Development of highly active coated monolith SCR catalyst with strong abrasion resistance for low-temperature application

doi:10.1007/s11783-015-0824-8

Front. Environ. Sci. Eng.

2015, Vol. 9

Issue (6) : 979-987 https://doi.org/10.1007/s11783-015-0824-8

RESEARCH ARTICLE

Development of highly active coated monolith SCR catalyst with strong abrasion resistance for low-temperature application

Lina GAN^1,²,Shan LEI¹,Jian YU¹,Hongtao MA³,Yo YAMAMOTO³,Yoshizo SUZUKI⁴,Guangwen XU^1,^*(

),Zhanguo ZHANG^4,^*(

)

1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Materials Research Department, Materials Research Laboratories, Research and Development Group, Meidensha Corporation, 8-1, Osaki 2-Chome Shinagawa-ku, Tokyo 141-8565, Japan
4. National Institute of Advanced Industrial Science and Technology (AIST), Onogawa 16-1, Tsukuba 305-8569, Japan

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Abstract

Monolith SCR catalysts coated with V₂O₅-WO₃/TiO₂ were prepared by varying binder and coating thickness. Comparing with a monolith extruded with 100% V₂O₅-WO₃/TiO₂ powder, a coated monolith with a catalyst-coating layer of 260 μm in thickness exhibited the similar initial NO_x reduction activity at 250°C. After 4 h abrasion (attrition) in an air stream containing 300 g·m⁻³ fine sands (50–100 μm) at a superficial gas velocity of 10 m·s⁻¹, the catalyst still has the activity as a 100% molded monolith does in a 24-h activity test and it retains about 92% of its initial activity at 250°C. Estimation of the equivalent durable hours at a fly ash concentration of 1.0 g·m⁻³ in flue gas and a gas velocity of 5 m·s⁻¹ demonstrated that this coated monolith catalyst is capable of resisting abrasion for 13 months without losing more than 8% of its initial activity. The result suggests the great potential of the coated monolith for application to de-NO_x of flue gases with low fly ash concentrations from, such as glass and ceramics manufacturing processes.

Keywords coated monolith low-temperature denitration abrasion resistance attrition

Corresponding Author(s): Guangwen XU,Zhanguo ZHANG

Online First Date: 16 November 2015 Issue Date: 23 November 2015

Cite this article:

Lina GAN,Shan LEI,Jian YU, et al. Development of highly active coated monolith SCR catalyst with strong abrasion resistance for low-temperature application[J]. Front. Environ. Sci. Eng., 2015, 9(6): 979-987.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-015-0824-8
https://academic.hep.com.cn/fese/EN/Y2015/V9/I6/979

Tab.1 BET surface area, pore volume and average pore diameter of the catalyst

Fig.1 Characterization of active V₂O₅-WO₃/TiO₂ powder and extruded and coated monoliths. (a) XRD pattern of V₂O₅-WO₃/TiO₂ powder, (b) TEM image of V₂O₅-WO₃/TiO₂ powder, (c) photos of blank and coated monoliths

Fig.2 Schematic diagram of the experimental setup for accelerated abrasion tests

Fig.3 Effect of binders on abrasion resistance of coating layers. (a) Weight losses of four coated monoliths A, B, C and D, (Conditions: 1 h, gas velocity 10 m·s⁻¹, silicasand concentration 300 g·m⁻³), (b) photos of cross-sections of the coated monoliths A and C before and after a 5 h abrasion test. (Conditions: 5 h, gas velocity 10 m·s⁻¹, silicasand concentration 300 g·m⁻³)

Fig.4 Effect of coating thickness on de-NO_x activity at 250°C. (a) Monolith C with different coating thicknesses from 30 to 180 µm, (b) Monolith D with different coating thicknesses from 80 to 260 µm (NO: 400 ppm, SO₂: 1000 ppm, O₂: 5 vol.%, H₂O: 10 vol.%, NH₃/NO= 1, reaction temperature 250°C, superficial velocity 5.7 m·s⁻¹)

Fig.5 N₂ adsorption-desorption isotherms and pore size distributions of V₂O₅-WO₃/TiO₂ powder and coated monoliths C4 and D4

Fig.6 Effect of abrasion time on de-NO_x activity and weight loss per hour for coated monoliths C4, D4 and 100%-molded (NO: 400 ppm, SO₂: 1000 ppm, O₂: 5 vol.%, H₂O: 10 vol.%, NH₃/NO= 1, reaction temperature 250°C, superficial velocity 5.7 m·s⁻¹)

Fig.7 Catalytic stability of coated monoliths C4 and D4 after accumulative 4-h abrasion tests. (NO: 400 ppm, SO₂: 1000 ppm, O₂: 5 vol.%, H₂O: 10 vol.%, NH₃/NO= 1, reaction temperature 250°C, superficial velocity 5.7 m·s⁻¹)

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