Catalysts for reduction of nitrogen oxides

Catalysts for reduction of nitrogen oxides

Patent report tions to promote isomerization second reactor may comprise component. Gasoline upgrading of aliphatics. The catalyst in the alumina...

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Patent

report

tions to promote isomerization second reactor may comprise component.

Gasoline

upgrading

of aliphatics. The catalyst in the alumina, platinum, and a chloride

Branched fins with

process

S.S. Shih Mobil Oil Corp. U.S. 5,348,641, Sept. 20, 1994; Appl. Aug. 15, 1991 Low sulfur gasoline of relatively high octane number is produced from a catalytically cracked, sulfur-containing naphtha by hydrodesulfurization followed by treatment over an acidic catalyst, preferably an intermediate pore size zeolite such as ZSM-5. The treatment over the acidic catalyst in the second step, which is carried out in a hydrogen atmosphere that is essentially free of hydrogen sulfide and ammonia, restores the octane loss that takes place as a result of the hydrogenative treatment and results in a low sulfur gasoline product with an octane number comparable to that of the feed naphtha.

Catalytic catalyst

conversion

of hydrocarbons

with

an improved

R.P.L. Absil; J.A. Herbst Mobil Oil Corp. U.S. 5,348,643, Sept. 20, 1994; Appl. Mar. 12, 1991 Cont.-in-part of U.S. 5,231,064 A process is provided for converting feedstock hydrocarbon compounds over a catalyst composition which comprises clay and a zeolite component, al of which has been treated with a phosphorus-containing compound, for example, ammonium dihydrogen phosphate or phosphoric acid, and which is spray dried at a low pH, preferably lower than about 3. The process produces high octane gasoline and increased lower olefins, especially propylene and butylene.

Zeolite

catalyst

systems

C-L. Oyoung; J. Hazen; D.G. Casey Texaco Development Corp. Eur. Pat. Appl. 615,782, Sept. 21, 1994;

Appl.

Mar.

19, 1992

Normal olefins such as n-butenes can be converted to isoolefins such as isobutylene by skeletal isomeri%ation over catalysts of boron-8 zeolites having pore sizes of 25 A and containing boron in the framework structure. The boron-8 zeolites have sufficient acidity to catalyze the skeletal isomerization of normal olefins to isoolefins. The catalysts can be used to produce isoolefins for reaction with alcohols in integrated processes to produce alkyl tertiary-alkyl ethers such as MTBE.

Gasoline

upgrading

process

particularly useful be used to produce

using

D.L. Fletcher; T.L. Hilbert; S.J. McGovern Mobil Oil Corp. U.S. 5352,354, Oct. 4, 1994; U.S. Appl.

an acid catalyst et al. Aug.

15, 1991

Low sulfur gasoline of relatively high octane number is produced from a catalytically cracked, sulfur-containing naphtha by hydrodesulfurization followed by treatment over an acidic catalyst defined by its X-ray diffraction pattern and preferably comprising the synthetic zeolite MCM-22.

as ring-opening oxidation catalysts adipic acid from cyclohexane.

olefins zeolites

by conversion

of ethene

and may

and C,-,,

ole-

S.R. Wade British Petroleum Co. PLC PCT Int. Appl. 94,12,452. June 9, 1994; U.K. Appl. Dec. 2, 1992 A process for producing C, and C, branched chain olefins involves passing a feedstock containing ethene over a zeolite catalyst in a reaction chamber wherein the feedstock also contains 21 C,-C,, olefin present in the feedstock at a concentration of ~50 ~01% relative to ethene. The zeolite catalyst has a framework structure that includes a lo-member channel that is not intersected by another lo- or 12-membered channel, for example, a ZSM-23 zeolite.

Shape-selective fied nonacidic

hydrogenation platinum/ZSMd

of aromatics catalysts

over modi-

R.M. Dessau Mobil Oil Corp. U.S. 5,350,504, Sept. 27, 1994; Appl. Dec. 18, 1992 Nonacidic tin-, lead-, or indium-modified Pt/ZSM-5 catalysts are effective for the shape-selective preferential hydrogenation of certain aromatic hydrocarbons in admixture with others. These catalysts can be used to reduce the aromatic content of gasoline and distillates.

Hydrocracking

catalyst

J.J. Ward Union Oil Co. of California US. 5,350,501, Sept. 27, 1994; Appl. May 22, 1990 The catalyst contains bqth zeolite 8 and a Y zeolite having either a unit cell size ~24.45 A or a water vapor sorption capacity at 25°C at p/p, of 0.10 of
Catalysts

for exhaust

gas treatment

S. Nojima; K. lida Mitsubishi Heavy Industries Ltd. Jpn. Kokai Tokkyo Koho 94,233,939, Aug. 23, 1994; Appl. Feb. 10, 1993 Three-way catalysts for removing NO, CO, and hydrocarbons from automotive exhaust gases comprise crystalline silicates having a general formulaf (1 * 0.6)&O . [aM,O, . bAl,O,l cMe0. vSi0,. in which R is alkali metal and/or H’ ions: M is Ti. V, Cr, Nb, SbI’Ga, rare earth metal or Group VIII elements; Me is alkaline earth metal; a > 0, b 5 0, c > 0, a + b = 1, y/c > 12, y > 12. The catalysts are durable and useful for denitration of automotive exhaust gases under reducing atmosphere.

