To reduce NOx and PM emissions from heavy-duty diesel vehicles in China, NH3-SCR catalysts with high activity were designed and prepared. The research team on diesel engine emission control led by Prof. He also established automatic production lines for an SCR catalytic converter with an annual output of 700,000 sets. The developed SCR catalytic converters have been successfully integrated with heavy-duty diesel engines, achieving China IV and China V certifications, and commercially applied on a large scale. Based on these achievements, the research team won the national sciences & technology advanced prize (Second grade, 2014).
1. R&D of SCR catalysts with high performance
1.1. Based on the emission features of domestic heavy-duty diesel engines and high sulfur content diesel fuel, vanadium-based catalysts been modified and produced on a large scale, also exhibiting excellent low-temperature activity for NOx reduction and high thermal stability.
1.2. A one-step wash-coating procedure and the parameters for SCR catalyst preparation were successfully developed on the basis of a domestic large-size cordierite support. We also established automatic production lines for the SCR catalytic converter, with an annual output of 700,000 sets. The heavy-duty diesel engines fitted with our SCR catalytic converters achieved national certification, and have been commercially applied on a large scale.
2. Integration and application of the developed after-treatment system
2.1. The developed SCR catalytic converter, urea supply and storage unit, and SCR controller with OBD functions were successfully integrated and certified on different kinds of heavy-duty diesel vehicle engines. Reliability verification related to low-temperature climate compatibility, high-temperature climate compatibility, and high-altitude compatibility was also performed on heavy-duty vehicles fitted with the SCR system at drive distances up to millions of kilometers.
2.2. The developed SCR after-treatment system meets China IV and China V emission standards for heavy-duty diesel vehicles, with a price 50% lower than imported products with similar performance. The developed equipment has been commercially used in 1,500,000 heavy-duty diesel vehicles. Based on the achievements mentioned above, we won the national sciences & technology advanced prize (Second grade, 2014).
Performance test and application of SCR after-treatment system developed for heavy-duty diesel emission control
Relevant publications
20) Guangzhi He, Zhihua Lian, Yunbo Yu, Yang Yang, Kuo Liu, Xiaoyan Shi, Zidi Yan, Wenpo Shan, Hong He*, Polymeric vanadyl species determine the low-temperature activity of V-based catalysts for the SCR of NOx with NH3, Sci. Adv.,4, (2018) eaau4637.
19) Zidi Yan, Xiaoyan Shi*, Yunbo Yu, Hong He, Alkali resistance promotion of Ce doped vanadium-titanic based NH3-SCR catalysts, J. Environ. Sci., 73, (2018) 155-161.
18) Wenpo Shan, Fudong Liu*, Yunbo Yu,Hong He*, Chenglin Deng, Xinyun Zi, High-efficiency reduction of NOx emission from diesel exhaust using a CeWOx catalyst, Catal. Commun., 59 (2015) 226–228.
17) Fudong Liu, Yunbo Yu, Hong He*, Environmentally-benign catalysts for the selective catalytic reduction of NOx from diesel engines: Structure-activity relationship and reaction mechanism aspects, Chem. Commun., 50 (62), (2014) 8445–8463.
16) Fudong Liu, Wenpo Shan, Dawei Pan, Tengying Li, Hong He*, Selective catalytic reduction of NOx by NH3 for heavy-duty diesel vehicles, Chin. J. Catal., 35, (2014) 1438–1445.
15) Fudong Liu, Wenpo Shan, Xiaoyan Shi, Hong He*, Vanadium-based catalysts for the selective catalytic reduction of NOx with NH3, Progress in Chemistry, 24, (2012) 445-455. (in Chinese)
14) He Hong*, Liu Fudong, Yu Yunbo, Shan Wenpo, Environmental-friendly SCR technique (selective catalytic reduction) for the deNOx process from diesel engines, SCIENCE CHINA: Chemistry, 42, (2012) 446–468. (in Chinese)
13) He Hong*, Yu Yunbo, Li Yi, Wu Qiang, Zhang Xiuli, Zhang Changbin, Shi Xiaoyan, Song Xiaoping, Advances in mechanistic and practical studies on the selective catalytic reduction of NOx by oxygenated hydrocarbons over Ag/Al2O3, Chin. J. Catal., 31, (2010) 491–501. (in Chinese)
12) Hong He*, Yi Li, Xiuli Zhang, Yunbo Yu, Changbin Zhang, Precipitable silver compound catalysts for the selective catalytic reduction of NOx by ethanol, Appl. Catal. A, 375, (2010) 258–264.
11) Hong He*, Xiuli Zhang, Qiang Wu, Changbin Zhang, Yunbo Yu, Review of Ag/Al2O3-reductant system in the selective catalytic reduction of NOx, Catal. Surv. Asia, 12, (2008) 38–55.
10) Hongyi Dong, Shijin Shuai, Rulong Li, Jianxin Wang, Xiaoyan Shi, Hong He, Study of NOx selective catalytic reduction by ethanol over Ag/Al2O3 catalyst on a HD diesel engine, Chem. Eng. J., 135, (2008) 195–201.
9) Xiaoyan Shi, Yunbo Yu, Hong He*, Shijin Shuai, Hongyi Dong, Rulong Li, Combination of biodiesel-ethanol-diesel fuel blend and SCR catalyst assembly to reduce emissions from a heavy-duty diesel engine, J. Environ. Sci., 20, (2008) 177–182.
8) Changbin Zhang, Hong He*, Shijin Shuai, Jianxin Wang, Catalytic performance of Ag/Al2O3-C2H5OH-Cu/Al2O3 system for the removal of NOx from diesel engine exhaust, Environ. Pollut., 147, (2007) 415–421.
7) Hongyi Dong*, Shijin Shuai, Wenjuan Zhang, Rulong Li, Jianxin Wang, Xiaoyan Shi, Hong He, An ethanol SCR for NOx purification: performance evaluation on engine bench and demonstration on bus, SAE, 2007–01–1240.
6) Xiaobing Pang, Xiaoyan Shi, Yujing Mu*, Hong He, Shijin Shuai, Hu Chen, Rulong Li, Characteristics of carbonyl compounds emission from a diesel-engine using biodiesel-ethanol-diesel as fuel, Atmos. Environ., 40(36), (2006) 7057–7065.
5) Xiaoyan Shi, Xiaobing Pang, Yujing Mu, Hong He*, Shijin Shuai, Jianxin Wang, Hu Chen, Rulong Li, Emission reduction potential of using ethanol-biodiesel-diesel fuel blend on a heavy-duty diesel engine, Atmos. Environ., 40, (2006) 2567–2574.
4) Hong He*, Yunbo Yu, Selective catalytic reduction of NOx over Ag/Al2O3 catalyst: from reaction mechanism to diesel engine test, Catal. Today, 100, (2005) 37–47. Invited paper
3) Shijin Shuai, Jianxin Wang, Rulong Li, Jianjun Sun, Licheng Xiang, Hong He, Xiaoyan Shi, Performance evaluation and application of diesel NOx-SCR catalyst by ethanol reductant, SAE, 2005–01–1089.
2) Xiaoyan Shi, Yunbo Yu, Hong He*, Shijin Shuai, Jianxin Wang, Rulong Li, Emission characteristics using methyl soyate-ethanol-diesel fuel blends on a diesel engine, Fuel, 84(12–13), (2005) 1543–1549.
1) Bang-Quan He*, Shi-Jin Shuai, Jian-Xin Wang, Hong He, The effect of ethanol blended diesel fuels on emissions from a diesel engine, Atmos. Environ., 37, (2003) 4965–4971.
