Commercial Selective Catalytic Reduction Catalyst Research Articles

Commercial SCR catalyst modified with Cu metal to simultaneously efficiently remove NO and toluene in the fuel gas.

Developing an environmentally friendly selective catalytic reduction (SCR) catalyst to effectively eliminate both nitric oxides (NO) and toluene has garnered significant attention for regulating emissions from automobiles and the combustion of fossil fuels. This study synthesized a series of novel commercial V2O5-WO3/TiO2 catalysts modified with Cu through the wet impregnation method, which was employed to simultaneously remove NO and toluene from the fuel gas. The assessment of catalyst removal performance was conducted at a selective catalytic reduction system, and the experimental results showed a significant increase in the catalytic activity due to the modification of the copper metal. The 10% Cu/SCR catalyst showed a superior activity that the NO and toluene conversion reached 100% and 95.56% at 300 °C, respectively. Subsequently, various characterization techniques were employed to investigate the crystal phase, morphology, physical features, chemical states, and surface acidity properties of the synthesis catalysts. According to the characterization results, the presence of Cu metal did not have a noticeable impact on the physical property. However, the redox performance was enhanced, and the number of surface acidic sites was also increased after adding Cu to the SCR catalyst. Furthermore, the redox cycle of Cu metal and V species was facilitated to produce more active oxygen which helped to improve the NO and toluene conversion. This work offered a novel perspective into the synergistic oxidation of both NO and toluene, which was potentially relevant for improving the selective catalytic reduction process in coal-fired power plants.

Promotional Effects of FeOx on the Commercial SCR Catalyst for the Synergistic Removal of NO and Dioxins from Municipal Solid Waste Incineration Flue Gas

In view of the atmospheric pollutants in flue gas raised by municipal solid waste (MSW) incineration, simultaneous abatement of nitric oxide and dioxins is the keystone to alleviate the existing environmental issues. By using the commercial selective catalytic reduction (SCR) catalyst, nitric oxide and dioxins can be directly removed in separate temperature windows, while the catalytic performances still remain unsatisfactory. Herein, a collection of commercial V2O5–MoO3/TiO2 (VMT) catalysts modified with transition metal oxides were prepared in this study, and their synergistic removal activities for NO and dioxins were systematically investigated. Catalyst performance tests indicated that the loading of FeOx demonstrated considerable promotional effects. To further elucidate the enhancing mechanism of FeOx doping on the physical and chemical properties of the catalyst, a series of characterizations were conducted. The results indicated that FeOx increased the specific surface area and pore volume of the catalyst, which was more conducive to the dispersion of vanadium species. The modification with FeOx also enriched surface acid centers, as well as the V5+ species on the catalyst surface, so that the adsorption and destruction efficiencies of both nitric oxide and dioxins were further increased. Furthermore, the abundant chemisorbed oxygen species and the redox capacity of the catalyst were intensified, owing to the newly formed Fe3+–V4+/Fe2+–V5+ catalytic redox cycle.

Improvement in the resistance to KCl and PbCl2 synergistic poisoning of the commercial SCR catalyst by Ce(SO4)2 modification: A combined experimental and spin-polarized DFT study

The commercial selective catalytic reduction (SCR) catalysts are vulnerable to the synergistic poisoning of K and Pb species in flue gas, two common and typical components that can trigger severe damage on the physical and chemical properties of the catalysts. In this study, a Ce(SO4)2-V2O5-MoO3/TiO2 catalyst with 15 wt% Ce(SO4)2 loading was developed which maintained high activity under the synergistic poisoning of 2 wt% KCl and PbCl2. The resistance mechanisms were explored by a series of characterization techniques and density functional theory (DFT) calculations. The results indicated that the enhancement on the resistance to the synergistic poisoning of K and Pb species by the introduction of Ce(SO4)2 could be elucidated in three aspects. Firstly, the interactions between Ce(SO4)2 and K/Pb species protected the V and Mo species from the synergistic poisoning. Secondly, the Ce4+/Ce3+ redox couples and large amounts of chemisorbed oxygen improved the redox ability of the catalyst. Finally, the Ce(SO4)2 modified catalyst maintained a high surface acidity despite the synergistic poisoning of K and Pb species, which was beneficial for the adsorption of NH3 species and the following SCR process.

