Discussion on hydrogen production catalysts
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There are many types of hydrogen production catalysts: hydrogenation catalysts, desulfurization catalysts, pre-conversion catalysts, conversion catalysts, shift catalysts, and adsorbents； If you would like to learn more about catalysts in various aspects, please feel free to share your thoughts; there will be rewards for those who do so. 1. Hydrogenation catalyst manufacturers can supply those in oxidized and sulfided states – what are the advantages and disadvantages of each? 2. There are precision desulfurization catalysts; ignoring cost, is copper oxide better or zinc oxide better? Why? 3. What are the advantages and disadvantages of the oxidized and reduced states of the pre-conversion catalyst? 4. Is an anti-carbon deposition catalyst usually installed at the upper part of the converter? Does a process with pre-conversion also require a catalyst to prevent carbon deposition? 5. Is the medium variant suitable for operation with sulfur release or without sulfur release?
1. In-vessel and out-of-vessel pre-sulfurization shorten the start-up period and prevent the impact of reaction heat on the catalyst
Answer to Question 1: 1. Compared with oxidized-state catalysts, sulfided-state catalysts exhibit essentially comparable desulfurization and denitration activities at startup. The startup process for sulfided catalysts is simple, fast, and reduces costs. To get the oxidation state catalyst operational, it is necessary to undergo steps such as catalyst drying, pre-sulfurization, and system purging, a process that takes 66 hours. To start operating a sulfided catalyst, it only requires hydrogen activation of the catalyst before feed oil can be introduced, and the process takes 18 hours. The startup time was reduced by 48 hours compared to oxidation-state catalysts. 2. Eliminate physical hazards and environmental pollution. No vulcanizing agents were used during the production process, thereby avoiding environmental pollution caused by these agents during storage and use. 3. Soot oil discharge is reduced.
4. Is an anti-carbon deposition catalyst usually installed at the upper part of the converter? Does a process with pre-conversion also require a catalyst to prevent carbon deposition? The upper catalyst transformation zone has a high content of KO and exhibits carbon resistance. 5. Is it applicable for medium-temperature shift catalysts that require sulfur release during operation or those that do not need such release? Sulfur release occurs alongside the reduction process of medium-temperature shift catalysts