Hongchang Zhu

Renmin University of China

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Junhua Li

Tsinghua University

Yue Peng

Tsinghua University

Tao Zhang

Xidian University

Jianjun Chen

State Key Joint Laboratory of Environment Simulation and Pollution Control

Luyao Guo

Changzhou University

Yu Qiu

Southeast University

Jiazhe Chen

Peking University

Wentian Yi

Renmin University of China

Yani Zhang

Shandong University of Technology

Xiaoxue Niu

Renmin University of China

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Renmin University of China

State Key Joint Laboratory of Environment Simulation and Pollution Control

Tsinghua University

Central South University

Tianjin University

Shandong University of Science and Technology

Zhejiang Normal University

China XD Group (China)

Shandong University of Technology

Chinese Research Academy of Environmental Sciences

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Balancing redox and acidic properties for optimizing catalytic performance of SCR catalysts: A case study of nanopolyhedron CeO -supported WO

Journal of environmental chemical engineering (2021)

Jiazhe Chen Luyao Guo Hongchang Zhu Yu Qiu Dejia Yin

Selective catalytic reduction

10.1016/j.jece.2021.105828

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Revealing the Synergistic Deactivation Mechanism of Hydrothermal Aging and SO₂ Poisoning on Cu/SSZ-13 under SCR Condition

Environmental Science & Technology (2021)

Yani Zhang Hongchang Zhu Tao Zhang Jie Li Jianjun Chen

In real-world application, Cu/SSZ-13 simultaneously suffers severe deactivation from hydrothermal aging and SO2 poisoning during the periodic regeneration of diesel particulate filter (DPF). Herein, we first investigated the synergistic deactivation mechanism of hydrothermal aging and SO2 poisoning on Cu/SSZ-13 under SCR condition. Hydrothermal aging alone induces more severe degradation of selective catalytic reduction (SCR) performance than SO2 poisoning alone, while the presence of SO2 during hydrothermal aging causes further worse SCR performance compared with hydrothermal aging alone. Hydrothermal aging not only damages Si-OH-Al sites, particularly in four-membered ring (4MR) of the CHA cage, but also brings the conversion of ZCuOH, leading to the formation of inactive CuO/CuAlOx species. By contrast, SO2 poisoning alone is more prone to promote the transformation of ZCuOH to Z2Cu. Synergistic deactivation of hydrothermal aging and SO2 poisoning would exacerbate the damage of Si-OH-Al sites and then the formation of CuO/CuAlOx species. These results are expected to assist the knowledge-based catalyst design for diesel aftertreatment applications.

Hydrothermal Synthesis

10.1021/acs.est.1c06068

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New Insight into the In Situ SO2 Poisoning Mechanism over Cu-SSZ-13 for the Selective Catalytic Reduction of NOx with NH3

Catalysts (2020)

Yu Qiu Chi Fan Changcheng Sun Hongchang Zhu Wentian Yi

To reveal the nature of SO2 poisoning over Cu-SSZ-13 catalyst under actual exhaust conditions, the catalyst was pretreated at 200 and 500 °C in a flow containing NH3, NO, O2, SO2, and H2O. Brunner−Emmet−Teller (BET), X-ray diffraction(XRD), thermo gravimetric analyzer (TGA), ultraviolet Raman spectroscopy (UV Raman), temperature-programmed reduction with H2 (H2-TPR), temperature-programmed desorption of NO+O2 (NO+O2-TPD), NH3-TPD, in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS), and an activity test were utilized to monitor the changes of Cu-SSZ-13 before and after in situ SO2 poisoning. According to the characterization results, the types and generated amount of sulfated species were directly related to poisoning temperature. Three sulfate species, including (NH4)2SO4, CuSO4, and Al2(SO4)3, were found to form on CZ-S-200, while only the latter two sulfate species were observed over CZ-S-500. Furthermore, SO2 poisoning had a negative effect on low-temperature selective catalytic reduction (SCR) activity, which was mainly due to the sulfation of active sites, including Z2Cu, ZCuOH, and Si-O(H)-Al. In contrast, SO2 poisoning had a positive effect on high-temperature SCR activity, owing to the inhibition of the NH3 oxidation reaction. The above findings may be a useful guideline to design excellent SO2-resistant Cu-based zeolite catalysts.

Selective catalytic reduction

10.3390/catal10121391

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Citations (24)