CAJ | 학술논문

用沉积-沉淀-水合肼还原法制备氧化石墨烯（GO）、石墨（graphite）、酸化石墨（graphite-H）负载的 Pt 催化剂，研究了它们对肉桂醛选择性加氢生成肉桂醇反应的催化性能，并对该催化剂进行多晶 X 射线衍射、透射电镜、拉曼光谱、N2吸附和 X 射线光电子能谱表征。结果表明：3种制备的催化剂中，负载 Pt 后氧化石墨烯被水合肼还原生成还原氧化石墨烯（RGO），具有最高的比表面积，表面 Pt 的含量较低，所得 Pt 颗粒的粒径最小，具有最高的肉桂醛转化率；RGO 含有较多的酸性含氧基团 C—OH 及 COOH，有利于肉桂醛的=C O 吸附，因此 Pt／RGO 具有最高的肉桂醇选择性。此外，还考察了 Pt／RGO 催化性能与温度、氢气压强、反应时间的关系。实验表明，最佳反应温度为85℃，时间为3 h，H2压力为2．0 MPa。
용침적-침정-수합정환원법제비양화석묵희（GO）、석묵（graphite）、산화석묵（graphite-H）부재적 Pt 최화제，연구료타문대육계철선택성가경생성육계순반응적최화성능，병대해최화제진행다정 X 사선연사、투사전경、랍만광보、N2흡부화 X 사선광전자능보표정。결과표명：3충제비적최화제중，부재 Pt 후양화석묵희피수합정환원생성환원양화석묵희（RGO），구유최고적비표면적，표면 Pt 적함량교저，소득 Pt 과립적립경최소，구유최고적육계철전화솔；RGO 함유교다적산성함양기단 C—OH 급 COOH，유리우육계철적=C O 흡부，인차 Pt／RGO 구유최고적육계순선택성。차외，환고찰료 Pt／RGO 최화성능여온도、경기압강、반응시간적관계。실험표명，최가반응온도위85℃，시간위3 h，H2압력위2．0 MPa。
Oxidized graphene (GO),graphite and nitric acid treated graphite (graphite-H)supported Pt catalysts were prepared through deposition-precipitation-hydrazine reduction method and their selective hydrogenation performances for cinnamaldehyde (CAL)to cinnamyl alcohol (COL)were investigated.The catalysts were characterized by X-ray diffraction,transmission electron microscopy,Raman spectrum,N2 physisorption and X-ray photoelectron spectroscopy techniques.The characterization indicate that GO is reduced to graphene (RGO)during the catalyst preparation,Pt/RGO has the highest specific surface area,the lowest surface Pt loading and the smallest Pt particle size,leading to the highest cinnamaldehyde conversion.XPS results show that RGO surface has many acidic oxygenic functional groups such as C—OH and COOH,in favor of the adsorp=tion of C O,giving high cinnamyl alcohol selectivity.In addition,the studies demonstrate that the optimal reaction condition of Pt/RGO catalyst is at 85 ℃,2.0 MPa and 3 h.