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Preparation method for mesoporous-microporous composite hydroisomerization dewaxing catalyst

A catalyst and microporous technology, which is applied in the field of preparation of mesoporous-microporous composite molecular sieve and its hydroisomerization catalyst, can solve the problems of few application reports and the like, and achieve the effect of high dispersion of precious metals

Inactive Publication Date: 2017-03-22
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on the application in lubricating oil hydroisomerization reaction

Method used

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  • Preparation method for mesoporous-microporous composite hydroisomerization dewaxing catalyst
  • Preparation method for mesoporous-microporous composite hydroisomerization dewaxing catalyst
  • Preparation method for mesoporous-microporous composite hydroisomerization dewaxing catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The synthesis of ZSM-23 is according to the disclosed method of U.S. Patent US4076842: 1. 13.76g aluminum sulfate, 64g deionized water and 6.8gNaOH are mixed, stirred evenly, then add 36.4g pyrrolidine and continue to stir; 2. 321.9g silica sol (30% SiO 2 ,70%H 2 0) Add the above solution and stir until a gel is formed; ③ put the above gel in a high-pressure reactor to heat and stir, and continuously crystallize at 180°C for 72h; ④ Wash and filter the product until the filtrate is neutral, and The filter cake was dried at 110°C for 8h to obtain SiO 2 / Al 2 o 3 ZSM-23 molecular sieve raw powder with a molar ratio of about 40. The amount of aluminum sulfate is Al 2 o 3 In terms of, the amount of NaOH is Na 2 In terms of O, the amount of silica sol is SiO 2 Calculated, the feeding molar ratio is as follows: SiO 2 / Al 2 o 3 =40,Na 2 O / SiO 2 =0.05, Pyd / SiO 2 =0.32,H 2 O / SiO 2 =10.

[0058] Some samples were taken for X-ray diffraction analysis. figure 1 The...

Embodiment 2

[0060] Weigh 16g cetyltrimethylammonium bromide (CTAB), add 777g deionized water, stir until dissolved, then add 33.3g silica sol (30% SiO 2 , 70%H 2 O), 1.25g aluminum sulfate, 40g ZSM-23 molecular sieve powder, mix evenly, finally add a certain amount of NaOH to adjust the pH of the solution to 10-11, and continue to stir for 2h. The reaction solution was put into a crystallization kettle, and crystallized at 120°C for 24 hours; the reaction product was cooled, washed, and dried to obtain the composite molecular sieve powder As-ZM. The mesoporous MCM-41 molecular sieve accounts for about 20 wt% of the composite molecular sieve.

[0061] Some samples were taken for X-ray diffraction analysis. figure 2 It is the wide-angle XRD pattern of composite molecular sieve ZM, and the result shows that there is ZSM-23 molecular sieve in the obtained sample, image 3 The small-angle XRD diffraction pattern of the composite molecular sieve ZM shows that MCM-41 molecular sieve exists i...

Embodiment 3

[0063] Weigh 24g P123, add 577g deionized water, stir until dissolved, then add 33.3g silica sol (30% SiO 2 ,70%H 2 O), 1.25g aluminum sulfate, 40g ZSM-23 molecular sieve powder, mix evenly, finally add a certain amount of HCl to adjust the pH of the solution to 2-4, and continue to stir for 2h. The mixed slurry was put into a crystallization kettle, and crystallized at 100°C for 24 hours; the reaction product was cooled, washed, and dried to obtain the composite molecular sieve powder As-ZS. Among them, the mesoporous SBA-15 molecular sieve accounts for about 20 wt% in the composite molecular sieve.

[0064] Some samples were taken for X-ray diffraction analysis. Figure 4 It is the wide-angle XRD pattern of composite molecular sieve ZS, and the result shows that there is ZSM-23 molecular sieve in the obtained sample, Figure 5 The small-angle XRD diffraction pattern of the composite molecular sieve ZS shows that SBA-15 molecular sieve exists in the obtained sample.

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Abstract

The invention discloses a preparation method for a mesoporous-microporous composite hydroisomerization dewaxing catalyst. The invention relates to a mesoporous-microporous composite molecular sieve. The composite molecular sieve with a core-shell structure is formed by compounding with microporous ZSM-23 as a core and a mesoporous molecular sieve MCM-41 or SBA-15 as a shell in a manner of eutecticuming, wherein internal and external proportions and acidity of the molecular sieve are adjustable. The hydroisomerization dewaxing catalyst prepared by using the composite molecular sieve with the core-shell structure as a carrier through an excessive impregnation method has moderate acidity, can adjust the relative content of the composite molecular sieve in the catalyst according to the needs for acidity, has high noble metal dispersity, and is especially applicable to hydroisomerization reactions of long-chain n-alkanes and raw materials with high wax content. The obtained lubricant base oil has low pour point and high yield, and shows high isomerization reaction activity and selectivity, wherein the isomeric selectivity is larger than 93% on the premise that the conversion rate is 97%, and especially, the isomeric selectivity of multi-branched alkanes is significantly increased and is larger than 58%. The preparation method provided by the invention has the advantages of simple operation and good reproducibility.

Description

technical field [0001] The present invention relates to a kind of preparation method of mesoporous-microporous composite molecular sieve and its hydrogenation isomerization catalyst, more specifically the present invention provides the composite molecular sieve with microporous MTT (ZSM-23) and mesoporous MCM-41 or SBA-15 Hydroisomerization catalyst with molecular sieve structure. Background technique [0002] The hydroisomerization catalyst is a dual-functional catalyst, which has both hydrogenation-dehydrogenation activity and an acidic center. Among them, the hydrogenation reaction is carried out on the metal active center, and the skeletal isomerization and cracking reactions are carried out on the acidic center of the carrier. . In the hydroisomerization reaction of long-chain n-alkanes, the acid density and acid strength of the catalyst determine the activity and isomerization selectivity of the catalyst. The acidic support in the catalyst not only provides a suitabl...

Claims

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Application Information

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IPC IPC(8): B01J29/80C10G45/64
CPCC10G45/64B01J29/74B01J29/7492B01J29/80C10G2300/1062C10G2400/10B01J35/617B01J35/63B01J35/647B01J35/615
Inventor 郑修新刘有鹏于海斌李孝国孙国方赵甲高鹏费亚南臧甲忠李佳隋芝宇
Owner CHINA NAT OFFSHORE OIL CORP
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