低温选择性催化还原脱硝技术是国内烟气脱硝领域研究的一大热点，虽然低温SCR脱硝反应器大多布置于脱硫系统之后，但烟气中少量的SO2对催化剂依然有很强的毒害作用，已经严重阻碍了低温SCR技术的推广应用。目前，国内外尚未有解决低温催化剂抗硫中毒的有效方法，基于此，本申请提出构筑一种全新的石墨烯负载钛基核壳催化剂来提高催化剂的抗硫能力。低温催化剂的活性中心包裹于二氧化钛外壳之内，避免SO2与活性中心的直接作用，从而提高催化剂的抗硫能力，同时引入物理化学性能极为优越的新型材料石墨烯作为催化剂的载体，进一步降低硫酸铵盐在催化剂表面的沉积，从而解决低温SCR催化剂SO2中毒的问题。通过提出和完善催化剂的抗硫中毒作用机制，明确石墨烯核壳结构催化剂抗中毒能力的决定性因素，为催化剂抗中毒能力的进一步提升提供理论指导。本研究开发的催化剂具有优异的脱硝活性、稳定性、选择性和和抗SO2中毒的能力。

Low temperature selective catalytic reduction of NOx with NH3 is a promising method to remove NOx in flue gas. Although the low temperature SCR reactor is usually located downstream of the particulate control device, there is still a small amount of SO2 in flue gas. The drawbacks asscoiated with SO2 poisoning still remain. Though the deactivation of catalyst has retarded the progress of the low temperature SCR technology, there is not an effective method to solve the SO2 tolerance of catalysts. In order to develop the low temeprature SCR catalysts with high SO2 resistance, we propose a novel solution by preparing a core-shell titanium based catalyst loaded on graphene sheet. The core-shell catalysts can effectively shield the active phases from SO2 poisoning. Graphene which is a two-dimensional carbon sheet with one atom thickness layer has many unique properties such as high charge carrier mobility, large surface area, high transparency and high flexibility. Graphene is chosen as the catalyst carrier for the core-shell titanium based catalyst. The deposition rate of ammonium sulfate could be retarded on the surface of graphene. With the guidance of protection mechanism of core-shell catalysts loaded on the graphene sheet, the key factors that determined the resistance of the resulted catalysts will be ascertained. The research content proposed in the study is an essential part of the development of low temperature SCR technology. The expected results have important scientific value and application prospect, which determine whether the low temperature SCR technology could be suitable for industrial application or not.