Catalytic Filter Research Articles

In situ decorated Mn-FeOx amorphous oxides on filter felt by a polyphenol-assisted method for low-temperature NH3-SCR

The combination of dust filtration technology and selective catalytic reduction of nitrogen oxides can effectively reduce the energy consumption and footprint of the flue gas purification system. To fabricate the high efficiency and firmly bonded catalytic filter material, a novel polyphenol-assisted method was designed in this work for in situ decorating Mn-FeOx amorphous oxides onto the smooth polyphenylene sulfide (PPS) filter felt. The polyphenolic compounds are not only worked as the dispersant, but also the binder for Mn-FeOx catalysts to firmly anchor on PPS filter felts. The introduction of Fe3+ into catalyst precursors can increase the Mn4+ content, surface adsorbed oxygen, as well as surface acidity, which displays satisfactory denitration performance and SO2 tolerance at low temperatures. The Mn5Fe1-TA/PDA@PPS sample shows nearly 100 % NO conversion efficiency at 180 °C with only 10.11 % catalysts loading in the sulfur dioxide free flue gas. Furthermore, the green and efficient synthesis route makes the catalytic filter felts preserve the same gas permeability and thermal stability with the pristine PPS filter felt, which suggests that the Mn5Fe1-TA/PDA@PPS has great prospects for simultaneously removing of NOx and dust in practical applications.

Atomically dispersed Fe-N5 sites with optimized electronic structure for sustainable wastewater purification via efficient Fenton-like catalysis

Herein, a single-atom catalyst (SAC) featuring Fe-N5 sites (FeNC) with optimized electronic structures was constructed and applied to activate peroxymonosulfate (PMS) for wastewater purification. The high-coordinated Fe-N5 sites was obtained by creating a high-nitrogen gas environment around fully exposed Fe atomic sites on chitosan surface during pyrolysis. The FeNC/PMS system demonstrated excellent decontamination capability, superior anti-pH interference ability, while also exceptional durability in a continuous-flow catalytic filtration reactor. Experiments and density functional theory calculations unveiled that Fe-N5 site was the active center. Meaningfully, neighboring carbonyl groups narrowed the gap between d-band center of Fe 3d and Fermi level, which increased the adsorption energy of PMS on Fe-N5 sites, thus lowering the energy barrier for singlet oxygen generation. This study brings a vivid electronic structure optimization strategy for enhancing the catalytic activity of Fe SAC as well as guiding the selection of desirable catalysts for wastewater purification by Fenton-like chemistry.

Hydrogen peroxide enhancing the process of MnO2-modified ceramic membrane catalyzing micro-nano bubble

In this study, MnO2-modified ceramic membranes (MnO2@CMs) with different morphologies were prepared via hydrothermal method. The concentration of K+ and H+ in the solution determined the morphological evolution of the MnO2 on the CM. We then structured a H2O2/MNB/MnO2@CM system through adding H2O2 to the system of MnO2@CM coupling MNB. The performance analysis of the MnO2 catalyst, including loading, pH zero point charge, crystalline phase, and Mn(Ⅲ) content, determined that the sheet-like MnO2@CM was the most effective for removing pollutants in the H2O2/MNB/MnO2@CM system, achieving 99.45% decolorization and 73.07% TOC removal of methylene blue (model pollutant). The durability of the system was also confirmed through tests on membrane water flux, reuse, and manganese leaching. Mechanism analysis revealed that H2O2 could induce MNBs to generate reactive oxygen species (ROS) in the solution through reaction or hydrolyzing H+, which acted as a pretreatment for MnO2@CM catalytic filtration. In addition, a Fenton-like reaction was also formed on the surface of the MnO2@CM. These reactions greatly enhanced the process of MnO2@CM catalyzing MNB and its efficiency for removing pollutants. This work provides important insights for designing more efficient catalytic CMs and developing novel processes for wastewater treatment.

