【作者】 郭志强；

【导师】 葛忠华； 倪哲明；

【作者基本信息】 浙江工业大学 ， 工业催化， 2004， 硕士

【摘要】 对于具有层状结构的材料和性能研究是近年来的研究热点。水滑石是一种典型的层状阴离子粘土，其结构和水镁石（Mg（OH）₂）相似，水镁石中的Mg²⁺部分地被Al³⁺同晶取代而形成的衍生物称作水滑石。类水滑石化合物通式可表示为：[M_1-x^ⅡM_x^Ⅲ（OH）₂]^x+(A^n-)_x/n·mH₂O，由于M²⁺与M³⁺的比例在一定范围内可以调变，不仅可以维持其层状结构，而且可以调节它的酸碱性，甚至氧化还原性质。因此水滑石被众多的催化研究者所青睐。 本论文采用共沉淀法合成出了各类类水滑石样品，通过FT-IR，TG-DTA，XRD等表征手段，并在常温下对NOx的静态吸附进行了研究，以确定各类水滑石样品的制备条件，得到如下的研究结果。 合成了二元金属类水滑石化合物。经表征，样品具有典型的水滑石层状结构；作为前驱体对NO_x均具有良好的吸附性能，其中锌铝型类（Zn／Al摩尔比为3）水滑石对NO_x饱和吸附量最大，可达1851mg／g。 合成了铜钴铝等三元的不同摩尔投料比的碳酸根型水滑石，Cu／Co／Al摩尔之比分别为1：1：1～1：7：1，用XRD、IR、TG-DTA分析对它们进行了表征，测定了对氮氧化物的吸附性能。结果表明，Cu-Co-Al的摩尔之比在1：1：1～1：7：1时合成的化合物都具有水滑石结构，Co的含量增加，水滑石层间高度略有增加，热稳定性减弱热重-差热分析结果显示合成样品的分解均有两个过程。二元的Co₃Al-HTlc吸附NO_x优于三元的CuCoAl-HTlcs，三元的CuCo₃Al-HTlc对NO_x吸附性能优于其它三元的类水滑石化合物，二元的Co₃Al-HTlc和三元的CuCo₃Al-HTlc吸附容量分别为1781mg／g、1286mg／g。 采用离子交换法，将具有Keggin结构的磷钨酸、硅钨酸引入到Mg-Al、Mg-Al-Cu类水滑石（Hydrotalcite-like compounds，HTlcs）层间，成功制备了层有序度高，结晶度好的杂多酸阴离子柱撑类水滑石，得到了通道高度达1.15nm的大层间的催化材料，并用红外、XRD表征了材料的结构．测定了对NOx的吸附性能．更多还原

【Abstract】 The research on the structure and properties of laminated structure materials has become a hotspot recently. Hydrotalcite is a kind of negative ion clay with typical laminated structure. Its structure is similar with brucite Mg(0H)2, in which Mg2+ could be isomorphously replaced by Al3+ partly. The general formulas Hydrotalcite-like compounds are usually written as [MIIVxMIIIx(OH)2]x+ (An-)x/n mH2O. The ratio of M2+ and M3+ could be adjusted in wide range, which can not only maintain its laminated structure but also adjust its acidity and basicity, even oxidation-reduction nature. So hydrotalcites are widely used for numerous catalysis pursuers.This research work in this paper is mainly about that numerous hydrotalcite-like compounds were synthesized by co-precipitation. The samples were characterized by XRD, IR,TG-DTA; and the adsorption capacity of the samples after calcination at 500 ℃ for nitrogen oxides was measured. At last, optimal preparation condition is decided and some meaning conclusions are drawed.Diatomic metal hydrotalcite-like compounds were synthesized. The results show that the samples had typical layer hydrotalcite structure via characterization. The adsorption capacity of Zn3Al-HTlc for NOX was maximal, and the static saturation adsorption capacity was 1851mg/g.Carbonate pillared hydrotalcite-like compounds ( CuCoAl-HTlcs ) with different Cu/Co/Al molar ratios were synthesized by coprecipitation and characterized by XRD, IR, TG-DTA. The abilities of their adsorption on NOX were also measured. The results showed that the samples with Cu/Co/Al molar ratios of 1 : 1 : 1~1 : 7 : 1 have hydrotalcite structure and layer spacings increased with Co amount increase. The TG-DTA results showed that the materials decomposed in two stages and the thermal stability of the hydrotalcites decreased with increasing Co amount. The adsorption ability of the Co3Al-HTlc for NOX was much better than that of the CuCoAl-HTlcs,the adsorption ability of CuCO3Al-HTIC was better than the other the other CuCoAl-HTlcs. The adsorption capacities of the Co3Al-HTlc and CuCo3Al-HTlc were 1781mg/g and 1286mg/g respectively.The preparation of Mg-Al-hydrotalcite(WP-keggin, WSi-keggin) Mg-Al-Cu-hydrotalcite (WP-keggin, WSi-keggin) was studied. The POM-HTLs was synthesized using ion-exchange by introducing POM (heteropolyanions) into the layer of HTLcs. The POM-HTLcs was synthesized with high crystallization and high-order layers with the layered height of approximate 1.15nm successfully. The absorption ability of samples for NOx was also measured.更多还原