A kind of molecular sieve catalyst for the catalytic cracking of MTP by-product hydrocarbons and its preparation method
A technology of molecular sieves and catalysts, which is applied in the field of molecular sieve catalysts and their preparation, can solve problems such as separation difficulties, thermal stability and hydrothermal stability reduction of nano-molecular sieves, and achieve rich structural features, good catalytic cracking effect, and reduction of side effects such as aromatics. The effect of product formation
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Embodiment 1-16
[0080] II. The hydrocarbon cracking catalytic performance evaluation of the modified ZSM-5 molecular sieve catalyst obtained in embodiment 1-16
[0081] The properties of the modified ZSM-5 molecular sieve catalysts obtained in Examples 1-16 were investigated by catalytic cracking of the model compound n-hexane. The catalytic cracking reaction was evaluated in a continuous small fixed-bed reactor. The reaction tube is a φ10mm×430mm quartz tube, the catalyst loading is 0.5-2.0g, the reaction temperature is 550-650°C, and the space velocity is 1-3.0h -1 , the system pressure is normal pressure. The SP-3420 gas chromatograph was used for on-line analysis, and the organic composition in the product was detected by a hydrogen flame ionization detector, and a small amount of dry gas generated during the reaction was ignored. Before the reaction starts, the catalyst is firstly activated under the condition that N 2 The molecular sieve bed was purged for 1 h at a flow rate of 50 L / ...
Embodiment 17
[0084] At normal pressure, the temperature is 625°C, the catalyst loading is 2.0g, and the space velocity is 3h -1 Under the condition, examine different TPXA among the embodiment 1-4 + The catalytic cracking performance of ZSM-5 molecular sieve synthesized by the added amount on n-hexane, and the evaluation results are shown in Table 5.
Embodiment 18
[0086] At normal pressure, the temperature is 625°C, the catalyst loading is 2.0g, and the space velocity is 3h -1 Under certain conditions, the catalytic cracking performance of ZSM-5 molecular sieves with different silicon-aluminum ratios in Examples 5-8 on MTP by-product hydrocarbons was investigated, and the evaluation results are shown in Table 6.
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