Neat dimethyl ether conversion to olefins (DTO) over HZSM-5: Effect of SiO2/Al2O3 on porosity, surface chemistry, and reactivity

Development of hierarchical EU-1 zeolite by sequential alkaline and acid treatments for selective dimethyl ether to propylene (DTP)

“…Based on the previous reported work on 3D zeolite (which already have good diffusivity for hydrocarbons), the amount of coke produced was directly proportional to the reaction temperature [35], which affected the zeolite life time. Therefore, using high temperature for 1D zeolites here will give worth results on deactivation.…”

Kinetic and Deactivation Differences Among Methanol, Dimethyl Ether and Chloromethane as Stock for Hydrocarbons

“…On the other hand, the chloromethane can be obtained in one step from natural gas by oxychlorination . Among the three individual and final routes (on zeolite or zeotype catalyst), that of methanol to hydrocarbons (MTH) has attracted the greater interest and has been scale‐up in China, while the other two routes (DME and chloromethane to hydrocarbons, DTH and CTH respectively) are under study …”

“…[10] Among the three individual and final routes (on zeolite or zeotype catalyst), that of methanol to hydrocarbons (MTH) has attracted the greater interest and has been scale-up in China, [11] while the other two routes (DME and chloromethane to hydrocarbons, DTH and CTH respectively) are under study. [12][13][14][15][16] An overview of the extensive literature on MTH, DTH and CTH reactions indicate that (i) the most studied catalysts are H-ZSM-5 zeolite and SAPO-34 zeotype, whereas (ii) the mechanisms of reaction are essentially similar. Normally, H-ZSM-5 zeolite catalyst is recognized by its high selectivity to C 5 + aliphatics or aromatics, relatively high selectivity of light olefins and extended lifetime, which can be extended even further with promoters.…”

Nature and Location of Carbonaceous Species in a Composite HZSM-5 Zeolite Catalyst during the Conversion of Dimethyl Ether into Light Olefins

“…The performance of high-silica HZSM-5 zeolite reaches a compromise between the light olefin selectivity, and an extended catalyst lifetime [14]. This behavior has been associated with its unique acid and textural properties [15][16][17][18]. In this sense, HZSM-5 zeolite displays acid sites of relatively weak strength nature and a three-dimensional porous network with two groups of interconnected channels: ellipsoidal 5.3 × 5.6 Å and sinusoidal 5.1 × 5.5 Å and without cages at intersections.…”