Catalyst selectivation

B - Operations – Transporting – 01 – J

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B01J 29/40 (2006.01) B01J 29/06 (2006.01) B01J 29/85 (2006.01) B01J 37/08 (2006.01) C07C 2/86 (2006.01) C07C 15/08 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2371225

It has been discovered that catalysts may be modified by depositing an agent derivative from an agent such as an organometallic compound upon them. Such a modification gives a catalyst useful in increased selectivity to para- substituted alkyl benzenes, such as para-xylene (PX), through reacting an aromatic compound such as toluene and/or benzene with a methylating agent from hydrogen and carbon monoxide and/or carbon dioxide and/or methanol. Using these selectivated catalysts, para-substituted alkyl benzenes can be recovered in a selectivity of 80 % or greater, significantly better than the equilibrium concentration of 24 %.

Cette invention concerne la modification de catalyseurs par dépôt à la surface de ces catalyseurs d'un agent dérivé d'un agent du type composé organométallique. Une telle modification permet d'obtenir un catalyseur à sélectivité accrue face aux alkylbenzènes para-substitués, tels que le para-xylène (PX), par réaction d'un composé aromatique tel que le toluène et/ou le benzène, avec un agent de méthylation sélectionné parmi l'hydrogène et le monoxyde de carbone et/ou le dioxyde de carbone et/ou le méthanol. L'utilisation de ces catalyseurs à sélectivité accrue permet la récupération d'alkylbenzènes para-substitués avec une sélectivité supérieure ou égale à 80 %, largement supérieure à la concentration d'équilibre de 24 %.

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