Structural Effects of HZSM‐5 Zeolite on Methanol‐to‐Propylene Reaction

Abstract

ZSM‐5 zeolite was synthesized using n‐butylamine as a template under hydrothermal conditions. The morphology of the prepared zeolites was changed with the initial gel composition. The influences of OH−/template and H2O/template ratios on the morphology, mesoporosity, acid properties, and crystal size of the synthesized zeolites were evaluated, also the structural effects of the prepared zeolites on the catalytic performances of the methanol‐to‐propylene process. Increasing the external surface area and mesopore volume of the catalysts improved the propylene selectivity. A direct relationship between the deactivation of catalysts and their acidic properties was found. The results were derived from laboratory data and need to be re‐examined on a larger scale to ensure their accuracy on an industrial scale.

Effect of ZSM-5 zeolite porosity on catalytic cracking ofn-heptane

“…Table 1 shows that the mesopore volume of the samples is increased by increasing the reaction temperature and Na 2 O and SiO 2 in the initial gel, due to decreasing in the ZSM-5 particle size (TEM results). The hierarchical structure of the samples is evaluated by the hierarchical factor (HF) in Table 1, which is defined as: 9,50 ( V mic / V total ) × ( S Ext / S BET ) = HF…”

“…[3][4][5][6] A way to solve these problems is to construct the hierarchically porous zeolites with a supplementary meso or/and macroporous structure. [7][8][9][10][11] There are two different routes for the synthesis of the hierarchical zeolites; the top-down method through the reorganization of the lattice of the zeolite crystals and the bottom-up process via the formation of meso or macropores during the crystallization of the zeolites. 12,13 However, the latter method is the most favored in the ZSM-5 zeolite synthesis because of the high use of this type of zeolite in the chemical industry.…”

Dynamic Adsorption/Desorption of NOx on MFI Zeolites: Effects of Relative Humidity and Si/Al Ratio

“…Figure 2 shows the XRD patterns of the as-synthesized samples with the major diffraction peaks at 2θ of 7.9°, 8.7°, 23.1°, 23.9°, and 24.3°, implying the successful synthesis of the MFI framework topologies (JCPDS card No. 44-0003) [ 25 ]. The diffraction peaks of all MFI samples indicate that adjusting the Si/Al ratios has no effect on the zeolite framework.…”

Size controllable synthesis of ZSM-5 zeolite and its catalytic performance in the reaction of methanol conversion to aromatics

“…The reaction of methanol to hydrocarbons (MTHs) over a zeolite catalyst discovered in the 1970s is a non-petroleum route for the production of various hydrocarbons [9][10][11][12][13]. ZSM-5 zeolite is one of the most concerned materials in the MTH reaction.…”