Maghemite nanoparticles modified with polyvinylpyrrolidone were synthesized using the chemical co-precipitation method. Palladium ions have then been immobilized on the PVP/γ-Fe₂O₃ magnetic support. The Pd-PVP/γ-Fe₂O₃ catalyst obtained was characterized using X-ray diffraction, thermogravimetry coupled with differential scanning calorimetry and quadrupole mass spectrometry, scanning electron microscopy combined with energy dispersive X-ray analysis, transmission electron microscopy, nitrogen adsorption–desorption and vibrating sample magnetometry. Morphology, microstructure, particle sizes and textural properties of the Pd-PVP/γ-Fe₂O₃ were compared with those of the unmodified Pd/γ-Fe₂O₃ catalyst, synthesized using the same method. The polymer has affected the size of γ-Fe₂O₃ nanoparticles and their agglomeration, forming compact microstructure with decreased mesopores (4.5 nm). Palladium nanoparticles with size of 3–5 nm were found both on the surface of the PVP/γ-Fe₂O₃ particles (6–10 nm) and inside the pores formed by them. The Pd-PVP/γ-Fe₂O₃ has demonstrated improved catalytic properties in phenylacetylene hydrogenation under mild conditions of 40 °C and 0.1 MPa, compared to Pd/γ-Fe₂O₃ and similar catalysts prepared using polyethylene glycol and pectin. The hydrogenation rate of C–C triple bond on Pd-PVP/γ-Fe₂O₃ achieved 2.8 × 10^–6 mol s⁻¹ and selectivity to styrene was 92%. The catalyst showed weak ferromagnetic and soft magnetic properties (M_S = 51 emu g⁻¹, M_r = 5.4 emu g⁻¹, and H_C = 71 Oe) and, therefore, can be easily recovered with an external magnet and reused for at least 11 runs without significant degradation in the catalytic activity.

采用化学共沉淀法合成了聚乙烯吡咯烷酮改性的磁赤铁矿纳米粒子。钯离子已被再固定在PVP /γ-的Fe ₂ ö ₃磁性支撑。将Pd-PVP /γ-的Fe ₂ ö ₃使用X射线衍射所得的催化剂的特征在于，热重加上差示扫描量热法和四极杆质谱，扫描电子显微镜能量分散型X射线分析，透射电子显微镜，氮吸附组合-解吸和振动样品的磁力。形态，微结构，颗粒大小和Pd的PVP /的纹理特性γ-的Fe ₂ ö ₃用那些未改性的Pd /γ-的Fe相比₂ ö ₃催化剂，使用相同的方法合成。聚合物已经影响γ-Fe的大小_2个ö ₃纳米颗粒和它们的附聚，形成具有降低的介孔（4.5纳米）紧凑的微观结构。具有3-5纳米尺寸的纳米颗粒的钯被发现两者PVP /γ-Fe的表面上₂ ö ₃颗粒（6-10纳米）和内孔由它们形成。将Pd-PVP /γ-的Fe ₂ ö ₃已经证明在苯乙炔氢化改进的催化性能40℃和0.1MPa下的温和的条件下，相对于钯/γ-的Fe ₂ ö ₃以及使用聚乙二醇和果胶制备的类似催化剂。C-C三键的对Pd-PVP /γ-铁的氢化率₂ ö ₃达到2.8×10 ^-6 摩尔小号^-1和苯乙烯选择性为92％。催化剂显示出弱的铁磁和软磁性能（M _S  = 51 emu g ^-1，M _r  = 5.4 emu g ^-1，H _C  = 71 Oe），因此可以很容易地用外部磁体回收并重新用于至少进行11次，催化活性没有明显降低。