Multimodal Zeolite‐Beta‐Based Catalysts with a Hierarchical, Three‐level Pore Structure

Abstract

Hole diggers: The hierarchically structured porous solid‐acid catalyst described in this report possess a remarkable pore system, encompassing well‐defined macrochannels, interconnected mesopores, intracrystalline mesopores, and tunable zeolite micropores. Importantly, the catalyst exhibits very strong acidity and superior catalytic activity for esterification reactions.

B, N-codoped 3D micro-/mesoporous carbon nanofibers web as efficient metal-free catalysts for oxygen reduction

“…The isotherms are of type IV with the hysteresis in the desorption branch, showing the existence of mesopores in CNFs, BNC f -N and BNC f -NA. However, at low p/p 0 region (p/p 0 < 0.1), BNC f -NA have rapid adsorption increment, which may be due to the presence of micropores [43]. Table 2 gives the nitrogen adsorption data of CNFs, BNC f -N and BNC f -NA.…”

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

“…It could be successfully extended to the synthesis of micromeso-macroporous zeolite beta (MMMA C H T U N G T R E N N U N G (Beta), Figure 9 A-D) and zeolite TS-1 (MMMA C H T U N G T R E N N U N G (TS-1), Figure 9 E and F) [51,52] . SEM and XRD studies reveal that zeolite beta and zeolite TS-1 architectures with meso-macroporous structure are successfully synthesized in the glycerol system (Figure 9), similar to the case of hierarchically micro-meso-macroporous aluminosilicate with zeolite ZSM-5 architecture.…”

“…The zeolite beta sample (designated MMMA C H T U N G T R E N N U N G (Beta)) was synthesized in the glycerol system after mixing and drying the amorphous meso-macroporous aluminosilicate and precursor with a molar ratio of Al 2 O 3 /SiO 2 /TEAOH/H 2 O of 1.0:60:25:800 [51] , and micro-meso-macroporous TS-1 (designated MMMA C H T U N G T R E N N U N G (TS-1)) was synthesized in the glycerol system after mixing and drying the amorphous meso-macroporous titania silica and precursor with a molar ratio TiO 2 / SiO 2 /TPAOH/C 2 H 5 OH/H 2 O of 1.0:30:8:120:375. [52] X-ray diffraction patterns were obtained by using a Panalytical X'Pert diffractometer by using Cu Ka radiation (l = 1.54056 ). Scanning electron microscopy was performed on a JSM-7500F electron microscope (JEOL, Japan).…”

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

“…Preparation of hierarchically micro-meso-macroporous materials constructed from zeolite units including ZSM-5, Beta, and TS-1 nanocrystals, which presented high catalytic activities, have been described in our very recent works [25][26][27]. These catalysts exhibited single functionality.…”