Effect of the acid-base properties of additives for a cracking catalyst on the sulfur content in liquid products |
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Authors: | O V Potapenko V P Doronin T P Sorokina T I Gulyaeva V A Drozdov |
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Affiliation: | 1.Institute of Hydrocarbon Processing Problems, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia |
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Abstract: | The effect of the nature and methods for the production of additives for a cracking catalyst on the sulfur content in liquid
cracking products was studied. The influence of the acid-base properties of the additives for a cracking catalyst on the redistribution
of sulfur raw material between gaseous and liquid products, including that in a gasoline fraction with T
EP
= 200°C, is analyzed. It is shown that, in contrast to the earlier concept of the approach to choosing such additives, we
must consider not only the effect of the acid-base properties of additives but also the aromatization reactions facilitating
the formation of hydrogenated thiophene derivatives, which are unstable under catalytic cracking conditions. It is shown that
an increase in the additive acidity promotes the reduction of the residual sulfur content in liquid cracking products. The
enhancement of both the strength and the concentration of basic sites does not reduce the sulfur content. The simultaneous
presence of acidic and basic sites in the structure of a mixed Mg-Al oxide with a spinel structure affords deeper sulfur-refinement
of gasoline than the presence of only acidic sites. Oxides of a series of metals (Zn, Zr, Cr, Ce, Cu, Ca, Mg, Al) with variable
acid-base properties were used as an additive for a LYUKS cracking catalyst (OAO Gazpromneft’-ONPZ). The data obtained allows
us to develop new cracking catalysts (or additives for already existing catalysts) that facilitate the production of motor
fuels (gasoline) answering the more stringent requirements for sulfur content. |
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