Selective Conversion of CO₂ into para‐Xylene over a ZnCr₂O₄‐ZSM‐5 Catalyst

Abstract

An oxide‐zeolite (ZnCr2O4‐ZSM‐5) catalyst for directly converting CO2 to aromatics was designed and developed. It showed high PX/X (the C‐mol ratio of p‐xylene to all xylene) and PX/aromatics (the C‐mol ratio of p‐xylene to aromatics) ratios, which reached 97.3 and 63.9 %, respectively.

Role of Catalyst Domain Size in the Hydrogenation of CO2 to Aromatics over ZnZrOx/ZSM-5 Catalysts

“…Moreover, NH 3 -TPD results manifested that the density of strong acid sites of the H-form of ZSM-5-300 with different particle sizes is similar, within the range of 20−22 μmol g −1 (Figure 5G). The results of 27 Al MAS NMR are shown in Figure S6. Only a single peak at 57 ppm is observed.…”

“…The wafer was pretreated by heating at 723 K under vacuum for 2 h. The sample was then exposed to pyridine for adsorption at 423 K. It was then later heated to 523, 623, and 723 K with FT-IR readings taken in between at 423 K. Peaks at 1440 and 1540 cm −1 were used to track Lewis and Bronsted acid sites, respectively. 27 Al MAS NMR was obtained on Bruker Avance III (400 MHz). ∼0.1 g of powdered sample was packed in a 4 mm rotor, and measurements were done at a spinning rate of 12 kHz.…”

“…Despite much ongoing research on metal oxide catalyst improvements targeting methanol production performance, ,,,− many of the recent CO 2 aromatization studies simply utilize commercially available ZSM-5 materials without focusing on understanding and optimization of aromatization-contributing factors of the hybrid catalyst materials. ,,,,, While multiple research studies demonstrate the selective conversion to aromatics, , the required synergy between the hydrogenation catalyst and the zeolite catalyst in the CO 2 aromatization process limits operational conditions to a narrow range. Therefore, the physical and chemical properties of both catalysts need to be tailored for these specific reaction conditions.…”

CO2heterogeneous hydrogenation to carbon-based fuels: recent key developments and perspectives

“…25,26 In terms of zeolite, other strategies such as modifying acidity and constructing special spatial structures (for example, hollow or hierarchical zeolite) can also adjust the composition of different types of products in gasoline-range hydrocarbons. [167][168][169][170][171] Proximity regulation strategy. The above-mentioned composite catalysts for CO 2 hydrogenation contain catalytic sites, i.e., metal-based sites catalyzing CO 2 hydrogenation to olen or CH 3 OH intermediates, and acid sites of zeolite, catalyzing the subsequent transformation of intermediates to gasoline-range hydrocarbon.…”

“…25,26 In terms of zeolite, other strategies such as modifying acidity and constructing special spatial structures (for example, hollow or hierarchical zeolite) can also adjust the composition of different types of products in gasoline-range hydrocarbons. 167–171…”