喷雾干燥法制备偏钨酸铵微球时的形貌与粒度Morphology and Size of Ammonium Metatungstate Microsphere Prepared by Spray Drying Method
盛江峰,马淳安,张诚,李国华,张维民
摘要(Abstract):
偏钨酸铵(AMT)是碳化钨(WC)催化剂的前驱体之一,WC颗粒的表面形貌和粒径分布受其前驱体性质的影响,并最终影响其催化活性。今介绍了气流式和离心式两种喷雾干燥法的工作原理,通过两种不同喷雾方式成功制备了不同形貌的AMT微球,并研究了微球的形貌和粒度。结果表明,粉末经离心式喷雾干燥处理后为实心球状,经气流式喷雾干燥处理则为空心球状。在气流式喷雾干燥条件下,探讨了料液浓度、进料速度和表面活性剂对AMT微球粒度的影响。研究表明,料液浓度因素对微球粒径影响最大;在不同干燥条件下,所制备的球形粉体的最小中位径(d50)为2.26μm。以上结果为喷雾微球化-气固反应制备介孔结构空心球状WC催化剂及其形貌和粒度的控制提供了参考依据。
关键词(KeyWords): 喷雾干燥;形貌;粒度;微球;偏钨酸铵
基金项目(Foundation): 国家自然科学基金(20476097);; 浙江省自然科学重大基金(ZD0024)
作者(Author): 盛江峰,马淳安,张诚,李国华,张维民
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