# US 5,703,001 A · Promoted silver catalyst

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- Number: US 5,703,001 A
- Document ID: US5703001A
- Status: Granted
- Kind: A
- Application number: 08/738,042
- Filed: 1996-10-25
- Granted: 1997-12-30
- Earliest claimed: 1996-10-25
- Assignees: Scientific Design Company, Inc.
- Inventors: Nabil Rizkalla
- Web page: https://patentgrep.com/patent/US5703001A

## CPC

- C07D 301/10: with catalysts containing silver or gold
- B01J 23/66: Silver or gold
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

A rhenium free supported silver catalyst for ethylene oxidation to ethylene oxide is provided containing an alkali metal promoter component and a Group 4b component in which the Group 4b component is added as a compound where the Group 4b compound is the cation.

## Claims

### Claim 1

A rhenium-free catalyst for the oxidation of ethylene to ethylene oxide comprised by weight of 5-30% silver on a solid alumina support having a surface area of 0.2-2.0 m.sup.2 /g and containing a promoting amount of (1) an alkali metal component and (2) a Group 4b component wherein the Group 4b component is added as a compound having a Group 4b cation.

### Claim 2 (depends on 1)

The catalyst of claim 1 wherein the alkali metal component is cesium and the Group 4b component is zirconium.

### Claim 3 (depends on 1)

The catalyst of claim 1 wherein the alkali metal component is cesium and the Group 4b component is hafnium.

### Claim 4 (depends on 1)

The catalyst of claim 1 wherein the alkali metal component is cesium and the Group 4b component is titanium.

### Claim 5 (depends on 1)

The catalyst of claim 1 also containing sulfur as a promoting component.

### Claim 6 (depends on 1)

The catalyst of claim 1 also containing fluorine as a promoting component.

### Claim 7 (depends on 1)

The process for the preparation of ethylene oxide which comprises reacting ethylene and molecular oxygen in the presence of the catalyst of claim 1.