Absence Of SO2 Research Articles

Analysis of mercury removal and sulfur resistance of CrOx-MnOx-SnOx-TiO2 catalysts

To investigate the ability of CrOx-MnOx-SnOx-TiO2 composite catalysts to adsorb and remove substances, particularly in the presence or absence of SO2, Sn was included in CrMnTi catalysts throughout the production procedure. The incorporation of Sn was found to boost the specific surface area, optimize the pore structure, and augment the number of active sites, as determined using characterization methods such as XRD, XPS, and BET. When Sn metal oxides were included in MnTi catalysts individually, the resulting MnSnTi catalysts showed a limited capacity to remove Hg0. However, adding Sn metal oxides allowed for widening the temperature range in which the catalysts found successful application. This will increase the range of application temperature and is of very successful importance for large-scale commercial applications. They demonstrate that, by incorporating chromium metal oxides, the oxygen Oβ reactivity within the MnSnTi catalyst increases, resulting in a greatly improved capacity for Hg0 removal and its resistance to sulfur. This study details the combined effect of Cr, Mn, and Sn ternary composite oxides on sulfur resistance and mercury removal. The result shows that Sn promotes the strengthening of both the physical properties of the catalyst and the adsorption of mercury while also assisting in the dispersion of the catalyst. Cr enhances the ability of the catalyst to transfer electrons while in oxidation and, at the same time, favours the remaining high valence of Mn. Mn supports the catalyst for oxidizing mercury by changing its multivalent state. The CrMnSnTi catalysts have exceptional efficacy in removing mercury and possess excellent resistance to sulfur, making them an ideal catalytic option for industrial demercury removal. The catalysts exhibited excellent efficacy in removing mercury and showed strong sulfur resistance.

Effect of processing Verdejo grape must by UHPH using non-Saccharomyces yeasts in the absence of SO2

Ultra-High Pressure Homogenization (UHPH) is an emerging non-thermal technology that can eliminate wild microorganisms from grape juice facilitating the use of non-competitive non-Saccharomyces yeast in fermentation to modulate the sensory profile.

Roles of the Comproportionation Reaction in SO2 Reduction Using Methane for the Flexible Recovery of Elemental Sulfur or Sulfides.

SO2 reduction with CH4 to produce elemental sulfur (S8) or other sulfides is typically challenging due to high energy barriers and catalyst poisoning by SO2. Herein, we report that a comproportionation reaction (CR) induced by H2S recirculating significantly accelerates the reactions, altering reaction pathways and enabling flexible adjustment of the products from S8 to sulfides. Results show that SO2 can be fully reduced to H2S at a lower temperature of 650 °C, compared to the 800 °C required for the direct reduction (DR), effectively eliminating catalyst poisoning. The kinetic rate constant is significantly improved, with CR at 650 °C exhibiting about 3-fold higher value than DR at 750 °C. Additionally, the apparent activation energy decreases from 128 to 37 kJ/mol with H2S, altering the reaction route. This CR resolves the challenges related to robust sulfur-oxygen bond activation and enhances CH4 dissociation. During the process, the well-dispersed lamellar MoS2 crystallites with Co promoters (CoMoS) act as active species. H2S facilitates the comproportionation reaction, reducing SO2 to a nascent sulfur (Sx*). Subsequently, CH4 efficiently activates CoMoS in the absence of SO2, forming H2S. This shifts the mechanism from Mars-van Krevelen (MvK) in DR to sequential Langmuir-Hinshelwood (L-H) and MvK in CR. Additionally, it mitigates sulfation poisoning through this rapid activation reaction pathway. This unique comproportionation reaction provides a novel strategy for efficient sulfur resource utilization.

Absence of SO(4) quantum criticality in Dirac semimetals at two-loop order

Absence of SO(4) quantum criticality in Dirac semimetals at two-loop order

Ce doped V-W/Ti as selective catalytic reduction catalysts for cement kiln flue gas denitration.

