Compound catalyst with palladium and surface-functionalized carbon quantum dots carried by mesoporous carbon microsphere, preparation method and application of compound catalyst

Abstract

The invention discloses a compound catalyst with palladium and surface-functionalized carbon quantum dots carried by mesoporous carbon microsphere, a preparation method and an application thereof. Thecompound catalyst is composed of a mesoporous carbon microsphere carrier and surface-functionalized carbon quantum dots and metal palladium carried by the carrier, wherein dispersing 'snowflakes' areformed on the carrier surface by surface-functionalized carbon quantum dots and metal palladium; a surface-functionalized carbon quantum dot in size of not more than 10nm, which is directly loaded onthe carrier, is served as the center of each 'snowflake'; metal palladium is located by taking each surface-functionalized carbon quantum dot as an anchor and grows in the shape of snowflake around each surface-functionalized carbon quantum dot; the size of each 'snowflake' is within 40nm-100nm; N functional groups are introduced into the carbon quantum dots, so as to form the surface-functionalized carbon quantum dots; N functional groups are one or more of amino, pyridine nitrogen, pyrrolic nitrogen and graphite nitrogen. The invention also provides the application of the catalyst in the reaction of selective catalytic hydrogenation of crotonaldehyde for compounding crotyl alcohol.

Description

(1) Technical field [0001] The invention relates to a composite catalyst of palladium loaded on mesoporous carbon microspheres and surface functionalized carbon quantum dots, a preparation method thereof and an application in the selective catalytic hydrogenation reaction of crotonaldehyde to prepare crotyl alcohol. (2) Technical background [0002] Crotonaldehyde is a representative α,β-unsaturated aldehyde. Hydrogenation of crotonaldehyde can produce a series of products such as butyraldehyde, crotyl alcohol, enol and butanol. Among them, the C=O selective hydrogenation product—crotyl alcohol has wide application value and can be used in the synthesis of spices, medicines and fine chemicals. At present, the commonly used methods for preparing crotyl alcohol include lithium aluminum hydride reduction method, sodium borohydride reduction method and metal catalytic hydrogenation method. However, the first two methods have disadvantages such as high price, difficult product s...

AI Technical Summary

Problems solved by technology

Although their catalytic activity is relatively high, the selectivity is generally low

Researchers usually add additives (Van Broekhoven E.H.PonecV.Surface chemistry of small particles[J].Surf.Sci.,1985,162(1-3):731-741), change catalyst support (Planex J M. , Coustel N., Brotons V., Kumbhar P.S., Dutartre R., Geneste P., Ajayan P.M. Appication of Carbon Nanotures as Supports in Heterogeneous Catalysis[J], J.Am.Chem.Soc.,1994,116(17):7935 -7936), change the spatial structure of metals (Richard D., Fouilloux P., GallezotP.Structure and selectivity in cinnamaldehyde hydrogenation of new platinumcatalysts on high surface area grapjite[C].Proc.Int.Congr, Catal.9th, Ottawa: Chem.Inst.Of.Canada, 1988 (3): 1074-1081) to solve this problem, but these methods, not only complicated operation, but also increased the cost of equipment and catalyst

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