In situ creation of multi-metallic species inside porous silicate materials with tunable catalytic properties

Abstract

Porous metal silicate (PMS) material PMS-11, consisting of uniformly distributed multi-metallic species inside the pores, is synthesized by using a discrete multi-metal coordination complex as the template, demonstrating high catalytic...

Stabilization of Ni0/NiII Heterojunctions inside Robust Porous Metal Silicate Materials for High-Performance Catalysis

“…Metal coordination complexes have also been used as precursors for in situ encapsulation of metal sites in zeolites; however, because the construction of zeolite frameworks needs additional organic directing agents, it is very difficult to control the formation of metal heterojunctions inside the pores . We have proposed a strategy to produce porous metal silicate (PMS) materials using metal–organic coordination molecules/fragments instead of traditional organic templates, which could in situ generate and encapsulate metal oxide and metal silicate species inside the pores. − In contrast to transition-metal oxides, metal silicates are very stable, which requires extreme reduction conditions at very high temperatures . Therefore, metal silicates could act as robust electron-deficient sites to stabilize the electron-rich metal sites, thus fabricating stable valence-mixed transition-metal heterojunctions inside porous PMS materials, which might highly boost the catalytic properties .…”

Generation of local redox potential from confined nano-bimetals in porous metal silicate materials for high-performance catalysis

“…[17][18][19][20][21][22] To realize stabilization of redox-active metal sites in porous materials, we developed a new class of porous metal silicate (PMS) materials by using metal-organic coordination complexes/fragments instead of traditional organic templates, demonstrating great potential to improve the stability and activity of immobilized metal sites inside the pores of PMS materials in catalysis. [23][24][25] It has been known that nickel metal exhibits high catalytic efficiency in hydrogenation of PAHs, while the product selectivity could not be effectively controlled. [26][27][28] In contrast, even though the catalytic efficiency of cobalt-based catalysts is relatively low, they often exhibited high product selectivity in hydrogenation reactions.…”

Pre-Coking Strategy Strengthening Stability Performance of Supported Nickel Catalysts in Chloronitrobenzene Hydrogenation

“…Halogenated anilines and their derivatives, such as chloroanilines and dichloroanilines, represent a class of important high-value intermediates for the synthesis of pharmaceutical ingredients, synthetic rubber, dyes, pesticides, etc. [1][2][3] Typical synthetic routes for these highly functionalized molecules are based on a two-step approach, i.e., the nitration of chlorobenzenes or dichlorobenzenes followed by the chemoselective hydrogenation of the nitro group. The hydrogenation process is traditionally realized by the use of stoichiometric reducing agents, including Fe, Zn, Sn, or hydride reagents [4], which unfortunately is environmentally unsustainable due to the generation of substantial amounts of harmful chemical wastes.…”