Converting light-olefins

Patent diol. This method allows preparation temperatures and with smaller crystallite by conventional techniques.

of the zeolites at lower size than can be achieved

zeolite support a second metal selected from a transition metal other than Zn or a rare earth metal, the second metal being in unreduced ionic form, the Group VIII catalyst metal being in reduced zero valent form; both of the metals while in ionic form are incorporated in the zeolite support by ion-exchange. The unreduced ionic metal has a substantially more negative ion reduction potential than the catalytic metal and is associated in ionic form with the exchange sites of the zeolite. The atomic ratio of the unreduced metal ions to the reduced catalytic metal is > 0.2. The catalyst metal is selected from Pt, Ni, Co, Rh, Pd, and Ir. The unreduced metal ions are selected from Fe, Cr, Mn, V, Ti, Th, Nd, Ce, La, and Y ions.

CATALYSIS Control

of inlet pore diameter

of zeolite

catalyst

Y. Murakami; A. Furuta; H. Ito; S. Okada JGC Corp. Jpn Kokai Tokkyo Koho 87,52,123; 8752,124; 1987; Appls. Aug. 28, 1985

87,52,125,

Mar.

6,

Catalytic

Zeolite adsorbents or catalysts with improved selectivity are prepared by depositing SiOz on a zeolite support by a vapor-deposition process using a silanization agent under fluidized conditions. The zeolite is pretreated with a Nz-containing organic compound (e.g., n-butylamine or pyridine) to regulate the amount of SiOz deposition and control the inlet pore diameter of the zeolite.

Selective

catalysts

for preparation

of olefins

M. Weber; K. Becker; H. D. Berrouschot VEB LeunaWerke I Walter Ulbricht ” E. Ger. 238,733; 238,736, Sep. 3, 1986;

et al. Appls.

Dec.

29,

1984

Catalysts exhibiting high selectivity to olefins containing 2 3 C in the *conversion of MeOH and/or Mel0 to olefins comprise a binder (SiOz and/or Alz03) and a zeolite, e.g., zeolite LZ-40, which contains 2 25 mol SiOz/mol Alz03 and is ion-exchanged in an alkaline medium with Group IIA cations.

Catalysts carbons

for

selective

K. Hashimoto; T. Masuda; Toyo Soda Mfg. Co. Ltd. Jpn Kokai Tokkyo Koho 1985

conversion

of paraffin

hydro-

K. lgawa 86,263,645,

Nov.

21,

1986;

Appl.

May

Mobil Oil Jpn Kokai

Koho

cracking

86,220,739,

Oct.

catalysts

1, 1986;

Appl.

Mar.

25, 1985

Fluidized cracking catalysts, especially for gasoline production from high-sulphur heavy oils, are prepared by blending a rare-earthexchanged Y-type zeolite with a silicate-containing basic solution and an AlpOa-containing acidic solution to give a gel (pH 34.5), which is pelletized, dried by air blowing, and calcined to obtain a high-density product (SiOz/Alz03 mol ratio s 12:l).

Improved

Fischer-Tropsch

J. C. W. Kuo; W. 0. Haag; Mobil Oil Corp. U.K. Pat. Appl. 2,179,670,

process P. B. Weisz

Mar.

11, 1987;

U.S.

Appl.

Aug.

29,

1985

Fischer-Tropsch synthesis in a fluid mode produced increased diesel and heavier hydrocarbon products with a mixture of a synthesis catalyst and a minor amount (2-20%) of a zeolite (e.g., ZSM-5 zeolite). The zeolite catalyst selectively converts much of the waxy product to prevent adhesion between catalyst particles, resulting in maximum production of diesel fuel and heavy hydrocarbons and a maintained catalyst fluidity in the reactor.

Dispersion-enhanced

metal/zeolite

W. M. H. Sachtler; M. S. Tzou; Northwestern University U.S. 4,654,317, Mar. 31, 1987; A porous crystalline zeolite Group VIII metal is improved

catalysts

H. J. Jiang Appl.

July

3, 1985

catalyst containing by having ionically

processes

Appl.

