AuPt alloy/SnNb₂O₆ ultrathin nanosheet (AuPt/SN) as a photocatalyst is constructed for selective hydrogenation of p-chloronitrobenzene (p-CNB) under visible light irradiation. A typical catalyst (Au_0.5Pt_0.5/SN) exhibits a high conversion of halonitrobenzenes (99.8%) and selectivity of haloaniline (99.1%). The results of in situ ATR-IR, XPS and Raman indicate a preferential chemoselective adsorption of –NO₂ that Lewis base sites (Sn²⁺) on the catalyst could selectively coordinate with –NO₂ whereas C-Cl bond is not be bonded, improving the catalytic selectivity. Atom Pt in alloy is responsible for the formation of ·H, while Au inhabits the dissociation of C-Cl via repressing the generation of Pt-H. The photogenerated electrons can accelerate the ·H formation. ·H could be transferred to Sn²⁺ sites for the hydrogenation of –NO₂ by hydrogen spillover. Therefore, the high performance of the catalyst can be attributed to a surface synergetic effect among Lewis base sites (Sn²⁺), AuPt alloy and photogenerated electrons.

构建了AuPt合金/SnNb ₂ O ₆超薄纳米片（AuPt/SN）作为光催化剂，用于在可见光照射下选择性加氢对氯硝基苯（p -CNB）。典型的催化剂（Au _0.5 Pt _0.5 /SN）表现出高的卤代硝基苯转化率（99.8%）和卤代苯胺的选择性（99.1%）。原位 ATR-IR、XPS 和拉曼的结果表明催化剂上的路易斯碱基 (Sn ^{2+ ) 可以选择性地与 -NO} ₂配位 -NO _{2的优先化学选择性吸附}而C-Cl键不键合，提高了催化选择性。合金中的原子Pt负责·H的形成，而Au通过抑制Pt-H的生成来抑制C-Cl的解离。光生电子可以加速·H的形成。·H可以通过氢溢出转移到Sn ²⁺位点用于​​-NO _2加氢。因此，催化剂的高性能可归因于路易斯碱基（Sn ²⁺）、AuPt合金和光生电子之间的表面协同效应。