公开(公告)号：US20230391716A1

公开(公告)日：2023-12-07

申请号：US18035625

申请日：2022-01-07

申请人： Tsinghua University

发明人： Yue PENG ,  Junhua LI ,  Zhen CHEN ,  Haibo YIN ,  Rong WANG

IPC分类号： C07C273/16 ,  B01D53/78 ,  B01D53/56

CPC分类号： C07C273/16 ,  B01D53/78 ,  B01D53/56 ,  B01D2258/0283

摘要： The present disclosure relates to a method and a system for preparing urea by coupling denitration with electrocatalytic reduction. Specifically, the method of the present disclosure comprises: introducing an absorption solution containing nitrite and nitrate, which is generated by subjecting flue gas containing nitric oxide to a denitration step, into a separation step to separate the nitrite and the nitrate, thereby obtaining a solution rich in the nitrite and the nitrate; and introducing the solution rich in the nitrite and the nitrate generated in the separation step into an electrocatalysis step, and carrying out the electrocatalytic reduction in the presence of carbon dioxide or carbonate ions to generate a urea solution. The system of the present disclosure comprises: a denitration device, a separation device connected to the denitration device, and an electrocatalytic device connected to the separation device. The method and system of the present disclosure can be used for the deep removal of nitrogen oxides from industrial flue gas at a low temperature, and can achieve the recycling of nitrogen.

公开(公告)号：US20190224663A1

公开(公告)日：2019-07-25

申请号：US16332984

申请日：2017-09-28

申请人： TSINGHUA UNIVERSITY

发明人： Junhua LI ,  Lina GAN ,  Yue PENG ,  Shuangjiang YU ,  Dong WANG ,  Jianjun CHEN

IPC分类号： B01J37/08 ,  B01J23/22 ,  B01J23/30 ,  B01J23/00 ,  B01J37/00

摘要： The invention discloses a preparation method and application of a denitration catalyst with wide operating temperature for flue gas, which utilizes an organic vanadium compound as a vanadium precursor, and titanium dioxide powder or titanium tungsten powder as a carrier, and is prepared by mechanical ball milling method and heat treatment to obtain a catalyst, which denitration of fixed source flue gas under wide temperature range. Compared with the existing arts, the present invention includes minor modifications to the traditional vanadium tungsten titanium catalyst system and adopts the mechanical ball milling method, the activity and resistance to sulfur and water poisoning are improved significantly, thus providing a preparation technology of SCR denitration powder catalyst which is green, highly efficient, low cost and simple in operation. Through the interaction of the organic vanadium precursor with the carrier, the vanadium surface atom concentration of the catalyst is higher, the species of polymeric vanadium is more, and the vanadium oxide is more easily reduced, thereby obtaining higher denitrification activity at low temperature. The denitration catalyst of the present invention has relatively higher activity at 200-450° C. while having good resistance to sulfur and water poisoning.

公开(公告)号：US20190275509A1

公开(公告)日：2019-09-12

申请号：US16332967

申请日：2017-09-28

申请人： TSINGHUA UNIVERSITY

发明人： Junhua LI ,  Xiansheng LI ,  Xiang LI ,  Yue PENG ,  Jianjun CHEN

IPC分类号： B01J38/52 ,  B01J23/30 ,  B01J23/92 ,  B01J38/12 ,  B01D53/86 ,  B01D53/96

摘要： The invention belongs to the field of nitrogen oxide control in environmental protection science and technology, and particularly relates to the field of regeneration and utilization of SCR denitration catalyst with calcium poisoning, that is a neutral complex cleaning liquid and a regeneration method for denitration catalyst with calcium poisoning. The present invention uses a neutral polyether surfactant as a regeneration and calcium removal reagent to achieve a poisoned catalyst regeneration method with high calcium removal rate, low loss rate of active components and excellent recovery of denitrification activity; wherein the content of the polyether surfactant is in the range of 0.1-1 wt %; by the regeneration method of the present invention, the loading of active components which is required in the conventional regeneration process can be omitted, while the corrosion of equipment and catalyst can be reduced, thus capable of regenerating the denitration catalyst with high efficiency.

公开(公告)号：US20240238763A1

公开(公告)日：2024-07-18

申请号：US18689831

申请日：2022-01-14

申请人： Tsinghua University

发明人： Wenzhe SI ,  Yun DING ,  Yue PENG ,  Jianjun CHEN ,  Yongliang MA ,  Junhua LI

IPC分类号： B01J23/34 ,  B01D53/86 ,  B01J23/00 ,  B01J37/00 ,  B01J37/04 ,  B01J37/08

CPC分类号： B01J23/34 ,  B01D53/8668 ,  B01J23/002 ,  B01J37/0018 ,  B01J37/04 ,  B01J37/088 ,  B01D2255/2063 ,  B01D2255/2073 ,  B01D2255/402 ,  B01D2257/708

摘要： Provided in the present disclosure is a preparation method for a La1−xMn1+xO3 catalyst, comprising the steps: dissolving a lanthanum salt, a manganese salt, and a nonionic surfactant in solvent to obtain a precursor solution; drying the precursor solution to obtain a viscous solid; calcining the viscous solid to obtain a La1−xMn1+xO3 catalyst, wherein 0≤x