[Q&A] April 2, 2017
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Question: What pre-treatment processes are required for heterogeneous fresh catalysts before use? Why? Answer: Fresh catalysts must undergo two processes—dehydration and drying, as well as reduction—before use. (1) Since catalysts absorb a certain amount of water during production, transportation, and loading, this water not only affects the strength of the catalyst but also its activity, as well as the distribution of platinum metal during hydrogen reduction. Therefore, using nitrogen containing 3–5% oxygen for dehydration drying helps to remove moisture and burn off any residual oil gases in the system; it also enables the catalyst to be reactivated, ensuring that the platinum metal on the catalyst is well-dispersed during reduction. Dehydration drying is key to the successful reduction of catalysts. (2) Fresh catalysts are in an oxidized state, and platinum in this oxidized state is inactive; only platinum in its metallic state is active. Reduction involves converting the oxidized platinum in the catalyst into active metallic platinum under the action of H₂. Therefore, before using the fresh catalyst, it must undergo oxygen dehydration and reduction processes. http://bbs.hcbbs.com/static/image/hrline/4.gif The petrochemical deep processing edition – the event to share pictures of chemical equipment has started! A vast amount of wealth, along with HaiChuan coins, is waiting for you to claim! http://bbs.hcbbs.com/thread-1760733-1-1.html Summary post for the Petrochemical Deep Processing section’s 【Question of the Day】 – updated daily by the moderator. http://bbs.hcbbs.com/thread-1496481-1-1.html Summary post of Q&A sessions~~~ Updated continuously. http://bbs.hcbbs.com/thread-1761172-1-1.html Summary post of weekly topics in the Petrochemical Deep Processing section~~~ Updated continuously! http://bbs.hcbbs.com/thread-1751483-1-1.html Petrochemical Zone—New Ideas for Energy Saving: The “Creative Thinking” Campaign http://bbs.hcbbs.com/thread-1666758-1-1.html Xiaomi phones are waiting for you to claim them
Answer: Fresh catalysts must undergo two processes—dehydration and drying, as well as reduction—before use. (1) Since the catalyst absorbs a certain amount of water during production, transportation, and loading, this water not only affects the strength of the catalyst but also its activity, as well as the distribution of platinum metal during hydrogen reduction. Therefore, using nitrogen containing 3–5% oxygen for dehydration drying helps to remove moisture and burn off any residual oil gases in the system; it also enables the catalyst to be reactivated, ensuring that the platinum metal on the catalyst is well-dispersed during reduction. Dehydration drying is key to the successful reduction of the catalyst. (2) Fresh catalysts are in an oxidized state, and platinum in this oxidized state is inactive; only platinum in its metallic state is active. Reduction involves converting the oxidized platinum in the catalyst into metallic platinum that is active, under the action of H₂. Therefore, before using the fresh catalyst, it must undergo oxygen dehydration and reduction processes.
This post was last edited by zdl1966 on 2017-4-2 at 06:33. 1) Since catalysts absorb a certain amount of water during production, transportation, and loading, this water not only affects the strength of the catalyst but also its activity, as well as the distribution of metallic platinum during hydrogen reduction. Therefore, dehydration using hydrogen (with a standard of 200 ppm water content at the reactor outlet at 260°C) helps to remove moisture and burn off any residual oil and gas in the system. It also allows the catalyst to be dried again, ensuring that metallic platinum on the catalyst is well-dispersed during reduction. Dehydration is key to the successful reduction of catalysts. 2) Fresh catalysts are in an oxidized state, and platinum in this oxidized state is inactive; only platinum in its metallic state is active. Reduction involves converting the oxidized platinum in the catalyst into active metallic platinum under the action of H₂ (with a standard of 4 hours at a constant temperature of 315°C). Therefore, before using the fresh catalyst, it must undergo dehydration, drying, and reduction processes.
