Multistage hole ZSM-5/SiO2 catalyst, preparation method catalyst, and n-octane catalytic cracking method
A ZSM-5, catalytic cracking technology, applied in the petrochemical field, can solve the problem of high temperature in the cracking reaction of the tube furnace, and achieve the effect of excellent reaction performance and improved mechanical strength
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[0045] Example 1
[0046] This embodiment provides a multi-level hole ZSM-5 / SiO based on small crystal grain ZSM-5 2 The composite catalyst is prepared by the following steps:
[0047] At room temperature, weigh 27.38g of TPAOH and 19.82g of water, mix and stir, then add 0.38g of aluminum isopropoxide every half an hour, and then add 20.03g of TEOS after half an hour, and then stir the four substances together for 12 hours to obtain a mixed solution;
[0048] The mixed solution is subjected to 6 hours of open alcohol distillation treatment at 50°C, and the water lost due to evaporation is supplemented during the alcohol distillation process;
[0049] Then press macroporous-mesoporous SiO 2 Carrier: Silica sol=0.065:1 mass ratio Put the carrier into the mixed solution for 30 minutes, then pour the mixed solution and the substrate into the cleaned PTFE hydrothermal synthesis kettle, and crystallize at 90℃ 72h;
[0050] After the crystallization is completed, the synthesized solution is f...
Example Embodiment
[0054] Example 2
[0055] The crystallization time of the sample in Example 1 was changed to 96h, and other conditions were the same as those in Example 1. The obtained reaction results and main product yields are shown in Table 2.
[0056] The multi-porous ZSM-5 / SiO prepared in this example 2 The XRD pattern and SEM pattern of the composite catalyst are as follows: Figure 2a with Figure 2b Shown.
[0057] Table 2 Yield distribution of main products of cracking reaction
[0058]
Example Embodiment
[0059] Example 3
[0060] The crystallization time of the sample in Example 1 was changed to 120h, and other conditions were the same as in Example 1. The obtained reaction results and main product yields are shown in Table 3.
[0061] The multi-porous ZSM-5 / SiO prepared in this example 2 The XRD pattern and SEM pattern of the composite catalyst are as follows: Figure 3a with Figure 3b Shown.
[0062] Table 3 Yield distribution of main products of cracking reaction
[0063]
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