氧化铈在非贵金属氧化物催化剂中的作用（Ⅴ）—热环境对Cu—…

研究了热环境对Ｃｕ－Ｍｎ－Ｃｅ－Ｏ催化剂表面积、结构、氧性能及对甲苯催化氧化活性的影响。发现ＣｅＯ２作为助催化剂，对延缓氧化铝载体的表面收缩几乎没有作用，但能阻止催化剂中ＣｕＭｎ２Ｏ４尖晶石的生成，防止无定型活性相在高温环境中的烧结，提高催化剂水热稳定性能，尤其在温度高于８００℃时，效果尤佳，合适的Ｃｅ／Ｃｕ原子比为０．３８～０．４４。     

催化分光光度法测定油品及催化剂中的痕量钒

1 引言 张改兰、张振辉利用钒(V)在乙酸介质中于100℃下能催化溴酸钾氧化铬蓝黑R褪色,而建立了测定钒的最灵敏的催化分光光度法,其Sandell灵敏度为7.27×10~(-8)μg/cm~2。我们发现ng数量级的钒能在室温下催化上述反应,且共存物质的干扰限大幅度升高,提高了方法的选择性,简化了操作,能满足石油加工工业对分析钒的要求。本文考察了室温下催化反应的条件及12种离子的干扰情况,成功地将该法应用于石油产品及催化剂中痕量钒的测定。测定范围为0.3～6ng/25ml,检测限为0.3ng/25ml。用0.1g样品能检测到3.0ppb钒。     

Photocatalytic Synthesis of Oxygenates from Gaseous CO2 and CH4 over Semiconductor

Photoinduced synthesis of CO2 and CH4 was investigated using a batch reaction system on several photoactive materials supported on silicon dioxide. Single semiconductor showed higher selectivity to C1 compounds. The production of C2-C3 oxygenates took place preferentially on composite semiconductor photocatalysts. In particular, it was found that acetone was the primary product over Cu/CdS-TiO2/SiO2.