does catalyst really not participate in chemical reactions? so why can the reaction rate be changed? iupac defines a catalyst as follows: a catalyst is a substance that changes the reaction rate but does not change the total standard gibbs free energy of the reaction. this effect is called catalysis, and reactions involving catalysts are called catalytic reactions.
the catalyst itself may not necessarily be added, and the quality may not remain the same (some become more, some less).
for example, permanganic acid oxidizes oxalic acid, and the product divalent manganese is the catalyst (and more and more, trivalent manganese and tetravalent manganese are also used)
(of course, this reaction will be very slow when divalent manganese is not added at the beginning. after all, it is not easy to carry out oxidation and reduction between the two anions. of course, stir quickly with your hands for half an hour. it still responds after an hour)
of course, the mass of the catalyst decreases after the reaction
sodium consumption is very small, so it is still used as a catalyst.
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zf-10: high-efficiency and low-odor foaming catalyst, typically used in the preparation of low-odor polyurethane foam products
zr-50: low-odor gel catalyst, providing excellent balance and can be used for polyurethane molded high-resilience foam
z-131: reactive low-odor gel amine catalyst compound
z-130: low odor gel catalyst, balanced gel/foaming
zr-70: low odor catalyst for packaging foam and molded foam on vinyl skins good balance of foaming and gelling
zr-40 (pentamethyldipropylenediamine): particularly effective for cold molded high-resilience foam, with a good balance between low-odor gel and foaming catalyst
le-310: low-odor reactive gel catalyst applied to large sponges, new low-voc amine gel catalyst, amine content exceeds 95%
le-530: reactive gel catalyst, used in various polyurethane foam products
dpa: low-odor gel catalyst, outstanding balance and versatility provide good fluidity
tap 1-methyl-4-(2-dimethylaminoethyl)piperazine: excellent trimerization catalyst that improves fluidity
dmdee (2,2′-dimorpholine diethyl ether): strong foaming catalyst, providing stable prepolymer system span>
dmaee: low-density full-water rigid foam and low-density semi-rigid foam
bdmaee bis-(2-dimethylaminoethyl) ether: efficient foaming catalyst
bdma (n,n-dimethylbenzylamine): polyurethane rigid foam catalyst, epoxy accelerator
dmea (n,n’-dimethylethanolamine): neutralizes acid in some rigid foam systems,
pmdeta (pentamethyldiethylenetriamine): particularly effective for hcfc/water-foamed hard foam, similar to pc5
