CAJ | 학술논문

合成并表征了一类双核长链烷基咪唑阳离子修饰的过氧磷钨杂多酸盐催化剂[Dnmin]1.5PW4O24,考察了催化剂在过氧化氢为氧源的烯烃环氧化反应中的催化活性.研究表明,这类催化剂在反应过程中表现出相转移催化现象,并具有较高的催化活性和选择性.其中,双核十二烷基咪唑杂多酸盐催化剂[D12min]1.5PW4O24的活性最佳,其环己烯转化率和环氧环己烷选择性分别达到97.7%和96.3%.催化剂在经过简单离心分离后可重复使用,重复使用4次后环己烯转化率和环氧环己烷选择性仍可分别达到72.4%和97.2%.催化剂[D12min]1.5PW4O24在其它几种烯烃的环氧化反应中均表现出相转移催化特性,且具有较高的催化活性.
합성병표정료일류쌍핵장련완기미서양리자수식적과양린오잡다산염최화제[Dnmin]1.5PW4O24,고찰료최화제재과양화경위양원적희경배양화반응중적최화활성.연구표명,저류최화제재반응과정중표현출상전이최화현상,병구유교고적최화활성화선택성.기중,쌍핵십이완기미서잡다산염최화제[D12min]1.5PW4O24적활성최가,기배기희전화솔화배양배기완선택성분별체도97.7%화96.3%.최화제재경과간단리심분리후가중복사용,중복사용4차후배기희전화솔화배양배기완선택성잉가분별체도72.4%화97.2%.최화제[D12min]1.5PW4O24재기타궤충희경적배양화반응중균표현출상전이최화특성,차구유교고적최화활성.
Peroxopolyoxotungsten-based hybrid catalysts modified by dicationic long-chain alkyl imidazolium cations have been synthesized and characterized. The catalytic activity of the catalysts was meas-ured for the epoxidation of olefins with H2O2. These catalysts proved to be high catalytic activity phase transfer catalysts. In particular, for the catalyst [D12min]1.5PW4O24 modified by the dodecyl dicationic imidazolium cation, the conversion of cyclohexene and selectivity for epoxycyclohexane were 97.7%and 96.3%, respectively. After the reaction, the catalyst could be recovered simply by filtration and reused four times. The conversion of cyclohexene and selectivity for epoxycyclohex-ane were still 72.4%and 97.2%, respectively, after recycling the catalyst four times. In addition, this phase transfer catalyst can be applied to the epoxidation of a wide range of olefins.