Cracking catalysts deactivation by nickel and vanadium contaminants

Larocca, M.; Lasa, Hugo de; Farag, Hany; Ng, Samson

doi:10.1021/ie00107a002

Cited by 36 publications

(32 citation statements)

References 11 publications

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“…This distribution may be explained considering the low acidity of these supports which results in a lower gas oil cracking activity producing fewer gases and naphtha. Also the trend for a low proportion of gases and naphtha is accentuated at higher temperatures and for the highest level of metal in the feed, as has been reported in the literature [5]. Table 3 wt.% HDS, wt.% HDT, and product distribution, obtained in the mild hydrotreating of FCC feed.…”

Section: Resultssupporting

confidence: 71%

Mild hydrotreating over NiMo/sepiolite catalyst

Martín¹,

Melo

2006

React Kinet Catal Lett

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In order to introduce an alternative catalyst for hydrotreating (HDT) reaction a study of NiMo supported on natural sepiolite catalysts is presented. The sepiolite catalyst has been prepared in this laboratory and a NiMo/Al 2 O 3 commercial catalyst is used as a reference. The textural properties of the materials and their catalytic activity in hydrotreating (HDT) and hydrodesulfuration (HDS) using an FCC feed at 400-475°C and 50 MPa total pressure, have been evaluated. The support of the commercial catalyst is alumina containing mesopores. The sepiolite support is a hydrated magnesium phylosilicate containing micropores but with an open structure that confers the possibility to use it as a catalyst. The hydrotreating conversion (wt.% HDT) is defined here as the net hydrotreating conversion into products boiling below 380°C. For the commercial catalyst the wt.% HDT was only 5% higher than for the catalyst supported on sepiolite and the product selectivity was very similar. HDS conversion was 20% lower for the sepiolite supported catalyst. Taking into account these results the sepiolite is a suitable support of HDS catalysts.

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Section: Resultssupporting

confidence: 71%

Mild hydrotreating over NiMo/sepiolite catalyst

Martín¹,

Melo

2006

React Kinet Catal Lett

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“…The most common metals, which are present in the FCC feedstocks are vanadium [2], nickel [3,4] and iron [5,6]. These metals act as poisons to acid sites of the zeolite and present dehydrogenative characteristics.…”

Section: Introductionmentioning

confidence: 99%

Vanadium effect on HUSY zeolite deactivation during hydrothermal treatment and cyclohexane model reaction

Oliveira

Herbst

Cerqueira

et al. 2005

Applied Catalysis A: General

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“…The activity of the fast pyrolysis catalyst is normally enhanced via improved acidity because dense and strong acid sites are required to crack the heavy fractions, deoxygenate the oxygenate compounds in bio-oil and aromatize the lighter species into gasoline range aromatics. Although the incorporation of Ga was previously found to improve the pyrolysis of lignin with Ga/H-ZSM-5, the depositions of these metal species have been known to reduce catalyst acidity and modify the reaction routes [99][100][101][102][103]. Recently, Shwan et al [104] demonstrated that 10-50 ppm of K to could deactivate both H-BEA and Fe/H-BEA catalysts due to the formation of ionic clusters in the zeolite channels and the exchange of active Brønsted acid sites with K + ions.…”

Section: Influence Of Metal Depositsmentioning

confidence: 99%