运用 AES,XPS,XRD和 TEM等手段研究了 La Co O3模型催化剂 SO2 中毒过程表面化学状态、晶相结构及表面形貌的变化状况 ,初步推断了 La Co O3钙钛矿型复合金属氧化物催化剂的 SO2 中毒机理 .在 SO2强化中毒过程中 ,SO2 与催化剂的活性组...运用 AES,XPS,XRD和 TEM等手段研究了 La Co O3模型催化剂 SO2 中毒过程表面化学状态、晶相结构及表面形貌的变化状况 ,初步推断了 La Co O3钙钛矿型复合金属氧化物催化剂的 SO2 中毒机理 .在 SO2强化中毒过程中 ,SO2 与催化剂的活性组分 La Co O3反应生成硫酸镧和氧化亚钴 ,而在催化剂膜层内部则生成硫酸镧、亚硫酸镧及氧化亚钴 . SO2 对活性组分层的侵入及硫与 La Co O3活性组分的反应破坏了催化剂的钙钛矿结构 ,使得催化剂彻底中毒 .当中毒温度较低及中毒时间较短时 ,硫在膜层中呈峰形分布 ,其浓度随中毒温度及时间的增加而增加 .随中毒温度的升高及中毒时间的增长 ,由于亚硫酸盐的分解作用 ,S在活性层中的浓度反而降低 ,中毒深度则继续增加 .展开更多
Perovskite oxides LaCoO3 was prepared by the glycine-nitrate process,and a salt-assisted combustion process was presented.The characters of synthesized powders were analyzed by XRD,SEM and IR.The results show that the...Perovskite oxides LaCoO3 was prepared by the glycine-nitrate process,and a salt-assisted combustion process was presented.The characters of synthesized powders were analyzed by XRD,SEM and IR.The results show that the simple introduction of leachable inert inorganic salt NaCl as an excellent agglomeration inhibitor leaded to the formation of well-dispersed and fine crystalline particles.The photodegradation experiments of acid red B were carried out in the suspension of LaCoO3 acting as the photocatalysts.The degradation rate of acid red B was up to 94.0% from original 85.8% with 0.10g catalyst in 50mL,10mg/L acid red B degradation 2h.展开更多
文摘运用 AES,XPS,XRD和 TEM等手段研究了 La Co O3模型催化剂 SO2 中毒过程表面化学状态、晶相结构及表面形貌的变化状况 ,初步推断了 La Co O3钙钛矿型复合金属氧化物催化剂的 SO2 中毒机理 .在 SO2强化中毒过程中 ,SO2 与催化剂的活性组分 La Co O3反应生成硫酸镧和氧化亚钴 ,而在催化剂膜层内部则生成硫酸镧、亚硫酸镧及氧化亚钴 . SO2 对活性组分层的侵入及硫与 La Co O3活性组分的反应破坏了催化剂的钙钛矿结构 ,使得催化剂彻底中毒 .当中毒温度较低及中毒时间较短时 ,硫在膜层中呈峰形分布 ,其浓度随中毒温度及时间的增加而增加 .随中毒温度的升高及中毒时间的增长 ,由于亚硫酸盐的分解作用 ,S在活性层中的浓度反而降低 ,中毒深度则继续增加 .
文摘Perovskite oxides LaCoO3 was prepared by the glycine-nitrate process,and a salt-assisted combustion process was presented.The characters of synthesized powders were analyzed by XRD,SEM and IR.The results show that the simple introduction of leachable inert inorganic salt NaCl as an excellent agglomeration inhibitor leaded to the formation of well-dispersed and fine crystalline particles.The photodegradation experiments of acid red B were carried out in the suspension of LaCoO3 acting as the photocatalysts.The degradation rate of acid red B was up to 94.0% from original 85.8% with 0.10g catalyst in 50mL,10mg/L acid red B degradation 2h.
