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1. WO1996004074 - PROCESS FOR PREPARING SILVER CATALYST

Publication Number WO/1996/004074
Publication Date 15.02.1996
International Application No. PCT/US1994/008833
International Filing Date 04.08.1994
Chapter 2 Demand Filed 12.09.1994
IPC
B01J 23/50 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
23Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/113
38of noble metals
48Silver or gold
50Silver
B01J 23/66 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
23Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/113
38of noble metals
54combined with metals, oxides or hydroxides provided for in groups B01J23/02-B01J23/36118
66Silver or gold
B01J 37/02 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
37Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
02Impregnation, coating or precipitation
C07D 301/10 2006.01
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
DHETEROCYCLIC COMPOUNDS
301Preparation of oxiranes
02Synthesis of the oxirane ring
03by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds
04with air or molecular oxygen
08in the gaseous phase
10with catalysts containing silver or gold
CPC
B01J 23/50
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
23Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
38of noble metals
48Silver or gold
50Silver
B01J 23/66
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
23Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
38of noble metals
54combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
66Silver or gold
B01J 35/1009
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
35Catalysts, in general, characterised by their form or physical properties
02Solids
10characterised by their surface properties or porosity
1004Surface area
1009less than 10 m2/g
B01J 35/1038
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
35Catalysts, in general, characterised by their form or physical properties
02Solids
10characterised by their surface properties or porosity
1033Pore volume
1038less than 0.5 ml/g
B01J 35/1076
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
35Catalysts, in general, characterised by their form or physical properties
02Solids
10characterised by their surface properties or porosity
1052Pore diameter
1076larger than 1000 nm
B01J 37/0203
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
37Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
02Impregnation, coating or precipitation
0201Impregnation
0203the impregnation liquid containing organic compounds
Applicants
  • SCIENTIFIC DESIGN COMPANY, INC. [US/US]; 49 Industrial Avenue Little Ferry, NJ 07643-1901, US
Inventors
  • RIZKALLA, Nabil; US
Agents
  • JOHNSON, Kenneth, H.; P.O. Box 630708 Houston, TX 77263, US
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PROCESS FOR PREPARING SILVER CATALYST
(FR) PROCEDE DE PREPARATION D'UN CATALYSEUR A BASE D'ARGENT
Abstract
(EN)
An improved silver catalyst for the oxidation of ethylene with molecular oxygen is made by impregnating a porous support with a silver salt of an acid; subjecting the impregnated support to a multi-stage activation in an atmosphere containing less oxygen than air by heating at a first temperature in the range of 150 to 200 °C for less than an hour, heating at a second temperature in the range of from greater than 200 °C to 300 °C for less than one hour, heating at a third temperature in the range of from greater than 300 °C to 400 °C for less than one hour and finally heating at a fourth temperature in the range of from greater than 400 °C to 500 °C; and post impregnating the support with an alkali metal, preferably cesium, from an anhydrous alcohol solution followed by washing with alcohol solvent and rapid drying to produce a finished catalyst having from 1-6 x 10-3 gew of the alkali metal per kg of catalyst.
(FR)
On obtient un catalyseur amélioré à base d'argent, qui permet d'oxyder l'éthylène avec de l'oxygène moléculaire, en imprégnant un support poreux avec un sel d'argent provenant d'un acide, en soumettant le support imprégné à une activation en plusieurs étapes dans une atmosphère contenant moins d'oxygène que l'air en le chauffant à une première température située entre 150 et 200 °C pendant moins d'une heure, à une deuxième température située entre 200 et 300 °C pendant moins d'une heure, à une troisième température située entre 300 et 400 °C pendant moins d'une heure, et en le chauffant enfin à une quatrième température située entre 400 et 500 °C. On imprègne ensuite ce support avec un métal alcalin, du césium de préférence, provenant d'une solution d'un alcool anhydre, puis en le lavant avec un solvant à base d'alcool et en le séchant rapidement pour produire un catalyseur fini qui présente 1 à 6x10-3 gew du métal alcalin par kg de catalyseur.
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