高岭土改性和层柱材料的制备与表征-工业催化专业论文.docxVIP

尺7驻人学坝卜|A文 尺7驻人学坝卜|A文 摘蛰 摘要 本论文研究煤系高岭土的酸处理改性和层柱化过程。首先应用酸碱洗涤、离 F交换等方法对煤系高岭土原土进行了预处理，对各利t酸处理的条件对性能如比 挺面积、堆密度和热稳定性的影响进行了分析，探讨了酸处理高岭土在水处理叶， IlJ应用。在此基础上重点研究了层柱高岭土的合成；酋先使用多种阳离了离子刈 高岭土极性层问域进行了离子交换，并使用醋酸钾等挟带剂插入高岭七层问；制 衙了聚锆离子溶液作为支柱化物质，进行层柱高岭土的合成研究；应用XRD、 TEM、IR、TG等分析手段测定了高岭士原土、预处理土、层柱高岭七的表面性 质和内部结构的改变。并研究了层柱高岭土对正庚烷裂化反应的催化效果。 ／ f酸处理可以破坏高岭土的层状结构，使其比表面积扩大，增强对重会属离子 的吸附性能，改善了环保应用中的水处理效果。离子交换对增加高岭土的阳离子 交换容量(CEC)有较大效果，增加了层柱高岭土合成过程rl，所需驱动力，使支柱 化离予易于进入高岭土层问。卤素离二于对高岭土层ful}k基具有破坏作用，使高岭 }：层问作用力减弱，易于后续步骤的进行。挟带剂有利于层柱士的合成，可以被 聚合羟基锆离子交换。层柱高岭土表现出大量网孔状结构，比表面积有较大的提 高。聚合羟基锆离子与高岭土层问的羟基发_i了作用，使层柱高岭土表面酸量增 加。层柱高岭土表面酸量的增加提供了更多盼活性中，h促进催化裂化反应的进 ＼／ 行，在催化性能评价中显示出相当活性。、7 j ＼ ／ 关键词：高岭土，改联层柱材料，催化裂化 ＼ 天i卜人学坝Ij论史 天i卜人学坝Ij论史 摘簦 ABSTRACT Acid treating and pillaring of coal—kaolinite were studied in this thesis．Acid alkali washing and ion exchanging，etc．，were used to deal with raw coal—kaolinite at first．The effects of treating conditions on the treating results such as BET specific surface area，stack density and thermal stability were investigated．At the base pillared kaolinite was studied emphatically．Several kinds of ion were used to the pre—treating of the region between the layers of kaolinite．Intercalating agent such as CH3COOK was used to the pre—treating Zr48+was prepared The synthesis of pillared kaolinite was investigated on the basis of pre—treated raw kaolinite The surface property and inside structure of all the kinds of samples were measured by XRD，TEM，IR，TG，etc And explored the use of samples in catalysis field by the action of heptane cracking Acid treating destroyed the layered structure of kaolinite and amplified the BET specific surface area．The adsorption property to heavy metal ions is enhanced in w