Optimization and Techno-Economic analysis of catalytic gasification of wheat straw biomass using ASPEN PLUS model

Biomass gasification efficiently produces heat, electricity, and power. However, removing harmful contaminants from raw syngas is crucial. Tar production is a challenge due to blockage, plugging, and corrosion. Tar steam reforming (TSR) is the most promising technique, converting high molecular weight hydrocarbons into CO, CO2, H2, and CH4. In this study, a model of biomass gasification using wheat straw as biomass feedstock has been developed using Aspen Plus. The gasification flow sheet encompasses gasification, catalytic filter candle, gas cleaning, impurity removal reactor, separator, and subsequent sorbent reactors. Ni-based catalysts with Ni ratios (5%, 10%, and 15%) are used to simulate TSR reactions. Results show that the 15% Ni-Co-Al2O3 catalyst outperforms the 10% and 5% Ni-Co-Al2O3 catalysts. This study explores the impact of temperature, catalyst loadings, and steam-to-carbon (S/C) ratios on toluene conversion and hydrogen yield in catalytic steam reforming, along with temperature, steam-to-biomass ratios, and equivalence ratio on syngas fraction in gasification. It includes a techno-economic analysis of wheat straw gasification to improve syngas energy through efficient tar conversion.

Coal-based catalytic carbon membrane functionalized with nitrogen-doped carbon nanospheres for efficient bisphenol a removal

Catalytic membrane process, which combines membrane filtration and advanced oxidation, has promising application prospects in water decontamination. In this work, a novel metal-free coal-based catalytic carbon membrane (PPy/CCM-800) was developed and applied for the typical EDC-bisphenol A (BPA) removal from water via activating peroxymonosulfate (PMS). Morphology investigation manifested that the N-doped carbon nanospheres derived from the pyrolytic PPy particles distributed evenly on the surface of coal-based carbon membrane (CCM). In contrast to bare CCM, catalytic performance of PPy/CCM-800 was significantly enhanced by the anchoring of N-doped carbon nanospheres, and 97.89 % of BPA and 60.83 % of total organic carbon (TOC) can be removed by PPy/CCM-800 during catalytic filtration treatment. Catalytic mechanism investigations confirmed that the excellent decontamination performance of PPy/CCM-800 was attributed to the synergistic effects of radical and non-radical oxidation pathway, and the non-radical pathway (1O2 and direct electron transfer) played the dominant role. Moreover, the possible BPA degradation pathways were proposed based on the density functional theory (DFT) calculations and HPLC-MS results.

MnO2@CS modified catalytic membrane for simultaneous organics removal and membrane fouling mitigation via peroxymonosulfate activation

The integration of advanced oxidation process and ultrafiltration membrane has been regarded as an effective method to improve pollutants removal and mitigate membrane fouling simultaneously in the field of wastewater treatment. Hence, a novel catalytic membrane microreactor, referred to as MnO2@CS-UF, was synthesized via coupling MnO2 modified carbon spheres (MnO2@CS) with membrane. The mesoporous structure of MnO2@CS guaranteed adequate water transfer channels and also contributed to more exposure of active sites. With MnO2@CS uniformly dispersed, the MnO2@CS-UF membrane showed increased hydrophilicity, higher permeability and superior peroxymonosulfate (PMS)-activation capability. With synergistic effect of pore interception and catalytic degradation, MnO2@CS-UF showed excellent organic pollutants removal (MB removal of about 100 % in 5 min), and had a prominent mitigation effect on membrane fouling caused by model NOM. In addition, MnO2@CS-UF/PMS system showed excellent catalytic filtration performance in the treatment of actual secondary effluent (SE). MnO2@CS-UF/PMS system could effectively remove fluorescent organics, and the removal rates of I-V region were 36.3 %, 72.3 %, 67.7 %, 73.5 % and 71.4 %, respectively. The permeance decline of MnO2@CS-UF was also effectively alleviated, with irreversible and reversible resistances reduced by 61.0 % and 23.2 % than UF membranes, individually. High-valent manganese-oxo species and singlet oxygen played a leading role in contaminants elimination, whereas radical oxidation acted as auxiliary contributors. Standard blocking became the dominant fouling pattern for MnO2@CS-UF/PMS, demonstrating that the MnO2@CS catalytic layer ensured the synthesis of vast active substances, prevented foulant adhesion on pore walls and alleviated the growth of cake layer. These results illustrated that the integration of MnO2@CS catalytic degradation and membrane filtration was feasible to improve the permeate quality and mitigate membrane fouling in wastewater reclamation.

