Nitric Acid Metal Gauzes
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Nitric acid metal gauzes are used in a number of applications. These include venipuncture sites and the application of medical devices. However, some drawbacks have been associated with this material. Firstly, the loss of platinum alloy from the wire surface and its catalytic oxidation to nitrogen oxide.
Catalytic oxidation of ammonia to nitrogen oxide
Catalytic oxidation of ammonia to nitric acid is the principal technique used for nitric acid production. It is a greenhouse gas-intensive process.
Ammonia oxidation can be carried out using several techniques. The most important is the catalytic oxidation of ammonia over a metal gauze catalyst. This type of catalyst is usually composed of precious metal fine wires knitted on a loom. However, this type of catalyst can fail due to channeling and poor start-up.
A typical ammonia oxidation catalyst gauze has approximately 1.78 troy ounces of platinum per square foot. Rhodium is commonly used to improve the mechanical properties of the gauze. In addition, ruthenium is alloyed to increase its high temperature strength.
Rhodium-platinum alloy gauzes yield the best results for complete conversion to nitric acid. When heated, they glow.
An ammonia oxidation demonstration experiment shows heterogeneous catalytic oxidation of ammonia. The demonstration illustrates the Sabatier principle. During operation, ferric oxide accumulates on the metal gauze.
Loss of platinum alloy from the wire surface
The use of platinum catalyst gauzes has been an important topic of research for many years. These gauzes have been used in catalytic oxidation of ammonia and air. This oxidation process is used for manufacturing nitric acid. Other substances such as fertilizers are obtained from nitric acid. However, the amount of platinum alloy lost from the gauze surface during the process is very high.
To reduce the amount of platinum loss, a palladium alloy was incorporated into the gauze. Palladium helps to absorb platinum from the gas stream. It also decreases the formation of PtO2. As a result, the weight loss per unit area is less. In addition, the palladium concentration is increased.
The composition of the PPR#2 gauze was changed after 384 days of operation. At this time, the platinum loss rate was 0.044 gram ton-1 of nitric acid at atmospheric pressure. This was less than the rate of 0.061 gram ton-1 for PPR#1 gauzes. Moreover, the ammonia consumption was reduced by about 3-7 percent.
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Our experts will ensure your nitric acid plant is safely and reliably cleaned down in the fastest manner possible. We provide comprehensive service to maintain your plant’s quality.
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We understand that it’s important to keep up with the latest trends in green energy and recycling, which is why we offer solutions that comply with all environmental regulations.
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Please contact LCR to discuss how we can help you to recover your lost PGMs.
London Chemicals & Resources Limited (LCR) is proud to announce its partnership with AGR S.A. in a new spent catalyst processing facility AGR Catalyst Recovery (AGR-CR). This new facility already has licenses and permits in place and is located in Logrezana, between Aviles and Gijón in the Principality of Asturias in northern Spain, the administrative and commercial centre for the region.
Building and construction work commenced in 2018 and the company was officially launched in 2020. We utilise the latest technology for processing spent catalysts, originating mainly from the European oil and gas industry, which are finally recycled to produce chemicals and ferro-alloys and returned to the industry.
London Chemicals & Resources Ltd is proud that AGR-CR will create many new jobs for the local community over the coming years.
At full capacity, the facility will be roasting many thousands of tonnes per year of spent catalyst arising from catalytic processes such as hydrodesulfurization (HDS), hydrodemetallization (HDM) and hydrocracking (HC). These spent catalysts include VMoNi, NiMo, CoMo and NiW.
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