Preparation of Novel, Recyclable Catalysts by Ultrasonic Pre-treatment
摘要
The development of high-efficiency and eco-friendly catalysts is critical for achieving sustainable and green transformation in the chemical industry. Carbon-based solid acids, prepared with activated carbon as a carrier and sulfuric acid as the active component, exhibit advantages such as good catalytic performance, low cost, easy separation, and environmental friendliness. However, existing methods for preparing carbon-based sulfonic acid solid acid catalysts often suffer from stringent synthesis conditions and complex procedures. In this work, a novel, highly efficient, and recyclable micron-sized carbon-based solid acid was synthesized by using ultrasonic pretreatment method. The results demonstrated that the carbon-based solid acid prepared by ultrasonic pretreatment had an acid content as high as 1.19 mmol/g, a specific surface area of 178.56 m2/g, and an average particle size of 32.548 μm. The introduction of ultrasound improved the surface structure of the activated carbon, enlarged the pore volume and increased the specific surface area. The carbon-based solid acid prepared under ultrasonic treatment showed a 57.43% increase in acid content and a 44.51% increase in specific surface area compared to samples prepared under conventional conditions. This work provides a new method for synthesizing high-performance, recyclable non-homogeneous catalysts with large particle sizes.