Are hierarchical zeolites good catalysts for Methane Dehydroaromatization? A critical analysis

Efficient One‐pot Zeolite Synthesis Protocol from the Metastable *BEA to MTW Topology and Its Impact on the Methanol‐to‐Hydrocarbons Process

“…These new peaks were indicative of a gradual transformation from *BEA to MTW topology (Figure 2). [39,49,50] Interestingly, the intensity of peaks at 2θ=7.6° and 22.4°, present in both *BEA and MTW topologies, decreased initially during the process and then increased towards the end (Figure 2 and Figure S2), suggesting a dynamical quasi‐equilibrium between *BEA and MTW frameworks at the later stage. Since the IZC‐led transformation is usually driven by the common building units (CBUs) of zeolites involved, it might imply the impact of “mtw” CBUs in the current study (see detailed framework information in Figure 1).…”

“…This observation is consistent with the 27 Al NMR, where (at least) two tetrahedrally coordinated Al species were located at 53.8 ppm and 56.2 ppm, contributing to its broader nature (Figure S5). [46,58,59] Though the absorbed ammonia molecules could escape easily from the mesopores, [39] the desorption temperature remains almost the same over IZC-9, 13 in the low acidity region (i. e., 100-200 °C). This aspect could be related to the narrow spatial configuration of the MTW framework after zeolite conversion (Figure S7).…”

“…[36] Moreover, the crystal size could also be manipulated: micron-sized FAU zeolite could be transformed into a nano-sized CHA zeolite via the IZC process, enhancing adsorption capacity. [37] Rather than introducing a second OSDA [38,39] or alkaline/acid etching [40,41] or crystallization conditions [42] (e. g., hydrostatic pressure) for forming mesopores, the IZC process could easily lead to zeolites with hierarchical structure/nano-sized features simultaneously. [36] Typically, the IZC process starting from parent zeolites often delivers a shorter time and higher yields, that too avoiding the necessity of adding costly OSDAs, resulting in cost-effectiveness and unique properties.…”

Maximizing the catalytic performance of FER zeolite in the methanol-to-hydrocarbon process by manipulating the crystal size and constructing a bifunctional system

“…50,51 The glucose-assisted zeolite synthesis protocol typically facilitates mesopore formation and optimizes the morphology. 52,53 To achieve a fair comparison with the commercial FER zeolite (i.e., c-FER), obtaining a similar Si/Al ratio was attempted during the synthesis of our f-FER material. Herein, we refer to the supplementary section S1 in the ESI † for more synthetic and experimental details.…”

Investigation of the Properties of Mo/ZSM-5 Catalysts Based on Zeolites With Microporous and Micro-Mesoporous Structure

“…Obtaining catalysts based on zeolites with a micro-mesoporous structure is an urgent problem and opens new possibilities for their application [19,20]. In recent years, the attention of many research groups has been directed to the creation of zeolite-containing catalysts with an additional mesoporous structure [19,[21][22][23][24][25][26]. The synthesis of zeolite of the ZSM-5 type with an ordered hierarchical pore system is a promising direction for obtaining a catalyst with higher activity and stability in the methane dehydroaromatization reaction compared to microporous zeolite.…”