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以氯化钌为活性前驱体,活性炭为载体,采用超临界CO2沉积技术制备了负载钌/炭催化剂,以葡萄糖催化加氢反应考察了催化剂的活性,研究了助溶剂种类,助溶剂用量,超临界压力对催化剂活性的影响,并用SEM、XRD、XPS对催化剂表面的形貌、晶形及钌分布情况进行了表征。结果表明:超临界CO2沉积技术可有效提高负载钌炭催化剂的活性,在实验范围内,当助溶剂为甲醇,用量为2ml,超临界CO2压力为12.0MPa时制得催化剂的活性最佳,其催化活性是传统水浸渍方法制得样品的1.48倍;钌在催化剂中以无定型的非晶形式存在,钌在活性炭表面均匀分布,超临界沉积技术进一步增强了活性组分钌和载体间的相互作用。
Ruthenium chloride as the active precursor and activated carbon as the carrier, the use of supercritical CO2 deposition technology prepared ruthenium / carbon catalyst, glucose catalytic hydrogenation reaction was investigated the activity of the catalyst, studied the type of co-solvent, cosolvent dosage, super The influence of critical pressure on the catalyst activity was investigated. The morphology, crystal shape and ruthenium distribution of the catalyst were characterized by SEM, XRD and XPS. The results show that the supercritical CO2 deposition technology can effectively increase the activity of the catalyst supported on ruthenium. In the experimental range, when the cosolvent is methanol, the dosage is 2ml, the supercritical CO2 pressure is 12.0MPa, The catalytic activity is 1.48 times that of the traditional water immersion method. Ruthenium exists as an amorphous amorphous phase in the catalyst. Ruthenium is uniformly distributed on the surface of the activated carbon. The supercritical deposition technique further enhances the interaction between the active component ruthenium and the support effect.