CAJ | 학술논문

研究了活性炭负载的金催化剂(Au/AC)对低浓度臭氧的催化分解性能,考察了前驱体溶液pH值、干燥方式、焙烧温度等制备条件对催化剂活性的影响,以及空速对臭氧分解率的影响.结果表明,在金前驱体溶液pH值为10、经微波辐射干燥、200 ℃氢气还原制备的催化剂,金颗粒在活性炭表面的分布更加均匀,尺寸更小,具有更高的催化活性.在室温、相对湿度45%和空速72 000 h~(-1)时,对浓度为50 mg/m~3臭氧的分解率保持在90%以上(在2400 min内).N_2吸附-脱附和XPS表征结果表明,活性炭载金催化剂在催化分解臭氧后,比表面积和孔体积略有下降;Au4f的XPS峰虽稍向高能方向移动,但仍保持催化活性;活性炭表面碳含量显著下降而氧含量大幅增加,说明活性炭上负载的Au在自身催化分解臭氧的同时,还起到了促进臭氧与单质碳反应的作用.
연구료활성탄부재적금최화제(Au/AC)대저농도취양적최화분해성능,고찰료전구체용액pH치、간조방식、배소온도등제비조건대최화제활성적영향,이급공속대취양분해솔적영향.결과표명,재금전구체용액pH치위10、경미파복사간조、200 ℃경기환원제비적최화제,금과립재활성탄표면적분포경가균균,척촌경소,구유경고적최화활성.재실온、상대습도45%화공속72 000 h~(-1)시,대농도위50 mg/m~3취양적분해솔보지재90%이상(재2400 min내).N_2흡부-탈부화XPS표정결과표명,활성탄재금최화제재최화분해취양후,비표면적화공체적략유하강;Au4f적XPS봉수초향고능방향이동,단잉보지최화활성;활성탄표면탄함량현저하강이양함량대폭증가,설명활성탄상부재적Au재자신최화분해취양적동시,환기도료촉진취양여단질탄반응적작용.
The activity of Au catalyst supported by activated carbon (Au/AC) for decomposition of low-level ozone was evaluated. The influence of preparation conditions such as pH value of precursor solution, drying mode and calcining temperature on the catalytic activity was studied, and the ozone removal ratio was tested under different space velocity at ambient temperature. The results show that the procedure of controlling the precursor pH=10, drying catalysts by microwave and being reduced at 200℃ with H2 can improve the dispersion of gold particle, decrease particle sizes and significantly enhance the activity of Au/AC for ozone decomposition. When the catalytic activity test was carried out under the condition of 50 mg/m~3 ozone in air, relative humidity 45%, space velocity 72 000 h~(-1) and ambient temperature, the ozone removal ratio could be maintained above 90% (within 2400 min). The results of N_2 adsorption-desorption and XPS show that, after the reaction with ozone the specific surface area and pore volume of Au/AC decrease slightly; Au/AC remains active although the spectrum peaks of Au4f shift toward higher. Furthermore, the fact that C content decreased notably while O increased, reveals that the Au supported on AC is concerned with the catalytic reaction and can concurrently promote another reaction between ozone and graphitic C.