Xuehui Huang

In this study, an environmentally friendly mesoporous material called COK-12 was created using inexpensive sodium silicate as a silica source and surfactant P123 as a soft template. COK-12 was then modified with p-xylene to produce a template called P-COK-12, which had a compact and well-ordered pore structure. For the first time, this modified mesoporous material was used as a template to prepare a mesoporous La_0.8Sr_0.2MnO₃ (LSM) catalyst through a combination of the nano-casting and sol-gel methods. The results showed that the LSM-550 catalyst, synthesized at 550 °C for 2 hours, had a large specific surface area of 72.11 m²/g and the highest molar ratio of surface Mn⁴⁺/Mn³⁺ and O_ads/O_lat. Additionally, the CO conversion results for different LSM-T samples (T=550, 600, 650, 700 °C) indicated that the LSM-550 sample exhibited the best catalytic activity, with T₅₀ of 180 °C and T₉₀ of 218 °C, as well as excellent stability.

Using Al₂O₃ and TiO₂ as raw materials, adding MgO as heat stabilizer and mullite as enhancer, aluminum titanate‐mullite multiphase ceramics were successfully prepared by solid phase synthesis. The effects of MgO and mullite were systematically studied on the phase composition, microstructure, thermal stability, sintering properties, and mechanical properties of aluminum titanate ceramics. The results showed that the introduction of Mg²⁺ can partially replace Al³⁺ to form Mg_xAl_2(1‐x)Ti_(1+x)O₅ solid solution, improved the thermal stability of aluminum titanate ceramics, and promoted the formation and growth of grains, which reduced the sintering temperature. The crack deflections caused by mullite particles improved the mechanical properties. The filling effect of mullite particles and the formation of silica in mullite raw materials were conducive to ceramic densification. The statistics of Mg4M10 sample were as follows: the porosity was only 2.9%, the flexural strength was as high as 64.15 MPa, and the thermal expansion coefficient was 1.35 × 10⁻⁶ K⁻¹ (RT‐700°C), encouraging the application of ceramics with high thermal mechanical properties.

In this study, spherical α-Fe₂O₃ prepared by the hydrothermal method was used as a template for the first time; LaFeO₃ perovskite catalysts were successfully synthesized by the molten salt method, sol–gel method, and co-precipitation method.

Aluminum titanate (Al₂TiO₅) was synthesized from Al₂O₃‐TiO₂ system by solid‐phase reaction with additives of light magnesium carbonate and SiO₂, incorporating with silicon carbide (SiC) particle. The influence of additives on the phase composition, microstructure configuration, sintering, and thermomechanical properties of the developed materials was investigated. The experimental results illustrated that the utilization of additives with applicable contents was conducive to the development of complex microstructures. The microstructures characterized by microcracks matrix together with interlocked grains were identified. The samples incorporating SiC and SiO₂ simultaneously displayed exceptional densification properties and microstructure as a result of a SiO₂ liquid phase accelerating SiC oxidation. Meanwhile, high flexural strength (41.51 MPa) and low thermal expansion coefficient of 0.485 × 10⁻⁶ K⁻¹ (RT‐1000 °C) were detected, encouraging refractory applications with high thermomechanical solicitations.

A molten salt method has been used to prepare porous La_0.8Sr_0.2Mn_1−xCu_xO₃(0 ≤x≤ 0.4) (LSMC-X) microspheres and La_0.8Sr_0.2MnO₃(LSM) nanocubes using spherical and cubic MnCO₃as templates, respectively.