Ni-Cu作用对于1,4-丁炔二醇一步法低压加氢的影响

采用沉积沉淀法将金属助剂引入Ni/Al₂O₃催化剂，考察不同金属助剂对于BYD加氢体系的影响，进一步优选助剂的最佳含量，并结合BET、XRD、H₂-TPR、EDX-MAPPING、TEM、XPS、NH₃-TPD等表征手段对催化剂物化性质进行研究。结果表明，金属助剂的添加主要影响了活性组分与载体间相互作用，成为影响催化活性的主要原因。Cu与Fe的引入使催化剂中Ni²⁺与载体之间相互作用明显减弱，提高了还原性能，BYD转化率提高至95%。通过考察优选金属助剂Cu含量对于催化剂物化性质的影响，发现使Ni²⁺与载体间相互作用力减弱的主要原因在于Cu表面氢溢流现象，然而，较多还原后的Ni颗粒由于与载体间的弱相互作用，易发生团聚，对加氢过程造成不利影响，通过Ni-Cu金属作用可有效地将金属固定于在载体表面，避免粒子迁移、团聚，Cu添加量5%时，催化剂凭借较多分散度良好的活性组分和适宜酸性，最终表现出最优加氢性能。

Effect of Ni-Cu on the one-step mild pressure hydrogenation of 1,4-butynediol

The deposition-precipitation method was employed for the purpose of bringing in metallic promoters into Ni/Al₂O₃ catalysts. The effects of various metallic promoters on the catalytic performance in 1,4-butynediol (BYD) hydrogenation were investigated. Besides, the contents of the suitable promoter were further studied, which were combined with BET, XRD, H₂-TPR, EDX-MAPPING, TEM, XPS, and NH₃-TPD techniques, aimed at exploring physico-chemical characteristics in catalysts. As the findings suggested, the addition of different promoters substantially impacted the interaction between Ni²⁺ and support, acting as the key factor impacting the catalytic performance. The introduction of Cu and Fe had the potential to prominently lower the strong interaction between Ni²⁺ and support for the improvement of the BYD conversion of 95%. Furthermore, different contents of Cu were further studied and discovered that it was the phenomenon of hydrogen spillover arisen on Cu surfaces, efficiently lowering the interaction between Ni²⁺ and support. Nevertheless, the aggregation in Ni particles cannot be evitable, but for the existence of Ni-Cu alloying in Cu-added catalysts. As the Cu content reached up to 5%, the catalyst manifested the excellent catalytic performance in hydrogenation owing to the abundant amount of Ni⁰ active sites in the form of the high dispersion and the fitting acidity.