Catalysts for VOCs combustion have been widely studied and zeolite-based materials and have been structured to meet the need of particle use in this field. This review summarized several new trends in zeolite-based catalysts for VOCs catalytic oxidation. Intensive effort has been devoted to the optimization of composition and structure of catalysts, abatement of CVOCs, design of zeolite-based monolithic catalysts and adsorbent/catalyst bi-functional material. The suggestions for further work here presented are put forward based on the collation of recently published papers.

In this work, a novel method for the preparation of high-entropy oxides (HEO) was successfully developed using multivariate composition layered double hydroxides (LDHs) as precursor. Thermal treatment over 600 °C led to the complete transformation of LDHs to single spinel phase HEOs. The performance of the obtained HEO catalysts in the removal of volatile organic compounds (VOCs) was studied with the catalytic oxidation of toluene as the probe reaction. The optimized HEO-600 catalyst showed impressive activity and stability over toluene catalytic oxidation, which resulted from the vast quantity of surface oxygen vacancies and the relative variable metal valence. The T₅₀ and T₉₀ values of HEO-600 were 246 and 254 °C, and the T₉₀ value only presented a slight increase to 265 °C after a 10-cycle test. This work developed a simple way to obtain HEO materials and provide technical support for the application of HEO catalysts for VOCs removal.

The dynamic adsorption characteristics of K₂CO₃-promoted layered double hydroxides (LDHs)-based adsorbent, with organic and inorganic anion intercalation, were studied. MgAl–LDH, K₂CO₃/MgAl–LDH, and K₂CO₃/MgAl–LDH(C16) with varying K₂CO₃ loads were prepared and used for intermediate-temperature CO₂ sequestration. The adsorbent was thoroughly characterized using X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy, and Fourier Transform Infrared Spectroscopy techniques, which revealed enhanced adsorption properties of MgAl–LDH, due to K₂CO₃ promotion. Thermogravimetric CO₂ adsorption tests on the constructed adsorbent materials showed that the 12.5 wt% K₂CO₃/MgAl–LDH(C16) adsorbent with organic anion intercalation exhibited optimal adsorption activity, achieving an adsorption capacity of 1.12 mmol/g at 100% CO₂ and 350 °C. However, fixed-bed dynamic adsorption tests yielded different results; the 25 wt% K₂CO₃/MgAl–LDH prepared through inorganic anion intercalation exhibited the best adsorption performance in low-concentration CO₂ penetration tests. The recorded penetration time was 93.1 s, accompanied by an adsorption capacity of 0.722 mmol/g. This can be attributed to the faster adsorption kinetics exhibited by the 25 wt% K₂CO₃/MgAl–LDH adsorbent during the early stages of adsorption, thereby facilitating efficient CO₂ capture in low-concentration CO₂ streams. This is a conclusion that differs from previous reports. Earlier reports indicated that LDHs with organic anion intercalation exhibited higher CO₂ adsorption activity in thermogravimetric analyzer tests. However, this study found that for the fixed-bed dynamic adsorption process, K₂CO₃-modified inorganic anion-intercalated LDHs perform better, indicating their greater potential in practical applications.

In this paper, the removal effects and activation energy of Ce and Pd doping on pollutants (CO, C₃H₆, and NO) were comparatively analyzed by using characterization methods and constructed kinetic equations. Furthermore, the problems of the water influence mechanism on the NSR process were also discussed. The results show the following: (1) Pd doping effectively improves the removal of CO (80%) and C₃H₆ (71%) in the low-temperature section of the catalyst (150–250 °C) compared to Ce doping, while Ce doping exhibits excellent low-temperature conversion of NO. (2) The reaction activation energy of the LaKMnPdO₃ catalyst was 9784 kJ/mol, which was significantly lower than that of the LaKMnCeO₃ catalyst. (3) The presence of H₂O has an important enhancement effect in the storage performance of the LaKMnPdO₃ catalyst for NOx but decreases the catalytic reduction of NO. It provides a solution for the effective treatment of the increasing problems of particulate matter and ozone pollution.