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采用正交试验方法对影响凹凸棒石预处理的因素酸洗时间、盐酸浓度以及酸土比进行探究,确定凹凸棒石的最佳改性方案为:盐酸浓度3mol/L,酸土比1∶5,酸洗时间6h。以盐酸改性后的凹凸棒石(PG)为载体,共沉淀法制备催化剂La_(0.8)Ce_(0.2)MnO_3/PG,考察了其对甲苯催化氧化的性能。同时对催化剂进行了X射线衍射、比表面积与孔结构分析、透射电镜表征。结果显示:盐酸改性后的PG比表面积显著增大,杂质减少,负载活性组分后催化性能优良,起燃温度为240℃,完全转化温度为310℃。
Orthogonal test method was used to study factors influencing the pretreatment of palygorskite, such as pickling time, hydrochloric acid concentration and acid-soil ratio. The best modification scheme of palygorskite was determined as hydrochloric acid concentration 3mol / L, acid-soil ratio 1: 5, pickling time 6h. The catalyst La_ (0.8) Ce 0.2 MnO_3 / PG was prepared by coprecipitation method using hydrochloric acid modified palygorskite (PG) as carrier, and its catalytic performance for toluene oxidation was investigated. The catalysts were characterized by X-ray diffraction, specific surface area and pore structure analysis and transmission electron microscopy. The results showed that the specific surface area of PG modified by hydrochloric acid was significantly increased, the impurities were reduced, and the catalytic activity was excellent after loading active components. The ignition temperature was 240 ℃ and the complete conversion temperature was 310 ℃.