Inhibiting effect of decanoic acid and its by-products on the transformation of n-hexadecane over a Pt/SiO2-Al2O3 catalyst

Guedes, Apa; Bouchy, Christophe; Brunet, Sylvette

doi:10.1016/j.apcatb.2016.03.072

Cited by 5 publications

(5 citation statements)

References 31 publications

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“…Under these conditions, it was H 2 O made during the HDO of the oxygenates, which was the main contributor to the activity loss. This was confirmed by the results in Figure , showing the effect of different oxygenates on the loss of activity expressed as the ratio of activity in the presence of oxygenates (A) to that of the free n -hexadecane (A o ) . The amount of added oxygenates is expressed in terms of partial pressure of H 2 O produced during the HDO of corresponding oxygenates.…”

Section: Deactivationsupporting

confidence: 71%

“…127 Only about 0.4 wt% of coke was deposited in the presence of decanol compared with 1.5 wt% for the same amount of H 2 O. The inhibition of metallic sites by H 2 O was further confirmed in another study conducted by Guedes et al 128 under identical conditions. In this study, the HCR-HIS conversion of n-hexadecane was studied in the presence of oxygenates such as decan-1-ol, decanoic acid, CO, and CO 2 .…”

Section: Energy and Fuelsmentioning

confidence: 61%

“…This was confirmed by the results in Figure 23, showing the effect of different oxygenates on the loss of activity expressed as the ratio of activity in the presence of oxygenates (A) to that of the free n-hexadecane (A o ). 128 The amount of added oxygenates is expressed in terms of partial pressure of H 2 O produced during the HDO of corresponding oxygenates. The results in Figures 22 and 23 suggest that the active sites associated with NM, rather than the acidic sites on the support were deactivated by H 2 O.…”

Section: Energy and Fuelsmentioning

confidence: 99%

“…Effect of oxygenates on conversion of n -hexadecane as a function of partial pressure of produced H 2 O (608 K, 5 MPa, Pt/SiO 2 -Al 2 O 3 ). Reprinted with permission from ref . Copyright 2016 Elsevier B.V.…”

Section: Deactivationmentioning

confidence: 99%

“…The sintering of NMs on catalyst surface during HPR has been recognized as one of the causes of catalyst deactivation. The presence of oxygenates in reaction streams is among the causes leading to the active metal particles aggregation. , According to general observations, the aggregation of NMs particles on catalyst support can be controlled by alloying with either transition metals or other NMs. For monometallic NMs-containing catalysts, the extent of aggregation depends on the type of support.…”

Section: Deactivationmentioning

confidence: 99%

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Hydroprocessing Catalysts Containing Noble Metals: Deactivation, Regeneration, Metals Reclamation, and Environment and Safety

Marafi

Furimsky²

2017

Energy Fuels

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Interest in the use of catalysts containing noble metals (NMs) in various hydroprocessing (HPR) applications is the result of an increasing volume of unconventional feeds and a continuous change in performance parameters of petroleum products. Conventional HPR catalysts can only partially fulfill new requirements. The high price of NMs and their high activity under both reducing and oxidative atmospheres require some modifications of the strategies that have been used for the handling of spent conventional HPR catalysts. Because of their higher activity, the deactivation of NMs-containing catalysts during HPR occurs under less severe conditions compared with that of conventional HPR catalysts. However, adverse effects of sulfur, nitrogen, oxygenates, and metals in feeds may require a higher severity to achieve HPR objectives. The activity of spent NMscontaining catalysts can be almost completely recovered by regeneration. The oxidative regeneration of spent NMs-containing catalysts has been performed commercially, while reductive and extractive regenerations offer alternative routes. The high value of NMs dictates that metal recovery is the only option if an adequate catalyst activity recovery cannot be achieved by regeneration. The methods are available for NMs recovery on an industrial scale. Also, the research aiming at improvement of metals recovery via existing methods as well as development novel methods has been noted.

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Section: Deactivationsupporting

confidence: 71%

Section: Energy and Fuelsmentioning

confidence: 61%

Section: Energy and Fuelsmentioning

confidence: 99%

Section: Deactivationmentioning

confidence: 99%

Section: Deactivationmentioning

confidence: 99%

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