Abstract
To achieve a selective catalytic reduction of nitrogen oxide (NOx) in a wide temperature range and avoid the secondary pollution of commercial catalysts, a new type of highly active catalyst Cu@ZIF-7 was synthesized. X-ray diffraction, x-ray photoelectron spectroscopy, and scanning electron microscopy were performed to analyze the morphological characteristics of Cu@ZIF-7. The effects of Cu load capacity, impregnation time, impregnation temperature, catalyst dosage, and reaction temperature on NOx removal efficiency were also investigated. Cu@ZIF-7 maintained a NOx removal efficiency of >90% in a temperature range of 250–400 °C. Finally, the stability, sulfur, and water resistance of Cu@ZIF-7 were investigated, and the NOx conversion mechanism was inferred through in situ diffuse reflectance infrared Fourier transform spectroscopy and references.
Highlights
Nitrogen oxide (NOx) emitted from the combustion of fossil fuels can harm human health, stimulate the respiratory system, and cause various environmental problems, such as regional haze, photochemical smog, and acid rain.1–4 Selective catalytic reduction (SCR) is a mature technology effective in controlling NOx emissions
To study the effects of catalyst synthesis conditions and reaction conditions of the Cu@zeolite imidazole ester framework (ZIF)-7 catalyst on NOx removal efficiency, experiments corresponding to various factors were conducted, and the catalyst synthesis conditions were optimized according to the experimental results
When SO2 and H2O were added simultaneously, the NOx removal efficiency initially decreased rapidly and slowly increased, exhibiting a recovery rate of 78.8%. This may be because compared with the active sites of the Cu@ZIF-7 catalyst, SO2 is preferentially combined with H2O, which reduces the damage to the catalyst structure and reduces the impact on the NOx removal efficiency of the catalyst
Summary
Nitrogen oxide (NOx) emitted from the combustion of fossil fuels can harm human health, stimulate the respiratory system, and cause various environmental problems, such as regional haze, photochemical smog, and acid rain. Selective catalytic reduction (SCR) is a mature technology effective in controlling NOx emissions. Jiang et al. constructed a low-temperature NH3–SCR reaction system in which the plasma-catalyst worked in concert with the catalyst under oxygen-rich conditions (14%) In this reaction system, Cu–Mn/SAPO-34 can achieve 80% NOx removal efficiency and 100% N2 selectivity at 180 ○C under a specific energy input of 32 J/l. The zeolite imidazole ester framework (ZIF) material has a highly ordered porous structure It is a type of metal–organic framework (MOF) material rich in N elements and is widely used in the preparation of catalyst precursors.. Different from traditional zeolite materials, the metal ions in the ZIF material replace the silicon and aluminum elements in zeolite and use imidazole as the framework to form a zeolite-like structural material. Different from traditional zeolite materials, the metal ions in ZIFs replace the silicon and aluminum elements in zeolite and use imidazole as the framework to form a zeolite-like structure material. After the sample cooled and reached room temperature, it was marked as Cu@ZIF-7
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