Ba_(1-x/2)K_xNiAl_(11)O_(19)催化剂的制备及其催化甲烷燃烧活性研究  

Synthesis of Ba_(1-x/2)K_xNiAl_(11)O_(19) Catalysts and Investigation on Their Catalytic Activity for Methane Combustion

作　　者：郑建东[1] 葛秀涛[1] 侯豹[1] 

机构地区：[1]滁州学院材料与化学工程学院,滁州239000

出　　处：《材料导报》2013年第8期36-39,共4页Materials Reports

基　　金：安徽省教育厅自然科学研究重点项目(KJ2012A213);安徽省教育厅教研项目(2012jyxm534);滁州学院校级重点教研项目(2011jyz007);滁州学院大学生科研项目(2012XS17)

摘　　要：采用异丙醇盐水解法制备Ba1-x/2KxNiAl11O19(x=0,0.5,1.0,1.5,2.0)催化剂。通过BET模型计算了其比表面积,用XRD和DSC-TG等技术及甲烷燃烧实验考察了催化剂的物理化学性能,研究了钾离子掺杂量对催化剂的结构以及对甲烷催化燃烧活性的影响。结果表明:催化剂在1200℃焙烧后可以形成完整的六铝酸盐晶型,同时具有较好的催化性能和高温稳定性,不同量的K和Ba离子掺杂对于催化剂的比表面积及孔径有较大的影响。Ba0.25K1.5NiAl11O19催化剂具有较大的比表面积和较高的活性,1200℃焙烧后比表面积为61m2/g,催化甲烷燃烧的完全转化温度T90%为750℃。A series of Ba-hexaaluminate catalysts Bal by hydrolysis of metal alkoxide method. The specific surface Ba1-x/2KxNiAl11O19 （x=0,0. 5,1.0,1.5,2.0）were prepared area of these catalysts was calculated using the BET too- del. The structure and the properties of them were investigated by using XRD, DSC-TG techniques. Their catalytic activities were evaluated for methane combustion. The results show that the catalyst with good crystal is obtained after calcination at 1200℃. The samples exhibit significant catalytic activity for methane combustion. The substitution of K and Ba has great effect on the properties of catalysts. Upon calcination at 1200℃ Ba0. 25 K1.5 NiAln O19 retains a spe- cific surface area of 61 m^2/g and shows an excellent activity for methane combustion （the conversion of 90% is ob- tained at 750 ℃ ）.

关 键 词：六铝酸盐 掺杂 甲烷催化燃烧 催化活性 

分 类 号：O643[理学—物理化学]