CAJ | 학술논문

以超临界二氧化碳(scCO_2)/聚乙二醇(PEG)两相为反应介质,双齿氮配体功能化聚乙二醇稳定的Pd纳米颗粒作为催化剂,进行了醇的需氧氧化反应.系统研究了催化剂制备条件和反应条件对苯甲醇需氧氧化反应的影响.结果表明,以氢气为还原剂制备的Pd纳米粒子的催化活性最高.反应结束后,可以利用seCO_2直接进行原位萃取得到产物,实现了催化剂与产物的有效分离和催化剂的循环使用.反应中没有检测剑钯的流失.催化剂经过5次循环利用后转化率仍可达98%.
이초림계이양화탄(scCO_2)/취을이순(PEG)량상위반응개질,쌍치담배체공능화취을이순은정적Pd납미과립작위최화제,진행료순적수양양화반응.계통연구료최화제제비조건화반응조건대분갑순수양양화반응적영향.결과표명,이경기위환원제제비적Pd납미입자적최화활성최고.반응결속후,가이이용seCO_2직접진행원위췌취득도산물,실현료최화제여산물적유효분리화최화제적순배사용.반응중몰유검측검파적류실.최화제경과5차순배이용후전화솔잉가체98%.
The aerobic oxidation of various alcohols to the corresponding aldehydes or ketones was carried out using stabilized palladium nanoparticles in a supercritical carbon dioxide(scCO_2)/poly(ethylene glycol)(PEG-2000)biphasie system.The effects of reaction conditions on catalytie activity were investigated in detail.Among the Pd nano-catalysts reduced with different reductants,Pd nanoparticles obtained by H2 reduction showed the best catalytic performance in the oxidation of benzyl alcoh01.The products Call be easily extracted with scCO_2 in situ from the Pd nano-catalyst immobilized in functionalized poly(ethylene glycol),and therefore the loss of palladium could be eliminated.The conversion reached 98% after the catalyst was reused 5 times.