Effects of SCR catalyst breakage on mercury emission properties in coal-fired power plant: field testing and laboratory evaluation

Field testing toward mercury emission properties was conducted at a 300 MW coal-fired power station. Selective catalytic reduction (SCR) was found to reduce Hg content in flue gas significantly through catalyst breakage during the commercial testing in a 300 MW coal-fired power station. Field testing results indicate that the total mercury concentration in flue gas at electrostatic precipitator (ESP) inlet and ESP outlet increase due to SCR catalyst breakage. Correspondingly, mercury content in fly ash decrease and mercury content in gypsum increase. The evolution in laboratory confirmed the Hg0 oxidation capability of commercial SCR catalyst. Catalyst breakage leads to space velocity increasing, so that the lower Hg0 oxidation rates caused the mercury transformation change in flue gas and solid byproducts.

Effects of Chlorine Addition on Nitrogen Oxide Reduction and Mercury Oxidation over Selective Catalytic Reduction Catalysts.

The effect of chlorine on mercury oxidation and nitrogen oxides (NOx) reduction over selective catalytic reduction (SCR) catalysts was investigated in this study. Commercial SCR catalysts achieved a high Hg0 oxidation efficiency when Cl2 was sprayed into the flue gas. Results indicated that an appropriate concentration of Cl2 was found to promote NOx reduction and Hg0 oxidation significantly. An optimal concentration of Cl2 (25 ppm) was found to significantly promote NOx reduction and Hg0 oxidation. Moreover, we studied the effects of Cl2 on NOx reduction and Hg0 oxidation over SCR catalysts under different concentrations of SO2. The SO2 poisoning effect was decreased by Cl2 when the SO2 concentration was low (below 1500 ppm). However, sulfate gradually covered the catalyst surface over time during the reaction, which limited the impact of Cl2. Finally, different sulfur-poisoned catalysts were examined in the presence of Cl2. The NOx reduction and Hg0 oxidation performances of sulfate-poisoned catalysts improved when Cl2 was added to the flue gas. Mechanisms for NOx reduction and Hg0 oxidation over fresh catalysts and sulfate-poisoned catalysts in the presence of Cl2 were proposed in this study. The mechanism of Cl2-influenced NOx reduction was similar to that for the NH3-SCR process. With Cl2 in the flue gas, the number of Brønsted active sites increased, which improved catalytic activity. Furthermore, Cl2 reoxidized V4+–OH to V5+=O and caused the NH3-SCR process to operate continuously. The Langmuir–Hinshelwood mechanism was followed for Hg0 oxidation by SCR catalysts when Cl2 was in the flue gas. Cl2 increased the number of Lewis active sites, and catalytic activity increased. Hg0 adsorbed on the surface of the catalysts and was then oxidized to HgCl2. Adding Cl2 to the flue gas increased the strength and number of acid sites on sulfate-poisoned catalysts.

Photo- and thermo-catalytic mechanisms for elemental mercury removal by Ce doped commercial selective catalytic reduction catalyst (V2O5/TiO2)

The elemental mercury was catalytically removed by V2O5/TiO2 and Ce doped V2O5/TiO2 catalysts under the UV irradiation at 30–160 °C to determine whether the catalysts could simultaneously have both thermo- and photo-catalytic activities. The physicochemical properties of catalysts were characterized by XRD, SEM, EDX, BET, XPS, UV–visible, PER and EIS. The experimental results demonstrated that V2O5/TiO2 and Ce-doped catalysts possessed both thermo- and photo-catalytic reactivities. A suitable reaction temperature (120 °C) and UV light had promoting effects on mercury removal efficiency. In addition, owing to the high oxidation capability as well good oxygen storage performance of Ce4+, Ce doping could greatly improve the mercury removal properties of the catalyst, reduce the inhibition of SO2 and make NO the component with enhanced effect. Ce doping also had the capability of enhancing the light absorption intensity in the UV region as well as the separation rate of photoinduced carriers. Finally, DFT calculations of V-Ti and Ce-V-Ti for Hg0 removal were investigated to further verify the experimental conclusion.

