Abstract: A process for shape selective hydrocarbon conversion that involves contacting a hydrocarbon feedsteam, including toluene, under conversion conditions with a catalytic molecular sieve which has been modified by being ex situ selectivated with a silicon compound. The ex situ selectivation involves exposing the molecular sieve to at least two silicon impregnation sequences, each sequence comprising an impregnation with a silicon compound followed by calcination. The modified catalyst used in the process may also be steamed. Optionally, the modified catalyst may be trim-selectivated.

Abstract: A sensor device includes ultra-large pore crystalline material M41S as a selective detecting element, and a measuring element for quantifying physical, chemical or biological events which occur within the crystalline material. The crystalline material may also contain an additional selective detecting component within its pores.

Abstract: A material exhibiting third order nonlinear optic properties includes quantum size clusters of semiconducting guest material incorporated into the pores of M41S material in an arrangement to provide nonlinear optic properties.A material exhibiting second order nonlinear optic properties includes an organic guest material incorporated into the pores of M41S material so that a non-centrosymmetric structure is formed which will provide second harmonic generation when subjected to electromagnetic radiation of a selected frequency.

Abstract: A mixture of aromatic hydrocarbons, comprising xylenes, is isomerized in the presence of ZSM-22 zeolite to produce a product stream wherein the proportion of para-xylene is substantially equal to the equilibrium ratio of the para-isomer. The process is conducted at about 500.degree. F. to about 1100.degree. F., at about 0 to about 3000 psig, optionally in the presence of hydrogen, and also optionally with the catalyst comprising about 0.005% to about 5.0% of a metal, e.g., platinum, palladium or cobalt, based on total catalyst weight.

Abstract: A process is provided for converting feedstock aromatic compounds by alkylation, transalkylation, disproportionation and/or isomerization over a catalyst comprising zeolite ZSM-58.

Abstract: The viscosity index of synthetic lubricant stocks such as those produced by olefin oligomerization is increased by contacting such stocks with a solid acidic isomerization catalyst such as boron trifluoride at elevated temperatures, say above about 200.degree. C. The high viscosity index fractions of the resulting product may be sorbed by a shape-selective zeolite such as ZSM-5 and recovered to produce a high VI lubricant.

Abstract: In the process of converting an aromatic feedstock to an alkyl-substituted mono-nuclear aromatic product by contacting the feedstock with a coke-selectivated ZSM-5 type catalyst at elevated temperature under conversion process coking conditions to produce said alkyl-1-substituted mononuclear aromatic product selectively, the improvement which comprises:regenerating the process coked catalyst in contact with a non-oxidizing atmosphere comprising an effective amount of hydrogen at a temperature of about 800.degree. F. to 1200.degree. F. to restore activity of the catalyst while retaining selectivity. Advantageously, the conversion involves alkylation, disproportionation and/or isomerization to produce at least one lower alkyl or dialkyl benzene product.

Abstract: A waveform measurement system includes a feature in which a readout of an absolute ground-reference voltage at a particular selectable time point along a waveform is provided. A ground reference potential is sampled and stored, and the instantaneous voltage value of the waveform at the time point is arithmetically combined with the reference potential to provide the measurement. Intensified dots, as well as horizontal volts cursors, are generated and displayed on the waveform at the ground reference and selected instantaneous voltage value positions.

Abstract: Disclosed is a zeolite base catalyst useful particularly for the selective production of para-dialkylsubstituted benzene. The catalyst comprises a porous crystalline zeolite having silica deposited thereon and having incorporated therein phosphorous. Described also in the process for making the catalyst and the parameters for the use of the catalyst in dialkylation processes.

Abstract: Disclosed is a zeolite base catalyst useful particularly for the selective production of para-dialkylsubstituted benzene. The catalyst comprises a porous crystalline zeolite having silica deposited thereon and having incorporated therein phosphorous. Described also in the process for making the catalyst and the parameters for the use of the catalyst in dialkylation processes.

Abstract: A method is provided for regeneration of a catalyst comprising a crystalline aluminosilicate zeolite characterized by a silica to alumina mole ratio of at least about 12, a constraint index, as hereinafter defined, within the approximate range of 1 to 12, which catalyst has undergone controlled precoking by exposing the same to a thermally decomposable organic compound at a temperature in excess of the decomposition temperature of said compound but less than about 1200.degree. F., at a hydrogen to organic compound mole ratio of between 0 and 1 to deposit at least about 1 weight percent coke thereon, such precoked catalyst having been deactivated by formation of a carbonaceous deposit thereon as a result of use of the same in catalytically converting an organic charge under conditions less severe, i.e.