In cement industry, the selection of catalyst temperature window and the inhibition effect of dust composition in flue gas on catalyst are the key issues of flue gas denitrification. In this article, a pilot study with Ce doped V-W/Ti catalyst on the removal of NOx by selective catalytic reduction with ammonia (NH3-SCR) from the cement kiln flue gas was presented. Cement kiln dust loading on catalysts obviously decreased the NO conversion in the absence of SO2 and H2O, while the denitration efficiency restored from 75 to 98% at 280 ℃ after SO2 and H2O introduced into the reaction system, which mainly because the SO2 may enhance the acidic site on the catalyst surface, and prefer to be bonded with the coordinated Ca species, releasing the active sites poisoned by dust. The NH3-temperature programmed desorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS), and H2-temperature programmed reduction (H2-TPR) detections were performed to reveal that the appropriate Ce and W ratios catalyst contributed better denitrification activity. The optimum ratio of Ce doped catalyst was amplified to form the standard honeycomb monomer catalyst, and then, the activity of catalyst was verified on the side line of cement kiln. The effect of temperature and space velocity on denitrification efficiency was investigated, and the denitration efficiency reached to 92.5% at 300℃ and 3000h-1 space velocity. Moreover, the life of catalyst was verified and predicted by GM (1,1) grey model. The study realized the innovation from the laboratory data rules to the industrial pilot application, providing positive promoting value for the industrial large-scale demonstration application of the catalyst.

Variations of Washing Agent on The Physicochemical And Microbiology Properties of Sago Starch

Food is a basic necessity that must be provided in sufficient quantities, of high quality, and continuously. Utilizing the potential of natural resources, such as using locally available sago as a carbohydrate or starch source, can help alleviate the problem of food availability. Additionally, a washing procedure that produces starch could improve the caliber of the final product. The goal of the study was to identify the most effective washing agent for producing high-quality sago starch. The study’s design used a totally random approach. Chlorine, water, and metabisulphite (500, 1000, 1500, and 2000 ppm) are used in the washing process for sago starch (500, 1000, 1500, 2000 ppm). As a control, unwashed sago starch was used. According to SNI 3729:2008, the weighing and sago starch quality results showed that water was the best washing agent. The results showed a normal color, taste, and aroma as well as a moisture content of 9.92%, an ash content of 0.17%, an 87% starch content of 0.44%, an acidity level of 2.99%, the absence of SO2, Hg, and As levels, 0.7 ppm of Pb, 2.34 ppm of Cu, and a TPC value of 2.93 log cfu/g. Molds had 1.57 log cfu/g and E. coli had 0 log cfu/g.

Color Characterization of Bordeaux Red Wines Produced without Added Sulfites.

Nowadays, the development of naturalness as a concept is illustrated in the oenological field by the development of wine produced with lower inputs, sometimes even without any addition of SO2 throughout the winemaking process, up to the bottling stage. Despite the increase in the offer of these wines, they remain poorly explored in the literature and require characterization. This study was developed to evaluate the color of Bordeaux red wines without SO2 addition using colorimetric and polymeric pigments analysis. From a batch of commercial Bordeaux red wines with and without SO2 addition, and experimental wines produced from homogenous grapes according to different winemaking processes, colorimetric analyses (CIELab and color intensity (CI)) revealed a large difference in wine color depending on the presence or absence of SO2. Indeed, wines without SO2 were significantly darker and presented with a deeper purplish color. According to these observations, polymeric pigments were quantified using UPLC-DAD/ESI QTof, and a higher concentration of polymeric pigments bound by the ethylidene bridge was observed in wines without SO2. This correlated with differences observed for CIELab and CI. Finally, a comparison with polymeric tannins bound by ethylidene bridge was made and revealed that no differences were observed between wines with and without added SO2. This underlines the affinity difference between tannins and anthocyanins to react with acetaldehyde to form ethylidene bridges.

SO2 enhances aerosol formation from anthropogenic volatile organic compound ozonolysis by producing sulfur-containing compounds

Abstract. Sulfur dioxide (SO2) can affect aerosol formation in the atmosphere, but the underlying mechanisms remain unclear. Here, we investigate aerosol formation and composition from the ozonolysis of cyclooctene with and without SO2 addition in a smog chamber. Liquid chromatography equipped with high-resolution tandem mass spectrometry measurements indicates that monomer carboxylic acids and corresponding dimers with acid anhydride and aldol structures are important components in particles formed in the absence of SO2. A 9.4–12.6-times increase in particle maximum number concentration is observed in the presence of 14–192 ppb SO2. This increase is largely attributed to sulfuric acid (H2SO4) formation from the reactions of stabilized Criegee intermediates with SO2. In addition, a number of organosulfates (OSs) are detected in the presence of SO2, which are likely products formed from the heterogeneous reactions of oxygenated species with H2SO4. The molecular structures of OSs are also identified based on tandem mass spectrometry analysis. It should be noted that some of these OSs have been found in previous field studies but were classified as compounds from unknown sources or of unknown structures. The observed OSs are less volatile than their precursors and are therefore more effective contributors to particle formation and growth, partially leading to the increase in particle volume concentration under SO2-presence conditions. Our results provide an in-depth molecular-level insight into how SO2 alters particle formation and composition.

