Mobil Oil Corporation

Nancy P Forbus

Warren W Kaeding

Margaret M Wu

Margaret May-Som Wu

A process for using hydrogen-containing gas to regenerate a zeolite catalyst comprising at least some crystalline aluminosilicate zeolitic material having pore windows formed by 8-membered rings of oxygen atoms, e.g., ZSM-34, which has been used to promote conversion of methanol and/or methyl ether to light olefins. Contact of such catalysts with hydrogen-containing gas such as hydrogen or synthesis gas at particular regeneration temperatures and pressures can restore the activity of such catalysts either in the presence or absence of organic reactants without forming potentially catalyst-damaging by-products such as water.

Regeneration of methanol/methyl ether conversion catalysts

A method is provided for treating modified ZSM-5 type zeolite catalysts with a vapor phase organophosphorus reagent such as trimethylphosphite or dimethylmethylphosphonate in order to improve the para-selective properties of such catalysts for the conversion of aromatic materials. The modified zeolites so treated are those which contain a minor proportion of a difficultly reducible oxide such as magnesium oxide, calcium oxide and/or phosphorus oxide. Such catalyst compositions can be used in alkylation, transalkylation or disproportionation processes to provide alkylated aromatic product mixtures having exceptionally high concentrations of the para-dialkylbenzene isomer.

Organophosphorus-treated zeolite catalysts for para-selective aromatics

There is provided a catalyst comprising ZSM-12 and two modifiers. The modifiers are (i) magnesium and/or manganese and (ii) platinum. There is also provided a process for converting propane to propylene by a dehydrogenation reaction with this catalyst.

Modified ZSM-12 catalysts and processes for conversion of propane to

A process for converting methanol and/or methyl ether to light olefins over a zeolite catalyst comprising at least some crystalline aluminosilicate zeolitic material having pore windows formed by 8-membered rings of oxygen atoms, e.g., Zeolon 500 or ZSM-34, in the presence of hydrogen, or mixtures of hydrogen and carbon monoxide as a gaseous diluent, at elevated temperature and pressure. By using such zeolite catalysts, hydrogen-containing diluents and reaction conditions, methanol and/or methyl ether can be converted to an olefin-containing hydrocarbon product enriched in ethylene and propylene with enhanced catalyst lifetime.

Process for light olefin production

A method is provided for treating modified ZSM-5 type zeolite catalysts with a vapor phase organophosphorus reagent such as trimethylphosphite in order to improve the para-selective properties of such catalysts for the conversion of aromatic materials. The modified zeolites so treated are those which contain a minor proportion of a difficultly reducible oxide such as magnesium oxide, calcium oxide and/or phosphorus oxide. Such catalyst compositions can be used in alkylation, transalkylation or disproportionation processes to provide alkylated aromatic product mixtures having exceptionally high concentrations of the para-dialkylbenzene isomer.

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Newtown, PA, United States of America

Nancy P Forbus