Abstract: A catalytic process is provided for isomerizing an isomerization feed containing an aromatic C.sub.8 mixture of ethylbenzene and xylene in which the para-xylene content is less than equilibrium which comprises contacting said feed, under conversion conditions, with a catalyst comprising a crystalline aluminosilicate zeolite having a crystal size of at least about 1 micron, a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12 to yield an isomerization product characterized by a reduced ethylbenzene content and an enhanced para-xylene content.

Abstract: A process is provided for alkylation or transalkylation of aromatic hydrocarbons by contacting same with an alkylating or transalkylating agent in a reaction zone maintained under alkylation/transalkylation effective conditions and in the presence of a catalyst comprising a crystalline aluminosilicate zeolite ZSM-35 and/or ZSM-38, said catalyst under said conditions being capable of affording a high and selective yield of desired alkyl-aromatic product while maintaining excellent aging properties.

Abstract: A catalytic process is provided for the selective production of para dialkyl substituted benzenes containing alkyl groups of 1 to 4 carbon atoms, typified by para-xylene, by contacting, under conversion conditions, a hydrocarbon precursor selected from the group consisting of mono alkyl-substituted benzenes having 1-4 carbon atoms in the alkyl substituent, e.g., toluene, ethyl benzene, propyl benzene, or butyl benzene; a C.sub.2 -C.sub.15 olefin and a C.sub.3 -C.sub.60 paraffin, or mixtures thereof including mixtures of benzene with at least one of the aforementioned olefins or paraffins with a zeolite-containing catalyst characterized by a xylene sorption capacity greater than 1 gram/100 grams of zeolite and an ortho xylene sorption time for 30 percent of said capacity of greater than 10 minutes, said sorption capacity and sorption time being measured at 120.degree. C and a xylene pressure of 4.5 .+-.0.8 mm.

Abstract: A catalytic process is provided for the selective production of para-xylene by disproportionation of toluene in the presence of a catalyst comprising a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, which catalyst has undergone controlled precoking, i.e. selectivation, by exposing the same to a thermally decomposable organic compound at a temperature in excess of the decomposition temperature of said compound, generally greater than 1000.degree. F., but less than about 1200.degree. F., at a hydrogen to organic compound mole ratio between 0 and 1 to deposit at least about 2 weight percent coke thereon and thereafter contacting toluene with the resulting coke-containing catalyst under disproportionation conditions including a temperature between about 800.degree. F. and 1025.degree. F., and preferably between about 825.degree. F. and 1000.degree. F.

Abstract: A process is provided for alkylation or transalkylation of aromatic hydrocarbons by contacting same with an alkylating or transalkylating agent in a reaction zone maintained under alkylation/transalkylation effective conditions and in the presence of a catalyst comprising a crystalline aluminosilicate zeolite characterized by a unique X-ray diffraction pattern, said catalyst under said conditions being capable of affording a high and selective yield of desired alkylaromatic product while maintaining excellent aging properties.

Abstract: Ferrierite ore is activated for normal paraffin conversion by exchanging with the ammonium ion, heating in air at a temperature from about 775.degree. F to about 1000.degree. F and exchanging again with the ammonium ion. Activation of ammonium ferrierite for conversion of branched paraffins is accomplished (1) by treatment with HF or (2) by heating in steam at a temperature within the above range, followed by exchange with ammonium ion. Ferrierite ore per se may be treated with HF, but to complete activation for conversion of branched paraffins, the HF treated ore must be exchanged with the ammonium ion.

Abstract: Process for the alkylation of aromatic hydrocarbons by contacting same with an olefin alkylating agent in a reaction zone maintained under conditions such that said alkylation is accomplished in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12, said catalyst having been modified by prior thermal treatment to reduce the activity thereof, as determined by an alpha value, as described herein, to less than about 250 and preferably within the range of less than about 200 but greater than 10.

Abstract: Ferrierite ore is activated for normal paraffin conversion by exchanging with the ammonium ion, heating in air at a temperature from about 775.degree. to about 1000.degree. F and exchanging again with the ammonium ion. Activation of ammonium ferrierite for conversion of branched paraffins is accomplished (1) by treatment with HF or (2) by heating in steam at a temperature within the above range, followed by exchange with ammonium ion. Ferrierite ore per se may be treated with HF, but to complete activation for conversion of branched paraffins, the HF treated ore must be exchanged with the ammonium ion.

Abstract: A catalytic process is provided for isomerizing an isomerization feed containing an aromatic C.sub.8 mixture of ethylbenzene and xylene in which the para-xylene content is less than equilibrium which comprises contacting said feed, under conversion conditions, with a catalyst comprising a crystalline aluminosilicate zeolite having a crystal size of at least about 1 micron, a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12 to yield an isomerization product characterized by a reduced ethylbenzene content and an enhanced para-xylene content.