Polyacrylamide microspheres were soft, flexible, deformable, thermostability and halotolerant micro-gel particles that could be used as deep profile control agent in oil fields with the ultimate purpose of improving oil recovery. In this study, a series of terpolymeric microspheres were prepared through inverse suspension polymerization using the monomers of acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and 1-vinyl-2-pyrrolidinone (NVP). By orthogonal experiments, the formulation optimized can be selected. The shape and size were investigated by electron microscope (EMS), scanning electron microscope (SEM) and light diffraction particle size analyzer and the thermal stability was examined by high-temperature water solution. The experimental results showed that the terpolymeric microspheres has good monodispersity. Under suitable reaction conditions, the particle size and swelling properties of microspheres were influenced significantly by the monomer ratio.
Automobile exhaust emissions are the main source of pollution at present, and Three-Way catalytic converter (TWC), as the main mean of automobile exhaust purification, can effectively control the negative impact posed by automobile exhaust. However, there are still some problems that can be improved in the current TWC, such as catalyst sintering and low temperature catalytic efficiency. As an advanced catalytic field, it has a good effect on CO governance in TWC. This paper mainly studies how single-atom catalysis catalyzes CO in TWC based on related literature researches and analyzes the mechanisms and experimental data from other teams. The preparation method of SAC will also be introduced. It is concluded that SAC has a good effect on CO catalysis in TWC, and it can also improve the existing problems in TWC. Different supports also have different mechanisms for CO oxidation. In the future, if SAC can be applied in TWC, all aspects will be significantly improved.
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