A kind of ethylbenzene dehydrogenation catalyst and preparation method thereof
A technology of ethylbenzene dehydrogenation and catalyst, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high catalyst cost, difficult heat recovery, chromium catalyst poisoning, etc. Effects of hydrogen efficiency, reduction of carbon deposition, and improvement of catalytic performance
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Embodiment 1
[0027] Dissolve 14ml of tetrapropylammonium hydroxide (1mol / L) and 0.26g of aluminum isopropoxide in 65ml of distilled water, then add 20.8g of ethyl orthosilicate, and crystallize at 110°C for 4 hours to obtain a clear solution A; Dissolve 4.5g of cetyltrimethylammonium bromide in 80ml of sodium hydroxide solution (0.5mol / L), stir until completely dissolved, then mix with clear solution A, crystallize at 140°C for 9 hours, wash , filtered, dried, and calcined at 600°C for 4 hours to obtain ZSM-5 / MCM-48 microporous / mesoporous composite molecular sieve; using equal volume co-impregnation method, the required amount of ammonium metavanadate solution and cerium acetate solution were impregnated On 1g ZSM-5 / MCM-48 microporous / mesoporous composite molecular sieve, after standing at room temperature for 15 hours, dry at 110°C for 4 hours, and then bake at 550°C for 5 hours to obtain a weight percent composition of 4.5% CeO 2 -11%V 2 o 5 - 84.5% catalyst of ZSM-5 / MCM-48. The catal...
Embodiment 2～6
[0033] CeO 2 -V 2 o 5 -The preparation of ZSM-5 / MCM-48 catalyst and activity evaluation method are the same as embodiment 1, difference is to change CeO 2 , V2 o 5 And ZSM-5 / MCM-48 component content. Its weight percent composition and catalytic activity are shown in Table 1 and Table 2, respectively.
[0034] The weight percent composition of table 1 catalyst
[0035]
[0036]
[0037] Table 2 Catalysts in CO 2 Catalytic Activity in Dehydrogenation of Ethylbenzene under Atmosphere
[0038]
Conversion rate of ethylbenzene (%)
Styrene selectivity (%)
Styrene yield (%)
Example 1
75.2
98.7
74.2
Comparative example 1
66.4
82.5
54.8
Comparative example 2
61.9
95.2
58.9
Example 2
73.1
98.3
71.9
Example 3
65.8
98.9
65.1
Example 4
71.2
98.4
70.1
Example 5
75.0
98.8
74.1
Example 6
73.9
98.5
72.8
...
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