Catalyst hydrodenitrogenation

Virtually all of these processes rely on promoted molybdenum sulfide (MoS2) catalysts. Hydrodenitrogenation catalysts are usually nickel-promoted... 

Figure 2. Catalyst hydrodenitrogenation activity response. Feed FMC oil catalyst BD pressure 1500 psig H2/oil ratio 7500 scf/bbl space time 2.99 hr (LVHST). (O), 371°C (700°F) (U), 427°C (800°F) (A),...

The primary determinant of catalyst surface area is the support surface area, except in the case of certain catalysts where extremely fine dispersions of active material are obtained. As a rule, catalysts intended for catalytic conversions utilizing hydrogen, eg, hydrogenation, hydrodesulfurization, and hydrodenitrogenation, can utilize high surface area supports, whereas those intended for selective oxidation, eg, olefin epoxidation, require low surface area supports to avoid troublesome side reactions. 

Reaction Kinetics of the Hydrodenitrogenation of Decahydroquinoline over NiMo(P)/Al203 Catalysts... 

Hydrodenitrogenation (HDN) is an important process in petroleum refining. It removes nitrogen from oil distillates, so that less NOx pollutes the air when oil is burned and poisoning of the subsequent refining catalysts is reduced when the oil is processed further. Although HDN has been studied intensively and different reaction mechanisms, catalytic active sites, and functions of the catalytic components have been proposed, there are stiU many questions to be answered in order to better mderstand the reaction and the catalyst (1-4). 

Mathur, K. N. Schrenk, M. D. Kwart, H., and Katzer, J. R., Development of Unique Catalysts for Hydrodenitrogenation of Coal-Derived Liquids. DOE, Office of Fossil Energy. 1982. 

Gopalan, U., Hydrodenitrogenation of Pyridine over Alumina Supported Platinum Catalyst. Master of Applied Science Thesis. University of Otawa, Chemical Engineering. 1998, p. 69. 

Catalysts used for hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) of heavy oil fractions are largely based on alumina-supported molybdenum or tungsten to which cobalt or nickel is added as a promoter [11]. As the catalysts are active in the sulfided state, activation is carried out by treating the oxidic catalyst precursor in a mixture of H2S and H2 (or by exposing the catalyst to the sulfur-containing feed). The function of hydrogen is to prevent the decomposition of the relatively unstable H2S to elemental sulfur, which would otherwise accumulate on the surface of the... 

The use of nitrides, along with sulfides and carbides, as catalysts for hydroprocessing has recently been extensively reviewed by Furimsky and will not be discussed in detail here. Subsequently, Al-Megren et have published a comparison of the activities of bulk CoMo carbide, oxide, nitride and sulfide catalysts for pyridine hydrodenitrogenation. Of these, the sulfide catalysts were reported to possess more stable activity, with the carbide being next, followed... 

Trickle-bed reactors usually consist of a fixed bed of catalyst particles, contacted by a gas liquid two-phase flow, with co-current downflow as the most common mode of operation. Such reactors are particularly important in the petroleum industry, where they are used primarily for hydrocracking, hydrodesulfurization, and hydrodenitrogenation other commercial applications are found in the petrochemical industry, involving mainly hydrogenation and oxidation of organic compounds. Two important quantities used to characterize a trickle-bed reactor are... 

Iron catalysts exhibit much lower activity for the heteroatom-removing reactions such as hydrodenitrogenation(HDN) and hydrodesulfurization(HDS) compared with Mo-based catalysts (97). 

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