Selective

reduction

of nitrogen

oxide

in exhaust

gases

T. Takahashi; S. Kanejima Asahi Chemical Industries Jpn. Kokai Tokkyo Koho 94,228,017, Aug. 16, 1994; Appl. Jan. 28, 1993 Light hydrocarbons (mainly C,-,, paraffins) are converted to lower olefins (mainly ethylene and propene) and arenes (mainly benzene, PhMe, and xylene) by using a zeolite (ZSM-5 or ZSM1 I) catalyst.

A.D. Logan; C.N. Montreuil Ford Motor Co. U.S. 5,354,544, Oct. 11, 1994; Appl. Dec. 27, 1993 The method of treating automotive exhaust gas emissions or stationary source emissions involves introducing an organic hydrocarbon compound or compounds containing nitro or nitroso functional groups (e.g., nitromethane) into the emissions at a location adjacent to the source of emission generation to form a reductant/emission mixture; exposing the mixture to a transition metal-exchanged high silica ZSM-5 zeolite catalyst having ([email protected],OOO) ratio of SiO,/AI,O,; and exposing the effluent from the zeolite catalyst to an oxidation catalyst (e.g., three-way catalyst).

Oxidation

Catalysts

Conversion of light zeolite catalysts

of saturated

hydrocarbons

to lower

olefins

with

hydrocarbons

D.R.C. Huybrechts; P.L. Buskens; G.M.K. Mathys et al. Exxon Chemical Patents, Inc. PCT Int. Appl. 94,02,245, Feb. 3, 1994; U.K. Appl. July 24, 1992 New titanium zeolite 6 catalysts that have been found to be useful as catalysts for the oxidation of organic compounds utilize organic hydroperoxides and/or N,O as oxidants. They are

80

Zeolites

16:79-83,

1996

for reduction

of nitrogen

oxides

S. Tajima; S. Adachi Tosoh Corp. Jpn. Kokai Tokkyo Koho 94,238,168, Aug. 30, 1994; Appl. Feb. 15,1993 Catalyst supports, for catalytic reduction of NO, comprise faujasite-type zeolites (lattice constant 24.43-24.53 A, SiOz/A120, <

Patent

to a zone having a high temperature gas flow for desorption, where the solvent and humiditv are selectively adsorbed by changing the rotation rate of the honeycomb. The honeycomb may be a stack of inorganic fiber based low d sheets with the zeolite impregnated among the fibers.

10, crystal size 51 pm). The catalysts comprise the supports containing Fe, Cu, and/or Co. The process for catalytic reduction of NO, in gas turbine exhaust gases with NH, involves contacting the gases with the catalysts, preferably at 250-600°C.

Separation

SEPARATION Hydrocarbon

adsorbents

for exhaust July

gas treatment 19,1994;

Appl.

Dec. 28,

The hydrocarbon adsorbents comprise honeycomb supports coated with mixtures containing 22 zeolites having different crystal structures. Preferably, the mixtures contain powdered ZSM-5 zeolites and mordenite, Y, USY, and/or 6 zeolite powders. Alternatively, the adsorbents comprise honeycomb supports coated with zeolite slurries containing a-2 ZSM-5 zeolites having different SiO,/AI,O, ratios. The zeolite slurries may at least contain ZSM-5 zeolites having a SiO>/AI,O, ratio 2100 and ZSM-5 zeolites having a SiO$AI,O, ratio ~100.

Process

for treating

styrene-containing

J. Morlec; C. Travers; C. Dezael lnstitut Franqais du Petrole Eur. Pat. Appl. 613,715, Sept. 7, 1994;

ventilation

Fr. Appl.

Mar.

air

5, 1993

Ventilation air containing styrene is adsorbed on a hydrophobic zeolite containing Pt and/or Pd, and the treated air is released. The zeolite is then desorbed and combusted with hot gases.

Process

for sorption

R.K. Grasselli; R.M. Mobil Oil Corp. U.S. 5,349,117, Cont.-in part

Sept. 20, 1994; Appl. U.S. 5,310,714

July

8, 1992

of

This is a process for separating at least one component from a mixture of components which involves contacting the mixture with a sorbent structure comprising a film of interconnected zeolite crystals bonded to a substrate, the sorbent structure being characterized by a value rrepresenting the mg of zeolite/cm’ of substrate surface, wherein r is at least 0.5. The film is formed by contacting the substrate with a reaction mixture capable of forming the zeolite film under crystallization conditions, wherein the reaction mixture comprises a H,O/YO, molar ratio of at least about 25 when the YO,/X,O-, molar ratio is areater than about 400, a H,Or/O, ratio 03 ai least about 35 whkn the YO,/ X,0, ratio is greater than about 150 and less than about 400, and a ratio of at least about 45 when the YO,/X,O, ratio is less than about 150 (Y is a tetravalent element and X is a trivalent element). Application to separating hydrocarbons from each other and water is described; application to separating hydrocarbons from flue gases is indicated.

