Abstract

The synthesis of the microporous SAPO-34 molecular sieve goes from a combination of three templates: triethylamine, tetraethylammonium hydroxide, and morpholine under hydrothermal conditions. Two aluminum sources, namely aluminum hydroxide, and aluminum isopropoxide, were used exclusively to synthesize SAPO-34 zeolites. The effects of aluminum sources on the crystallization and physicochemical properties of SAPO-34 were studied thoroughly. The synthesized samples were characterized by using different characterization methods, including XRD, FE-SEM, N₂ isotherm, EDS, and NH₃-TPD. The results illustrate that the various sources of aluminum used for the synthesis of SAPO-34 materials extremely affect the crystallinity, morphology, and density of acid sites. Besides, the influence of aluminum sources on the performance of NH₃-SCR technology was studied with Cu/SAPO-34 catalysts in a fixed-bed flow reactor. The two Cu/SAPO-34 catalysts promoted different NO and NH₃ conversions between 200–600°C though they share similar Cu content, which was loaded by the ion-exchange method in aqueous solution. In addition, the different Cu species in the two catalyst samples are surveyed by H₂-TPR, while the EPR method is also used to assess the coordination of the copper element in the two catalysts.

中文翻译：

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铝源对制备的Cu / SAPO-34催化剂合成SAPO-34和NO 3 NH 3 -SCR的影响

摘要

在水热条件下，微孔SAPO-34分子筛的合成来自三个模板的组合：三乙胺，氢氧化四乙铵和吗啉。两种铝源，即氢氧化铝和异丙醇铝，仅用于合成SAPO-34沸石。深入研究了铝源对SAPO-34结晶和理化性质的影响。通过不同的表征方法对合成的样品进行表征，包括XRD，FE-SEM，N ₂等温线，EDS和NH ₃-TPD。结果表明，用于合成SAPO-34材料的各种铝源极大地影响了酸位的结晶度，形态和密度。此外，在固定床流动反应器中研究了铝源对NH ₃ -SCR技术性能的影响。尽管两种Cu / SAPO-34催化剂具有相似的Cu含量，但通过离子交换法将其负载在水溶液中，这两种Cu / SAPO-34催化剂在200–600°C之间促进了不同的NO和NH ₃转化。另外，通过H ₂ -TPR调查了两种催化剂样品中不同的铜种类，而EPR方法也用于评估两种催化剂中铜元素的配位。