制备高碳醇Cu-Fe系催化剂的比表面积、孔结构和孔径分布

Surface Area, Pore Structure and Pore Diameter Distribution of CuFe Catalysts for Preparation of High Alcohols

用ＡＳＡＰ－２０００型物理吸附仪，研究了制备高碳醇Ｃｕ－Ｆｅ系催化剂的比表面积、孔结构、孔容积和孔径分布等．结果表明，随着焙烧温度的提高，比表面积下降；在相同的焙烧温度下，组成和沉淀过程的ｐＨ值也影响其表面积大小．催化剂的活性与反应可利用的表面积相关．根据吸附－脱附等温线，确定了催化剂的孔结构及孔径分布的变化规律．数据表明，孔径分布和孔容积对催化剂的活性至关重要，平均孔径（４Ｖ／Ａ，根据ＢＥＴ）可作为衡量Ｃｕ－Ｆｅ系催化剂活性高低的一个参数．焙烧温度的选择是使催化剂具有适宜的孔径分布和较大的孔容积。

Surface area, pore structure, pore volume and pore diameter distribution of CuFe catalysts for preparation of high alcohols were studied by using a ASAP2000 Physical Adsorber. The results show that surface areas of the catalysts decrease with the increase of calcination temperatures and other preparation conditions, e.g. compostion and coprecipitation pH value also affect surface area. It was found that activity of the catalysts is only related to the utilizable surface area. According to the adsorptiondesorption isotherm plot of the catalysts, pore structure as well as its variation tendency were determined. Experimental data show that pore diameter distribution and pore volume are very important to the catalyst activity. The activities are proportional to the pore size of the catalysts. It can be drawn that choosing a proper calcination temperature is the key to got a suitable pore diameter distribution, a large pore volume, and a good activity for the catalysts.