Intrinsic mechanism insight of the interaction between lead species and the Vanadium-based catalysts based on First-principles investigation

Lead (Pb) species trigger serious poisoning of selective catalytic reduction (SCR) catalysts. To improve the Pb resistance ability, revealing the impact mechanism of Pb species on the commercial SCR catalysts from a molecular level is of great significance. Herein, first-principles calculations were applied to unveil the Pb adsorption mechanism on the vanadium-based catalysts, the results were also compared with the previous experimental findings. The intrinsic interaction mechanism between Pb and catalyst components was interpreted by clarifying the change of the catalyst electronic structures (including charge transfer, bond formation situations, and active sites reactivities). It is found that the adsorption of Pb species belongs to chemisorption, evident electron transfer with the catalyst surface is inspected and intense charge transfer indicates strong adsorption. A remarkable interaction with the V = O active sites occurs and stable Pb-O bonds are formed, which significantly changes the electronic structures of the V = O sites and inhibits the NH3 adsorption, thus suppressing the SCR activity. Finally, thermodynamic analysis was applied to elucidate the temperature influence on Pb adsorption. It is found that Pb adsorption on catalysts cannot proceed spontaneously over 500 K. At higher temperatures the adsorption is inhibited and the Pb species become less stable, which partially explains why the Pb-poisoning effect at high temperatures is relatively moderate than that at low temperatures.

Enhancement of Hg0 oxidation removal in chloride-free flue gas over FeOCl-modified commercial selective catalytic reduction catalyst

SCR denitration catalysts have been considered for the synergistic catalytic oxidation of gaseous elemental mercury (Hg0) depending on HCl in flue gas. In this study, FeOCl was used for the enhancement of Hg0 removal in chloride-free flue gas over a commercial SCR catalyst. The results indicated that loading 10% FeOCl can significantly improve the Hg0 removal efficiency of SCR catalyst to 97% at 250 °C in chloride-free flue gas. O2 exerted an important positive effect on the conversion of Hg0 to HgO. The FeOCl/SCR catalyst exhibited satisfactory SO2 and H2O resistance. The examination of the mechanism of action indicated that Hg0 reacts with •Cl released from FeOCl/SCR to form HgCl2. A spot of Hg0 can directly react with adsorbed surface oxygen to generate HgO fixed on the active site of FeO on the FeOCl/SCR catalyst via chemisorption.

Safe disposal of deactivated commercial selective catalytic reduction catalyst (V2O5-MoO3/TiO2) as a low-cost and regenerable sorbent to recover gaseous elemental mercury in smelting flue gas

The reduction of Hg emissions from non-ferrous metal smelting was proposed in the Minamata Convention. Regenerable sulfureted MoO3/TiO2, which displayed excellent performance in capturing gaseous Hg0, was once developed by us to recover gaseous Hg0 in smelting flue gas (SFG) for centralized control. Recently, a large amount of spent commercial selective catalytic reduction catalysts (for example V2O5-MoO3/TiO2) mostly deactivated by CaSO4 was formed, creating a need for their safe disposal. As the main constituent of deactivated V2O5-MoO3/TiO2 is MoO3/TiO2, deactivated V2O5-MoO3/TiO2 was sulfureted to capture gaseous Hg0 from SFG for its safe disposal and the effects of V2O5 and CaSO4 on Hg0 adsorption onto sulfureted MoO3/TiO2 were investigated. Although the capturing capacity of sulfureted MoO3/TiO2 moderately decreased after the impregnation of V2O5 and CaSO4, sulfureted deactivated V2O5-MoO3/TiO2 still displayed excellent performance and reproducibility in gaseous Hg0 capture. Meanwhile, the cost performance of sulfureted deactivated V2O5-MoO3/TiO2 for Hg0 capture was outstanding as deactivated V2O5-MoO3/TiO2 needs to be safely disposed. Therefore, deactivated V2O5-MoO3/TiO2 can be sulfureted as a regenerable and low-cost sorbent that is effective in recovering gaseous Hg0 from SFG, as well as being a cost-effective and environmentally friendly method for the safe disposal of spent V2O5-MoO3/TiO2.

In situ treatment by high-temperature water vapor as a novel health-care approach for commercial SCR catalyst

Commercial selective catalytic reduction (SCR) catalysts used in a 1000 MW coal-fired power plant were in situ treated by high-temperature water vapor. The de-NOx efficiency of the deactivated catalyst increased about 25–30%, comparable to fresh commercial SCR catalysts, after being treated with simulated flue gas with 15–20 vol% high-temperature water vapor. It indicates that treatment by in situ 15–20 vol% high-temperature water vapor could significantly extend the lifetime of commercial SCR catalyst. High-temperature water vapor could remove Fe, Na, Ca, sulphate species and SiO2 depositing on SCR catalyst. Compared with the deactivated catalyst, the specific surface area, the ratio of V4+/V5+ and Lewis acid content of health-care catalyst increased from 41.679 to 44.596 m2·g−1, 1.35 to 1.80 and 45.5 to 73.8%, respectively. Density functional theory (DFT) calculation demonstrated that the electrons transferred from H2O molecule to V5+ cations in the process of H2O adsorption and the subsequent hydroxylation of V5+cations during H2O dissociation contribute to the reduction of V5+ to V4+ on the SCR catalyst.

