摘要
以氧氯化锆(Zr OCl2·8H2O)为锆前驱体,乙酰丙酮(ACAC)作为水解抑制剂,十六烷基三甲基溴化铵(CTAB)为模板剂,用无水乙醇稀释的氨水调节溶液的p H,采用溶胶-凝胶法于溶剂无水乙醇中合成介孔氧化锆。在此基础上以草酸铌为铌前驱体,将铌元素掺杂到介孔氧化锆体系,制备介孔Nb2O5-Zr O2复合氧化物催化剂。采用低温氮气吸附-脱附、X射线粉末衍射(XRD)、Hammett指示剂法对样品进行表征。结果显示,将铌掺入介孔氧化锆后,可制备出介孔Nb2O5-Zr O2复合氧化物,当n(Nb)∶n(Zr)=0.05时,其产品BET表面积为122.42 m2/g,孔径为3.68 nm,与未掺杂介孔氧化锆的样品相比,虽然并没有产生新的酸位,但总酸量有所增加。
Mesoporous ZrO2 was synthesized in absolute ethyl alcohol solvent via a combined sol-gel process with cetyltrimethy- lammonium bromide（CTAB） as template,zirconyl chloride octahydrate （ZrOC12.8H20） as precursor,acetylacetone（ACAC） as hydrolysis inhibitor and with ammonia diluted by absolute ethyl alcohol to adjust the pH.Then,niobium was added to the meso- porous system to synthesize mesoporous Nb2Os-ZrO2,with niobium oxalate as precursor.The as-prepared composite oxide cata- lyst was characterized by XRD,nitrogen adsorption-desorption isotherms,and Hammett indicator method.Resuhs showed that when n （（Nb）：n （Zr）=0.05, the composite was of the typical mesoporous material, with BET specific surface area of 122.42 m2/g, and average pore diameter of 3.68 nm.Although the acid feature of mesoporous ZrO2 will be improved while doping Nb into mesoporous ZrO,it can＇t introduce new acid centers.
出处
《无机盐工业》
CAS
北大核心
2015年第2期75-78,共4页
Inorganic Chemicals Industry
基金
安徽省高等学校省级优秀青年人才基金重点项目(2013SQRL125ZD)
关键词
介孔氧化锆
铌掺杂
合成
酸性
mesoporous zirconia
niobium doping
synthesis
acidity