The chemical coupling between moist CO oxidation and gas-phase potassium sulfation

In the present work, the chemical coupling between moist CO oxidation and transformation of gaseous potassium salts (KCl or KOH) in the presence and absence of SO2 was investigated experimentally and through chemical kinetic modeling. The experiments were performed in a laminar flow quartz reactor at temperatures ranging from 873 to 1473 K. The experimental results showed that both KCl and KOH inhibited CO oxidation, but addition of SO2 reduced the inhibiting effect by sulfating the potassium. The degree of sulfation of KCl and KOH by SO2 was evaluated by EDX analysis of the aerosols collected downstream in a filter. Also, the consumption of SO2 and, for KCl, the formation of HCl were indications of the level of sulfation. The results indicated that KCl was only sulfated to a small degree, consistent with the observation that addition of SO2 had little effect on the inhibition of CO oxidation by KCl. Contrary to this, the captured KOH particles were fully sulfated according to the EDX results; however, most of the KOH was captured on the quartz reactor surface, forming potassium silicates.The experimental results were interpreted in terms of a chemical kinetic model. Thermodynamic data for key potassium intermediates were re-evaluated by ab initio methods and the mechanism was updated according to recent results. The modeling predictions were in qualitative agreement with the experimental results for the effect of K/Cl/S on moist CO oxidation, but the degree of sulfation was strongly overpredicted for KCl. Analysis of the calculations indicates that sulfation pathways in the model involving KOSO3 contribute to the overprediction, but both the thermodynamic properties and rate constants in the model involve significant uncertainties and more work is required to resolve the discrepancy.

Modeling the synchronous absorption and oxidation of NO and SO2 by activated peroxydisulfate in a lab-scale bubble reactor

Sulfate-radical advanced oxidation technology is emerging for environmental remediation, and current research attention has been on applications to air pollution control. This study uses a physicochemical model to investigate and compare the kinetics of NO removal alone or synchronously with SO2 by heat-activated aqueous peroxydisulfate (or persulfate). The model allowed for the validations of experimental fractional conversion data for both NO and SO2 with remarkable agreements; and predictions of reaction species and nitrogen-sulfur product concentrations, new kinetic data, and lumped-kinetic rate constants with corresponding activation energies. The model also predicted increases in mass transfer coefficients (KLa) for NO with temperature (in the range 30–90 °C) in the absence of SO2. However, in the presence of SO2, KLa values for NO are significantly enhanced (especially at the lower temperatures) compared to the case for NO-only absorption and oxidation. The results should provide useful guidance to designing cost-effective single vessels for multicomponent flue gas treatments.

Mechanism for the promotional formation of NH4+ by SO2 on different mineral dust surfaces

Ammonium is an important atmospheric particulate component that dictates many environmental processes. The promotion of the heterogeneous conversion of NH3 to NH4+ by SO2 on different mineral dust surfaces displays remarkable discrepancies, especially on MgO and α-Fe2O3 surfaces, however, the underlying mechanisms are not well known. Here, using periodic density functional theory (DFT) calculation and Born-Oppenheimer molecular dynamics (BOMD) simulation, we explored the heterogeneous adsorption of NH3 on MgO (110) and α-Fe2O3 (001) surfaces in the presence and absence of SO2. The results show that on MgO (110) surface, hydrogen-bonding interactions of NH3 on both adsorbed hydroxyl or bisulfite/bisulfate sites are observed no matter whether SO2 is present or not. While, on the α-Fe2O3 (001) surface, significant conversion of NH3 to NH4+ occurs with the coexistence of SO2, which is due to the hydrogen transfer reaction from surface HSO4 to N in NH3. The fundamental reason may be that the stronger electron affinity of Fe3+ than Mg2+ results in adsorbed bisulfate and/or bisulfite with greater acidity on α-Fe2O3 surface than MgO surface. Our results give a molecular-level explanation for the heterogeneous conversion of NH3 to NH4+ on different mineral dust surfaces under complex air pollution conditions. Considering the fact that ammonium is abundant in secondary particulates, this work would help in understanding the rapid conversion of ammonia to ammonium and in developing classification governance policies for the key precursor pollutants in China.

