In this paper, a simple method was used to rapidly prepare MOF-808 with a large specific surface area and high stability. Bi₂S₃ and MOF-808 were used to design and synthesize high-stability Bi₂S₃/MOF-808 nanocomposites, which were then used for the photocatalytic degradation of antibiotic tetracyclines. The performance test results showed that the 0.7-808 composite material had good photocatalytic degradation performance for tetracycline under visible-light irradiation, and the degradation rate reached 80.8%, which was 3.21 times and 1.76 times that of MOF-808 and Bi₂S₃, respectively. This was mainly due to the high photocurrent response and photoluminescence of the Bi₂S₃/MOF-808 composite material. Therefore, the close contact of n–n Bi₂S₃/MOF-808 can transfer light-generated electrons and holes to improve the utilization efficiency of photogenerated charges, thereby greatly improving the photocatalytic reaction activity. Particle-capture experiments and ESR confirmed that ˙OH was the main active substance in the photocatalytic degradation.

La_1−xCa_xFe_1−xCo_xO₃ (x = 0.3, 0.5) perovskite-type oxide catalysts prepared by citric acid method were used for the steam reforming of ethanol (SRE) and oxidative steam reforming of ethanol (OSRE) to produce hydrogen. The anti-sintering and anti-coking properties of the catalysts for these two reactions have been investigated. The catalysts were characterized by temperature programmed reduction, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and thermal analysis techniques. The results indicated that the catalyst was highly selective to hydrogen, as well as very stable for OSRE reaction. The cobalt ions in the perovskite structure could be reduced to nanoparticles of metallic cobalt under the reduction atmosphere; the nano metallic cobalt could be oxidized and went back into the lattice of the perovskite structure under the oxidation atmosphere. The nanoparticles of metallic cobalt on the used catalyst could also be oxidized back into the perovskite structure. In the reaction process of OSRE, the cobalt species was possibly cycling as nanoparticles of metallic cobalt and cobalt ions in the perovskite structure, leading to its high anti-sintering stability.

An X-NiCu/EXVTM-SiO₂ (X = La, Ce, and Zr) catalyst was successfully prepared by using modified vermiculite as a support by the impregnation method. This experiment investigated the effects of La₂O₃, CeO₂, and ZrO₂ promoters on the activity of the NiCu/EXVTM-SiO₂ catalyst. The study found that the addition of three different metal oxides did not improve the activity of the NiCu/EXVTM-SiO₂ catalyst. On the contrary, some Ni active sites were covered by the promoter, which reduced the number of active sites, resulting in its catalytic activity lower than NiCu/EXVTM-SiO₂. In addition, the promoted catalysts that were repeatedly calcined two times can significantly reduce the textural property as well as active sites of the catalyst, resulting in the lower activity. However, in X-NiCu/EXVTM-SiO₂, Ce-NiCu/EXVTM-SiO₂ showed relatively high initial catalytic activity, with the initial conversion rate of CH₄ reaching 60.1% and the initial conversion rate of CO₂ reaching 89.1%. This is mainly because the catalyst has a stronger basic site on the surface to facilitate the adsorption of CO₂ molecules, and the smaller metal particle size is also conducive to the cleavage of C–H bonds.