Mn‐doped CeO ₂ flower‐like microstructures have been synthesized by a facile method, involving the precipitation of metallic alkoxide precursor in a polyol process from the reaction of CeCl ₃ ·7H ₂ O with ethylene glycol in the presence of urea followed by calcination. By introducing manganese ions, the composition can be freely manipulated. To investigate whether there was a hybrid synergic effect in CH ₄ combustion reaction, further detailed characteristics of Mn‐doped CeO ₂ with various manganese contents were revealed by XRD, Raman, FT‐IR, SEM, EDS, XPS, OSC, H ₂ ‐TPR, and N ₂ adsorption‐desorption measurements. The doping manganese is demonstrated to increase the storage of oxygen vacancy for CH ₄ and enhance the redox capability, which can efficiently convert CH ₄ to CO ₂ and H ₂ O under oxygen‐rich condition. The excellent catalytic performance of MCO‐3 sample, which was obtained with the starting Mn/Ce ratios of 0.2 in the initial reactant compositions, is associated with the larger surface area and richer surface active oxygen species.

The reaction heat of CO₂ absorption by organic amines is directly related to the regenerative heat consumption of absorbers. Therefore, it is necessary to study and determine the heat of absorption reaction and heat of regeneration reaction of CO₂ capture solvent before its industrial validation and application. According to the law of thermodynamics, a computer model of the heat of absorption reaction and desorption reaction is established and verified. The heat of reaction of the AEP-DPA phase transition absorption system was studied under different ratios, absorption temperatures, reaction concentrations and reaction pressures. The heat of reaction increases with concentration and decreases with pressure. The reaction heat of the AEP-DPA phase transition absorption system and MEA were compared. The optimum reaction conditions were as follows: AEP-DPA ratio 6:4, absorption temperature 40 °C. The reduction rate of absorption heat and regenerative heat of the AEP-DPA phase change absorption system is more than 35% and 31%, respectively.

CeO₂–MO_x (M = Cu, Co, Ni) composite yolk–shell nanospheres with uniform size were fabricated by a general wet-chemical approach. It involved a non-equilibrium heat-treatment of Ce coordination polymer colloidal spheres (Ce-CPCSs) with a proper heating rate to produce CeO₂ yolk–shell nanospheres, followed by a solvothermal treatment of as-synthesized CeO₂ with M(CH₃COO)₂ in ethanol solution. During the solvothermal process, highly dispersed MO_x species were decorated on the surface of CeO₂ yolk–shell nanospheres to form CeO₂–MO_x composites. As a CO oxidation catalyst, the CeO₂–MO_x composite yolk–shell nanospheres showed strikingly higher catalytic activity than naked CeO₂ due to the strong synergistic interaction at the interface sites between MO_x and CeO₂. Cycling tests demonstrate the good cycle stability of these yolk–shell nanospheres. The initial concentration of M(CH₃COO)₂·xH₂O in the synthesis process played a significant role in catalytic performance for CO oxidation. Impressively, complete CO conversion as reached at a relatively low temperature of 145 °C over the CeO₂–CuO_x-2 sample. Furthermore, the CeO₂–CuO_x catalyst is more active than the CeO₂–CoO_x and CeO₂–NiO catalysts, indicating that the catalytic activity is correlates with the metal oxide. Additionally, this versatile synthesis approach can be expected to create other ceria-based composite oxide systems with various structures for a broad range of technical applications.

Activated carbon (AC) was modified by H₂SO₄ and used as a support for catalyst. The Fe₂S₃/AC-T catalyst was prepared by deposition-precipitation method and used to catalyze hydrocracking of coal-related model compound, di(1-naphthyl)methane (DNM). The properties of catalyst were studied by N₂ adsorption-desorption, X-ray diffraction, and scanning electron microscopy. The result showed that ferric sulfate and acidic centers had synergetic effect on hydrocracking of DNM when using Fe₂S₃/AC-T as catalyst, the optimal loading of Fe is 9 wt.%. Hydroconversion of the extraction residue from Guizhou bituminous coal was also studied using Fe₂S₃/AC-T as the catalyst. The reaction was conducted in cyclohexane under 0.8 Mpa of initial hydrogen pressure at 310°C. The reaction mixture was extracted with petroleum ether and analyzed by GC/MS. Amounts of organic compounds which fall into the categories of homologues of benzene and naphthalene were detected. It suggested that the catalyst could effectively catalyze the cleavage of C-C-bridged bonds.