Acid complexation of iron controls the fate of hydrogen peroxide in model wine

At a key branchpoint in wine oxidation, hydrogen peroxide reacts either with iron(II), leading to the Fenton oxidation of ethanol, or with sulfur dioxide, precluding oxidation. The fate of H2O2 was investigated in anoxic model wines with different pH and acid buffers. In the absence of SO2, anoxic conditions allowed the stoichiometric production of acetaldehyde from H2O2 despite iron(II) being limiting, indicating efficient iron redox cycling. Acetaldehyde production was faster at pH 4.0 than at pH 3.0, attributable largely to increased iron complexation. Citrate allowed the most rapid acetaldehyde formation, while the comparative effects of tartrate and malate were pH-dependent, likely due to differences in their iron-chelating abilities. The inclusion of SO2 greatly diminished acetaldehyde formation, but did not prevent it, and reduced the differential effects of pH and acid composition. Findings overall suggest management of wine acidity can significantly affect the rate and outcome of oxidation.

Perovskite oxygen carrier with chemical memory under reversible chemical looping conditions with and without SO2 during reduction

Oxygen carrier materials (OCM) are usually exposed to sulfur-contained gases in the fuel reactor for chemical looping combustion. This work provides both experimental and model work to understand the SO2 effect on the heterogeneous redox kinetics of a CaMn0.375Ti0.5Fe0.125O3-δ-based perovskite oxygen carrier. The cycle reactivity and redox kinetics under reducing conditions were conducted with and without SO2 in a micro-fluidized bed thermogravimetric analysis technology (MFB-TGA). The redox kinetic behaviors were simulated by a bubbling fluidized bed reactor model coupled with a two-stage kinetic model. The SO2 can react with the perovskite to increase the oxygen transfer capacity from 4 wt% to 5 wt%. When the temperature is higher than 1173 K, SO2 has almost no effect on the H2 reduction reactivity, while the oxidation reactivity decreases by 50%, but the oxidation is still fast enough to achieve 4 wt% capacity within 8 s. When the temperature is lower than 1173 K, there is a significant sulfur-poisoning effect during oxidation and reduction. The analyses of XRD, SEM-EDS, and in-situ DRIFTS indicated that most of the absorbed sulfur mainly existed in the sulfate/sulfide shell on the particle surface. The chemical kinetics and physical structure of CaMn0.375Ti0.5Fe0.125O3-δ perovskite can be completely recovered in the absence of SO2, and this perovskite oxygen carrier is chemically memorable and reversible in its solid structure. The fundamental understanding of the sulfur effect on the redox kinetics and solid structure of the perovskite oxygen carrier provides a new insight to the material development and corresponding reaction mechanisms.

Effect of Microwave Maceration and SO2 Free Vinification on Volatile Composition of Red Wines.

This study evaluates the effect of microwave treatment in grape maceration at laboratory scale on the content of free and glycosidically bound varietal compounds of must and wines and on the overall aroma of wines produced with and without SO2. The volatile compounds were extracted by solid phase extraction and analyzed by gas chromatography–mass spectrometry, carrying out a sensory evaluation of wines by quantitative descriptive analysis. Microwave treatment significantly increased the free and bound fraction of most varietal compounds in the must. Wines from microwave maceration showed faster fermentation kinetics and shorter lag phase, resulting in an increase in some volatile compounds of sensory relevance. The absence of SO2 caused a decrease in concentration of some volatile compounds, mainly fatty acids and esters. The sensory assessment of wines from microwave treatment was higher than the control wine, especially in wines without SO2, which had higher scores in the “red berry” and “floral” odor attributes and a more intense aroma. This indicates that the pre-fermentative treatment of grapes with microwaves could be used to increase the wine aroma and to reduce the occurrence of SO2.

