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RESEARCH ARTICLE
Contents Vol 75(3)

Study of the performance of nitrogen-doped modified activated carbon as catalyst carrier for the selective catalytic reduction of NO with NH3 at low temperatures

Xiangdong Feng A , Shanjian Liu https://orcid.org/0000-0002-8756-9595 A * , Yongjun Li A , Ranran Kong A and Jianjie He A
+ Author Affiliations
- Author Affiliations

A School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China.

* Correspondence to: liushanjian08@163.com

Handling Editor: Deanna D’Alessandro

Australian Journal of Chemistry 75(3) 197-205 https://doi.org/10.1071/CH21237
Submitted: 16 September 2021  Accepted: 25 November 2021   Published: 22 February 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

Nitrogen-doped modified activated carbons (ACs) were prepared from coconut shell, date shell and almond shell using the urea modification method. NO tests of NH3 selective catalytic reduction (NH3-SCR) were conducted to evaluate the efficiency of different types of nitrogen-doped modified AC as denitration catalyst carriers between 50–220°C. Both AC and nitrogen-doped modified AC had catalytic effects on NO conversion; the nitrogen-doped modified AC had high denitrification activity in the low-temperature region, and NAC1-10 achieved an NO conversion rate of 65.7% at 50°C. The low-temperature denitrification activity of urea-modified AC was twice that of the untreated AC at all temperatures. The O2 concentration in the SCR reaction system had a significant effect on the NO conversion rate of the nitrogen-doped modified AC. As the O2 concentration increased from 0 to 1 vol%, the NO conversion rate increased rapidly from 22 to 65% and remained stable at 65%. A series of characterisation tools were used to determine the structure and physicochemical properties of the nitrogen-doped modified AC, including BET, XRD, elemental analysis, and FTIR. Nitrogen-doped AC showed good air velocity adaptability and low-temperature stability, suggesting that it is a promising carrier for NH3-SCR catalysts.

Keywords: Carbon, Catalyst carrier, Coconut, Denitrification, Low‐temperature, Nitrogen‐doped, NO, SCR.


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