Au/CeO2 was demonstrated to be a high efficiency catalyst for the conversion of 2-phenoxyacetophenol (PP-ol) employing O2 as an oxidant and methyl alcohol as the solvent without using an erosive strong base or acid.

As one of the most important high-tech nanomaterials, fumed silica has been widely used in many industrial fields due to its unique properties. However, particle size uniformity is still the technical barrier in this industry after years of development. Therefore, numerical simulations are employed to optimize the process parameters of a premixed multiring high-speed jet oxyhydrogen combustion reactor, and the result is applied to actual process units used in fumed silica production. By maintaining temperature consistency between inlet 2 and inlet 1 and increasing the gas flow rates of inlet 3 and inlet 4, the HCl flow and temperature field distribution in the reactor are improved significantly. The back mixing of HCl and the blocking of particles to the combustion reactor are suppressed. Compared to the original process, the median diameter (D50) of agglomerates particles and the 45 μm sieve residue content are decreased by 6.4 μm and 19.0 mg g–1, respectively. In addition, the tensile strength of high-temperature vulcanized rubber is increased by 1–1.5 MPa. The presented simulations provide technical support for quality improvements of fumed silica and a theoretical basis for the rational design of industrial combustion reactors.

The exploitation of condensation room-temperature vulcanized silicone rubber (C-RTV) with excellent mechanical properties and thermal stability is of great practical significance in the preparation of insulation materials and rubber products with high performance. In this work, novel silicone rubber was fabricated successfully by adding white carbon black (WCB) and different percentages of methyl MQ (MMQ) silicone resin to C-RTV silicone mold rubbers (C-RTV/WMMQ). The mechanical properties, dimensional thermal stabilities, and thermal decomposing temperatures of the as-prepared samples were investigated in detail. Compared to the primitive C-RTV, the tensile strength of the sample with the WCB adding an amount of 15% increased from 0.44 MPa to 3.9 MPa. When the 1% MMQ was introduced, the tensile strength further increased to 4.4 MPa, suggesting a 12.8% reinforcement rate in addition to the improvements in the dimensional thermal stabilities and decomposing temperature. Based on the experimental results, a feasible synergistic effect and compatibility mechanism was proposed that hydrogen bond formed on the interface between MMQ resin and C-RTV in addition to the rigid structure of WCB, and thus led to a dense crosslinking network structure in the polymer matrix.

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