Direct conversion of syngas into aromatics over a bifunctional catalyst: inhibiting net CO₂ release

Abstract

Co-feeding of CO2 did not affect syngas conversion to aromatics but significantly suppressed CO2 formation over bifunctional ZnO–ZrO2/H-ZSM-5 catalyst.

Tuning the Rh–FeOx Interface in Ethanol Synthesis through Formation Phase Studies at High Pressures of Synthesis Gas

“…However, CO 2 selectivities of up to 34.5% have been measured, which are most likely caused by the water gas shift (WGS) reaction. , The WGS reaction is a common side-reaction in syngas conversion . Thus, a competitive formation of CO 2 could be probably suppressed through an optimization of the reaction conditions (e.g., cofeeding of CO 2 ). , Considering CO 2 as a side-product, the overall alcohol selectivity could be significantly increased from 30.9 to 59.8% on a CO 2 -free basis (Table S3, entries 11 and 15).…”

Aromatics Production via Methanol-Mediated Transformation Routes

“…A recent report from the same group pointed out this problem can be partially solved by co-feeding CO 2 in the syngas mixture to drive the thermodynamic equilibrium to the reverse water−gas shift (RWGS) reaction direction without significant effect on the formation of aromatics. 344 In fact, if we compare the aromatic selectivity in the above STA process (80%) with the selectivities that have been reported in methanol conversion using H-ZSM-5 as the catalyst, the values in the later cases are much lower (<40%). Even when Zn-or Ga-modifed ZSM-5 catalysts are employed, the selectivity of aromatics is generally still lower than 80%.…”

“…Note that the formation of abundant CO 2 by water–gas shift (WGS) reaction was unavoidable in the above system, which definitely decreased the carbon efficiency. A recent report from the same group pointed out this problem can be partially solved by co-feeding CO 2 in the syngas mixture to drive the thermodynamic equilibrium to the reverse water–gas shift (RWGS) reaction direction without significant effect on the formation of aromatics …”

Boosting the synthesis of value-added aromatics directly from syngas via a Cr2O3 and Ga doped zeolite capsule catalyst

“…1c and Table S4 †). [13][14][15][25][26][27][28][29] The following work will focus on discovering the mechanism of the enhanced aromatics yield by Ga doping, which is signicant to guide the rational design of efficient catalysts for oriented conversion of syngas to value-added aromatics.…”

“…To overcome these shortcomings, Wang et al co-fed CO 2 to suppress the formation of net CO 2 by shiing the equilibrium of the WGS reaction that occurred during the tandem process. 15 More attention has also been paid to the rational design of a metal oxide catalyst to boost the aromatics synthesis performance by increasing the methanol synthesis activity of the bifunctional catalyst. 16,17 A closer look at the tandem reaction network reveals that the physicochemical properties of the zeolite component in the bifunctional catalyst also play a vital role in determining the aromatics synthesis performance, but they have been rarely studied.…”