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Na salt modified cu/sio 2 Catalyst preparation method and its application

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 improved propylene epoxidation active effect

Active Publication Date: 2022-04-15
NINGXIA UNIVERSITY
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  • Summary
  • 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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  • Na salt modified cu/sio <sub>2</sub> Catalyst preparation method and its application
  • Na salt modified cu/sio <sub>2</sub> Catalyst preparation method and its application
  • Na salt modified cu/sio <sub>2</sub> Catalyst preparation method and its application

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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 Na salt modified Cu / SiO 2 The preparation method and application of the catalyst, the catalyst obtained by the preparation method can significantly improve the selectivity of propylene oxide in the propylene epoxidation reaction, and the catalyst cost is low. The preparation method includes the following steps, 1) carrying out acidification treatment to the carrier: SiO 2 Place in an aqueous mineral acid solution, condense and reflux for 6-48h, then filter and wash until neutral, and dry; 2) Cu / SiO 2 Sample preparation: Dissolve Cu precursor compound in water, add acidified SiO 2 The solid is stirred and mixed, and then an aqueous solution of a precipitating agent is added dropwise; the mixed system is subjected to a precipitation reaction at 70-130°C; the obtained solid sample is washed to neutrality, and the Cu / SiO 2 Sample; 3) Cu / SiO 2 The sample was placed in an aqueous solution of Na salt accelerator, stirred at 20-60°C for 0.5-5h, then evaporated to dryness, and then dried.

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 Patents(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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