[Q&A Question 263] 2017.09.21
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【Q&A Question 263】September 21, 2017: Briefly describe the role of additives in hydrogenation catalysts (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The answers to the daily questions change, and today’s answers are shown in subsequent questions. For management purposes, if you need to view content from a few days ago, please access it through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum)
Protect the main catalyst and filter out impurities in the raw materials.
It also has strong compressive resistance, preventing the catalyst from breaking.
Additives can help catalysts enhance their catalytic activity and selectivity, thereby facilitating the catalysis of the main reaction
Additives have many functions: 1. Provide coordinating electrons; 2. Disperse the active components to prevent sintering; 3. Some additives are catalysts in their own right and can act in synergy with the active components; 4. Adjust acidity, alkalinity, strength, and particle size
Different metal elements have distinct functions; for example, the addition of Si and B facilitates metal dispersion, enabling it to be better converted into the Ni-Mo-S active phase
To improve certain aspects of the catalyst’s performance, such as activity, selectivity, stability, etc
To improve certain aspects of the catalyst’s performance, such as activity, selectivity, stability, etc
Based on their mechanisms of action, additives can be divided into structural additives and modification additives. The function of structural additives is to increase the surface area, prevent sintering, and improve the structural stability of the catalyst ； The function of modifiers is to alter the electronic structure, surface properties, or crystal structure of the catalyst. The additive itself does not have high activity, but when combined with the main active component it can exert a positive effect, altering the catalyst’s activity and enhancing selectivity. There should be a reasonable ratio between the main metal and the additives
Improve the stability and activity of the catalyst
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