Severe deactivation and artificial enrichment of thallium on commercial SCR catalysts installed in cement kiln

Thallium (Tl) poisoning is reported for the first time occurring on selective catalytic reduction (SCR) catalysts running in a certain cement kiln. NOx conversion of the poisoned catalyst is almost lost with 6.4 % Tl loading even at 400 °C. Besides the decrease of the BET surface area, Tl significantly decreases the oxidation ability of the active sites due to the coverage effect. Tl is present as both Tl2O3 and Tl2SO4 and covers both the Lewis and Brønsted acid sites of V2O5 and the Ti(OH)Ti bridging sites of TiO2, leading to a marked decrease in the quantity and strength of acid sites. Similar to the regeneration of alkali-poisoning catalysts, dilute H2SO4 is also effective to remove partial surface Tl2O3, by which yielded 89 % of Tl removal with a 0.4 M H2SO4. However, the SCR performance could not total recover because of the remnant Tl2O3 on the catalyst regenerated only once.

Unraveling the Unexpected Offset Effects of Cd and SO2 Deactivation over CeO2-WO3/TiO2 Catalysts for NOx Reduction.

It is challenging for selective catalytic reduction (SCR) of NOx by NH3 due to the coexistence of heavy metal and SO2 in the flue gas. A thorough probe into deactivation mechanisms is imperative but still lacking. This study unravels unexpected offset effects of Cd and SO2 deactivation over CeO2-WO3/TiO2 catalysts, potential candidates for commercial SCR catalysts. Cd- and SO2-copoisoned catalysts demonstrated higher activity for NOx reduction than a Cd-poisoned catalyst but lower than that for an SO2-poisoned catalyst. In comparison to SO2, Cd had more severe effects on acidic and redox properties, distinctly decreasing the SCR activity. After sulfation of Cd-poisoned catalysts, SO42- preferentially bonded with the surface CdO and released CeO2 active sites poisoned by CdO, thus reserving the highly active CeO2-WO3 sites and maintaining a high activity. The sulfation of Cd-poisoned catalysts also provided more strong acidic sites, and the synergistic effects between the formed cerium sulfate and CeO2 contributed to the high-temperature SCR performance. This work sheds light on the deactivation mechanism of heavy metals and SO2 over CeO2-WO3/TiO2 catalysts and provides an innovative pathway for inventing high-performance SCR catalysts, which have great resistance to heavy metals and SO2 simultaneously. This will be favorable to academic and practical applications in the future.

Tailored Alkali Resistance of DeNOx Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species

SummaryIt is still challenging to develop strongly alkali-resistant catalysts for selective catalytic reduction of NOx with NH3. It is generally believed that the maintenance of acidity is the most important factor because of neutral effects of alkali. This work discovers that the redox properties rather than acidity play decisive roles in improving alkali resistance of some specific catalyst systems. K-poisoned Fe-decorated SO42−-modified CeZr oxide (Fe/SO42−/CeZr) catalysts show decreased acidity but reserve the high redox properties. The higher reactivity of NHx species induced by K poisoning compensates for the decreased amount of adsorbed NHx, leading to a desired reaction efficiency between adsorbed NHx and nitrate species. This study provides a unique perspective in designing an alkali-resistant deNOx catalyst via improving redox properties and activating the reactivities of NHx species rather than routinely increasing acidic sites for NHx adsorption, which is of significance for academic interests and practical applications.

Temperature sensitivity of the selective catalytic reduction (SCR) performance of Ce-TiO2 in the presence of SO2.

