Influence of Aluminum Sources on Synthesis of SAPO-34 and NH3-SCR of NOx by as-Prepared Cu/SAPO-34 Catalysts

Tuan Doan; Anh Dang; Dat Nguyen; Khanh Dinh; Phong Dam; Thanh Huyen Vuong; Minh Thang Le; Pham Thanh Huyen

doi:10.18412/1816-0387-2020-5-373

Influence of Aluminum Sources on Synthesis of SAPO-34 and NH3-SCR of NOx by as-Prepared Cu/SAPO-34 Catalysts

Tuan Doan, Anh Dang, Dat Nguyen, Khanh Dinh, Phong Dam, Thanh Huyen Vuong, Minh Thang Le, Pham Thanh Huyen

https://doi.org/10.18412/1816-0387-2020-5-373

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Abstract

The full article will be published in the English version of the journal "Catalysis in Industry" No. 1, 2021.

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.