CAJ | 학술논문

利用先共沉淀后水热处理的方法制备出水滑石前体,将其焙烧后,得到具有不同Mg/Al摩尔比的复合氧化物,并借助电感耦合等离子原子发射光谱、XRD、CO2-TPD和氮气吸脱附等手段对其进行表征。结果表明,Mg/Al摩尔比对催化剂的结构和碱性质有较大的影响,并且在催化丙酮和碳酸二甲酯合成乙酰乙酸甲酯的反应中,其比单纯的氧化镁和氧化铝表现出了更高的催化活性。进一步的研究表明,在该反应中是复合氧化物的中强碱性位起催化活性的作用,当Mg/Al摩尔比为2时,催化剂具有最高的活性。此外,重复性实验表明,这些催化剂具有较好的稳定性和重复使用性。
이용선공침정후수열처리적방법제비출수활석전체,장기배소후,득도구유불동Mg/Al마이비적복합양화물,병차조전감우합등리자원자발사광보、XRD、CO2-TPD화담기흡탈부등수단대기진행표정。결과표명,Mg/Al마이비대최화제적결구화감성질유교대적영향,병차재최화병동화탄산이갑지합성을선을산갑지적반응중,기비단순적양화미화양화려표현출료경고적최화활성。진일보적연구표명,재해반응중시복합양화물적중강감성위기최화활성적작용,당Mg/Al마이비위2시,최화제구유최고적활성。차외,중복성실험표명,저사최화제구유교호적은정성화중복사용성。
A series of Mg/Al mixed oxides with different Mg/Al mole ratios were prepared by calcining hydrotalcite obtained via the co-precipitation method followed hydrothermal treatment.The samples were characterized by using ICP,XRD,CO2-TPD and N2adsorption/desorption techniques.The results showed that the structure and basicity of samples were affected by Mg/Al mole ratio.Besides,these Mg/Al mixed oxides were effective catalysts for the synthesis of methyl acetoacetate from acetone and dimethyl carbonate.More importantly,they all presented much higher catalytic ability than the pure MgO or Al2O3.At the same time,the catalytic performance of mixed oxides was correlated with their moderate basicity,and the catalyst exhibited the highest catalytic ability when the initial Mg/Al mole ratio was 2.Furthermore,reusability test indicated that these Mg/Al mixed oxides presented good stability and reusability.