Catalyst for producing benzene by acetylene cyclotrimerization and its preparation method and application
A catalyst, ring trimerization technology, applied in catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of harsh reaction conditions, easy catalyst deactivation, and complex reaction feed components.
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[0054] According to the method for preparing acetylene ring trimerization catalyst for benzene production in the embodiment of the present invention, vanadium salt and chromium salt can be mixed with hot water to fully dissolve vanadium salt and chromium salt, which is beneficial to the subsequent loading of vanadium salt and chromium salt on carrier ZSM -5 to obtain a catalyst for preparing benzene by acetylene ring trimerization containing vanadium oxide and chromium oxide. In addition, by selecting ZSM-5 with suitable pore size and high strength as the carrier, on the one hand, because the pore size of the ZSM-5 carrier is extremely consistent with the pore size of the benzene molecule, the selectivity of benzene can be significantly improved; on the other hand, because of ZSM-5 The larger pore size is conducive to the diffusion of benzene molecules, thereby reducing the production of heavy aromatics such as multi-substituted benzene.
[0055] In the third aspect of the presen...
Embodiment 1
[0061] Supported catalyst V 2 O 5 / K 2 CrO 4 / Preparation of ZSM-5: Weigh 10g carrier ZSM-5, add it to 10mL of ammonium metavanadate hot water solution, the loading of ammonium metavanadate is 0.1% of ZSM-5 in terms of vanadium, and immerse at room temperature for 24 Hours, and then dried for 8 hours at 100-105 degrees Celsius in an air atmosphere, pulverized to prepare a ZSM-5 supported vanadium catalyst, denoted as V 2 O 5 (0.1) / ZSM-5; then add this catalyst to 10mL of potassium chromate hot water solution, the potassium chromate load is recorded as 0.05% of ZSM-5 in terms of chromium, soak for 24 hours at room temperature, and then in air atmosphere Dry for 8 hours at 100~105 degrees Celsius, pulverize and calcinate at 200 degrees Celsius for 5 hours to prepare acetylene ring trimerization catalyst for benzene, denoted as V 2 O 5 (0.1) / K 2 CrO 4 (0.05) / ZSM-5, after being compressed, crushed and sieved into 20-40 meshes for use.
[0062] The reaction of acetylene to benzene is c...
Embodiment 2
[0064] Supported catalyst V 2 O 5 / K 2 CrO 4 / Preparation of ZSM-5: Weigh 10g of carrier ZSM-5, add it to 10mL of ammonium metavanadate hot water solution, the loading of ammonium metavanadate is 0.5% of ZSM-5 in terms of vanadium, and immerse it at room temperature for 24 Hours, and then dried for 8 hours at 100-105 degrees Celsius in an air atmosphere, pulverized to prepare a ZSM-5 supported vanadium catalyst, denoted as V 2 O 5 (0.5) / ZSM-5; then this catalyst was added to 10mL of potassium chromate hot water solution, the potassium chromate loading was recorded as 0.05% of ZSM-5 in terms of chromium, immersed for 24 hours at room temperature, and then placed in an air atmosphere Dry for 8 hours at 100-105 degrees Celsius, pulverize and calcinate at 200 degrees Celsius for 5 hours to prepare acetylene ring trimerization catalyst for benzene, denoted as V 2 O 5 (0.5) / K 2 CrO 4 (0.05) / ZSM-5, after being compressed, crushed and sieved into 20-40 meshes for use.
[0065] The reacti...
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