Revealing the reaction regularity of Mn-CeO2-x catalyst system in catalytic filter for low-temperature NH3-SCR

A series of manganese-cerium-based (MnO2-CeO2-x) polyphenylene sulfide (PPS) catalytic filters were prepared via a redox method to enhance catalytic activity and physico-chemical performances. The oxidation regularity of the cerous ion (Ce3+) was revealed through controlling KMnO4 content, based on which a Mn-Ce catalyst system and its corresponding redox equation were established. Furthermore, the preparation of the optimal catalytic filter achieved satisfactory catalytic performance compared with the previous catalytic filters (NO conversion of 93.5 % at 180 °C under low load conditions). This catalytic filter also exhibits excellent catalyst stability, gas permeability, bonding strength, and mechanical properties, making it suitable for complex operating conditions. Particularly, the coexistence of CeO2 and Ce2O3 in the catalyst system leads to an imbalance in surface charge, oxygen vacancies, and unsaturated chemical bonds on the surface of the catalyst, thereby increasing the amount of chemisorbed oxygen, promoting NO oxidation, and further improving selective catalytic reduction of NOx with NH3 (NH3-SCR).

Evaluation of a novel nickel ceramic filter prepared by urea precipitation method for removal of tars from biomass syngas using naphthalene as tar model compound

Gasification has been shown to be an effective thermal conversion process for waste biomass in order to create fuel, specialty chemicals, and hydrogen. Gasification is likely to take on a major role in the near future in the burgeoning hydrogen economy. In order to improve the commercial viability of gasification, catalytic tar reforming has come to the forefront as one of the most promising methods of reducing the tar content that has been detrimental to downstream equipment in the process. The use of catalytic ceramic filters has presented promising potential for this application that can serve dual role of tar and particulate removal. In this study, a nickel-based ceramic filter has been prepared using urea vacuum impregnation technique and evaluated for tar removal efficiencies. The urea technique was more effective than traditional impregnation techniques at uniformly dispersing nickel across the surface of the ceramic filter, driving the nickel particles to penetrate the pores of the support, thus aiding in improved tar removal capabilities. Through steam reforming studies using a naphthalene simulant tar molecule, the 15 wt% nickel filter was able to reduce the naphthalene content by 97% at temperature of 750 °C over 2 h. An activation energy of 126.4 kJmol was achieved for steam reforming using the urea vacuum impregnated catalytic filter compared to 136.4 kJmol using the incipient wetness impregnated filter.

The simultaneous elimination of NOx and VOCs over industrial V-based catalytic filter: Reaction behaviors and catalyst structural evolutions

The effective elimination of multiple pollutants (e.g., SOx, NOx, VOCs, dusts) in a simple unit is a long-term goal in the field of flue gas purification. In this work, the simultaneous removal of NOx and toluene was explored over the industrial V2O5-MoO3/TiO2 catalytic filter. The catalytic evaluations show that two reactions may share the same type of active sites, and observed adverse interaction effects at low temperatures, which significantly weakened as the temperature increased. Water vapor plays an amazing role with almost 100% removal efficiency of both NOx and VOCs for long-term test under harsh conditions at 350 ℃. Multiple structural characterizations confirmed the great structure stability. Especially, the catalyst components can be sulfated by SO2 and become more dispersed and uniform owing to the formation of solid solution phase, which further improves the removal performance. Moreover, the mechanism over the dynamically balanced V5+/4+/3+-SO3/42- sites was proposed, and the main reaction pathway of toluene oxidation follows the route of benzaldehyde → benzoic acid → maleic anhydride → CO2. Particularly, the In-situ DFIRTS results further confirm the above reaction/interaction effects and sulfur/steam-resistance mechanisms during the simultaneous removal of both NOx and VOCs. The excellent sulfur/steam-resistance performance and special structure features of the industrial V-based catalytic filter foreshadow the promising industrial application prospect for the effective purification of flue gas containing VOCs.

High-Efficiency Cycling Piezo-Degradation of Organic Pollutants and the Piezocatalysis–Adsorption Duality of MoS2 Nanoflowers

This study realized the large-scale piezo-catalytic RhB dye degradation by forming a catalytic filter of 2H phase MoS2 and carbon cloth. Over 2.5 liters of the organic pollutant can be fully decomposed through the application of a water pumping system. The results obtained indicate that 2H MoS2 NFs were highly reusable and have excellent potential for the application in industrial wastewater treatment. Furthermore, this study theoretically and experimentally investigates the piezocatalytic and adsorption effects of different phases of polymorphic MoS2 NFs. By adjusting the electrostatic surface charge of these NFs and the RhB solution, different crystalline phases of MoS2 NFs would result in either adsorption or piezo-catalytic effects toward the organic dye. The results evident that the cationic dye is adsorbed on the surfaces of the 1T MoS2 NFs; however, the few-layer 2H MoS2 NFs generate a considerable quantity of hydroxyl species for degrading RhB molecules through the mechanical-force-induced piezo-potential. Figure 1

