Nickel silicate and NiAl-LDHs (layered double-hydroxides) have been controllably fabricated on the crystal surface of Si-rich and Al-rich USY zeolites, respectively, through a distinctive in-situ hydrothermal growth approach. This was realized by the host-guest chemistry that induced chemoselective interactions between adscititious Ni source and constituent species of zeolite framework. Upon hydrogen reduction, nickel silicate and NiAl-LDHs were transformed to highly dispersed Ni nanoparticles (NPs) immobilized in the SiO₂ and Al₂O₃ matrix, respectively, which were firmly anchored around the USY crystals. The controllable immobilization of Ni NPs created well preserved hierarchical porosity in USY zeolites. With highly dispersed metallic Ni active sites in Al₂O₃ matrix supported on USY zeolite, the [email protected] catalyst exhibited similar conversion but significantly enhanced selectivity in the reductive amination of 1-octanol to corresponding alkylamines in comparison to conventional Raney Ni catalyst.

通过独特的原位水热生长方法，分别在富硅和富铝USY沸石的晶体表面上可控地制备了硅酸镍和NiAl-LDHs（层状双氢氧化物）。这是通过主客体化学实现的，该化学诱导了吸附性镍源与沸石骨架组成物种之间的化学选择性相互作用。还原氢后，硅酸镍和NiAl-LDHs转变为固定在SiO ₂和Al ₂ O _3中的高度分散的Ni纳米颗粒（NPs）分别牢固地锚定在USY晶体周围的基质。Ni NPs的可控固定化在USY沸石中建立了良好保留的分级孔隙度。在USY沸石上负载的Al ₂ O ₃基质中高度分散的金属Ni活性位点上，与常规的阮内镍催化剂相比，[电子邮件保护的]催化剂表现出相似的转化率，但1-辛醇还原胺化为相应的烷基胺的选择性大大提高。