Active component morphology controllable loaded noble metal catalyst and preparation method thereof

A technology of noble metal catalysts and active components, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Low activity and selectivity, complex preparation methods and other problems, to achieve the effect of improving selectivity and activity, simple preparation method, and improving utilization rate

Inactive Publication Date: 2012-07-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, the traditional preparation methods of supported noble metal catalysts are complicated, the active components are agglomerated with each other and the morphology is not easy to control, and the catalytic activity and selectivity are relatively low.

Method used

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  • Active component morphology controllable loaded noble metal catalyst and preparation method thereof
  • Active component morphology controllable loaded noble metal catalyst and preparation method thereof
  • Active component morphology controllable loaded noble metal catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A. Weigh 0.0207g NaCl and 0.0314g PdCl at a molar ratio of 2:1 2 Dissolved in 10ml of deionized water, prepared as metal Pd precursor Na 2 PdCl 4 solution;

[0036] B. Weigh 1.504gMg(NO 3 ) 2 ·6H 2 O, 1.097gAl(NO 3 ) 3 9H 2 O was dissolved in 80mL deionized water to prepare a metal salt solution, stirred until completely dissolved, then added the mixed solution prepared in step A, and stirred evenly;

[0037] C. Weigh 2.878g of hexamethylenetetramine (HMT), and dissolve it in the mixed solution prepared in step B under ice bath conditions;

[0038] D. Transfer the above mixed solution to a hydrothermal kettle, and conduct a crystallization reaction at 130° C. for 6 hours. The obtained product was washed and centrifuged until the supernatant had a pH value of 7, and the filter cake was dried in an oven at 70°C to obtain a Tetra-Pd-LDHs sample.

[0039] The XRD spectrogram, HRTEM photograph and XPS spectrogram of this catalyzer are respectively in the accompanyi...

Embodiment 2

[0041] A. Weigh 0.0217g NaCl and 0.0314g PdCl at a molar ratio of 2:1 2 Dissolved in 10ml of deionized water, prepared as metal Pd precursor Na 2 PdCl 4 solution;

[0042] B. Weigh 1.504gMg(NO 3 ) 2 ·6H 2 O, 1.097gAl(NO 3 ) 3 9H 2 O was dissolved in 80mL deionized water to prepare a metal salt solution, added the solution prepared in step A, and stirred evenly;

[0043] C. Add 1.300g of cetyltrimethylammonium bromide (CTAB) into solution B, stir until completely dissolved, then add 2.878g of hexamethylenetetramine (HMT), and stir in an ice bath. to obtain a homogeneous solution;

[0044] D. Transfer the above mixed solution to a hydrothermal kettle, and conduct a crystallization reaction at 130° C. for 6 hours. The obtained product was washed and centrifuged until the supernatant had a pH value of 7, and the filter cake was dried in an oven at 70°C to obtain the octa-Pd-LDHs sample.

Embodiment 3

[0046] Step A is with embodiment 1;

[0047] B. Weigh 0.705gMgSO 4 ·7H 2 O, 1.000gAl(SO 4 ) 2 16H 2 O was dissolved in 80mL deionized water to prepare a metal salt solution, added to the prepared solution in step A, and stirred evenly;

[0048] C, 0.177gPVP and 5ml concentration are that 1mmol / L KBr solution joins in solution B, stirs until fully dissolving, then adds 10ml dehydrated alcohol and 3.784g urea ((NH 2 ) 2 CO), fully stirred to obtain a homogeneous solution;

[0049]D. Transfer the above mixed solution to a hydrothermal kettle, and conduct a crystallization reaction at 130° C. for 6 hours. The obtained product was washed and centrifuged until the supernatant had a pH value of 7, and the filter cake was dried in an oven at 70°C to obtain a cubic-Pd-LDHs sample.

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Abstract

The invention relates to an active component morphology controllable loaded noble metal catalyst which uses hydrotalcite as a carrier and is prepared by a precipitation-reduction method. A precipitating agent, a reducing agent, a surfactant, an etchant, a soluble salt solution of +2 and +3-valence metal ions forming the hydrotalcite, and an active component precursor solution are subjected to mixed crystallization, the +2 and +3-valence metal ions are nucleated and grown into the hydrotalcite in an alkaline environment provided by the precipitating agent, and meanwhile, the active component precursor is reduced to 0 valence, and the active component has specific uniform morphology, i.e., the active component morphology controllable loaded noble metal catalyst using the hydrotalcite as the carrier is obtained by one-step reaction. Since the kinetic rate is the key to control the morphology of the active component, and different reducing agents, surfactants and etchants can affect the dynamic process of reduction of the active component, the active component morphology controllable loaded noble metal catalyst of controllable preparation can be attained by controlling the reducing agents, the surfactants and the etchants.

Description

technical field [0001] The invention relates to a loaded noble metal catalyst with hydrotalcite as a carrier and adjustable active component morphology and a preparation method thereof. The catalyst can be applied to various reaction processes in petrochemical, organic chemistry and other fields. Background technique [0002] Supported noble metal catalyst is a catalyst that supports noble metal components on a carrier to improve the dispersion and thermal stability of the noble metal components, so that the catalyst has a suitable pore structure, shape and mechanical strength. Factors affecting the catalytic performance of supported noble metal catalysts mainly include: the nature of the carrier, the particle size and microscopic morphology of the active component, the use of co-catalysts, and the interaction between the carrier and the active component. Among them, the shape and size of the noble metal particles It is a key factor affecting catalyst activity and selectivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/42B01J23/89B01J23/50
Inventor 冯俊婷贺宇飞李殿卿冯拥军
Owner BEIJING UNIV OF CHEM TECH
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