Combining experiment and density functional theory to study the mechanism of thermochemical sulfate reduction by hydrogen in supercritical water

Supercritical water gasification (SCWG) is famous for converting and utilizing sulfur-containing fuels without SOx emission. Under the hydrogen-rich reductive condition, sulfide is the prevalent inorganic existence form of sulfur with the presence of oxidative sulfurous compounds which is represented by sulfate. The transformation between sulfate and sulfide is of interest to realize regulating the final products. Thus, experimental and theoretical studies were applied in the present work to explore the unknown mechanism of thermochemical sulfate reduction (TSR) by H2. The degree of sulfate reduction by hydrogen decreases from 63 ± 5% of NaHSO4 to 24 ± 3% of Na2SO4, and 18 ± 1% of Na2SO4_K2SO4_NaOH mixture at the same reaction condition (600 °C, 25 MPa, 20 min). Sulfide, which presents in both liquid and gas phase, is the only reduction product, without any apparition of thiosulfate or SOx. Using SMD implicit continuum solvation model, the effect of supercritical water (SCW) on the reaction paths was detailed discussed in the density functional theory (DFT) calculations. The absence of SO2 in SCWG is a result of the solvation effect which guarantees the spontaneity of the consumption reaction of SO2. By comparing Gibbs free energy change and energy barrier of each reaction, the experimental results that higher sulfate reduction extent was reached under acidic condition was justified. The experimental and theoretical results are in good agreement with each other.

ALMA Observations of Io Going into and Coming out of Eclipse

Abstract We present 1 mm observations constructed from Atacama Large (sub)Millimeter Array (ALMA) data of SO2, SO, and KCl when Io went from sunlight into eclipse (2018 March 20) and vice versa (2018 September 2 and 11). There is clear evidence of volcanic plumes on March 20 and September 2. The plumes distort the line profiles, causing high-velocity (≳500 m s−1) wings and red-/blueshifted shoulders in the line profiles. During eclipse ingress, the SO2 flux density dropped exponentially, and the atmosphere re-formed in a linear fashion when reemerging in sunlight, with a “post-eclipse brightening” after ∼10 minutes. While both the in-eclipse decrease and in-sunlight increase in SO was more gradual than for SO2, the fact that SO decreased at all is evidence that self-reactions at the surface are important and fast, and that in-sunlight photolysis of SO2 is the dominant source of SO. Disk-integrated SO2 in-sunlight flux densities are ∼2–3 times higher than in eclipse, indicative of a roughly 30%–50% contribution from volcanic sources to the atmosphere. Typical column densities and temperatures are N ≈ (1.5 ± 0.3) × 1016 cm−2 and T ≈ 220–320 K both in sunlight and in eclipse, while the fractional coverage of the gas is two to three times lower in eclipse than in sunlight. The low-level SO2 emissions present during eclipse may be sourced by stealth volcanism or be evidence of a layer of noncondensible gases preventing complete collapse of the SO2 atmosphere. The melt in magma chambers at different volcanoes must differ in composition to explain the absence of SO and SO2, but simultaneous presence of KCl over Ulgen Patera.

Influence of calcination temperature on SO2 resistance of Mn‐Fe‐Sn/TiO2 catalysts at low‐temperature

AbstractThe Mn‐Fe‐Sn/TiO2(MFST) catalysts for NO and Hg co‐removal with SO2 resistance at low temperature were prepared by the impregnation method under different calcination temperatures (300, 400, 500, and 600°C). The influences of calcination temperatures on SO2 resistance and of SO2 concentration on both denitration and demercuration performances of the Mn‐Fe‐Sn/TiO2 catalysts were investigated in a fixed‐bed reaction system. Surface physicochemical characteristics and SO2 resistance mechanism of MFST catalysts were analyzed by means of Brunauer–Emmett–Teller (BET), X‐ray diffraction (XRD), H2‐temperature‐programmed reduction (H2‐TPR), and X‐ray photoelectron spectroscopy (XPS). The results showed that the NO and Hg0 removal efficiency of the MFST catalysts was not affected by reaction temperature between 200–280°C in the absence of SO2. However, the NO and Hg0 removal efficiency was affected mostly in SO2‐containing atmosphere. Appropriate calcination temperature can alleviate SO2 poisoning and improve catalytic activity. When the calcination temperature was below 500°C, MFST catalysts have good resistance to the SO2, and it was found that at calcination temperature of 400°C, the NO and Hg0 removal efficiency had the minimum decay from 95% to 70% and 99% to 93% at 700 ppm SO2, respectively, which was higher than that of other catalysts. That was mainly due to the abundant BET surface area and pore parameters and the high ratio of Mn4+/(Mn4+ + Mn3+), Fe3+/(Fe3+ + Fe2+), and Oα/(Oα + Oβ) on catalyst surface. At lower calcination temperature (≤400°C), the metal active ingredient did not calcined sufficiently that made the NO and Hg0 removal efficiency declined. While at higher calcination temperature (>400°C), the catalyst tended to agglomeration and MnO2 was converted into Mn2O3 gradually. Furthermore, doping Fe and Sn can effectively reduce the consumption of Mn4+, which greatly improved the catalytic activity and the SO2 resistance.

