化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2013年
8期
1825-1831,1844
,共8页
超临界流体沉积%负载型金属催化剂%溶解%吸附%还原
超臨界流體沉積%負載型金屬催化劑%溶解%吸附%還原
초림계류체침적%부재형금속최화제%용해%흡부%환원
supercritical fluid deposition%supported metal catalyst%dissolution%adsorption%reduction
综述了近年来超临界流体沉积技术在制备负载型金属纳米催化剂方面的应用及研究进展，介绍了近年来学者们利用超临界流体特殊的溶剂化特征、近乎于零的表面张力、高扩散系数、低黏度、易调变等优势，制备负载型金属纳米催化剂的研究成果。主要从超临界流体沉积过程中金属前驱盐的溶解、吸附、还原3个方面分别进行了阐述。集中讨论了对沉积效果影响显著的溶解度、吸附热力学、扩散动力学以及还原方法等问题。此外，还针对目前超临界流体沉积技术在制备金属纳米复合材料中所遇到的提高金属利用率、颗粒尺寸控制、分散性等焦点问题进行了讨论。
綜述瞭近年來超臨界流體沉積技術在製備負載型金屬納米催化劑方麵的應用及研究進展，介紹瞭近年來學者們利用超臨界流體特殊的溶劑化特徵、近乎于零的錶麵張力、高擴散繫數、低黏度、易調變等優勢，製備負載型金屬納米催化劑的研究成果。主要從超臨界流體沉積過程中金屬前驅鹽的溶解、吸附、還原3箇方麵分彆進行瞭闡述。集中討論瞭對沉積效果影響顯著的溶解度、吸附熱力學、擴散動力學以及還原方法等問題。此外，還針對目前超臨界流體沉積技術在製備金屬納米複閤材料中所遇到的提高金屬利用率、顆粒呎吋控製、分散性等焦點問題進行瞭討論。
종술료근년래초림계류체침적기술재제비부재형금속납미최화제방면적응용급연구진전，개소료근년래학자문이용초림계류체특수적용제화특정、근호우령적표면장력、고확산계수、저점도、역조변등우세，제비부재형금속납미최화제적연구성과。주요종초림계류체침적과정중금속전구염적용해、흡부、환원3개방면분별진행료천술。집중토론료대침적효과영향현저적용해도、흡부열역학、확산동역학이급환원방법등문제。차외，환침대목전초림계류체침적기술재제비금속납미복합재료중소우도적제고금속이용솔、과립척촌공제、분산성등초점문제진행료토론。
This is a summary on progress in the preparation of supported nanoscale metal catalysts via supercritical fluid deposition. Taking advantage of supercritical fluids with nearly zero surface tension, gas-like diffusion coefficient,low viscosity,liquid-like high solvent efficiency and adjustability,many authors have successfully prepared the metal nanoparticles supported on porous materials. In terms of dissolution,adsorption and reduction of metal precursors during supercritical fluid deposition,recently reported achievements are summarized and discussed,especially regarding solubility,adsorption thermodynamics and diffusion kinetics. In addition,the improvement on metal utilization rate,particle size control and dispersity confronted in the fabrication of metal nanocomposites by the supercritical fluid deposition are discussed.
