稀土对磷钒催化剂性能的影响  

Effect of Rare Earth Elements on Characterization of V-P Catalyst

作　　者：李铭岫[1] 杨述韬[1] 刘翠格[1] 王心葵[1] 张志新[1] 周敬来[1] 

机构地区：[1]河北师范学院化学系,中国科学院山西煤炭化学研究所

出　　处：《中国稀土学报》1996年第1期11-15,共5页Journal of the Chinese Society of Rare Earths

基　　金：河北省自然科学基金

摘　　要：用Ｘ射线粉末衍射（ＸＲＤ）、Ｘ光电子能谱（ＸＰＳ）和氨－程序升温脱附（ＮＨ３－ＴＰＤ）等方法研究了添加稀土元素后用钒催化剂的晶相组成及表面性质。将催化剂应用于正丁烷选择氧化制备顺酐，用固定床反应器对催化剂活性进行评价。实验结果表明，磷钒催化剂添加稀土元素后可使正丁烷生成顺酐的产率提高４％～１５％。稀土助催化的作用原理是增加了催化剂表面的酸性。Phase composition and surface characterization of vanadium-phosphorus catalysts containing rare earth elemetns were investigated by means of X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), NH_3-temperature programmed desorption(NH_3-TPD) and so on. The catalysts were used for the selective oxidation of n-butane to maleic anhydride. Catalytic performance has been carried out in a fixed-bed reactor. Experimental results showed, yield of maleic anhydride is enhanced 4 ～ 15% over vanadium-phosphorus catalysts promoted with rare earth elements than over vanadium-phosphorus catalyst. The main action of promotor is that addition of rare carth elements may increase surface acidity of catalysts.

关 键 词：磷钒催化剂 稀土元素 助催化 表面性质 催化剂 

分 类 号：O643.36[理学—物理化学]