Cerium titanate catalyst (Ce-TiO2) is competitive as a substitute for the commercial SCR (selective catalytic reduction) catalysts VO5-WO2/TiO2 due to its high SCR activity and excellent redox performance. The reaction mechanisms of Ce-TiO2 at 180°C, 240°C, and 300°C in the presence of SO2 were systematically studied regarding the evolution of the SCR activity, quantitative analysis of sulfate compounds, and comprehensive identification of the fresh and poisoned catalysts. The results demonstrated that NO conversion at 180°C in the presence of SO2 is highly sensitive to the formation of cerium sulfates/sulfites, limiting the reactivity of NH4+ adsorbed on SO Brønsted acid sites and inhibiting the E-R reaction pathway. At 240°C, the degradation of NO conversion was commenced by the cumulative influence of cerium sulfates/sulfites. With the increase of the reaction temperature to 300°C, the NO conversion is gradually immune to the formation of cerium sulfates in spite of the great amount of cerium sulfates deposited on the deeper interior of CeO2. The high SCR activity of the Ce-TiO2 catalyst in the presence of SO2 at a higher reaction temperature might be ascribed to the synergistic catalysis between surface cerium sulfates and bulk CeO2, where surface cerium sulfates act as acid sites for the adsorption of NH3 and the bulk CeO2 acts as the redox sites. The reaction mechanisms of the Ce-TiO2 catalyst in the presence of SO2 at different temperatures are proposed as the two reaction routes.

Regeneration of commercial SCR catalyst deactivated by arsenic poisoning in coal-fired power plants

Arsenic species, which are inevitable components in flue gas from the coal combustion process, will result in severe deactivation of selective catalytic reduction (SCR) catalysts. In this paper, a novel method is proposed to regenerate the arsenic-poisoned commercial V2O5-MoO3/TiO2 catalyst collected from coal-fired power plants, including ammonia washing, H2 reduction, and air calcination. Activity tests indicated that the proposed method could recover the catalyst activity more than 96% of the fresh catalyst. Furthermore, detailed characterizations results indicated that this regeneration method could not only effectively remove the arsenic species, but also recover the active constituents of the catalysts to a considerable level. The proposed method offers a feasible strategy for the regeneration of poisoned commercial SCR catalysts and can effectively reduce the total denitrification cost for coal-fired power plants.

Effects of insulation on exhaust temperature and subsequent SCR efficiency of a heavy-duty diesel engine

Ammonia/urea selective catalytic reduction (SCR) is an efficient technology to control NOx emission from diesel engines. One of the critical challenges of SCR systems is its lack of catalytic activities in low temperature conditions such as cold start or warm-up periods. In this study, the effect of pipe insulation on the reduction of exhaust temperature drop was experimentally investigated based on dynamometer tests with a heavy-duty non-road diesel engine. The temperature drop of exhaust gas was measured with and without applying pipe insulation. Measurement results revealed that the effect of insulation on the mitigation of temperature loss becomes significant as engine brake power decreases. Thus, it is expected that the need for pipe insulation would be increased to keep SCR deNOx efficiency high, especially at low temperature conditions. Also, this study carried out numerical simulations to quantify the impact of pipe insulation on NOx conversion efficiency of a commercial SCR catalyst over a scheduled non-road transient cycle (NRTC) mode. Under the current heavy-duty non-road engine and SCR conditions, the application of pipe insulation would reduce 19.5 % of total cumulative tail-out NOx emission over NRTC hot mode. These results led to the cycle-averaged SCR efficiency of 98.2 % for ‘with insulation’, while it was predicted to be lowered to 97.6 % for ‘without insulation’.

A modelling approach to kinetics study and novel monolith channel design for selective catalytic reduction (SCR) applications

A systematic modelling approach was scrutinized to develop a kinetic model and design a novel monolith channel geometry for selective catalytic reduction (SCR) applications. An equation-oriented modelling tool, gPROMS® ProcessBuilder®, was employed to build the kinetic model for a commercial SCR catalyst by extracting intrinsic kinetic parameters from the experimental data collected in a conventional fixed-bed reactor in which resistances to mass and heat transfer were expected to be an influence. All catalytic chemical reactions and relevant transport phenomena were simultaneously considered for the kinetic model development. The kinetic model and parameters estimated were then summarized in a form of a user-defined function that would be utilized in a commercial computational fluid dynamics (CFD) package, ANSYS® Fluent®, to search for a novel SCR monolith channel geometry. An elongated hexagonal channel was found to have better performance in terms of NO conversion and pressure drop, in comparison with a conventional square channel.

