淀粉改性SiO_2载体的预处理温度对其负载的铜基催化剂甲醇转化性能的影响  

Effect of calcination temperature of starch-modified silica on the performance of silica supported Cu catalyst in methanol conversion

作　　者：谷传涛[1,2] 李光俊[1,2] 胡蕴青[1] 庆绍军[1] 侯晓宁[1] 高志贤[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院研究生院,北京100049

出　　处：《燃料化学学报》2012年第11期1328-1335,共8页Journal of Fuel Chemistry and Technology

基　　金：煤转化国家重点实验室开放基金(11-12-308)

摘　　要：以淀粉为改性剂制备了淀粉改性的SiO2载体(SSi),经不同温度(T)焙烧处理后再负载活性铜组分(10%,质量分数),获得一系列铜基催化剂(Cu/SSi-T);采用TG、FT-IR、XRD、H2-TPR、SEM和氮气吸附等技术对载体和催化剂进行了表征,并考察了其对甲醇低温转化反应催化性能。结果显示,淀粉的存在可以减缓载体表面硅羟基的脱除速度;载体表面硅羟基有利于铜物种的分散,从而提高催化剂的活性。不同预处理温度能调变载体表面硅羟基浓度、比表面积和孔结构,并对催化剂上铜物种的晶粒大小及其催化性能有显著的影响。A series of starch-modified SiO2 （SSi-T） were obtained by calcining the extrudate of SiO2 and starch at different temperatures （T） and used as the support to prepare Cu catalysts （Cu/SSi-T, 10% ） by the impregnation method. The Cu catalysts were characterized by N2 sorption, FT-IR, TG, XRD, SEM and H2- TPR; their catalytic performance in methanol conversion was investigated in a fixed bed reactor. The results indicated that starch can reduce the removal rate of silanol groups （Si-OH） from the surface of the support during calcination and the surface silanol groups are beneficial to the dispersion of Cu species. The calcination temperature of starch-modified SiO2 exhibits a significant influence on the surface silanol （Si- OH ） concentration, the surface area and porous structure of the support; as a result, it may be used to adjust the size of supported CuO crystal grains and dispersion of Cu species, which determine the performance of the silica supported Cu catalysts in methanol conversion.

关 键 词：二氧化硅 淀粉改性 铜基催化剂 预处理温度 甲醇转化 甲酸甲酯 

分 类 号：O643.36[理学—物理化学]