Hydrothermal synthesis of core-shell ZSM-5/SAPO-34 composite zeolites and catalytic performance in methanol-to-aromatics reaction

Influence of Hollow ZSM-5 Zeolites Prepared by Treatment with Different Alkalis on the Catalytic Conversion of Methanol to Aromatics

“…Catalytic performances of parent catalysts and hollow catalysts were investigated in a microreactor for MTA. In previous studies, we reported that ZSM-5 catalysts showed the highest BTX selectivity at 1.5 h –1 of WHSV . In this work, the effect of reaction temperatures (390, 420, 450, 480, and 510 °C) on the formation of aromatics was investigated at WHSV = 1.5 h –1 .…”

“…Lower selectivity of BTX at lower temperature might be resulted from insufficient conversion of methanol at this temperature. Methanol was mainly dehydrated at low temperature to form dimethyl ether (DME), and DME underwent catalytic conversion to mainly form C 4 olefins at this temperature, which resulted in lower BTX selectivity. , As the temperature was increased, an increasing selectivity of BTX via the consumption of C 2 –C 4 paraffins was observed, which may be attributed to the increased temperature promoting the reaction of hydrogen transfer. After the temperature exceeded 450 °C, the selectivity of BTX decreased, which was ascribed to the fact that the cracking of methanol to CH 4 , H 2 , and COx was an endothermic reaction, which further accelerated the formation of such byproducts with increasing the temperature .…”

“…In previous studies, we reported that ZSM-5 catalysts showed the highest BTX selectivity at 1.5 h −1 of WHSV. 34 In this work, the effect of reaction temperatures (390, 420, 450, 480, and 510 °C) on the formation of aromatics was investigated at WHSV = 1.5 h −1 . Figure 9 exhibits the BTX selectivity of all catalysts at different temperatures.…”

Selective Formation of Para-Xylene by Methanol Aromatization over Phosphorous Modified ZSM-5 Zeolites

“…However, it is imperative to develop new technologies because of the depletion of oil. The conversion of methanol to hydrocarbons over acidic zeolite catalysts is now considered an important and feasible non-petroleum route to obtain valuable chemicals [10][11][12][13][14][15][16][17][18]. Therefore, it is a significative work to design a shape selectivity catalyst for high PX selectivity in methanol to aromatics conversion (MTA).…”

Rapid hydrothermal synthesis of hierarchical ZSM-5/beta composite zeolites

“…4,5 The restricted mass transfer leads to the formation of carbon deposition, which further blocks the microporous channels of the zeolite. [6][7][8] To reduce the impact of the diffusion limitation, the research has been focused on the large-pore zeolites such as beta. 9 Zeolite beta is a BEA type zeolite with a three-dimensional structure of 12membered ring channels.…”