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Preparation method of Cu/SiO2 catalyst modified by Na salt and application of preparation method

A technology of catalysts and compounds, applied in the field of Cu/SiO2 catalysts, can solve the problems of few modifiers and unclear essential reasons for the selectivity of propylene oxide, and achieve energy-saving and high-efficiency processes, low catalyst costs, and increased production rates.

Active Publication Date: 2020-02-04
NINGXIA UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, a large number of literatures mainly use NaCl as the modifier and prepare the catalyst by calcination; there are few references to the application of other modifiers in the epoxidation of propylene, and the essential reason why the modifier improves the selectivity of propylene oxide is still unclear

Method used

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  • Preparation method of Cu/SiO2 catalyst modified by Na salt and application of preparation method
  • Preparation method of Cu/SiO2 catalyst modified by Na salt and application of preparation method
  • Preparation method of Cu/SiO2 catalyst modified by Na salt and application of preparation method

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preparation example Construction

[0040] 2) Cu / SiO 2 sample preparation

[0041] Preparation of Cu / SiO by Homogeneous Precipitation Method 2 Samples (where Cu oxides (CuO and Cu 2 O) the mass fraction is 5%):

[0042] Weigh 0.95g of Cu precursor compound Cu(NO 3 ) 2 ·3H 2 O was dissolved in 100ml double distilled water, then added 4.75g of the acidified SiO obtained in step 1). 2 Solid (i.e. carrier), then slowly add dropwise the aqueous solution 10ml that contains 2.34g precipitation agent urea, Cu(NO 3 ) 2 ·3H 2 The molar ratio of O to urea is 1:10. Stir the mixed sample for 0.5h; then put the mixed system into an oil bath at 100°C, heat it with stirring and keep it for about 24h; wash the obtained solid sample with twice distilled water until neutral, and dry it in a vacuum oven at 100°C for 10h , to obtain light green solid Cu / SiO 2 sample;

[0043] 3) Na salt modified Cu / SiO 2 catalyst

[0044] Na salt accelerator modified Cu / SiO 2 The catalyst is prepared by wet impregnation method:

Embodiment 1-7

[0047] Prepare Cu / SiO modified with different Na salts following the above procedure 2 catalyst. Embodiment 1 does not add Na salt accelerator in step 3); Embodiment 2-7 uses NaNO respectively in step 3) successively 2 、Na 2 SO 4 , NaCl, Na 2 C 2 o 4 、Na 2 CO 3 , NaOH as Na salt promoter. In embodiment 1-7, when carrying out step 3), its Cu / SiO 2 The amount of sample, the amount of Na salt accelerator and the amount of water are shown in Table 1 below, and the obtained Na salt modified Cu / SiO 2 In the catalyst, the molar ratios of Na and Cu are shown in Table 1, respectively.

[0048] Table 1: Partial synthesis conditions of step 3)

[0049]

Embodiment 8-12

[0055] Follow the steps above to prepare different Na 2 CO 3 Modified Cu / SiO 2 catalyst. In embodiment 8-12, when carrying out step 3), its Cu / SiO 2 Sample dosage, Na salt promoter (Na 2 CO 3 ) consumption and the consumption of water are all referred to as shown in table 2 below, gained Na 2 CO 3 Modified Cu / SiO 2 In the catalyst, the molar ratios of Na and Cu are shown in Table 2, respectively.

[0056] Table 2: Partial synthesis conditions of step 3)

[0057]

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Abstract

The invention provides a preparation method of a Cu / SiO2 catalyst modified by Na salt and application of the preparation method. The catalyst obtained by the preparation method can significantly improve the selectivity of cyclopropane in propylene epoxidation reaction, and the catalyst cost is low. The preparation method comprises the following steps that (1) a carrier is acidified, specifically,SiO2 is placed into an inorganic acid aqueous solution, condensing and refluxing are conducted for 6-48 h, then filtering and washing are conducted to be neutral, and drying is conducted; (2) a Cu / SiO2 sample is prepared, specifically, a precursor compound of Cu is dissolved in water, the acidified SiO2 solid is added, stirred and mixed, then a precipitant aqueous solution is added dropwise into the mixture, a mixed system is subjected to precipitation reaction at 70-130 DEG C, the obtain solid sample is washed to be neutral, and the Cu / SiO2 sample is obtained after drying; and (3) the Cu / SiO2sample is placed into an aqueous solution of a Na salt accelerant, stirring is conducted for 0.5-5 h at 20-60 DEG C, then evaporating is conducted to be dry, and then drying is conducted.

Description

technical field [0001] The invention relates to the technical field of catalysts for the preparation of propylene oxide by epoxidation of propylene, in particular to Cu / SiO for Na salt modification 2 catalyst. Background technique [0002] Propylene oxide, referred to as PO, is a very important basic organic chemical raw material in the synthesis of downstream products and the production of fine chemicals. It is the third largest propylene derivative after polypropylene and acrylonitrile. At present, there are mainly two methods for producing propylene oxide from propylene in industry: chlorohydrin method and Halcon co-oxidation method. Among them, the chlorohydrin method is the main method for producing PO, and it is also the earliest method for producing PO introduced and used in my country. It has the advantages of mature production technology, short process flow, and low requirements on the purity of raw materials, but it will produce CaCl 2 And a large amount of chlor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232B01J27/055B01J27/10B01J23/78B01J37/08C07D301/08C07D303/04
CPCB01J27/232B01J27/055B01J27/10B01J23/78B01J37/08C07D301/08C07D303/04Y02P20/52
Inventor 苏暐光史雨晨高晶晶宋旭东白永辉王焦飞于广锁
Owner NINGXIA UNIVERSITY
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