Review

Key Factors to Use Existing Commercial Hydrotreating Plants for the Co-Hydrotreating of Vegetable Oil and Gas Oil

Renewable Diesel from Palm Oil Using Bio‐Syngas from Palm Empty Fruit Bunches as a Hydrogen Source

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