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Ni-P/SiO₂催化剂晶化过程及其加氢活性研究

The Crystallization Process and the Hydrogenation Activity of Ni-P/SiO₂ Catalyst

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【Author】 Sheng Chun; Zhou Shiyao(Experimental Center Shanghai Normal University Shanghai 200234)Li Hexing Deng Jingfa(Department of Chemistry Fudan University ,Shanghai 200433)

【机构】上海师范大学实验中心!上海； 200234；复旦大学化学系!上海； 200433；

【摘要】采用化学还原法制备了负载型Ni－P／SiO2非晶态合金催化剂．应用ICP、BET、氢氧滴定法、XRD、SEM、XPS研究了上述催化剂在高温晶化过程中的表面结构、表面形貌和表面电子态的变化。测定了Ni－P／SiO2非晶态合金晶化前后对其液相苯甲醛加氢反应催化活性和选择性,并讨论了非晶态合金催化剂晶化过程中结构变化对催化性能的影响．更多还原

【Abstract】 The Ni-P amorphous alloy support on SiO2 (Ni-P/SiO2) was prepared by chemicalreduction with NaH2PO2. The amorphous structure of the as-prepared sample was determined byXRD in which a broad peak around 2 = 45 was observed. It’s crystallization process was carriedout by heating the sample at 350℃ and 600℃ in N2 flow for 2 hours. respectively. The as- prepared catalys before and after crystallization was characteriaed by ICP,BET,XRD,XPS and SEM. The change of its calalytic activity before and after crystallization was measured throughthe liquid benzaldehyde(BA ) hydrogenation in term of the hydrogen uptake rate per gram or perarea of nickel or the conversion of BA and TOF values. The change was discussed according tothe above characterizations.更多还原