TiO_2包覆Al_2O_3载体的制备及表征
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摘要
采用钛酸丁酯溶胶凝胶法制备一系列不同Ti/Al摩尔比的Al2O3-Ti O2复合载体,借助TG-DTG、XRD、FT-IR、SEM-EDS、BET等手段对载体进行表征.研究表明,钛酸丁酯的浓度直接影响壳层Ti O2的均匀性以及团聚情况.Ti/Al的合适摩尔比例为0.02~0.04,此时包覆层比较均匀.随着钛酸丁酯浓度的增加,Al2O3-Ti O2比表面积、孔容逐渐下降,可能由于加入低表面积的Ti O2,阻塞了Al2O3孔道.当p H范围为1~2,溶胶稳定透明,载体比表面积较大,约为199 m2·g-1.
A series of Al2O3-Ti O2 composite supporters with different mole ratio of Ti / Al were prepared by solgel method. And the samples were characterized by TG / DTG,XRD,FT-IR,SEM-EDS and BET in order to select the optimum synthetic conditions. The experimental results indicated that the uniformity and agglomeration of Ti O2 could be changed by the concentration Butyl Titanate when the Ti / Al = 0. 02,0. 04,Al2O3-Ti O2 had uniform coating layer. With increasing the concentrations of Butyl Titanate,the surface area and pore volume of Al2O3-Ti O2 decreased due to the additon of Ti O2 with low surface area. A stable transparent sol was synthesized when p H value was 1 to 2,and the specific surface area of the supporter was about 199 m2·g- 1.
A series of Al2O3-Ti O2 composite supporters with different mole ratio of Ti / Al were prepared by solgel method. And the samples were characterized by TG / DTG,XRD,FT-IR,SEM-EDS and BET in order to select the optimum synthetic conditions. The experimental results indicated that the uniformity and agglomeration of Ti O2 could be changed by the concentration Butyl Titanate when the Ti / Al = 0. 02,0. 04,Al2O3-Ti O2 had uniform coating layer. With increasing the concentrations of Butyl Titanate,the surface area and pore volume of Al2O3-Ti O2 decreased due to the additon of Ti O2 with low surface area. A stable transparent sol was synthesized when p H value was 1 to 2,and the specific surface area of the supporter was about 199 m2·g- 1.
引文
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[3]唐国旗,张春富,孙长山,等.活性氧化铝载体的研究进展[J].化工进展,2011,30(8):1756-1765.TANG G Q,ZHANG C F,SUN C S,et al.Research progress ofγ-alumina support[J].Chem Ind Engin Prog,2011,30(8):1756-1765.
[4]JIN R B,LIU Y,WANG Y,et al.The role of cerium in the improved SO2tolerance for NO reduction with NH3over MnCe/Ti O2catalyst at low temperature[J].Appl Catal B:Environ,2014,148/149:582-588.
[5]刘付胜聪,肖汉宁,李玉平,等.纳米Ti O2表面吸附聚乙二醇及其分散稳定性的研究[J].无机材料学报,2005,20(2):310-316.LIUFU S C,XIAO H N,LI Y P,et al.Plyethylene glycol adsorption behavior on nanoparticulate Ti O2and its stability in aqueous dispersions[J].J Inorg Mater,2005,20(2):310-316.
[6]施岩,崔国静,王海彦,等.纳米Ti O2/Al2O3复合载体的制备与表征[J].石油学报:石油加工,2005,21(6):12-18.SHI Y,CUI G J,WANG H Y,et al.Preparation and characterization of nano-Ti O2/Al2O3combined support[J].Acta Petrolei Sin:Petrol Proc Sec,2005,21(6):12-18.
[7]宋立民,李伟,张明慧,等.Ni2P/Si O2-Al2O3催化剂的制备、表征及其对4,6-二甲基二苯并噻吩加氢脱硫反应的催化性能[J].催化学报,2007,28(2):143-147.SONG L M,LI W,ZHANG M H,et al.Preparation and characterization of Ni2P/Si O2-Al2O3and its catalytic performance for hydrodesulfurization of 4,6-Dimethyldibenzothiophene[J].Chin J Catal,2007,28(2):143-147.
[8]AHMED M A,ABDEL-MESSIH M F.Structural and nano-composite features of Ti O2-Al2O3powders prepared by Sol-gel method[J].J Alloy Compd,2011,509(5):2154-2159.
[9]CUI B,PENG H X,XIA H Q,et al.Magnetically recoverable core-shell nanocomposites Fe2O3@Si O2@Ti O2-Ag with enhanced photocatalytic activity and antibacterial activity[J].Sep Purif Tech,2013,103:251-257.
[10]JAGTAP N,UMBARKAR S B,MIQUEL P,et al.Support modification to improve the sulphur tolerance of Ag/Al2O3for SCR of NOx with propene under lean-burn conditions[J].Appl Catal,2009,90(3/4):416-425.
[11]CHEN J,GUO Y,UESAWA N,et al.Promotional effect of titanium on the catalytic performance of anodic alumina supported silver catalyst for the selective reduction of NO with propene[J].J Chem Engin Jpn,2009,42(3):172-183.