Porous mullite ceramics with hierarchical pores constructed via vat photopolymerization of multi-phase Pickering emulsion

Herein, a novel method for hierarchically porous mullite ceramics with complex and fine structure was proposed, that is vat photopolymerization of multi-phase Pickering emulsion. Pickering emulsions stabilized by mixed particles features water in oil type, high solid content, suitable rheological properties and excellent ultraviolet-curing ability, making them appropriate pastes for vat photopolymerization. The printed components possess hierarchically porous structure involving interconnected mm-scale pores designed by three-dimensional model, uniform μm-scale pores derived from emulsion droplets and less voids generated by the removal of photosensitive resin in the location of continuous phase. Therefore, porous mullite ceramics with octet lattice structure possess excellent compressive strength up to 4.3 MPa at high porosity of 74.08% compared to the counterparts from pure resin-based suspension. The products from this facile, universal and effective method could serve as ideal candidates for catalytic filters, biological scaffolds and electronic components owing to their designable structure and outstanding multifunctionality.

Chalcopyrite functionalized ceramic membrane for micropollutants removal and membrane fouling control via peroxymonosulfate activation: The synergy of nanoconfinement effect and interface interaction

This work developed a novel chalcopyrite (CuFeS2) incorporated catalytic ceramic membrane (CFSCM), and comprehensively evaluated the oxidation-filtration efficiency and mechanism of CFSCM/peroxymonosulfate (PMS) for organics removal and membrane fouling mitigation. Results showed that PMS activation was more efficient in the confined membrane pore structure. The CFSCM50/PMS filtration achieved almost complete removal of 4-Hydroxybenzoic acid (4-HBA) under the following conditions: pH = 6.0, CPMS = 0.5 mM, and C4-HBA = 10 mg/L. Meanwhile, the membrane showed good stability after multiple uses. During the reaction, SO4•− and •OH were generated in the CFSCM50/PMS system, and SO4•− was considered to be the dominant reactive species for pollutant removal. The roles of copper, iron, and sulfur species, as well as the possible catalytic mechanism were also clarified. Besides, the CFSCM50/PMS catalytic filtration exhibited excellent antifouling properties against NOM with reduced reversible and irreversible fouling resistances. The Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory analysis showed an increased in repulsive energy at the membrane-foulant interface in the CFSCM50/PMS system. Membrane fouling model analysis indicated that standard blocking was the dominant fouling pattern for CFSCM50/PMS filtration. Overall, this work demonstrates an efficient catalytic filtration process for foulants removal and outlines the synergy of catalytic oxidation and interface interaction.

Sustainable Hierarchically Porous Reusable Metal–Organic Framework Sponge as a Heterogeneous Catalyst and Catalytic Filter for Degradation of Organic Dyes

Advanced oxidation processes based on sulfate radical are considered one of the most promising wastewater treatment technologies currently. Among heterogeneous catalysts, cobalt metal–organic framework (MOF) has been widely reported. However, the inherent powder form of MOF hinders its practical application and reusability. Therefore, innovative methods to increase the loading capacity and the accessibility of MOF active sites in monolithic materials are required. Therefore, a simple and scalable method of fabricating a stable, hierarchical porous zeolitic imidazolate framework (ZIF‐67) 3D sponge by growing MOF on a short electrospun fiber network is shown. The sponge can efficiently activate peroxymonosulfate and rapidly degrade an exemplary organic dye (Rhodamine B) with a degradation efficiency of 100%. The resulting multilevel, hierarchical porous structure is beneficial to the mass transfer of reagents making the catalytic process efficient. This also enables the use of the ZIF‐67 as an efficient catalytic filter for continuous removal of dye. The sponge can be recycled and reused for several cycles due to its robustness without loss in efficiency. The proposed research strategy provides a new way to design MOF 3D monolithic materials.

