摘要
采用沉淀法、共沉淀法、溶胶-凝胶法和改进的溶胶-凝胶法制备出TiO2-Al2O3复合载体,并用XRD、TEM、FT-IR等手段对其进行了表征。XRD结果表明,复合载体经550℃焙烧后,TiO2和Al2O3分别以锐钛矿和γ-Al2O3晶型存在,其中沉淀法和改进的溶胶-凝胶法制得载体的锐钛矿特征峰宽而尖锐;共沉淀法和溶胶-凝胶法制得的载体的锐钛矿特征峰表现不明显。TEM结果表明,TiO2为纳米粒子且均匀分布在Al2O3表面上,共沉淀法制备出的复合载体的粒子形貌表现为锐钛型TiO2粒子在γ-Al2O3上以单层或亚单层分散形式存在,而改进的溶胶-凝胶法制备出的复合载体中锐钛型TiO2和γ-Al2O3粒子形貌以更为清晰的橄榄状和絮状形式存在。FT-IR结果表明,4种方法制备出的复合载体酸性均主要表现为以L酸形式存在,仅含微量B酸。
The TiO2-Al203 support with large surface area was prepared by precipitationed, coprecipitationed, sol-gel and improved sol-gel methods, and characterize by XRD, TEM, FT-IR, and XRD. Tiatania and alumina in the combined support are in the forms of anatase and γ-Al2O3 crystal structure after calcined at 550℃, respectively, and anatase particles are uniformly dispersed on the support. The TEM showed that titania prepared by coprecipitationed method is nanometer grain on the surface of support, and anatase is uniformly dispersed.on the support and lies on γ-Al2O3 with monolayer or sub-monolayer, but anatase and γ-Al2O3 prepared by improved sol-gel method are in olive and garrulous shape. FT-IR result showed that, the acidity of samples of TA series represent mainly L acid modality, containing only a few B acid.
出处
《光谱实验室》
CAS
CSCD
2005年第4期778-781,共4页
Chinese Journal of Spectroscopy Laboratory
