Precisely regulating Brønsted acid sites to promote the synthesis of light aromatics via CO2 hydrogenation

Thermocatalytic hydrogenation of CO2 into aromatics by tailor‐made catalysts: Recent advancements and perspectives

“…Multiple characterization techniques manifested that the suitable amount of Na, hierarchical pore structure, and appropriate density of Brønsted acid sites endowed the multifunctional catalyst with an outstanding aromatics yield and high catalytic stability. Sun et al investigated the effect of Brønsted acid sites on the light aromatics selectivity and coke formation in CTA via the modified FTS process very recently 55 . The results indicated that Brønsted acid sites of H‐ZSM‐5 are the main active sites for aromatization, and increasing Brønsted acidity significantly promotes the synthesis of aromatics, especially light aromatics.…”

“…Liu et al only increase the selectivity of para ‐xylene and meta ‐xylene in total hydrocarbons from 12.1% to 16.0% during the modified FTS process via the modified multifunctional catalyst Na‐Fe/H‐ZSM‐5@SiO 2 , which is far from that of the methanol‐mediated pathway 61 . Sun et al also passivated the external acid sites by depositing SiO 2 on the surface of H‐ZSM‐5 zeolite, the para ‐xylene selectivity in total hydrocarbons is still lower than 16.0% 55 . This phenomenon can be attributed to the different reaction mechanisms and networks between the modified FTS and methanol‐mediated routes for CTA.…”

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

“…The most commonly used supports are SiO 2 , Al 2 O 3 , TiO 2 , ZrO 2 , zeolites, and MOF ( Yang et al, 2017 ). A wide variety of zeolites such as ZSM-5, BEA, CHA ( Fujiwara et al, 2015 ; Dang et al, 2018 ; Wei et al, 2021 ) have been used to support metals in this reaction.…”

“…The well-known features of zeolites in organic synthesis, such as acidity and shape selectivity, are also very important for synthesizing aromatic compounds. Some studies have reported that the moderate distribution and stronger Brønsted acid sites (BAS) are good for synthesizing light aromatics, while a high density of BAS can cause major coke formation ( Wei et al, 2021 ).…”

“…Efforts are presently underway to mitigate CO 2 emissions into the environment, with the aim of protecting the environment and public health. During the 1990-2014 period, global greenhouse gas emissions increased from 33.8 to 48.9 billion tons, including a 52% increase in CO 2 emissions (Zhang J. et al, 2021). Although the greenhouse effect of CO 2 is 25 times less than that of methane (Yin et al, 2010), the former significantly predominates over the latter.…”