The change of atom density induced structural collapse in the transformation process from metal–organic frameworks (MOFs) to their inorganic counterparts is a major challenge to the achievement of porous hollow structures. Herein, we develop an amino acid-mediated strategy for transformation of NH₂-MIL-125(Ti) to successfully synthesize well-defined porous cages of titanium oxides (PCT) due to sheets serving as structural scaffolds. On this basis, PCT supported Pt-based nanoparticles are generated via a similar synthetic route, and are utilized to study the selective hydrogenation of carbonyl groups in α,β-unsaturated aldehydes, benefiting from the specific structures of PCT and tunable electronic structures of Pt mainly affected by doping with metal species such as Co. In this case, Pt–Co/PCT composites give 96% selectivity for cinnamyl alcohol at 100% conversion of cinnamaldehyde under 0.2 MPa H₂ and 80 °C for 3 h. This research would offer a promising strategy for important organic transformations in academic and industrial research to selectively synthesize high-value-added products.

中文翻译：

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NH2-MIL-125(Ti) 衍生的钛氧化物多孔笼支持 Pt-Co 合金进行化学选择性加氢反应†

在从金属-有机框架（MOF）到无机对应物的转变过程中，原子密度的变化导致结构坍塌是实现多孔空心结构的主要挑战。在此，我们开发了一种氨基酸介导的转化 NH ₂ -MIL-125(Ti) 的策略，以成功合成定义明确的钛氧化物 (PCT) 多孔笼，因为片材用作结构支架。在此基础上，PCT 支持的 Pt 基纳米粒子通过类似的合成路线，并用于研究 α,β-不饱和醛中羰基的选择性氢化，这得益于 PCT 的特定结构和主要受 Co 等金属物质掺杂影响的 Pt 的可调电子结构。在这种情况下，Pt-Co/PCT 复合材料在 0.2 MPa H ₂和 80 °C 下 3 小时，肉桂醛转化率为 100% 时，对肉桂醇的选择性为 96% 。这项研究将为学术和工业研究中的重要有机转变提供有前景的策略，以选择性地合成高附加值产品。