Novel zeolite, and catalyst for use in production of aromatic hydrocarbon which comprises same
A technology for aromatic hydrocarbons and catalysts, applied in the field of new zeolites and catalysts for the production of aromatic hydrocarbons containing them, can solve the problems of product selectivity reduction, product yield reduction, catalyst deactivation, etc., and achieve excellent production efficiency.
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Embodiment 1
[0087] Amorphous aluminosilicate gel is added to an aqueous solution of tetrapropylammonium hydroxide (hereinafter sometimes abbreviated as TPA) and sodium hydroxide, and suspended. MFI-type zeolite was added as a seed crystal to the obtained suspension to prepare a raw material composition. The amount of seed crystals added at this time is relative to the Al in the raw material composition 2 o 3 and SiO 2 The weight of is set to 0.7% by weight. In addition, by-produced ethanol is removed by evaporation.
[0088] The composition of this raw material composition is as follows.
[0089] SiO 2 / Al 2 o 3 Molar ratio = 48, TPA / Si molar ratio = 0.05, Na / Si molar ratio = 0.16, OH / Si molar ratio = 0.21, H 2 O / Si molar ratio = 10
[0090] The resulting raw material composition was sealed in a stainless steel autoclave, and crystallized while stirring at 115° C. for 4 days to obtain a slurry-like liquid mixture. After the crystallized slurry mixed liquid was separated into sol...
Embodiment 2
[0102]The same procedure as in Example 1 was carried out up to the crystallization, washing, and drying operations of the zeolite in an autoclave. Disperse the obtained dry powder in 1 mol / L hydrochloric acid at room temperature, after filtering, wash the solid particles with a sufficient amount of pure water, filter again, and dry at 100°C overnight. After firing at 550°C for 1 hour in air, it was treated with 45% steam at 600°C for 3 hours.
[0103] The obtained powder was dispersed in 1 mol / L hydrochloric acid at 40°C, filtered, and the solid particles were washed with a sufficient amount of pure water, filtered again, and dried overnight at 100°C to obtain zeolite.
[0104] Table 1 shows the measurement results of the obtained zeolite. The obtained zeolite was a 10-membered ring fine-pore zeolite having a framework structure of an MFI-type zeolite, and the average particle diameter measured using TEM was 19 nm.
[0105] The difference spectrum of infrared absorption befo...
Embodiment 3
[0109] The same procedure as in Example 1 was carried out up to the crystallization, washing, and drying operations of the zeolite in an autoclave.
[0110] After firing the obtained dry powder at 550°C under air, disperse the obtained powder in 1 mol / L normal temperature hydrochloric acid, after filtering, wash the solid particles with a sufficient amount of pure water, filter again, and dry at 100°C for one Night.
[0111] The obtained powder was calcined at 550° C. for 1 hour in air, and then treated with 600° C. and 20% steam for 60 minutes.
[0112] Table 1 shows the evaluation results of the obtained zeolite. The obtained zeolite was a 10-membered ring fine-pore zeolite having a skeleton structure of an MFI-type zeolite, and the average particle diameter measured using TEM was 24 nm.
[0113] The difference spectrum of infrared absorption before and after 2,4-dimethylquinoline is adsorbed on the obtained MFI type zeolite is shown in figure 1 (sample amount is 56mg), ...
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