Sensory characterisation of Bordeaux red wines produced without added sulfites

Aim: The evolution of consumer expectations has led to the development of new production methods using low inputs. From an oenological point of view, these methods include the production of wines without any SO2 being added throughout the process. These wines are becoming very popular among consumers, but the absence of SO2 during winemaking increases the risk of stability problems. Such wines have been poorly explored in the literature and there is thus a real need for them to be characterised. This study was developed to evaluate whether Bordeaux quality wines produced without added SO2 have their own typicality, and it provides an insight into current wine production.Methods and results: From a batch of fifty-two commercial Bordeaux red wines produced without adding SO2 and twenty red wines made according to the usual winemaking methods, a selection tasting was performed to eliminate wines with at least one defect further to a sensory space evaluation. In a second phase, the Napping test was applied to defect-free wines to evaluate the sensory specificities of wines produced without SO2 addition. The wines without SO2 addition presented a much higher frequency of defects than those with SO2 (70 % vs 15 % respectively). Defects described in wines without added SO2 were: “Oxidation” (47 %), “Volatile phenols” (31 %), “Mousy off-flavor” (10 %), “Reduction” (8 %) and “Vegetable” (4 %). Since the study focused on quality wines with or without SO2 addition, it was difficult for the tasters to discriminate between them according to their overall technical pathway.Conclusion: This approach has revealed that despite the large number of “non-added SO2” wines with defects, upon blind tasting, expert tasters highlighted some “non-added SO2” wines without defects. Nevertheless, at equivalent quality levels within the same geographic region, and in non-targeted sensory tests, wines with and without SO2 addition were considered to be quite similar.Significance of the study: This study was a first sensory step toward the objective characterisation of “non-added SO2” wines, enabling further work to highlight markers of quality in wines without SO2 addition and to develop the production of “non-added SO2” wines without defects. Nevertheless, at this stage, our results show that the absence of sulfites during the whole winemaking process, including bottling, increases the risk of the development of defects.

Oxygen and SO2 Consumption of Different Enological Tannins in Relationship to Their Chemical and Electrochemical Characteristics.

The oxidative behavior of five commercial enological tannins of different sources (tea, grape marc, grape seed, untoasted oak, and toasted oak) was investigated in model wine solutions in the presence or absence of SO2. Solutions of the tannins were also analyzed for total phenolics, methyl cellulose precipitable tannins, high-performance liquid chromatography, and linear sweep voltammetry. Tea and oak-derived tannin solutions were characterized by the highest oxygen consumption rates, with oak-derived tannins exhibiting the highest oxygen consumption rates per milligram of phenolic material present. Linear sweep and derivative voltammetry parameters were well-correlated with oxygen consumption rates, whereas total phenolics or total tannins were not. All tannins were associated with consumption of SO2 upon reaction with oxygen, with the lowest rate of SO2 lost per milligram of O2 reacted being observed for oak tannins.

CuO–MoO2–CeO2 yolk–albumen–shell catalyst supported on γ-Al2O3 for denitration with resistance to SO2

Development of denitration catalysts is highly important to controlling the level of NOx pollution. In this article, we report a novel CuO–MoO2–CeO2 catalyst with a yolk–albumen–shell structure supported on commercial γ-Al2O3 for the denitration study. The yolk catalyst CuO/γ-Al2O3 was first prepared with impregnation method by loading CuO on the γ-Al2O3 support, which provides a platform for further loading MnO, Cr2O3 or MoO2 as the albumen component. While measurements confirmed CuO–MoO2/γ-Al2O3 as the best choice, the final CuO–MoO2–CeO2/γ-Al2O3 yolk–albumen–shell catalyst was formed by loading CeO2 as the shell. The denitration performance of different catalysts in the presence or absence of SO2 was studied, followed by the investigation of denitration mechanism through XRD and SEM characterizations. The investigation reveals that the denitration performance of catalysts highly depends on their structures and compositions, which could be affected in the presence of SO2. In particular, the CuO–MoO2–CeO2/γ-Al2O3 catalyst, prepared under the conditions of roasting temperature of 400 °C, roasting time of 4 h and loading of 5%, shows outstanding SO2-resistance performance while its denitration efficiency is maintained between 81 and 83%.