Alkaline molecular sieve catalyst for preparing styrene
A styrene and catalyst technology, applied in the field of basic molecular sieve catalysts, can solve the problems of catalysts with weak alkalinity, easily damaged structure, and poor stability, and achieve the effect of improving alkalinity and stability
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Embodiment 1
[0022] Take 50 grams of 20-40 mesh silicon-aluminum molar ratio SiO that has been pressed into tablets 2 / Al 2 o 3 The Y-type zeolite molecular sieve of 3.5 is exchanged with 0.1 mol / liter of cesium acetate as the exchange liquid. Exchange at 90°C for 3 times with a solid-to-liquid ratio of 15, and each exchange time is 2 hours. Afterwards, wash and dry at 120°C for 4 hours. The molecular sieve was calcined at 650°C for 4 hours, and then cooled in a desiccator to obtain a CsY molecular sieve.
[0023] The obtained CsY molecular sieve is put into a tube furnace, and the ammonia gas which has been dehydrated and deoxidized is passed through to carry out high-temperature nitriding. The ammonia gas flow rate was 130 ml / min, the temperature of ammonia gas treatment was 400° C., and the time of ammonia gas treatment was 4 hours.
[0024] The obtained above-mentioned catalyst was loaded into the reactor, and the charging amount was 5.0 grams. At normal pressure, the raw materia...
Embodiment 2
[0026] The CsY-type molecular sieve prepared according to Example 1 was placed in a tube furnace, and ammonia gas that had been dehydrated and deoxidized was passed through to carry out high-temperature nitriding. The ammonia gas flow rate is 120 ml / min, the temperature for nitriding, that is, ammonia gas treatment, is 500° C., and the nitriding time is 8 hours.
[0027] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.
Embodiment 3
[0029] The CsY-type molecular sieve prepared according to Example 1 was placed in a tube furnace, and ammonia gas that had been dehydrated and deoxidized was passed through to carry out high-temperature nitriding. The ammonia flow rate is 80 ml / min, the nitriding temperature is 750° C., and the nitriding time is 6 hours.
[0030] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.
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