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Efficiency of Phosphotungstic Acid Modified Mn-Based Catalysts to Promote Activity and N2 Formation for Selective Catalytic Reduction of NO with Ammonia

  • Yongqiang Huang , Peixin Li , Runduo Zhang EMAIL logo and Ying Wei EMAIL logo
Published/Copyright: January 22, 2019
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International Journal of Chemical Reactor Engineering
From the journal International Journal of Chemical Reactor Engineering Volume 17 Issue 7

Abstract

In this work, the modified Mn-based NH3-SCR (NH3 low-temperature selective catalytic reduction) catalysts with excellent NO conversion and N2 selectivity be designed. N2 yield was hardly more than 75 % over MnOx/TiO2 for NH3-SCR reaction, whereas the NH3-SCR performance has been significantly improved by using 50 wt.% HPW (H3PW12O40)-MnOx/TiO2. 100 % NO conversion and more than 95 % N2 yield was obtained in wide operating temperature window (150–400°C), suggesting that the addition of HPW could effectively improve the NO reduction conversion. After that, the catalysts were further characterized by XRD, H2-TPR, XPS and in situ DRIFT. DRIFT analysis implied that the introduction of HPW significantly improve the capacity of NH4+ species adsorbed on Brønsted acid sites accompanied with inhibiting the formation and consumption of nitrite species. It proved that the non-selective catalytic reduction reaction over HPW-MnOx/TiO2 catalysts are restrained. HPW could accelerate the formation and consumption of NH4+ species adsorbed on Brønsted acid sites with deactivation of nitrate species. In addition, NH3(ad) could be hardly oxidized to NH species and then reacted with nitrate species (L-H mechanism) and gaseous NO (E-R mechanism). More importantly, the oxidation of NH3 was also suppressed, which plays a dominate role to form N2O above 300°C. Besides, the deactivation of potassium poisoning on the SCR activity significantly weakened for modified samples compared to parent catalyst.

Keywords: phosphotungstic acid; MnOx/TiO2; NH3-SCR; N2 yield; in situ DRIFT

Funding statement: Funder Name: the Fundamental Research Funds for the Central Universities, Funder Id:, Grant Number: JD1819 and XK1802-1. Funder Name: the National Natural Science Foundation of China, Funder Id:, Grant Number: U1862102.

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Supplementary Material

The online version of this article offers supplementary material (DOI:https://doi.org/10.1515/ijcre-2018-0057).

Received: 2018-03-15
Revised: 2018-10-11
Accepted: 2018-12-26
Published Online: 2019-01-22

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/ijcre-2018-0057
Keywords for this article
phosphotungstic acid; MnOx/TiO2; NH3-SCR; N2 yield; in situ DRIFT

Articles in the same Issue

  1. Articles
  2. Mars van Krevelen Mechanism for the Selective Partial Oxidation of Ethane
  3. Multi-Objective Optimization of an ABE Fermentation System for Butanol Production as Biofuel
  4. Synthesis of Ethyl Phenol over Modified HZSM-5 Catalyst in a Fixed Bed Reactor
  5. Signal Synthesis Model Reference Adaptive Controller with Genetic Algorithm for a Control of Chemical Tank Reactor
  6. Efficiency of Phosphotungstic Acid Modified Mn-Based Catalysts to Promote Activity and N2 Formation for Selective Catalytic Reduction of NO with Ammonia
  7. Mathematical Modelling and Simulation of a Trickle-Bed Reactor for Hydrotreating of Petroleum Feedstock
  8. Improving Wastewater Nitrogen Removal and Reducing Effluent NOx--N by an Oxygen-Limited Process Consisting of a Sequencing Batch Reactor and a Sequencing Batch Biofilm Reactor
  9. CFD Simulation of the Particle Dispersion Behavior and Mass Transfer–Reaction Kinetics in non-Newton Fluid with High Viscosity
  10. Comparison of Euler-Euler and Euler-Lagrange Approaches for Simulating Gas-Solid Flows in a Multiple-Spouted Bed
  11. Numerical Study of Coal Composition Effects on the Performance of Gasification Through Computational Fluid Dynamic
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