首页|Cu,N codoped carbon nanosheets encapsulating ultrasmall Cu nanoparticles for enhancing selective 1,2-propanediol oxidation
Cu,N codoped carbon nanosheets encapsulating ultrasmall Cu nanoparticles for enhancing selective 1,2-propanediol oxidation
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In the selective oxidation of biomass-based 1,2-propanediol(PDO)with oxygen as the terminal oxidant,it is challenging to improve the lactic acid(LA)selectivity for nonnoble metal nanoparticles(NPs)due to their limited oxygen reduction rate and easy C-C cleavage.Given the high economic feasibility of nonno-ble metals,i.e.,Cu,in this work,copper and nitrogen codoped porous carbon nanosheets encapsulating ultrafine Cu nanoparticles(Cu@Cu-N-C)were developed to realize highly selective of PDO oxidation to LA.The carbon-encapsulated ultrasmall Cu0 NPs in Cu@Cu-N-C have high PDO dehydrogenation activity while N-coordinated Cu(Cu-N)sites are responsible for the high oxygen reduction efficacy.Therefore,the performance of catalytic PDO conversion to LA is optimized by a proposed pathway of PDO → hydroxylacetone → lactaldehyde → LA.Specifically,the enhanced LA selectivity is 88.5％,and the PDO conversion is up to 75.1％in an O2-pressurized reaction system(1.0 MPa O2),superior to other Cu-based catalysts,while in a milder nonpressurized system(O2 flow rate of 100 mL min-1),a remark-able LA selectivity(94.2％)is obtained with 39.8％PDO conversion,2.2 times higher than that of supported Au nanoparticles(1％Au/C).Moreover,carbon encapsulation offers Cu@Cu-N-C with strong leaching resistance for better recycling.
Selective oxidationCopper and nitrogen doped carbon1,2-PropanediolUltrasmall Cu nanoparticlesLactic acid
Yonghai Feng、Min Yu、Minjia Meng、Lei Liu、Dewei Rao
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Institute for Advanced Materials,School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China
School of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China
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