钯炭催化剂催化氧化乙酸乙酯和甲苯的研究

Catalytic oxidation of ethyl acetate and toluene over palladium/activated carbon catalyst

以微孔球形活性炭为载体,通过浸渍法制备了钯炭催化剂(PP),研究了钯负载量、气体空速和进气浓度对甲苯和乙酸乙酯催化性能的影响。利用ICP、XRD、XPS等对催化剂进行表征。结果表明,PP催化剂的催化性能随钯负载量的增加逐渐提升,钯负载量为3.0%时所制PP催化剂在空速为12000 mL/(g·h)的条件下分别将乙酸乙酯和甲苯的T90降至276.8℃和198.1℃。同时,在模拟VOC催化氧化环境下运行168 h后,PP对乙酸乙酯和甲苯的T90分别升高了2.8℃和4.7℃,表明该催化剂具有良好的稳定性。

Microporous spherical activated carbons are used as supports for the preparation of Pd/activated carbon catalyst.The catalyst's catalytic performance for the oxidation of ethyl acetate and toluene under different palladium loading,space velocities,and concentrations is investigated.Characterization results by Inductively Coupled Plasma(ICP),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)demonstrate that Pd has been successfully loaded on the microporous spherical activated carbon.Experimental results show that the catalytic performance of the catalyst improves with the increase of palladium loading amount.At a space velocity of 12000 mL/(g·h),the T90 of ethyl acetate and toluene can be reduced to 276.8℃and 198.1℃,respectively by the catalyst with 3.0%of Pd loading amount.After the catalyst has been operated for 168 hours in a simulated VOCs oxidation environment,the T90 of ethyl acetate and toluene increases by to 2.8℃and 4.7℃,indicating a good stability.