Adsorption of nitrogen oxides by the moisture-saturated zeolites in gas stream

Novel Synthesis of a High-Performance Pt/ZnO/SiC Filter for the Oxidation of Toluene

“…Large amounts of volatile organic compounds (VOCs) and dust are discharged into the environment from industrial processes at chemical plants and power plants, and this air pollution has attracted increasing concern because of the potential threat to human health. Therefore, considerable efforts have been made to eliminate VOCs by adsorption, photocatalysis, condensation, biofiltration, and catalytic oxidation. , Of these methods, catalytic oxidation is recognized as a potentially efficient and economical technology for the removal of VOCs from industrial waste gas because this method avoids creating secondary pollution. Supported noble-metal catalysts such as Pt and Pd are widely used for the removal of VOCs.…”

Multifunctional NO-delivery vessel derived from aminopropyl-modified mesoporous zeolites

“…The first is the suitably high Si/Al ratio of zeolite, which not only suppresses the competitive adsorption of water but also has adequate electrostatic affinity toward nitrosamines [25]. A high Al content of zeolite usually couples with a large number of cations in the framework such as NaA, which is beneficial for adsorbing NO [5,38], but is improper for the acidtriggered release of NO because of the acid-induced structural decomposition in gastric juice [25]. On the contrary, a low Al content of zeolite goes against the adsorption of NO since cations such as Na + ions in the zeolites are favorable for NO storage under the experimental conditions [44].…”

“…Based on our previous investigation [25,26], the HZSM-5 zeolite with a Si/Al ratio of 20 is chosen, accompanied with mesoporous ZSM-5 zeolite and Al-containing and siliceous mesoporous MCM-41, in order to examine the influence of mesopores, zeolitic structure, and Al components in the composites on the release of NO in mimic gastric juice. As demonstrated in Table 2, HZSM-5 zeolite released more NO than MZ composite because of the promotion of cation in the zeolite on NO storage [5,38]. The MZ sample is the zeolitic material transformed from the as-synthesized mesoporous silica; hence it has less cation than HZSM-5 zeolite [35], resulting in a release performance inferior to zeolite HZSM-5.…”

“…The number of injections was fixed to 30 [38], and then the sample was purged by the N 2 flow for 1 h.…”

Investigation on the Removal of NO from SO2-Containing Simulated Flue Gas by an Ultraviolet/Fenton-Like Reaction

“…According to the status of the reaction process and reaction products, simultaneous removal technologies of SO 2 and NO x can be divided into two classes: dry and wet. , The dry technologies mainly include plasma removal, adsorption removal, photocatalytic oxidation, and ozonation oxidation. − The wet technologies mainly include chemical oxidation, complex absorption, and reduction absorption. − These technologies have shown good development and application prospects, but most of them are still in the laboratory stage because of existing technical or economic problems. , Therefore, continuing to develop new and efficient simultaneous removal technologies of NO x and SO 2 undoubtedly has important theoretical and practical significance.…”