| 赵永祥,武志刚.溶胶—凝胶法制备NiO／SiO2催化剂研究[J].分子催化,2001,(5):369-373 |
| 溶胶—凝胶法制备NiO／SiO2催化剂研究 |
| Study on the NiO/SiO2 Catalysts Prepared by Sol-Gel Method |
| 修订日期：2001-04-13 |
| DOI： |
| 中文关键词: 溶胶－凝胶法 NiO／SiO2催化剂 催化加氢 氧化镍 顺酐 选择性 二氧化硅负载催化剂 丁二酸酐 |
| 英文关键词:Sol\| Gel,NiO/SiO\-2 catalyst,Catalytic hydrogenation |
| 基金项目:山西省自然科学基金，， |
| 赵永祥 武志刚 |
| [1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室，甘肃兰州730000 [2]山西大学化学系，山西太原 |
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| 全文下载次数: 28 |
| 中文摘要: |
| 分别以正硅酸乙酯、硝酸镍为硅源和镍源，采用溶胶－凝胶法，经超临界流体干燥和普通干燥制备了NiO-A-SiO2、NiO-G-SiO2催化剂；以气凝胶和干凝胶为载体，采用浸渍法制备了NiO/A-SiO2、NiO/G-SiO2催化剂。并用XRD、TEM、BET、TPR等手段，研究了制备方法对催化剂织构、结构和Ni物种存在形态的影响，发现NiO-A-SiO2和NiO-G-SiO2催化剂上高度分散的NiO簇团与SiO2之间有较强的相互作用，其顺酐液相选择加氢转化率低于10％；NiO/G-SiO2催化剂上，以单一物种形态存在的NiO与SiO2相互作用弱，顺酐转化率为42％；NiO/A-SiO2催化剂上，以多种形态存在的微量NiO与SiO2间的相互作用较复杂，其顺酐液相选择加氢的转化率和丁二酸酐的选择性分别可达100％和98％。 |
| 英文摘要: |
| Using Ni(NO\-3)\-2 and TEOS as nickel and silica sources, NiO\|SiO\-2 catalysts were prepared by Sol\|Gel\|SCFD and general dry methods(designated by NiO\|A\|SiO\-2 and NiO\|G\|SiO\-2, respectively), NiO\|SiO\-2 catalysts were also prepared by impregnation of SiO\-2 aerogel and xerogel, both of which was prepared by Sol\|Gel(designated by NiO/A\|SiO\-2 and NiO/G\|SiO\-2, respectively). The effects of preparation methods on the texture, structure and the existing forms of NiO species of Ni\|based catalysts were investigated using TEM, BET, XRD and TPR. The results show that NiO\|A\|SiO\-2 and NiO\|G\|SiO\-2 catalysts have the same texture and structure with a strong interaction between NiO and SiO\-2, since small NiO clusters are uniformly distributed inside the support material. These catalysts have a conversion of MA less than 10% in catalytic hydrogenation. The NiO/G\|SiO\-2 catalyst has a very weak interaction between NiO and SiO\-2 due to the existence of NiO in single form, which has a 42% conversion of MA. The NiO/A\|SiO\-2 catalyst has different forms of NiO species and an moderate interaction with SiO\-2, it shows the highest performance in catalytic hydrogenation, conversion of MA 100% and selectivity to SA more than 98%. |
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