Wood-based catalytic filter decorated with ZIF-67 for highly efficient and continuous organic pollutant removal

High-performance catalytic filters with both high removal efficiency and high water flux are essentially demanded for organic wastewater purification but still remain a great challenge. Herein, taking full advantage of the well-aligned liquid transport channels of natural wood and the excellent catalytic activity of metal–organic frameworks (MOFs), we developed a high-efficiency wood-based catalytic filter (ZIF-67@wood) for continuous and highly efficient catalytic degradation of methylene blue (MB) in water. The wood scaffold was pretreated with a sodium hydroxide (NaOH) solution to create nucleation sites for in situ growth of ZIF-67 nanocrystals within the wood channels, which function as catalytic sites to activate peroxymonosulfate (PMS) to generate reactive radicals (·OH and SO4•−) for MB degradation. As the MB solution flows through the catalytic filter, the abundant well-distributed vessel channels of natural wood serve as the primary pathways for rapid fluid transport and enhance the contact between organic contaminants and ZIF-67 nanocrystals. The obtained ZIF-67@wood catalytic filter demonstrated a high MB removal efficiency (∼90 %) with a water flux rate of 5119 L m−2h−1 under gravity-driven conditions, outperforming most previously reported MOF-based composites. Moreover, multiple ZIF-67@wood catalytic filters can be readily integrated and assembled as a flow-through catalytic reactor for continuous MB degradation. Such cost-effective, highly efficient, and scalable wood-based catalytic filters hold great promise for practical wastewater treatment.

Low-temperature catalytic oxidation of PCDD/Fs over MnCeCoOx/PPS catalytic filter.

Catalytic destruction of nitrogen oxides (NOx) combined with dust removal technique has attracted much attention, yet the application in the solid waste incineration air pollution control process is still lacking due to the complex flue gas atmosphere. In this work, the Mn-Ce-Co-Ox catalyst-coated polyphenylene sulfide (PPS) filter fiber with efficient dust removal and low-temperature polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) destruction has been prepared with a redox-precipitation method. The catalyst was uniformly grown around the PPS fiber with appropriate catalyst loading. The effects of several key operating parameters (e.g., reaction temperature, catalyst loading amount, and filtration velocity) on the catalytic efficiency were comprehensively investigated. The results show that the Mn-Ce-Co-Ox/PPS has a decomposition yield of 78.0% in PCDD/Fs and 96% in nitric oxide (NO) conversion at 200 °C. The poisoned catalytic filter exhibits a removal efficiency of 88.6% for PCDD/Fs. In addition, the catalytic filter can completely reject particles smaller than 1.0 μm with a low filtration resistance. Therefore, this efficient and energy-conserving catalytic filter shows promising applications in flue gas pollution treatments.

Simultaneous catalytic removal of NO and chlorobenzene over Mn–Ce-Sm-Sn-Ox/P84 composite catalytic filter

The integration of surface filtration and catalytic decomposition functions in catalytic bags enables the synergistic removal of multiple pollutants (such as dust, nitrogen oxide, acid gases, and dioxins) in a single reactor, thus effectively reducing the cost and operational difficulties associated with flue gas treatment. In this study, Mn–Ce-Sm-Sn (MCSS) catalysts were prepared and loaded onto high-temperature resistant polyimide (P84) filter through ultrasonic impregnation to create composite catalytic filter. The results demonstrate that the NO conversion rates of the composite catalytic filter consistently achieve above 95 % within the temperature range of 160–260 °C, with a chlorobenzene T90 value of 230 °C. The ultrasonic impregnation method effectively loaded the catalyst onto the filter, ensuring high dispersion both on the surface and inside the filter. This increased exposure of catalyst active sites enhances the catalytic activity of the composite catalytic filter. Additionally, increasing the catalyst loading leads to a gradual decrease in permeability, an increase in pressure drops and the long residence time of the flue gas, thereby improving catalytic activity. Compared to ordinary impregnation methods, ultrasonic impregnation improves the bonding strength between the catalyst and filter, as well as the permeability of the composite catalytic filter under the same loading conditions. Overall, this study presents a novel approach to prepare composite catalytic filter for the simultaneous removal of NO and chlorobenzene at low temperatures.

