催化学报
催化學報
최화학보
CHINESE JOURNAL OF CATALYSIS
2015年
3期
425-431
,共7页
固体酸催化剂%磁性%Aldol反应%不对称催化%水相
固體痠催化劑%磁性%Aldol反應%不對稱催化%水相
고체산최화제%자성%Aldol반응%불대칭최화%수상
Solid acid catalyst%Magnetism%Aldol reaction%Asymmetric catalysis%Aqueous phase
以纳米磁性材料Fe3O4, ZrOCl2·8H2O和硫酸为原料,在不同焙烧温度下制备了纳米磁性固体酸催化剂SO42–/Zr(OH)4-Fe3O4.详细表征了该磁性固体酸的SO42–负载量、酸分布、表面形貌和孔结构等特性.在含有硝基和氰基强吸电子基苯甲醛的不对称水相Aldol反应中, SO42–/Zr(OH)4-Fe3O4表现出优良的催化性能(83%–100%收率,86.0%–95.6% eeanti和anti/syn =88–96/12–4).该类磁性固体酸可在外加磁体作用下定量地从催化反应体系中分离并回收使用,重复使用5次未见显著失活.
以納米磁性材料Fe3O4, ZrOCl2·8H2O和硫痠為原料,在不同焙燒溫度下製備瞭納米磁性固體痠催化劑SO42–/Zr(OH)4-Fe3O4.詳細錶徵瞭該磁性固體痠的SO42–負載量、痠分佈、錶麵形貌和孔結構等特性.在含有硝基和氰基彊吸電子基苯甲醛的不對稱水相Aldol反應中, SO42–/Zr(OH)4-Fe3O4錶現齣優良的催化性能(83%–100%收率,86.0%–95.6% eeanti和anti/syn =88–96/12–4).該類磁性固體痠可在外加磁體作用下定量地從催化反應體繫中分離併迴收使用,重複使用5次未見顯著失活.
이납미자성재료Fe3O4, ZrOCl2·8H2O화류산위원료,재불동배소온도하제비료납미자성고체산최화제SO42–/Zr(OH)4-Fe3O4.상세표정료해자성고체산적SO42–부재량、산분포、표면형모화공결구등특성.재함유초기화청기강흡전자기분갑철적불대칭수상Aldol반응중, SO42–/Zr(OH)4-Fe3O4표현출우량적최화성능(83%–100%수솔,86.0%–95.6% eeanti화anti/syn =88–96/12–4).해류자성고체산가재외가자체작용하정량지종최화반응체계중분리병회수사용,중복사용5차미견현저실활.
Magnetic solid acid catalysts SO42?/Zr(OH)4–Fe3O4 were prepared using magnetic Fe3O4 nanoparti‐cles, ZrOCl2·8H2O, and sulfuric acid as starting materials in the calcination temperature range 110–650 °C. The properties of the magnetic solid acid, such as loaded SO42?content, acid distribu‐tion, surface morphology, and porous structure, were characterized. In the aqueous asymmetric aldol reaction of various benzaldehydes with strong electron‐withdrawing groups (R=NO2 and CN), good to excellent catalytic performance (83%–100%yield, 86.0%–95.6%ee anti, and anti/syn=88–96/12–4) was achieved. These nanomagnetic solid acids can be quantitatively recycled from the reaction mixture using an external magnet and reused five times without significant loss of catalytic activity.
