A kind of preparation method of high stability Y-type molecular sieve
A molecular sieve and weight technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor hydrothermal stability, complex preparation process, and low cracking activity of zirconium-modified Y-type molecular sieves. Effects of high hydrothermal stability, high thermal and hydrothermal stability, high cracking activity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0023](1) At room temperature, get 200g NaY molecular sieves (dry basis 75% by weight), mix with 1500ml of hydrochloric acid solution with a molar concentration of 0.5mol / L, stir for 30 minutes, filter, and wash with 1500ml deionized water to obtain NaY after acid treatment Molecular sieve, repeat above-mentioned steps 2 times, its sodium oxide content is 2.2% by weight;
[0024] (2) Calcining the obtained acid-treated Y molecular sieve at 500° C. for 3 hours to obtain a Y molecular sieve with a solid content of 96% by weight, denoted as F1;
[0025] (3) Put the above-mentioned F1 molecular sieve into the reactor, heat up to 300°C at a rate of 5°C / min, use nitrogen to bring zirconium isopropoxide gas into the reaction, and contact isopropanol and nitrogen at 300°C for 2 hours The ratio is 1:10 (molar ratio), with zirconia (ZrO 2 ) ratio of zirconium isopropoxide to F1 molecular sieve on a dry basis is 4.0:100. The zirconium-modified Y-type molecular sieve provided by the pre...
Embodiment 2～5
[0027] Molecular sieves were prepared according to the method provided by the present invention. The properties of the molecular sieve raw materials used in step (1) are shown in Table 1, and the operating conditions and properties of the products are shown in Table 2. Refer to Example 1 for the remaining unspecified operating conditions.
[0028] Table 1
[0029] raw material
NaY
DASY(0.0)
hand in a bake
Na 2 o
12.8
1.2
3.7
Al 2 o 3
21.9
23.6
23.4
SiO 2
64.4
71.7
72.0
Cell constant, nm
2.466
2.448
2.453
81.6
65.6
78.0
Total specific surface area, m 2 / g
762
620
644
Total pore volume, ml / g
0.377
0.353
0.352
[0030] Table 2
[0031]
[0032]
[0033] As can be seen from the data in Table 2, compared with the comparative examples, the modified Y molecular sieves pr...
Embodiment 6～10
[0035] Examples 6-10 illustrate the hydrothermal stability of the modified Y molecular sieve prepared by the present invention.
[0036] After aging the modified Y molecular sieves prepared in Examples 1 to 5 for 17 hours at 800°C and 100% water vapor, measure their crystallinity and specific surface area, calculate the crystallization retention and specific surface area retention, and carry out light oil Micro-reaction evaluation, adopt the standard method of RIPP92-90 (see "Petrochemical Analysis Method" (RIPP test method) edited by Yang Cuiding, etc., Science Press, published in 1990) to evaluate the light oil micro-reactivity of sample, and the catalyst loading is 5.0g, the reaction temperature is 460°C, the raw material oil is straight-run light diesel oil with a distillation range of 235-337°C, the product composition is analyzed by gas chromatography, and the light oil microreactivity is calculated according to the product composition. The results are listed in Table 3....
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More