Catalyst
This up-to-date catalytic system produced by the company and
designed for ammonia oxidation in units for nitric acid and hydroxylamine
production is made of a number of gauzes:
• catalyst
gauzes;
• catchment
gauzes;
• separating
gauzes (which are used for catchment gauzes separation and prevent their
agglomeration during operation).
For this purpose, gauzes made of precious metals are used,
which different from each other by:
• alloy
grades;
• density
of weaving and knitting (for woven and knitted gauzes);
• diameter
of the wire used;
• mechanical properties.
Work to reduce losses of precious metals during operation,
improve gauze conversion, reduce waste processing time and manufacturing of
finished products is continuously being carried out.
The primary advantages of the technology being developed for
catalyst gauze production are as follows:
• catalyst
alloys with a reduced platinum content;
• electrochemical
activation of the catalyst surface for rapid ignition;
• unique PdW-5 alloy containing special additives for catchment gauzes;
• electrochemical activation of the catchment gauzes to reduce addition and losses of precious metals.
|
Alloy |
Wire diameter, mm |
Mesh size, mm |
Mesh/cm2 |
|
Catalyst
gauze - woven |
|||
|
PtRh92.5-7.5 |
0.092 |
0.22 |
1024 |
|
PtPdRh92.5-4-3.5 |
0.092 |
0.22 |
1024 |
|
PtPdRhRu81-15-3.5-0.5 |
0.076 |
0.236 |
1024 |
|
Catalyst gauze -
knitted |
|||
|
PtRh95-5 |
0.092 |
- |
- |
|
PtRh92.5-7.5 |
0.092 |
- |
- |
|
PtPdRh92.5-4-3.5 |
0.092 |
- |
- |
|
PtPdRhRu81-15-3.5-0.5 |
0.076 |
- |
- |
|
Separating gauze |
|||
|
Fe72Cr23Al5 |
0.25 |
0.5 |
- |
|
Fe71Cr23Al5Ti |
0.4 |
1 |
- |
|
Catchment/getter
gauze |
|||
|
PdW-5 |
0.09 |
0.222 |
1024 |
|
PdW-5
(Pt coating) |
0.076 |
0.236 |
1024 |
|
PdW-5
(Pt coating) |
0.12 |
0.349 |
453 |
