Pd-SnO₂ heteroaggregate nanocatalysts were synthesized by in-situ transformation of PdSn bimetallic nanoparticles on alumina. The PdSn bimetallic nanoparticles were prepared by co-reduction of Pd and Sn precursors. The obtained PdSn nanoparticles possibly have a core-shell like structure with Pd cores and Sn-rich shells due to the fast reduction of Pd precursors. The Pd-SnO₂/Al₂O₃ heteroaggreagte nanocatalysts were synthesized by calcination of PdSn/Al₂O₃ in air followed by H₂ reduction. Various characterization techniques, such as HRTEM, XRD and XPS, were used to characterize the PdSn and Pd-SnO₂. The Pd₃-(SnO₂)₁/Al₂O₃ heteroaggreagte nanocatalysts with a ratio of Pd/Sn of 3/1 illustrated enhanced catalytic performances for p-nitroacetophenone and p-nitrobenzaldehyde hydrogenations relative to monometallic Pd nanocatalysts. Theoretical calculations using density functional theory suggested that Pd-SnO₂ facilitates the adsorption of reactants in a higher degree than that of products, thus enhancing the catalytic activity even with partial coverage of Pd surfaces with SnO₂. The blockage effect of SnO₂ on Pd surfaces is speculated to enhance the catalytic selectivity for p-nitroacetophenone and p-nitrobenzaldehyde hydrogenations over Pd-SnO₂ heteroaggregate nanocatalysts.

通过在氧化铝上原位转化PdSn双金属纳米粒子，合成了Pd-SnO ₂杂聚集体纳米催化剂。通过共还原Pd和Sn前体制备PdSn双金属纳米颗粒。由于Pd前体的快速还原，获得的PdSn纳米颗粒可能具有带有Pd核和富Sn壳的核-壳状结构。通过在空气中煅烧PdSn / Al ₂ O ₃，然后还原H ₂，合成了Pd-SnO ₂ / Al ₂ O ₃杂聚合纳米催化剂。各种表征技术（例如HRTEM，XRD和XPS）用于表征PdSn和Pd-SnO ₂。钯₃ - （SNO ₂）₁ / Al的₂ ö ₃ heteroaggreagte纳米催化剂用的3/1斑竹增强的催化性能的Pd / Sn构成的比p硝基乙酰苯和p相对于单金属的Pd纳米催化剂-nitrobenzaldehyde氢化。使用密度泛函理论的理论计算表明，Pd-SnO ₂的吸附程度高于产物，从而促进了反应物的吸附，因此即使SnO ₂部分覆盖了Pd表面，也提高了催化活性。推测SnO ₂对Pd表面的阻滞作用可增强对p的催化选择性。Pd-SnO ₂杂聚集体纳米催化剂上的对硝基苯乙酮和对硝基苯甲醛加氢反应。