A novel catalytic filtration process using MnO2@sand and peroxymonosulfate for unselective removal of organic contaminants from water

Multiple catalytic oxidation processes involving new synthesized materials have recently been examined to replace conventional oxidative treatment methods for water purification, but upscaling and demonstration stages are mostly lacking, which hinders their practical implementation. In this study, we introduce a novel catalytic process where peroxymonosulfate (PMS) is activated by MnO2 surfaces that are attached on natural sand as part of a catalytic filtration column (CFC). PMS decomposition in the CFC was stable during steady-state filter operation with different natural waters (tap water and secondary effluent) and sulfate radicals were identified as main radical species. Complete oxidation (>99 %) of 10 mg/L rhodamine B in tap water could be achieved with PMS concentrations as low as 0.2 mM and a residence time of less than 3 min. Furthermore, unselective oxidation of various recalcitrant and environmentally-relevant trace organic chemicals (e.g., carbamazepine, sulfamethoxazole, and benzotriazole) was achieved with 0.6 mM PMS in tap water and secondary effluent, proving the robustness of the process in presence of multiple organic and inorganic constituents. Future investigations are needed to optimize the CFC process for specific applications and confirm its operation in real-world water matrices and to study sustainability aspects. Overall, this study demonstrates the potential of the CFC process to be implemented as a practical nano-enabled water treatment and offers a framework for next steps to be taken before upscaling. It provides important performance data that can be used as reference for future proposals of scalable catalytic oxidation water treatment technology.

Particle accumulation model in 3D reconstructed wall of a catalytic filter validated with time-resolved X-ray tomography

A transient pore-scale model of particle deposit formation in 3D microstructure of a catalytic filter wall is introduced. It predicts location of particle deposits, dynamics of their growth, transition from deep to cake filtration regime as well as the impact on flow field, pressure drop and filtration efficiency. The model is validated against time-resolved X-ray tomography (XRT) data acquired during a filtration experiment. The validated model is then used in transient simulations of the soot filtration process in several different microstructures using cordierite filter substrate with varied Pd/γ-Al2O3 catalyst distribution. The sample with the coating solely inside the wall pores provides the lowest initial pressure drop but suffers from low clean filtration efficiency and high pressure drop after the cake is formed. The sample with partial on-wall coating achieves not only a higher filtration efficiency but also a lower pressure drop in long-term operation.

Effect of additives on sulfur resistance of catalytic filter material during denitrification and synergistic decomposition of 1,2-DCBz.

Modified Mn-Ce/P84 catalytic filter material can be used to achieve high removal efficiency of NOx and 1,2-DCBz in bag-filtering dust precipitator synergistic removal of multiple pollutants. However, the presence of SO2 in the actual industrial flue gas has an adverse impact on the catalytic performance of the catalytic filter material. In this paper, a kind of Mn-Ce catalytic filter material was prepared by the impregnation method, which was modified by Fe, Cu, and Co, respectively. As a result, the sulfur resistance of the catalytic filter material was improved. The change of catalytic activity of the three kinds of modified catalytic filter material at different concentrations was compared in the SO2 flue gas fixed bed system. And the modified catalytic filter materials were characterized by SEM, BET, XPS, XRD, and H2-TPR. When the temperature was over 80 °C, different concentrations of SO2 were injected into the simulated flue gas to test the denitrification activity of the catalytic filter material. The results showed that under the low SO2 concentration of 150 ppm, the denitrification activity and 1,2-DCBz activity of Fe, Co, and Cu-modified filter material were increased, and the sulfur resistance of Fe was better under the flue gas conditions of 300 ppm and 450 ppm SO2. Under the condition of 450 ppm SO2 and 200 °C reaction, 93.4% denitrification efficiency and 96.1% 1,2-DCBz removal efficiency could be achieved by using modified Fe-Mn-Ce catalytic filter material.

Comprehensive Chemical Cleaning of Flue Gases of Thermal Waste Treatment Plants Using a Catalytic Filter

The efficiency of integrated gas emissions treatment in thermal waste treatment units from dust particles and fossil sour traces of SO2, HCl and HF, as well as volatile organic compounds (VOCs) and dioxins at 300–400 °C of the gas mixture with a ceramic gas filter with aluminosilicate fibers added with catalytic MgCr2O4. The efficiency of sorption purification of tail gases from SO2, HCl and HF during the test period was 79–90 %, which depended on the supply of slaked lime to the catalytic filter to prevent catalyst deactivation. Thermal mode of chemical refining (300–400 °C) provided effective catalytic purification from VOCs, CO, and dioxins in combination with the chemisorption recapture of catalytic poisons and dust, preventing neither sorbent degradation nor damage to the catalyst.