Metal@Zeolite Hybrid Materials for Catalysis

Abstract

The fixation of metal nanoparticles into zeolite crystals has emerged as a new series of heterogeneous catalysts, giving performances that steadily outperform the generally supported catalysts in many important reactions. In this outlook, we define different noble metal-in-zeolite structures (metal@zeolite) according to the size of the nanoparticles and their relative location to the micropores. The metal species within the micropores and those larger than the micropores are denoted as encapsulated and fixed structures, respectively. The development in the strategies for the construction of metal@zeolite hybrid materials is briefly summarized in this work, where the rational preparation and improved thermal stability of the metal nanostructures are particularly mentioned. More importantly, these metal@zeolite hybrid materials as catalysts exhibit excellent shape selectivity. Finally, we review the current challenges and future perspectives for these metal@zeolite catalysts.

Thermodynamics of Molybdenum Trioxide (MoO3) Encapsulated in Zeolite Y

“…For the foreseeable future, carbon-based fuels, such as natural gas, petroleum, and biomass, will continue to be a significant part of our energy infrastructure, and interfacially engineered heterogeneous catalytic materials relying on transition metal (TM) species will continue to play a critical role in meeting our daily energy needs. [1][2][3][4] It has been demonstrated that once supported or confined, TMs, their oxide, carbide and nitrides particles exhibit promising performance with high activity and selectivity in selective conversion of methane, [5][6][7][8] low-temperature CO conversion, 9,10 selective hydrogenation/dehydrogenation, [11][12][13][14] bio-oil conversion and upgrading, [15][16][17][18] and water-gas shift reaction 19,20 . Existing literature on heterogeneous catalytic materials primarily emphasize their outstanding performance and complexity in kinetics and reaction mechanisms.…”

In situ encapsulated subnanometric CoO clusters within silicalite‐1 zeolite for efficient propane dehydrogenation

“…Unfortunately, the conventional impregnation cannot guarantee the metal precursor enter into the zeolite pores through subnanometric pore window, and a substantial of metal species will locate on the zeolite external surface, showing unsatisfied stability during PDH reaction. Recently, the encapsulation of metal species within zeolites (M@zeolite) by ligand‐assistance in situ crystallization strategy has been frequently reported, which exhibits various advantages for light hydrocarbon catalytic reactions 12–17 . For example, Gong and the colleagues reported the encapsulation of ultrasmall Pd clusters into sodalite zeolites 12 .…”

Thermodynamics of molybdenum trioxide encapsulated in zeolite Y

“…For the foreseeable future, carbon-based fuels, such as natural gas, petroleum, coal, and biomass, will continue to be a significant part of our energy infrastructure, and interfacially engineered heterogeneous catalytic materials relying on transition metal (TM) species will continue to play a critical role in meeting our daily energy needs. [1][2][3][4] It has been demonstrated that supported or confined TMs, their oxide (TMO), carbide (TMC), and nitride (TMN) particles exhibit promising performance with high activity and selectivity in selective conversion of methane, [5][6][7][8] low-temperature CO conversion, 9,10 selective hydrogenation/dehydrogenation, [11][12][13][14] bio-oil conversion and upgrading, [15][16][17][18] and water-gas shift reaction. 19,20 Existing literature on heterogeneous catalytic materials primarily emphasize their outstanding performance and complexity in kinetics and reaction mechanisms.…”