Alx/HKUST-1 prepared by synthetic exchange as catalyst for reduction of NO by CO at low temperature
(1. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
3. State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China;
4. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Ministry of Education), Anhui University of Technology, Ma’anshan 243002, China)
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
3. State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China;
4. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Ministry of Education), Anhui University of Technology, Ma’anshan 243002, China)
Abstract: Alx/HKUST-1(x=1/24, 1/12, 1/6, 1/3), one of the bimetallic copper-based organic framework materials, was successfully prepared by the synthetic exchange method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), specific surface area (BET), thermogravimetric analysis (TG), infrared spectra (IR), X-ray photoelectron spectroscopy (XPS), and H2-temperature programmed reduction (H2-TPR). The findings indicated that Alx/HKUST-1 maintained the octahedral morphology of its precursor (HKUST-1). The thermal stability and catalytic reduction ability of HKUST-1 skeleton were improved by doping aluminum (Al3+). Al1/12/HKUST-1 showed the best performance among all samples, with a nitric oxide (NO) conversion rate of 100% at 210 °C (50 °C lower than that of HKUST-1). The valence kind of Al, Cu, and O in Al1/12/HKUST-1 did not change after the catalytic reaction, but the contents of Al, Cu, and O in different forms changed significantly. The catalytic process of the Alx/HKUST-1 followed a Langmuir-Hinshelwood mechanism.
Key words: copper-based organic framework; aluminium doping; synthetic exchange; denitration at low temperature; carbon monoxide