Pd₃P and PdP₂ phases of ca. 4 nm particle diameter were prepared on a TiO₂ support by an impregnation route. Data from the hydrogenation of acetylene under both non-competitive and competitive conditions showed that PdP₂/TiO₂ exhibits enhanced selectivity and stability relative to Pd₃P. Furthermore, the selectivity produced over PdP₂ (84% ethylene selectivity @ 100% acetylene conversion) compares favorably with recently reported materials. XPS and CO-IR measurements reveal that the incorporation of P helps to break up contiguous Pd sites. This in turn is thought to affect the adsorption and desorption of reactants/products and thus improves selectivity. This work reveals that the incorporation of P into Pd materials could be regarded as a promising approach to develop new and improved Pd-based catalyst by creating a means to control the nature of the active sites.

ca的Pd ₃ P和PdP ₂相。通过浸渍路线在TiO ₂载体上制备4nm的粒径。在非竞争性和竞争性条件下乙炔加氢的数据表明，相对于Pd ₃ P ，PdP ₂ / TiO ₂表现出增强的选择性和稳定性。此外，在PdP ₂之上产生的选择性（84％的乙烯选择性@ 100％的乙炔转化率）与最近报道的材料相比具有优势。XPS和CO-IR测量表明，P的掺入有助于破坏连续的Pd位点。进而认为这会影响反应物/产物的吸附和解吸，从而提高了选择性。这项工作表明，通过创建一种控制活性位点性质的方法，将P掺入Pd材料中可被视为开发新的和改进的Pd基催化剂的有前途的方法。