Main > PETROLEUM > Catalysis. > Org.: Spain. I.Ui (Zeolite>ITQ-21) > Structure
Three-dimensional channel system contg. 1.18-nm-wide cavities. The cavities are accessible through 6 circular windows that are composed of 12-membered rings. By comparison, faujasite-type zeolites, such as USY-1 which is widely used in petroleum cracking, have just 4 such windows, limiting diffusion through the catalyst
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