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Nanoscale intercalated hydrotalcite catalyst as well as preparation method and application thereof

A catalyst and nano-scale technology, applied in the direction of catalyst activation/preparation, carbon monoxide reaction preparation, chemical instruments and methods, etc., can solve the problems of low conversion rate and high raw material cost, and achieve the effect of easy operation, simple preparation method and stable performance

Active Publication Date: 2018-11-30
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the technical problems that the synthesis gas conversion catalyst in the prior art cannot catalytically convert synthesis gas into aldehyde organic compounds, and the existing catalyst used solely for the preparation of acetaldehyde has high raw material cost and low conversion rate, etc., the present invention provides A nano-scale intercalated hydrotalcite catalyst and its preparation method and application, the nano-scale intercalated hydrotalcite catalyst has high selectivity to acetaldehyde, can catalytically convert synthesis gas into acetaldehyde, and has a high conversion rate and a simple preparation method , easy to operate, can greatly reduce the cost of raw materials for the preparation of acetaldehyde, and has a good industrial application prospect

Method used

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  • Nanoscale intercalated hydrotalcite catalyst as well as preparation method and application thereof
  • Nanoscale intercalated hydrotalcite catalyst as well as preparation method and application thereof
  • Nanoscale intercalated hydrotalcite catalyst as well as preparation method and application thereof

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preparation example Construction

[0035] A kind of nanoscale intercalation hydrotalcite catalyst, its preparation method can comprise the following steps:

[0036] Step A, mix the soluble salt with catalytic activity, the soluble salt of trivalent metal and alkaline substance, make the pH value of mixed solution be 7~13 (this pH value is preferably 8~11), and with reaction temperature 60-160° C. (the reaction temperature is preferably 80-140° C.), and react for 6-48 hours to prepare a catalyst precursor with a pH value of 7-13 (the pH value is preferably 8-11). Wherein, the soluble salt with catalytic activity and the soluble salt of the trivalent metal can be in any ratio, and the amount of the alkaline substance is enough so that the pH of the mixed solution is 7-13.

[0037] Step B, adding macromolecular organic matter to the catalyst precursor for intercalation reaction (the intercalation reaction can adopt the intercalation reaction in the prior art, that is, when the main reactant is a layered structure,...

Embodiment approach

[0041](1) The soluble salt with catalytic activity is a soluble salt of at least one of Co, Fe, Ru, Rh, Ni; for example: the soluble salt with catalytic activity can be Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 2 9H 2 O, Ni(NO 3 ) 2 ·6H 2 O or RuCl 3 ·3H 2 O.

[0042] (2) the soluble salt of described trivalent metal can be the soluble salt of at least one in aluminum ion or chromium ion; For example: the soluble salt of described trivalent metal can be Al(NO 3 ) 3 9H 2 O.

[0043] (3) The alkaline substance can use NH 3 ·H 2 O, NaOH, Na 2 CO 3 , urea, and at least one of hexamethylenetetramine.

[0044] (4) The macromolecular organic matter is at least one of sodium lactate, short-chain alcohol, formamide and derivatives thereof.

[0045] (5) The reducing gas is at least one of hydrogen and carbon monoxide.

[0046] (7) The peeling can use one or a combination of vibration, ultrasound, and centrifugation.

[0047] Specifically, the preparation method of the nanoscale...

Embodiment 1

[0054] A kind of nanoscale intercalation hydrotalcite catalyst, its preparation method can comprise the following steps:

[0055] Step a1, 3.638g of Co(NO 3 ) 2 ·6H 2 O, 2.345g of Al(NO 3 ) 3 9H 2 The urea of ​​O, 2.289g all adds to 50mL and removes CO 2 in deionized water, fully stirred evenly, and then placed in a 100mL hydrothermal kettle, and reacted for 48h at a reaction temperature of 80°C, thereby preparing a catalyst precursor with a pH value of 8-11.

[0056] Step b1, adding 20 mL of sodium lactate to the catalyst precursor for intercalation reaction, the reaction temperature is 70° C., and the reaction time is 24 h, so as to prepare a catalyst precursor for intercalation organic matter.

[0057] Step c1. Add 20 mL of deionized water to the catalyst precursor of the intercalated organic matter, place it in a high-speed centrifuge, and centrifuge it at a speed of 6000 r / min for 30 min to remove solids, thereby preparing a stripping solution.

[0058] Step d1, us...

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Abstract

The invention discloses a nano-scale intercalated hydrotalcite catalyst as well as a preparation method and application thereof. The method comprises the steps that soluble salt with the catalytic activity, soluble salt of trivalent metal and an alkaline substance are mixed, the pH value of a mixed solution is 7-13, and reaction is carried out for 6-48 hours at the reaction temperature of 60-160 DEG C so as to prepare a catalyst precursor with the pH value of 7-13; macromolecular organic matter is added into the catalyst precursor for intercalation so as to prepare an organic-matter-intercalated catalyst precursor; the organic-matter-intercalated catalyst precursor is stripped so as to prepare a stripped solution; and reduction is carried out on the stripped solution by adopting reducing gas so as to prepare the nano-scale intercalated hydrotalcite catalyst. According to the nano-scale intercalated hydrotalcite catalyst as well as the preparation method and application thereof, the nano-scale intercalated hydrotalcite catalyst has high selectivity on acetaldehyde, synthesis gas can be catalyzed and converted into the acetaldehyde, the conversion rate is high, the preparation methodis simple and easy to operate, the raw material cost for preparing the acetaldehyde can be greatly reduced, and a relatively good industrial application prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of synthesis gas conversion and utilization, in particular to a nano-scale intercalated hydrotalcite catalyst and its preparation method and application. Background technique [0002] Acetaldehyde is a low-boiling organic compound soluble in water and organic solvents. It can be condensed with formaldehyde to generate pentaerythritol, and can be condensed and hydrolyzed with cyanide ions and ammonia to synthesize alanine, which can be used to produce acetic acid, ethanol, and ethyl acetate. It can be used to synthesize pesticide DDT, can be used to prepare sleeping pills with chloral as the main component, and can also be used to prepare food additive potassium sorbate. There are following several methods for preparing acetaldehyde in the prior art: [0003] (1) Chinese patent application CN201210349547.3 discloses a catalyst for the direct dehydrogenation of ethanol to prepare acetaldehyde; the catalyst is...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J31/28B01J37/10B01J37/18C07C45/50C07C47/06B82Y30/00B82Y40/00
CPCB01J23/75B01J31/28B01J37/10B01J37/18B82Y30/00B82Y40/00C07C45/50C07C47/06
Inventor 罗明生徐舜谷庆阳
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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