Fresh catalysts must undergo two processes—dehydration and drying, as well as reduction—before use
Fresh catalysts must undergo two processes—dehydration and drying, as well as reduction—before use. (1) Since catalysts absorb a certain amount of water during production, transportation, and loading, this water not only affects the strength of the catalyst but also its activity, as well as the distribution of platinum metal during hydrogen reduction. Therefore, using nitrogen containing 3–5% oxygen for dehydration drying helps to remove moisture and burn off any residual oil gases in the system; it also enables the catalyst to be reactivated, ensuring that the platinum metal on the catalyst is well-dispersed during reduction. Dehydration drying is key to the successful reduction of catalysts. (2) Fresh catalysts are in an oxidized state, and platinum in this oxidized state is inactive; only platinum in its metallic state is active. Reduction involves converting the oxidized platinum in the catalyst into active metallic platinum under the action of H₂. Therefore, before using the fresh catalyst, it must undergo oxygen dehydration and reduction processes.
Fresh catalysts must undergo two processes—dehydration and drying, as well as reduction—before use. Since the catalyst absorbs a certain amount of water during production, transportation, and loading, this water not only affects the strength of the catalyst but also its activity, as well as the distribution of platinum metal during hydrogen reduction. Therefore, using nitrogen containing 3–5% oxygen for dehydration drying helps to remove moisture and burn off any residual oil and gas in the system; it also enables the catalyst to be reactivated, ensuring that the platinum metal on the catalyst is well-dispersed during reduction. Dehydration drying is key to the successful reduction of the catalyst. Fresh catalysts are in an oxidized state, and oxidized platinum is inactive – only platinum in its metallic state is active. Reduction involves converting the oxidized platinum in the catalyst into active metallic platinum under the action of H2. Therefore, before using the fresh catalyst, it must undergo oxygen dehydration and reduction processes.
Fresh catalysts must undergo two processes—dehydration and drying, as well as reduction—before use. (1) Since the catalyst absorbs a certain amount of water during production, transportation, and loading, this water not only affects the strength of the catalyst but also its activity, as well as the distribution of platinum metal during hydrogen reduction. Therefore, using nitrogen containing 3–5% oxygen for dehydration drying helps to remove moisture and burn off any residual oil gases in the system; it also enables the catalyst to be reactivated, ensuring that the platinum metal on the catalyst is well-dispersed during reduction. Dehydration drying is crucial for the successful reduction of the catalyst. (2) Fresh catalysts are in an oxidized state, and platinum in this oxidized state is inactive; only platinum in its metallic state is active. Reduction involves converting the oxidized platinum in the catalyst into metallic platinum that is active, through the action of H₂. Therefore, before using the fresh catalyst, it must undergo oxygen dehydration and reduction processes.
Fresh catalysts must undergo two processes—dehydration and drying, as well as reduction—before use. Reason: 1. Since the catalyst absorbs a certain amount of water during production, transportation, and loading, this water not only affects the strength of the catalyst but also its activity, as well as the distribution of platinum metal during hydrogen reduction. Therefore, using nitrogen containing 3-5% oxygen for dehydration drying helps to remove moisture and burn off any residual oil gases in the system; it also enables the catalyst to be reactivated, ensuring that the platinum metal on the catalyst is well-dispersed during reduction. Dehydration drying is key to the successful reduction of the catalyst ； 2. Fresh catalysts are in an oxidized state, and platinum in its oxidized state is inactive; only platinum in its metallic state is active. Reduction involves reducing the oxidized platinum in the catalyst to its active metallic form using H₂. Therefore, before using the fresh catalyst, it must undergo oxygen dehydration and reduction processes.
Answer: Fresh catalysts must undergo two processes—dehydration and drying, as well as reduction—before use. (1) Since catalysts absorb a certain amount of water during production, transportation, and loading, this water not only affects the strength of the catalyst but also its activity, as well as the distribution of platinum metal during hydrogen reduction. Therefore, using nitrogen containing 3–5% oxygen for dehydration drying helps to remove moisture and burn off any residual oil gases in the system; it also enables the catalyst to be reactivated, ensuring that the platinum metal on the catalyst is well-dispersed during reduction. Dehydration drying is key to the successful reduction of catalysts. (2) Fresh catalysts are in an oxidized state, and platinum in this oxidized state is inactive; only platinum in its metallic state is active. Reduction involves converting the oxidized platinum in the catalyst into active metallic platinum under the action of H2. Therefore, before using the fresh catalyst, it must undergo oxygen dehydration and reduction processes.
Dehydration and drying, reduction, to maintain the catalyst’s activity