【Q&A Question 197】2018.07.22
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【Q&A Question 197】July 22, 2018: Briefly describe what types of stability a catalyst should possess Stability required of a catalyst: ① Chemical stability—maintaining a stable chemical composition and state. ②Thermal stability — the ability to maintain its physicochemical properties under reaction conditions without being damaged by heat, while also retaining good stability within a certain range of temperature changes. ③ Mechanical stability — possessing sufficient mechanical strength to ensure that the reaction bed is under appropriate hydrodynamic conditions. ④ Activity stability—adequate resistance to toxins, allowing for a long service life. . (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
Chemical stability, mechanical stability, thermal stability, reactivity stability
Chemical stability, thermal stability, mechanical stability, and sufficient resistance to toxins.
Answer: The stability of a catalyst is usually expressed in terms of its lifetime, which refers to the time during which the catalyst maintains a certain level of activity under operating conditions (single-pass lifetime), or the cumulative time required for it to return to an acceptable level of activity after each decline due to regeneration (total lifetime). The stability of a catalyst includes thermal stability against high-temperature effects, mechanical stability against friction, impact, and gravity, and resistance to poisoning by toxic substances ； In addition, there is also the anti-degradation stability against coking and carbon deposition, as well as chemical stability under reaction conditions.
The stability of a catalyst includes thermal stability against high-temperature effects, mechanical stability against friction, impact, and gravity, and resistance to poisoning by toxic substances； In addition, there is also the anti-degradation stability against coking and carbon deposition, as well as chemical stability under reaction conditions.
1. Chemical stability – maintaining a stable chemical composition and state of combination. 2. Thermal stability – remaining free from changes in its physical-chemical properties under reaction conditions due to heat, while also preserving good stability within a certain range of temperature variations. 3. Mechanical stability – It must possess sufficient mechanical strength to ensure that the reactor is under appropriate hydrodynamic conditions. 4. It has sufficient resistance to poisons.
①Chemical stability—maintaining a stable chemical composition and state of combination. ②Thermal stability — the ability to maintain its physical and chemical properties under reaction conditions without being damaged by heat, while also retaining good stability within a certain range of temperature changes. ③Mechanical stability — possessing sufficient mechanical strength to ensure that the reactor is under appropriate hydrodynamic conditions. ④Has sufficient resistance to poisons
(1) Chemical stability -- maintaining a stable chemical composition and state of combination. (2) Thermal stability -- the ability to maintain its physical and chemical properties under reaction conditions without being damaged by heat, while also retaining good stability within a certain range of temperature changes. (3) Mechanical stability -- possess sufficient mechanical strength to ensure that the reaction bed is under appropriate hydrodynamic conditions. (4) It has sufficient resistance to poisons.
(1) Chemical stability -- maintaining a stable chemical composition and state of combination. (2) Thermal stability -- the ability to maintain its physical and chemical properties under reaction conditions without being damaged by heat, while also retaining good stability within a certain range of temperature changes. (3) Mechanical stability -- possess sufficient mechanical strength to ensure that the reaction bed is under appropriate hydrodynamic conditions. (4) It has sufficient resistance to poisons.
Chemical stability； Thermal stability ； Mechanical stability ； Active stability