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Composite metal oxide loaded Pt-based nano metal catalyst and preparation method therefor

A composite metal and nano-metal technology, which is used in metal/metal oxide/metal hydroxide catalysts, preparation of organic compounds, preparation of hydroxyl compounds, etc. large and other problems, to achieve the effects of excellent catalytic performance, improved structural stability, and high specific surface area

Inactive Publication Date: 2016-08-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, there are many problems in the traditional supported Pt-based catalysts: 1) The specific surface area of ​​the catalyst is small, the dispersion is poor, the stability is poor, and the selectivity is low; 2) The preparation process is complicated and time-consuming, requiring high-temperature calcination, and the reduction energy consumption is large

Method used

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  • Composite metal oxide loaded Pt-based nano metal catalyst and preparation method therefor
  • Composite metal oxide loaded Pt-based nano metal catalyst and preparation method therefor
  • Composite metal oxide loaded Pt-based nano metal catalyst and preparation method therefor

Examples

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Embodiment 1

[0018] Use deionized water to prepare mixed salt solution of zirconium nitrate and cerium nitrate, chloroplatinic acid solution and potassium borohydride solution, wherein the concentration of zirconium nitrate solution is 0.0625mol / L, the concentration of cerium nitrate solution is 0.0625mol / L, and the concentration of chloroplatinic acid solution is 0.0625mol / L. It is 0.005mol / L, the concentration of potassium borohydride is 0.75mol / L, and the tetravalent metal salt solution, chloroplatinic acid solution and potassium borohydride solution are added to the colloid mill at the same time in a volume ratio of 1:1:2 at 6000rpm. It was fully stirred for 5 min to make it nucleate rapidly, and then the reacted solution was transferred to a hydrothermal reactor, crystallized at 150 °C for 24 h, then centrifuged and washed to neutrality, and finally vacuum dried at 70 °C to obtain CeO 2 -ZrO 2 Composite metal oxide-supported Pt-based nanometal catalysts. The catalyst has a surface ar...

Embodiment 2

[0021] The mixed solution of cerium nitrate and titanium tetrachloride, chloroplatinic acid solution and potassium borohydride solution were prepared with deionized water, wherein the concentration of cerium nitrate solution was 0.125mol / L, the concentration of titanium tetrachloride solution was 0.125mol / L, and the concentration of chlorine tetrachloride solution was 0.125mol / L. The concentration of platinum acid solution is 0.008mol / L, and the concentration of potassium borohydride is 1mol / L. The tetravalent metal salt solution, the chloroplatinic acid solution and the potassium borohydride solution were added to the colloid mill at the same time in a volume ratio of 1:1:2 and fully stirred at 6500 rpm for 8 minutes to make it rapidly nucleated, and then the solution after the reaction was transferred. In a hydrothermal reactor, hydrothermally reacted at 120 °C for 32 h, then centrifuged and washed until neutral, and finally vacuum-dried at 80 °C to obtain CeO 2 -TiO 2 Pt-b...

Embodiment 3

[0024] Use deionized water to prepare mixed solution of titanium tetrachloride and zirconium nitrate, chloroplatinic acid solution and potassium borohydride solution, wherein the concentration of titanium tetrachloride solution is 0.1mol / L, the concentration of zirconium nitrate solution is 0.1mol / L, and the concentration of chloroplatinum is 0.1mol / L. The concentration of the acid solution is 0.0039mol / L, and the concentration of potassium borohydride is 1.0mol / L. The tetravalent metal salt solution, the chloroplatinic acid solution and the potassium borohydride solution are added to the colloid mill at the same time in a volume ratio of 1:1:2. The solution was fully stirred at 6000 rpm for 5 min to make it nucleate rapidly, and then the reacted solution was transferred to a hydrothermal reaction kettle, hydrothermally reacted at 150 °C for 24 h, then centrifuged and washed until neutral, and finally vacuum-dried at 70 °C, get ZrO 2 -TiO 2 Pt-based nanometal catalysis suppor...

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Abstract

The invention relates to a composite metal oxide loaded Pt-based nano metal catalyst and a preparation method therefor and belongs to the technical field of preparation of catalysts. A composite metal oxide of the composite metal oxide loaded Pt-based nano metal catalyst is one of CeO2-ZrO2, TiO2-ZrO2 and ZrO2-TiO2, the specific surface area of the catalyst is 250m<2> / g to 400m<2> / g, the average particle size of Pt particles is 2nm to 5nm, and the mass percentage of Pt is 1.0% to 5.5%. According to the method, a metal salt solution, a chloroplatinic acid solution and a potassium borohydride solution are mixed in a colloid mill and then are subjected to high-speed coring, then, a hydrothermal reaction is controlled by using kinetics, then, the compositing of metal oxides and the reduction of noble metals are achieved in one step, and finally, the composite metal oxide loaded Pt-based nano metal catalyst is prepared. By applying the catalyst to a reaction for preparing cinnamyl alcohol through selective hydrogenation of cinnamyl aldehyde, the conversion ratio of the cinnamyl aldehyde and the selectivity to the cinnamyl alcohol separately can reach 90% to 100% and 90% to 100%. The catalyst has the advantages that the dispersity of metal nanoparticles is high, the size is small, the carrier action is high, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a Pt-based nano metal catalyst supported by a composite metal oxide and a preparation method. The catalyst is used for the selective hydrogenation of cinnamaldehyde. Background technique [0002] The α,β-unsaturated aldehyde and ketone structure has a pair of conjugated bonds (C=C and C=O bonds), and its various selective hydrogenation products are important raw materials in modern chemistry. Among them, cinnamaldehyde is a representative substance in α,β-unsaturated aldehydes and ketones. The selective hydrogenation product of cinnamaldehyde, cinnamyl alcohol, is widely used in the preparation of apricot, peach, raspberry, plum and other flavor flavors, cosmetic flavors and soap flavors, etc., and can also be used as an organic synthesis intermediate to synthesize a variety of drugs. raw material. [0003] Supported metal catalysts are widely used in the hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/42B01J35/10C07C29/141C07C33/32
CPCC07C29/141B01J23/002B01J23/42B01J23/63B01J35/615C07C33/32
Inventor 李峰赵一通范国利杨兰
Owner BEIJING UNIV OF CHEM TECH
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