[Q&A Question 089] 2018.03.30
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【Q&A Question 089】March 30, 2018: Briefly explain why a nitrogen atmosphere is used instead of a hydrogen atmosphere during the drying process of catalysts. If hydrogen is used for drying and the drying temperature exceeds 200°C, the active oxides on the catalyst will be reduced by hydrogen to form lower-valent metal oxides or metals. This creates difficulties in the subsequent presulfurization step, as the reduced metals are difficult to sulfure, thereby reducing the catalyst’s activity. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Due to the limitations on the number of posts in the “One Question per Day” section, “One Image per Day” has been moved to the registered devices section; you can access it through the directory I posted. For management purposes, if you need to access content from a few days ago, please go to the summary post below to enter the “My Registration Season” event – (Note: This event is currently underway in the Chemical Engineering section). https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=18978 For the daily questions section related to chemical engineering technology training in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971 For the daily image section related to registration equipment in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888970 For the Q&A section related to hydrogen production and hydrogenation technologies in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888968 For the daily questions section related to LNG technology in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888973 For the Q&A section from 2017 (updates have started): https://bbs.hcbbs.com/thread-1657793-1-1.html For the daily questions section from 2017 (updates have started): https://bbs.hcbbs.com/thread-1657794-1-1.html For the daily image section from 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160 For the list of daily questions related to LNG in 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162 For the Q&A section from 2016 (updates are complete): https://bbs.hcbbs.com/thread-1597792-1-1.html
During the catalyst drying process, if hydrogen is used as the drying medium and the drying temperature exceeds 200°C, the active oxides on the catalyst will be reduced by hydrogen to form less valuable metal oxides or metals. This creates difficulties in the subsequent pre-sulfidization step, as the reduced metals are difficult to sulfide, thereby reducing the catalyst’s activity.
Answer: During the catalyst drying process, if hydrogen is used as the drying medium and the drying temperature exceeds 200 degrees Celsius, the metallic oxides on the catalyst will be reduced by hydrogen to form lower-valent metals. This creates difficulties in the subsequent presulfidization step, as the metals resulting from this reduction are difficult to sulfide, thereby reducing the catalyst’s activity.
During the catalyst drying process, if hydrogen is used as the drying medium and the drying temperature exceeds 200°C, the active oxides on the catalyst will be reduced by hydrogen to form less valuable metal oxides or metals. This creates difficulties in the subsequent pre-sulfidization step, as the reduced metals are difficult to sulfide, thereby reducing the catalyst’s activity.
This post was last edited by “The Moon is Round in My Hometown” on March 30, 2018, at 09:46. During the drying process of catalysts, if hydrogen gas is used as the drying medium and the drying temperature exceeds 200°C, the active oxides on the catalyst will be reduced by hydrogen to form lower-valent metal oxides or metals. This poses difficulties in the subsequent presulfurization step, as the reduced metals are difficult to sulfide, thereby reducing the catalyst’s activity.
Nitrogen is an inert gas that does not react with catalysts, while hydrogen has a strong reducing ability and therefore reacts with catalysts
During the catalyst drying process, if hydrogen is used as the drying medium and the drying temperature exceeds 200°C, the active oxides on the catalyst will be reduced by hydrogen to form less valuable metal oxides or metals. This creates difficulties in the subsequent presulfurization step, as the reduced metals are difficult to sulfurize, thereby reducing the catalyst’s activity.
Nitrogen is an inert gas that does not react with catalysts, while hydrogen has a strong reducing ability and therefore reacts with catalysts
Nitrogen is an inert gas that does not react with catalysts, whereas hydrogen has a strong reducing ability and can react with catalysts. During the catalyst drying process, if hydrogen is used as the drying medium and the temperature rises above 200°C, the active oxides on the catalyst will be reduced by hydrogen to form less active metal oxides or metals. This creates difficulties in the subsequent presulfurization step, as the reduced metals are difficult to sulfure, thereby reducing the catalyst’s activity.
Nitrogen is an inert gas that does not react with catalysts, while hydrogen has a strong reducing ability and therefore reacts with catalysts