What does “capping” refer to in the context of catalysts?
Thread Content
Once the drums have been opened, the catalyst should be visually inspected. There should be little sign of capping (a clean shear fracture of one end of the pellet) or other irregularities. :L:L
Capping – here it refers to the presence of a cap-like structure or irregularities, which are abnormal phenomena that may occur during the processing and shaping of catalysts.
Is there a trace of micro-fracture at one end of the catalyst particle, caused by capping (capping is a biochemical term; it refers to the acetylation of the 5’ hydroxyl group using dehydrated acetic anhydride under the catalysis of N-methylimidazole (NMI), with the extracyclic groups of the base still bearing protective groups)? It’s too deep; Baidu’s
(a clean shear fracture of one end of the pellet): Is there an obvious shear fracture at one end of the (catalyst) particle? How can this explain capping?
Shear – If a part of something, especially something made of metal, undergoes shear, it breaks into two pieces, usually as a result of a lateral force. Fracture – If a hard object, such as a bone, fractures, it cracks or breaks. Pellet – A small, hard ball or tube-shaped piece of any substance; in this case, it refers to the ball of catalyst.
What’s in the parentheses is the explanation of the capping, and its meaning in Chinese is “top cracking that occurs at one end of the catalyst”.
That just means placing “caps” on the tube that you are working on. The caps on the catalyst tubes? It’s the reply from a colleague at Texas Catalyst, but he isn’t sure either; he will ask other colleagues.
Capping, something that caps, means a lid or cap； clean, tidy ； shear, cut, trim ； fracture, breakage ； pellet: ball, particle, projectile. Now that you’ve seen this, do you understand? A spherical catalyst pellet cut in half at one end – isn’t what’s left the “cap”?