Aug.

14, 1986

Hydrocarbon feedstocks (b.p. S 400°C. preferably heavy gas oils and hydrotreated residues) are catalytically cracked to gasoline in the presence of a faujasite-type catalyst (pore size 24.28-24.4.8 A) containing e 0.5 wt.% of alkali metals and having no Fe ions. Preferably, the faujasite-type zeolite has an atomic ratio of 8-21:l Si:AI, and is partially dealuminated by steam treatment, followed by acid leaching.

Catalytic

dealkoxylation

D. Arntz; M. Baacke; Degussa A.-G. Ger. Offen. 3,535,128,

of geminal

P. Kleinschmidt Apr.

2, 1987;

dialkoxy

compounds

et al. Appl.

Oct.

2, 1985

In the catalytic dealkoxylation of R’RzCHCY(OR3)z (R’, R2 = C1-3 alkyl, an/l, H; R3 = Me, Et; Y = H, Me) at elevated temperature in the gas phase on a Na-exchanged zeolite catalyst to give R’R2C:CYOR3, mordenite or ZSM-5 zeolites are used, with a NazO-A1203 ratio of 1:1.5 (+ 0.25).

lsomerization

of high-density Corp. Tokkyo

cracking

C. M. Fu Phillips Petroleum Co. U.S. 4,663,025, May 5, 1987;

17,

Zeolite Y (with Na20-A1203 mol ratio (A) 5 0.2:1 and lattice constant 24.2-24.5 A) was treated with aqueous Na salts to change A to O&0.9:1, impregnated with solutions of Group VIII metals, dried, heated and reduced by H to deposit 0.1-l .O% metal to give the title catalysts. The catalysts are useful for reforming, isomerization, and aromatization of paraffin hydrocarbons.

Preparation

Report

a finely dispersed dispersed in the

catalyst

for alkyl aromatic

compounds

S. Vishnoi; S. Sivasankar; P. Ratnasamy Council of Scientific and Industrial Research (India) Indian P. 158,462, Nov. 22, 1986; Appl. Oct. 23, 1982 The title catalyst is prepared by treating dealuminated crystalline Na mordenite with an aqueous ammonium salt solution to obtain crystalline ammonium mordenite, calcining this material, treating the calcined product with a Pt salt solution and then with an aqueous Ca salt solution and calcining to obtain a dealuminated crystalline Ca-Pt-H-mordenite.

Manufacture

of carbonyl

sulphide

from

waste

products

W. Lutz; P. Fellmuth; M. Buelow et al. VEB Chemie-und Tankanlagenbau Fuerstenwalde E. Ger. 241,245, Dec. 3, 1986; Appl. Sep. 30, 1985 The manufacture of COS from wastes from the purification of gases, e.g., sour gas, in which HzS and COz are catalytically converted, is carried out by using a natural or synthetic zeolitic catalyst that also functions as an adsorbent for water, e.g., zeolite A or X, that is exchanged by alkali metals, alkaline earth metals, or divalent metals of the subgroups of the periodic system.

Converting

light-olefins

C. T. W. Chu; E. W. Valyocsik Mobil Oil Corp. U.S. 4,665,250, May 12, 1987;

Appl.

Feb.

24, 1986

Lower olefins are converted to gasoline, distillate and lube-range hydrocarbons with an acidic zeolite ZSM-48, having a composition: (0.06-5)Rz0:(0.1-10)Xu,0:(0.2-1)M203:(100)Si02, where R is a cation derived from a mixture of a Cz-,* alkylamine, a tetramethyIammonium compound, or a linear diquaternary ammonium compound; X is a cation of valence n; Mz03 is the oxide of P 1 metal selected from Al, Ga, and Fe. The properties of a lubricating base oil were significantly improved compared with those achieved by conversion over ZSM-5.

ZEOLITES,

1988, Vol8,

March

161