Separation

of (Y- and f3-monoisopropylnaphthalene

S. Aoki; T. Kato; H. Taniguchi et al. Nippon Kokan K.K. Jpn. Kokai Tokkyo Koho 94,219,972, 1993 Mixtures of the title compounds separation.

Aug.

are treated

Removing organic solvent vapor and gases by selective absorption T. Kuma; M. Shirahama Seibu Giken K. K.; Toshimi Kuma Jpn. Kokai Tokkyo Koho94,226,037,Aug. 1992

9, 1994; Appl. with

NaY zeolites

and humidity

16,1994;

Jan.

from

Appl.

22, for

air

Sept.

Air and gases are treated by rotating cylindrical honeycombs, having penetrating fine pores with powdered mesopore zeolite on the surface of the pore walls, to adsorb organic solvent vapor and humidity at an absorption zone and rotating the honeycomb

8,

94,239,808,

Aug.

30, 1994;

Appl.

Feb.

Y fau-

DETERGENTS Manufacture of free flowing high bulk density

particulate

detergents

with

T. Ishikawa; T. Inotsuka; S. Hashimoto et al. Lion Corp. Jpn. Kokai Tokkyo Koho 94,128,597; 94,128,598; 94,128.599, 10, 1994; Appls. Oct. 15 & 16, 1992 The title process involves stir mixing spray-dried products taining 21 anionic surfactant with water-soluble inorganic and aluminosilicates (zeolite 4A) followed by spraying nonionic surfactants and stir granulating.

E. Hoshino; Kao Corp. Jpn. Kokai 1992

R.F. Socha

K. Tada

The title compound is separated from methylnitrobenzotrifluoride isomeric mixtures with K-, Rb-, Cs-, or Ba-exchanged jasite-type zeolites as adsorbents.

Laundry

separation Lago;

of 2-methyl-3-nitrobenzotrifluoride

M. Morimoto; M. Suzuki; Tora y Industries Inc. Jpn. Kokai Tokkyo Koho 15, 1993

PROCESS

C. Hayashi; T. Ikeda; M. Kamikubo Nissan Motor Jpn. Kokai Tokkyo Koho 94,198,164, 1992

report

detergent

compositions

J. Kubota; Tokkyo

Koho

May consalts with

safe to cotton

Y. Wada 94,158,097,

June

7. 1994; Appl.

The title compositions contain cellulase ness index [=(hydrolysis rate of non- or lose)/hydrolysis rate of highly crystalline crystallrne layered M2S~,0,2x+ ,r wH,O (M c 4; w c 25).

Granular detergent compositions and solubility in cold water

with

Nov.

24,

with nondestructivelow-crystalline cellucellulose1 2500 and = alkali metal; 1.5 < x

high bulk density

T. Sugimoto; J. Yoneyama Lion Corp. Jpn. Kokai Tokkyo Koho 94,116,599, Apr. 26, 1994; Appl. Oct. 5, 1992 The title compositions are prepared from (A) alkali builders, (B) aluminosilicate salts, (C) anionic surfactants, and (D) fatty acid ester nonionic surfactants R’CO(OR2),0R3 (R’CO = C,, fun)saturated fatty acid residue; R* = C,, alkylene; R3 = C,, alkyl; n = 5-30) at C/D wt ratio 7-0.25 and C + D content IO-50% with simultaneous stirring and disintegration in a high speed granulator.

Laundry detergent compositions acids) as builder additives

containing

poly(amino

A. Du Vosel; G. Muratori; P. Colombo et al. fnnichem S.P.A. Eur. Pat. Appl. 612,842, Aug. 31, 1994; IT Appl. Feb. 24, 1993 The title compositions, useful in automatic washers and showing good primary and secondary detergency performance, contain surfactants, 5-50% zeolite A, 0.5-5% poly(amino acid) or salt (e.g., polyfaspartic acid Na salt)), and other components

Process for increasing tergent composition

the bulk density

of a granular

de-

P. Van Diik: J.L. Veaa: P.A.R.G. France Procter and Gamble co. PCT Int. Appl. 94,05,761, Mar. 17, 1994; Eur. Pat. Appl. Sept. 1, 1992 In the title process, which gives a product with high bulk d (especially >800 g/l), good dispensing properties, and good solubility, a particulate detergent composition having mean particle size >400 pm and bulk d 2600 g/l, is placed in a rotating drum or mixer, sprayed with a liquid (e.g., a mixture of nonionic surfac-

Zeolites

16:79-83,

1996

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