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Ngoba kukhona ama-pores amancane angaphakathi afanayo esakhiweni sochungechunge lwe-REY zeolite, lapho ubukhulu bamangqamuzana bama-reactants nemikhiqizo besondele kububanzi be-pore ku-crystal, ukukhethwa kokuphendula kwe-catalytic kuvame ukuncika ngosayizi ohambisanayo we-molecule nobubanzi be-pore.