Mobil Oil Corporation

Catherine T Sigal

John P McWilliams

Robert C Wilson, Jr

David A Pappal

Sowmithri Krishnamurthy

Thomas R Kiliany, Jr

Margaret I Nemet-Mavrodin

There is provided an improvement for making large crystallite ZSM-5 zeolites by a method comprising forming the zeolite in a medium containing a combination of tetramethylammonium and tetrapropylammonium cations. The improvement involves the addition of sodium chloride to the aqueous reaction medium to increase the uniformity of crystallite size and to increase the mean crystallite size. Also provided are catalysts comprising these ZSM-5 crystallites and processes for converting organic compounds with these catalysts.

ZSM-5 zeolites having uniformly large crystals

Abatement of nitrogen oxides in an industrial exhaust gas is effected by reduction of the nitrogen oxides with ammonia in the presence of a catalyst comprising a porous crystalline siliceous solid such as a ZSM-5 type zeolite. Fast responses to changes of NO.sub.x load is achieved with a zeolite of low to moderate acid activity. The catalyst may be virgin catalyst, aged catalyst previously used for the conversion of a hydrocarbon or an organic compound, or artifically aged catalyst.

Abatement of NO.sub.x in exhaust gases

A method is provided for removing trace amounts of organic chlorides from feedstocks by passing the feedstock in contact with a guard bed catalyst comprising shaped particles formed by extruding a mixture of magnesium oxide and a binder inert to the feedstock. The process has particular importance in removing organic chlorides from toluene feedstocks prior to contacting toluene with a disproportionation or alkylation catalyst comprising magnesium-ZSM-5.

Growing community of inventors

Pennington, NJ, United States of America

Catherine T Sigal