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Research Article

Promoting Effects of Spillover of Ammonia Species Caused by γ-Al2O3 on NH3-SCR over Rare Earth Tailings with In Situ DRIFTS

Limin Houa Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Inner Mongolia, China;b Key Laboratory of Efficient and Clean Combustion, School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia, P. R. ChinaView further author information
,
Shancong Fub Key Laboratory of Efficient and Clean Combustion, School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia, P. R. ChinaView further author information
,
Chaoyue Qiaob Key Laboratory of Efficient and Clean Combustion, School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia, P. R. ChinaView further author information
,
Wenfei Wua Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Inner Mongolia, China;b Key Laboratory of Efficient and Clean Combustion, School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia, P. R. ChinaCorrespondence[email protected]
View further author information
&
Jinyan Fub Key Laboratory of Efficient and Clean Combustion, School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia, P. R. ChinaView further author information
Received 13 May 2021, Accepted 09 Sep 2021, Published online: 21 Oct 2021
 
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ABSTRACT

Valuable information on adsorption and reaction of NO and NH3 on the rare earth tailings and rare earth tailings/γ-Al2O3 has been provided on the basis of the diffuse reflectance infrared Fourier transform spectroscopy experiments and characterization. The redox ability and acidity of rare earth tailings are enhanced after adding γ-Al2O3. The highest NO conversion achieved at 200 °C is 65% after adding γ-Al2O3, which is increased by 86%. The surface area of rare earth tailings/γ-Al2O3 is 96.3 m2/g. The improvement of NH3-SCR activity is attributed to the increase of the surface acidity, especially Brønsted acid sites. NH3 can be attributed to NH4+ on Brønsted acid sites and coordinated NH3 on Lewis acid sites on the rare earth tailings/γ-Al2O3. Spillover of ammonia species NH4+ between rare earth tailings and γ-Al2O3 exists. These NH4+ species (spillover) are activated to NH3+ and NH2+ on the Brønsted acid sites of rare earth tailings. Spillover of ammonia species NH4+ and activation are extremely significant for NH3-SCR reaction. The NH3-SCR reaction over rare earth tailings/γ-Al2O3 follows by both Eley–Rideal and Langmuir–Hinshelwood mechanisms especially by the Eley–Rideal mechanism. NH3NO and NH2NO are the vital intermediates of the reaction. The obtained results could provide some guidances in the application of catalyst got with rare earth tailings at low cost and application of rare earth tailings.

Acknowledgments

The authors ackowledge the financial support through start-up funds for talent introduction and scientific research in the institutions of the Inner Mongolia Autonomous Region.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [no. 51866013]; the Natural Science Foundation of Inner Mongolia of China [nos. 2019ZD13 and 2020BS05030], start-up funds for talent introduction and scientific research in the institutions of the Inner Mongolia Autonomous Region, and the National Key Research and Development Project [no. 2020YFC1909102].

Notes on contributors

Limin Hou

Limin Hou is Dr. with thermal engineering in 2019.

Shancong Fu

Shancong Fu is studying for a master's degree in heating engineering. 

Chaoyue Qiao

Chaoyue Qiao is studying for a master's degree in thermal engineering.

Wenfei Wu

Wenfei Wu is professor of thermal engineering.

Jinyan Fu

Jinyan Fu has obtained a master's degree in environmental engineering.

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