Mercury oxidation over Cu-SSZ-13 catalysts under flue gas conditions

Increasing concerns over mercury (Hg) emissions from coal-fired power plants have led to the implementation of various novel technologies. Selective catalytic reduction (SCR) catalysts have shown promise as bifunctional catalysts for limiting both nitrogen oxide and Hg emissions. Cu-SSZ-13 has shown promise as a SCR catalyst for diesel exhaust, but has not yet been investigated for coal-fired plant application where Hg oxidation would be of great importance. To develop the next generation of SCR catalysts, Cu-SSZ-13, a small pore zeolite, was investigated for its ability to oxidize Hg under a variety of flue gas conditions. The Cu-SSZ-13 catalyst was compared to SSZ-13 to understand the effect of copper (Cu) in the Hg oxidation mechanism. The Hg oxidation performances of both zeolites were compared to that of a commercial SCR catalyst as a benchmark. All catalysts required hydrogen chloride (HCl) to exhibit any Hg oxidation with the zeolites outperforming the commercial catalyst. However, the activity of all catalysts significantly decreased in the presence of either sulfur oxides (SOx) or SCR reactants (nitrogen oxide (NO) + ammonia (NH3)) in the flue gas, with SOx having a greater effect on Cu-SSZ-13 and SCR reactants having a greater one on the commercial catalyst. Additionally, it was determined that while Cu was the active site for the SCR reaction, it did not enhance Hg oxidation. In fact, in the presence of SO2, Cu actually contributed to the deactivation of the catalyst for Hg oxidation.

Coexistence of enhanced Hg0 oxidation and induced Hg2+ reduction on CuO/TiO2 catalyst in the presence of NO and NH3

Simultaneous nitrogen monoxide (NO) reduction and elemental mercury (Hg0) oxidation in the presence of ammonia (NH3) was for the first time studied on a copper oxide/titanium dioxide (CuO/TiO2) catalyst at low flue gas temperatures. More than 80% NO reduction and 90% Hg0 oxidation were concurrently achieved on the CuO/TiO2 catalyst at 250°C under a simulated NH3 selective catalytic reduction (SCR) atmosphere. NO was likely oxidized on the CuO/TiO2 catalyst to form active nitrogenous species, particularly with the aid of oxygen. The active nitrogenous species then significantly promoted Hg0 oxidation. NH3 itself did not affect Hg0 conversion on the CuO/TiO2 catalyst. The co-occurrences of NO and NH3 led to a reduction in oxidized mercury (HgO in this work), which partially offset the Hg0 oxidation and therefore resulted in a relatively lower Hg0 conversion efficiency. However, compared to flue gas without NO and NH3, the combined presence of NO and NH3 still enhanced Hg0 oxidation over the CuO/TiO2 catalyst, primarily because of the overwhelming benefit from NO. This is superior to many other SCR catalysts, including commercial vanadia-based SCR catalysts, on which an SCR atmosphere generally inhibits Hg0 conversion.

Pilot-scale evaluation of a novel TiO2-supported V2O5 catalyst for DeNOx at low temperatures at a waste incinerator

The removal of NOx by catalytic technology at low temperatures is significant for treatment of flue gas in waste incineration plants, especially at temperatures below 200°C. A novel highly active TiO2-supported vanadium oxide catalyst at low temperatures (200–250°C) has been developed for the selective catalytic reduction (SCR) de-NOx process with ammonia. The catalyst was evaluated in a pilot-scale equipment, and the results were compared with those obtained in our previous work using laboratory scale (small volume test) equipment as well as bench-scale laboratory equipment. In the present work, we have performed our experiments in pilot scale equipment using a part of effluent flue gas that was obtained from flue gas cleaning equipment in a full-scale waste incineration plant in South Korea. Based on our previous work, we have prepared a TiO2-supported V2O5 catalyst coated (with a loading of 7wt% of impregnated V2O5) on a honeycomb cordierite monolith to remove NOx from a waste incinerator flue gas at low temperatures. The NOx (nitrogen oxides) removal efficiency of the SCR catalyst bed was measured in a catalyst fixed-bed reactor (flow rate: 100m3h−1) using real exhaust gas from the waste incinerator. The experimental results showed that the V2O5/TiO2 SCR catalyst exhibited good DeNOx performance (over 98% conversion at an operating temperature of 300°C, 95% at 250°C, and 70% at 200°C), and was much better than the performance of commercial SCR catalysts (as low as 55% conversion at 250°C) under the same operating conditions.