Catalysts for decomposing ammonia contained in waste gases

Patent

report

and/or potassium form of 20.20 cm3/g and a lithium cation exchange of 280%, preferably including an intergrowth with a crystalline FAU structure, where the pure or intergrowth compositions have the formulae: M,,,0.X,03.(2.0-c4.0)Si0,, or (0.20.0)M’,,,0.(0.80-1.0)Li,0.X,03.(2.0-c4.0)Si02 where M 2 1 metal cation having a valence of n, M’ z 1 metal cation other than lithium having a valence of n, and X is selected from aluminum, gallium, and boron, preferably aluminum.

CATALYSIS Zeolite pounds

catalyst for the manufacture from paraffin hydrocarbons

K. Takatsu; M. Sawa; J. Kanai ldemitsu Kosan Co. Jpn. Kokai Tokkyo Koho 95258,658, 1994

of aromatic

Oct. 9, 1995; Appl.

com-

Mar. 25,

The title catalyst contains two types of zeolite: a zeolite having SiOdM,,O ratio s200; and a zeolite having SiO,/MU,O ratio 200, where M is Ga and/or Zn and n is the valency of M. The catalyst is suitable for the manufacture of aromatic hydrocarbons from C,-,, paraffin hydrocarbons.

Cyclohexanone

oxime

Mar. 11, 1994

Hydrogen peroxide is generated by oxidation of a secondary alcohol, and the solution of the hydrogen peroxide in the secondary alcohol is used as the reaction medium for the ammoxidation of cyclohexanone by reaction with ammonium hydroxide in the presence of a titanium silicalite catalyst to produce cyclohexanone oxime, a caprolactam precursor. The ketone produced as a coproduct is recycled back to the secondary alcohol by hydrogenation.

Epoxidation catalyst

of olefins

using

a titania-titanosilicalite

L.T. Nemeth; T.P. Malloy; RR. Jones UOP Inc. U.S. 5,466,835, Nov. 14, 1995; Appl. Dec. 23, 1993 Cont.-in-part of U.S. 5,354,875 The epoxidation of olefinic compounds using hydroperoxides, especially aqueous solutions of H,O,, is effected in high yield and with good selectivity in the presence of a catalyst that is a mixture of small particles (average size ~0.5 p, preferably SO.3 p) of titania and a titanosilicalite. Small particle size is essential in a catalyst with good activity and selectivity. The catalyst mixture is prepared by impregnating small particles of high-purity TiO, with a Ti source, for example, titanocene or Ti butoxide, and a source of silica, for example, a silicate, in a solvent, heating to evaporate the solvent and cause crystallization of the titanosilicalite, and drying to form a solid.

Activation nol from

of zeolite benzene

catalysts

for the preparation

A.S. Kharitonov; G.I. Panov; G.A. Sheveleva et al. Boreskov Institute of Catalysis PCT Int. Appl. 95,27,560, Oct. 19, 1995; Rumanian Appl. 1994

of phe-

Apr. 12,

Treatment of zeolite catalysts (e.g., ZSM-5 or ZSM-11) with a water vapor-containing gas at 350-950°C increases the activity and useful life of the catalysts during the oxidation of benzene by nitrous oxide to give phenol.

Preparation of methylamines from methanol nia in the presence of mordenite catalyst

and ammo-

T. Kiyoura; S. Nakahara Mitsui Toatsu Chemicals, Inc. Eur. Pat. Appl. 681,869, Nov. 15, 1995; Jpn. Appl. May 11, 1994 A mordenite catalyst in which the length of the c axis of the mordenite crystals is at least twice the length of the a or b axis

90

Zeolites

18:89-93,

1997

high activity in the synthesis of methylamines and NH, and gives mainly MeNH, and Me,NH.

Two-stage catalytic toluene, and xylene

process for from naphtha

CD. Gosling; R.S. Haizmann UOP Inc. U.S. 5,472,593, Dec. 5, 1995; Appl.

producing

from

benzene,

Feb. 14, 1994

A hydrocarbon feedstock is reformed in a reaction zone containing a catalyst composed of a platinum-group metal and a nonacidic L zeolite, and the reformate is then isomerized in a reaction zone containing a catalyst composed of a platinum-group metal, a metal attenuator, and a refracton/ inorganic oxide to produce benzene, toluene, and xylene @TX). This two-stage process achieves high selectivity in producing a high-purity BTX product from naphtha.

FCC process fins

for producing

enhanced

C.H.M. Tsang; L.D. Neff; P.S.E. Dai Texaco Inc. U.S. 5,472,594, Dec. 5, 1995; Appl. July

yields

of C,/C,

ole-

18, 1994

A process for converting a hydrocarbon feedstock to a product containing improved yields of C.&s olefins with a reduction in the loss of gasoline yield involves contacting the feedstock in an FCC reaction zone with a catalyst composed of a phosphoruscontaining medium-pore zeolite mixed a Y zeolite.

production

J.G. Zajacek; J.C. Jubin; G.L. Crocco Arco Chemical Technology, L.P. U.S. 5,451,701, Sept. 19, 1995; Appl.

shows MeOH

Catalyst for the alkylation compounds

or transalkylation

G. Girotti; 0. Cappellazzo Enichem Synthesis S.p.A. Eur. Pat. Appl. 687,500, Dec. 20, 1995; Italian

of aromatic

Appl. June

16,1994

A catalyst is described for the alkylation or transalkylation of aromatic compounds consisting of zeolite 8, or zeolite 8 modified by the isomorphic substitution of aluminum with boron, iron, or gallium, or by the introduction of alkali or alkaline earth metals by ion exchange.

Conversion

of hydrocarbons

with

K. Takatsu; M. Sawa; J. Kanai ldemitso Kosan Co. Jpn. Kokai Tokkyo Koho 95,278,567, 1994

zeolite

catalysts

Oct. 24, 1995; Appl.

Apr. 6,

A process for the conversion of hydrocarbons involves using a synthetic MFI zeolite as the catalyst prepared by heating a reaction mixture having mol ratios SiO,/AI,O, 20-200, SiO,/Ga,O, 5 200, H,O/SiO, 30-50, and R/SiO, O-O.1 (R is an organic component selected from Clb alcohols, amines, and aminoalcohols).

Catalysts gases

for decomposing

ammonia

contained

S. Nojima; R. Tokuyama; K. lida Mitsubishi Jukogyo Kabushiki Kaisha Eur. Pat. Appl. 686,423, Dec. 13, 1995; Jpn. Appl.

in waste

June

8, 1994

Catalysts for the decomposition of ammonia in waste gases contain a crystalline aluminosilicate as a carrier having the formula (1 + 0.8)R,0.[aM,0,.6M’0.cAl,O,].ySi0, (where R is an alkali metal ion and/or a H ion; M is a group-VIII metal, a rareearth metal, Ti, V, Cr, Nb, Sb, or Ga; M’ is Mg, Ca, Sr, or Ba; a 2 0;20>b~O;a+c=1;3000~y~11);andIrasanactivemetal, and optionally a second catalyst having Bl of Ti, V, W, and MO.

Process for the preparation and alkyl esters

of branched-chain

T. Tomifuji; H. Abe; Y. Matsumura et al. Kao Corp. Eur. Pat. Appl. 683,150, Nov. 22, 1995; Jpn. Appl.

fatty

acids

May 18, 1994

A process for preparing branched-chain fatty acids or alkvl es. fatty acids, alkyl ters rnvolves a step In whrch C,s25 unsaturated esters, ortheir mixtures are subjected to a skeletal isomerization