Mesoporous Zeolite Single Crystals

Preparation of Mesoporous Fe2O3-Supported ZSM-5 Zeolites by Carbon-Templating and their Evaluation as Photo-Fenton Catalysts to Degrade Organic Pollutant

“…In addition, all the ZSM-5 samples maintained high values of the BET area, total porous volume and mesopores volume after the impregnation with iron. The values of specific surface area (BET) and pore volume obtained in this work are similar to those ones published by others researchers 18,21,34 , using carbon nanoparticles as mesopores template for the ZSM-5 synthesis. Figure 7 shows SEM images of samples ZP-Fe (Figure 7a), ZC4-Fe (Figure 7b), ZC5-Fe (Figure 7c) and the distribution of Fe 2 O 3 particles on the ZC5-Fe sample ( Figure 7d).…”

Multimodal Zr-Silicalite-1 zeolite nanocrystal aggregates with interconnected hierarchically micro-meso-macroporous architecture and enhanced mass transport property

“…However, one disadvantage of these zeolitic catalysts is that their pores (about 0.55 nm) are too small to be accessed by bulky reactants hindering their use in the fine chemical and petroleum processing industries [8,9]. Preparation of nanosized particles is a good option to obtain fast diffusion rate of reactants and high conversion of bulky molecules [10][11][12][13]. However, the reduction in crystal size of zeolites from the micrometer to the nanometer scale leads to the decrease in the crystalline degree, the thermal stability, and substantial changes in the properties.…”

“…There have been many successful approaches to hierarchical MFI-type zeolites [16]. The synthetic techniques involve (i) chemical and/or physical posttreatment, such as the steaming or acid leaching methods [17][18][19]; (ii) hard templating synthesis, such as carbon and colloid templating [20][21][22]; (iii) soft templating synthesis, such as the use of amphiphilic organosilanes [23,24]. However, for increased efficiency within industrial processes, hierarchically porous zeolitic catalysts displaying both micro-meso-macroporosity and strongly active sites are more desirable.…”

Well‐Organized Zeolite Nanocrystal Aggregates with Interconnected Hierarchically Micro–Meso–Macropore Systems Showing Enhanced Catalytic Performance

“…Recently, various successful attempts to synthesize mesoporous or macroporous zeolites with bimodal porosity and framework acidity have been reported. [4][5][6][7][8][9][10][11][12][13][14][15] These materials hold great promise, particularly in catalysis and separation processes in which optimization of the diffusion and confinement regimes is required. Whereas micro-and/or mesopores provide size and shape selectivity for the guest molecules, and thus enhance the host-guest interactions, the presence of macropores can considerably favor diffusion of the guest molecules and thus their access to the active sites.…”