【Basic Knowledge Activity】In the petrochemical industry, what are the changes in catalysts from the initial to the final stage, as part of the ‘basic knowledge’ related to this field?
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This post was last edited by Adventure Dog on 2016-3-6 at 17:54. What are the changes in a catalyst from its initial state to its final state? During use, phenomena such as coking and carbon deposition on the catalyst surface, deposition of metals and ash on it, metal aggregation, as well as changes in crystal size and shape occur. As a result, its activity and selectivity gradually decline. To meet the desired purification requirements and levels of cracking conversion, it is necessary to increase the operating temperature over time in order to compensate for this decline in activity and selectivity. Correct answer +5 wealth; In-depth discussion +10 wealth. ============================================== Discussion on the two-stage catalytic cracking process: http://bbs.hcbbs.com/thread-1560503-1-1.html (Source: Haichuan Chemical Industry Forum). [Petroleum and Chemical Engineering Section] Compilation of professional “basic knowledge” posts (supported by the main forum; amazing prizes await you): http://bbs.hcbbs.com/thread-1557057-1-1.html (Source: Haichuan Chemical Industry Forum). This initiative encourages various sections to organize or individuals to publish posts on basic knowledge topics (the content can be gathered from the Internet or created originally; participation can take place through multiple themes, with no restrictions on the way in which it is done – it could be an explanation of a noun or an introduction to a series of principles). What are some suggestions and methods for getting in touch with cleaners? The regular administrator will reward the content that performs excellently. You will also be rewarded for regions where the activities are more intensive. (Regions should also conduct summarization and optimization based on the amount of such content available in their area.) ———————————————— The second phase of the event runs from February 20, 2016, to the end of June 2016; at least 50 award vouchers are available for you to claim (mugs, power banks, USB drives, and other prizes or event benefits). Prizes are awarded at any time based on performance, and additional rewards are given as well at any time depending on performance. (12,000 event points and rewards await those regions that perform well)
During use, the catalyst experiences phenomena such as coking and carbon deposition on its surface, metal deposition on the catalyst, metal aggregation, as well as changes in crystal size and shape. Due to factors like coking and carbon deposition, its activity and selectivity gradually decline. To meet the desired purification requirements and the level of cracking conversion, it is necessary to compensate for this decline in activity and selectivity by gradually increasing the operating temperature.
What changes occur in the catalyst from its initial state to its final state? As the catalyst’s activity decreases, it becomes necessary to increase the temperature at the furnace outlet; once the highest temperature that the catalyst can withstand is reached, that marks the end of its useful life.
As the catalyst is used over time, ash and metal deposits, coking, and carbon buildup form on its surface; its shape and volume also change. This leads primarily to a decrease in activity and selectivity, thereby reducing the yield of the product. One of the key factors in determining the cycle for major overhauls of refinery equipment is the service life of the catalysts.
During use, the catalyst experiences phenomena such as coking and carbon deposition on its surface, deposition of metals and ash on it, metal aggregation, as well as changes in crystal size and shape. As a result, its activity and selectivity gradually decline. To meet the desired purification requirements and the level of cracking conversion, it is necessary to compensate for this decline in activity and selectivity by gradually increasing the operating temperature
This will lead to coking and carbon deposition on the catalyst surface, metal deposition on the catalyst, metal aggregation, as well as changes in crystal size and shape.
Reasons such as reduced activity, decreased selectivity, and lower mechanical strength arise from poisoning, coking, crushing, loss of active centers, and other issues that occur in catalysts over time
During use, the catalyst experiences phenomena such as coking and carbon deposition on its surface, metal deposition on the catalyst, metal aggregation, as well as changes in crystal size and shape. Due to factors like coking and carbon deposition, its activity and selectivity gradually decline. To meet the desired purification requirements and the level of cracking conversion, it is necessary to compensate for this decline in activity and selectivity by gradually increasing the operating temperature.
The catalyst exhibits high activity at the beginning and low activity at the end, requiring an increase in temperature to compensate for this
During use, carbon deposition occurs on the catalyst surface, and metals and ash precipitate on it. As the activity and selectivity due to coke formation gradually decrease, the initial objectives are not achieved; therefore, it is necessary to increase the operating temperature to compensate for the decline in selectivity and activity.