摘要
以聚酰胺-胺(PAMAM)树状分子为载体,经NaBH_4湿法化学还原,制备了一系列Ni-B/GX PAMAM(X=0.5、1.5、2.5、3.5)催化剂,采用XRD、TEM、N_2物理吸附、H_2-TPD及NH_3-TPD等手段对其进行表征,并考察了其催化顺酐加氢性能。结果表明,Ni-B/GX PAMAM具有非晶态合金特征;随着PAMAM树状分子聚合程度的增大,Ni-B/GX PAMAM的酸量和分散性逐渐升高,催化顺酐加氢反应转化率达到100%,丁二酸酐选择性逐渐降低,γ-丁内酯选择性逐渐升高,且Ni-B/G3.5 PAMAM催化顺酐加氢合成γ-丁内酯的选择性达到100%。
A series of polyamidoamine（PAMAM） dendrimers supported Ni-B amorphous alloy catalysts Ni- B/GX PAMAM（X--0. 5,1. 5,2. 5,3. 5） were prepared by wet chemical reduction method with NaBH4. The catalyst samples were characterized by X-ray diffraction（XRD）, transmission electron microscope（TEM）, N2 ad- sorption, Hz temperature-programmed reduction（ H2-TPD）, and NHa temperature-programmed reduction（NHa- TPD）. The catalytic performance for hydrogenation of maleic anhydride were investigated. The results showed that Ni-B/GX PAMAM had the characteristics of amorphous alloys. With the increasing of polymerization de- gree of PAMAM dendrimers, acid content and dispersity of Ni-B/GX PAMAM samples increased gradually, conversion of maleic anhydride hydrogenation reaction reached 100%, selectivity of succinic anhydride de- creased,and selectivity of γ-butyrolactone increased. Using Ni-B/G3.5 PAMAM as catalyst for hydrogenation of maleic anhydride,the selectivity of γ-butyrolactone reached 100 %.
出处
《化学与生物工程》
CAS
2015年第12期21-24,共4页
Chemistry & Bioengineering
基金
国家自然科学基金资助项目(21073114)
