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Molecular sieve catalyst and preparation method thereof

A molecular sieve and catalyst technology, applied in the field of molecular sieve catalyst and its preparation, can solve the problems of insufficiency, high cost, complicated operation, etc., and achieve the effects of strong stability and simple and easy preparation method.

Inactive Publication Date: 2004-11-10
SYNFUELS CHINA TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

We have used modified molecular sieve ZrZSM-5 as a catalyst for olefin oligomerization, because the presence of Zr adjusted the reaction characteristics of the ZSM-5 molecular sieve catalyst, so the catalyst has high selectivity, and the diesel fraction C in the product 12 -C 18 The fraction can reach 78%, (see patent: 01119414.6H type ZSM-5 molecular sieve catalyst in the synthesis of low carbon olefins C 12 -C 18 However, in the long-term continuous operation of the catalyst, its one-way life is less than 350 hours, which will cause frequent regeneration of the catalyst, which is not only costly, but also cumbersome to operate, so it is far from meeting the needs of actual industrial production

Method used

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  • Molecular sieve catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Molar ratio of silicon source, sodium salt and deionized water into SiO 2 :Na 2 O:H 2 O=0.02: 0.006: 1 is formulated into A solution; Aluminum source, acid and deionized water are prepared into B solution in molar ratio as aluminum source: acid: deionized water=0.001: 0.04: 1; Zirconium source, deionized water The molar ratio of water is zirconium source: deionized water = 0.001:1 to prepare C solution.

[0027] The ingredients are operated in the following order: under vigorous stirring, add 200ml of B solution to 500ml of A solution dropwise, and stir evenly. Then add 22.4g hexamethylenediamine, then add 200ml solution C, stir for 30 minutes, make it mix well. Finally, transfer the prepared gel mixture into a synthesis kettle and seal it.

[0028] Under uniform stirring, the temperature was raised to 120°C at a heating rate of 1°C / min, and kept at a constant temperature for 40 hours. Then continue to heat up to 170°C at a heating rate of 1°C / min, and keep the...

Embodiment 2

[0039] (1) First nSiO 2 / nAl 2 o 3 ZrHZSM-5 molecular sieve with a ratio of 68.6, Zr(wt)%: 1.21 was roasted at 540°C for 3 hours to remove the impurities adsorbed by it; for the specific preparation process of ZrHZSM-5, refer to a rapid synthesis of ZSM containing zirconium atoms in patent 03124261.8 -5 The synthetic method of molecular sieve, following examples are identical;

[0040] (2) 13 grams of molecular sieves treated in step (1) are mixed with 6 grams of γ-Al 2 o 3 . At the same time, put it into the mortar and mix it, and grind it evenly;

[0041] (3) Add 3% nitric acid solution dropwise to the ground material and knead properly, extrude it into a columnar shape of Φ2 with a manual screw extruder, put it in an oven and dry it at 105°C;

[0042] (4) Then crush the strip molecular sieve to 10-40 mesh and put it in a muffle furnace and heat it up to 510 ° C for 3 hours to remove nitric acid and moisture, and take it out when the temperature drops below 60 ° C;

...

Embodiment 3

[0048] (1) First nSiO 2 / nAl 2 o 3 Ratio is 131, Zr (wt)%: ZrHZSM-5 molecular sieve of 2.15 is roasted at 540 ℃ for 3 hours to remove the impurity it adsorbs;

[0049] (2) 14.4 grams of molecular sieves treated in step (1) are mixed with 5.6 grams of pseudo-thin water alumina in a mortar and mixed, evenly ground;

[0050] (3) Add 2% nitric acid solution dropwise to the ground material and knead appropriately, extrude it into a columnar shape of Φ2 with a manual screw extruder, put it in an oven and dry it at 115°C;

[0051] (4) Then crush strip molecular sieves to 10-40 mesh, put them in a muffle furnace and heat up to 520 ° C for 3 hours to remove nitric acid and moisture, and take them out when the temperature drops below 60 ° C;

[0052] (5) Accurately weigh 4.0 grams of 98% sulfuric acid and put it into a volumetric flask, add deionized water to 200ml to be mixed with 0.2mol solution J; then weigh 6.04 grams of lanthanum nitrate and add it to solution Y 3 in, under sti...

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Abstract

The invention is a molecular sieve catalyst whose components according to weight percent are La 0.5-3.0 and molecular sieve 97.0-99.5. It adopts La to modify the hetero-atom molecular sieve ZrHZSM-5. It has advantages of simple preparation and easy operation, strong catalyst stability, above 450-hour single-pass service life.

Description

Technical field: [0001] The invention belongs to a molecular sieve catalyst and a preparation method thereof, in particular to a high-stability molecular sieve catalyst and a preparation method thereof for producing diesel oil fractions by lamination of olefins. Background technique: [0002] An important chemical reaction in which olefin monomers are stacked to form compounds containing one or more structural units that are repeatedly connected. It is an effective way to synthesize liquid fuels, plastics, drugs, dyes, resins, detergents, lubricating oils, and additives . Edited by Gao Zi, Sinopec Press's "Zeolite Catalysis and Separation" (1999) pointed out that low-carbon olefin oligomerization (such as propylene, butene) can be used to synthesize environmentally friendly liquid fuels, and the content of aromatics in the product is very low. Catalysts used in the conversion process in industry can be mainly divided into two types of acidic catalysts: molecular sieve and n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40
Inventor 胡津仙李晓波王峰李英任杰李永旺
Owner SYNFUELS CHINA TECH CO LTD
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