About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Powder and Ceramic Materials Science
|
Presentation Title |
Selective Extraction of TiO<sub>2</sub> from Spent SCR Catalysts and Preparation of Fly Ash-based Photocatalysts |
Author(s) |
Xi Qian, Weihua Ao |
On-Site Speaker (Planned) |
Weihua Ao |
Abstract Scope |
V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> is a commonly used catalyst for selective catalytic reduction process (SCR), and the toxic elements content can be harmful to the environment when they are abandoned. To improve the economic efficiency of recycling, the spent SCR catalyst is crushed and cleaned, then dissolved using concentrated H<sub>2</sub>SO<sub>4</sub> to obtain the TiOSO<sub>4</sub> precursor. It was then loaded onto the fly ash surface by adding ammonia and then roasted to produce a composite photocatalyst. It was found that this method allowed the selective separation of TiO<sub>2</sub> from the spent SCR catalyst and the preparation of anatase TiO<sub>2</sub>. An excellent photocatalytic activity could be achieved according to a liquid-to-solid ratio of 7. At a TiO<sub>2</sub> loading around 20 wt%, a degradation about 97% rhodamine B by 60 min UV photocatalysis was achieved. The method can be applied to SCR catalyst retrieval and the produced composite photocatalyst has a wide application prospect. |
Proceedings Inclusion? |
Planned: |
Keywords |
Titanium, Nanotechnology, Sustainability |