A solvent evaporation route towards fabrication of hierarchically porous ZSM-11 with highly accessible mesopores

Abstract

Abstract:A route to generate hierarchically porous zeolite ZSM-11 (MEL) has been paved via solvent evaporation induced self-assembly to produce a dry gel and its subsequent transformation into zeolite by steam-assisted-crystallization. The structure evolution has been monitored to shed light on the structure evolution during crystallization process.Measurements such as XRD, SEM, TEM, N 2 -physisorption, and TEM for inverse replica of

Uncalcined TS‐2 immobilized Au nanoparticles as a bifunctional catalyst to boost direct propylene epoxidation with H2 and O2

“…Additionally, the higher resolution image (Figure e) also reveals that the TS‐2‐B particles are composed of large numbers of small‐sized zeolite. The SAED pattern for TS‐2‐B (Figure g) shows that these small‐sized zeolites are orientated along the same crystalline axis, which is similar to the case of orientated nano‐zeolite aggregates obtained in the previous work . Moreover, as shown in Figure b,d, the TS‐1‐B exhibits a coffin‐like shape with smooth external surfaces, and Figure f,h exhibit that TS‐1‐B possesses well defined edges and a SAED pattern with bright spots, which evidences the single‐crystalline nature of TS‐1‐B .…”

“…The textural properties of the two uncalcined titanium silicates were further characterized by N 2 physisorption, and the results are shown in Figure i as well as Table S2. As obviously observed in Figure i, compared to the TS‐1‐B, the TS‐2‐B shows typical type IV isotherm with a H3 hysteresis loop, which is indicative of mesoporous characteristic, leading to a most probable pore size of ca. 12.5 nm.…”

Shaped binderless ZSM-11 zeolite catalyst prepared via a dry-gel conversion method: Characterization and application for alkylation of benzene with dimethyl ether

“…HZSM-11 showed morphology of irregular aggregates, composed of rod-like crystals, with particle size of 30 0-40 0 nm ( Fig. 3 a), which was in good accordance with other reports [28,29] . For sample HS ( Fig.…”

Unraveling the non-classic crystallization of SAPO-34 in a dry gel system towards controlling meso-structure with the assistance of growth inhibitor: Growth mechanism, hierarchical structure control and catalytic properties

“…Further growth of zeolites are mainly driven by the attachment of primary crystallites, and their fusion into larger crystals as a result of grain boundary elimination. OA growth has been recognized as a ubiquitous non-classic crystallization route, and the growth of zeolite beta [25,29,30], ZSM-11 [47], silicalite-1 (MFI) [48] and analcime (ANA) [49] have been found to obey this route under certain circumstances. Herein, we show that SAPO-34 crystallization in SAC system follow the OA route as an example for SAPO synthesis.…”