Collagen fiber stem grafting tannic acid and method for loading palladium catalyst

A collagen fiber and palladium catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, fiber processing, etc., can solve the problems of unseen industrial applications, poor mechanical properties of natural polymer materials, and difficult industrial catalytic systems for supported catalysts. and other problems, to achieve the effect of good reusability, good chemical stability, and easy separation

Inactive Publication Date: 2008-10-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to the poor mechanical properties of natural polymer materials, the supported catalysts prepared from the above-mentioned nat

Method used

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  • Collagen fiber stem grafting tannic acid and method for loading palladium catalyst
  • Collagen fiber stem grafting tannic acid and method for loading palladium catalyst
  • Collagen fiber stem grafting tannic acid and method for loading palladium catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Select untanned pigskin scraps from tanneries as raw materials, grind them to a particle size of 0.5-2mm, and then wash them fully with deionized water to obtain pigskin collagen fibers with a moisture content of 80%, weigh 100 parts of the collagen fibers and add them to Dissolve in 100 parts of deionized water, then add 30 parts of tea tannin and react at room temperature for 2 hours, then add 7 parts of glutaraldehyde, and use hydrochloric acid with a concentration of 0.1mol / L to control the pH of the system to 7.0, and then stir and react at room temperature for 2 hours. The temperature was raised to 35° C., stirred and reacted for 3 hours, filtered and fully washed with deionized water to obtain tea tannin-grafted collagen fibers (CFGT).

[0044] Add 150 parts of deionized water to 100 parts of collagen fiber grafted tea tannins with a water content of 80%, stir for 2 hours, add 3 parts of palladium chloride (dissolved with 50 parts of deionized water earlier), and ...

Embodiment 2

[0047] In 100 parts of collagen fiber grafted tea tannin loaded palladium catalysts with a moisture content of 80% prepared in Example 1, 200 parts of 0.1mol / L sodium borohydride solution was added, and reacted for 2 hours at a temperature of 35° C., filtered And wash with absolute ethanol, and then vacuum-dry at 35 DEG C for 8 hours to obtain palladium nano-catalyst supported by collagen fiber grafted tea tannin with a particle diameter of 2-8 nm.

[0048] The transmission electron micrograph of the catalyst is shown in figure 2 As shown, it can be seen from the figure that the particle size of the palladium nanoparticles loaded on the collagen fibers is 2-3 nm.

Embodiment 3

[0050] Select untanned cowhide scraps from tanneries as raw materials, crush them to a particle size of 0.5-2mm, and wash them thoroughly with deionized water to obtain cowhide collagen fibers with a moisture content of 80%. Weigh 100 parts of the collagen fiber and add it to 300 parts of deionized water to dissolve, then add 50 parts of tea tannin to react at room temperature for 3 hours, then add 6 parts of formaldehyde, and use hydrochloric acid with a concentration of 0.1mol / L to control the pH of the system to 5.0. After stirring and reacting for 3 hours, the temperature was raised to 30° C., stirred and reacted for another 2 hours, filtered and fully washed with deionized water to obtain tea tannin-grafted collagen fibers (CFGT).

[0051] Add 200 parts of deionized water to 100 parts of collagen fiber grafted tea tannins with a water content of 80%, stir for 4 hours, add 6 parts of palladium acetate (dissolved with 50 parts of deionized water earlier), and use a concentra...

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Abstract

The invention discloses a method for grafting collagenous fiber with tannin, which includes the following steps: the collagenous fiber is added into water by dry weight for dissolving, the vegetable tannin is added for reacting under room temperature for 2 to 6 hours, then crosslinking agent is added and the pH valve of the system is controlled to be 5.0 to 7.5, then the temperature is raised to 30 to 45 DEG C after the stirring reaction is carried out for 2 to 4 hours, and then the stirring reaction is carried out again for 2 to 6 hours, thus, the grafting is finally finished after filtering and washing. The invention also discloses a method for loading palladium catalyst in the process of grafting the collagenous fiber with the tannin, and the method includes the following steps: deionized water is added in the process of grafting the collagenous fiber with the tannin to be stirred for 2 to 4 hours, then palladium is added and the pH value of the system is controlled to be 3.5 to 5.5, then the stirring reaction is carried out under the temperature of 25 to 35 DEG C for 2 to 8 hours, and then the reaction is carried out again for 2 to 6 hours after the temperature is raised to 40 to 50 DEG C, and finally the un-reacted palladium is removed by filtering and washing or the reaction is continued to reduce the palladium to obtain the palladium nanometer catalyst loaded in the process of grafting the collagenous fiber with the tannin. The catalyst obtained by the method of the invention has the advantages of little possibility of falling off, high thermal stability, good accessibility of mass transfer, high catalytic reaction activity and good reusability.

Description

technical field [0001] The invention belongs to the technical field of preparation of heterogeneous palladium metal catalysts, in particular to a method for grafting collagen fibers with tannins and palladium catalysts. Background technique [0002] The foundation of modern chemical industry is based on the catalytic conversion of petroleum, coal and natural gas, and catalyst is the core of catalytic conversion (Yan Zifeng. Nano Catalytic Technology [M]. Chemical Industry Press, Beijing, 2003). As one of the noble metal catalysts, metal palladium has shown a very important role in the field of industrial catalysis due to its high catalytic activity, good selectivity, low dosage, short reaction cycle and mild reaction conditions (Chen Qingling. Nanocatalysis Application progress of technology. Modern Chemical Industry. 2004, 24(7): 20-25), and this type of catalyst is especially suitable for a series of reactions such as catalytic hydrogenation and catalytic oxidation. [00...

Claims

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Application Information

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IPC IPC(8): D06M13/152D06M13/127D06M13/123D06M13/35D01F11/02D06M11/83B01J31/28B01J35/06D06M101/14
Inventor 廖学品石碧吴昊
Owner SICHUAN UNIV
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