Hydrothermal Stability Research Articles

Catalytic transfer hydrogenation with methanol over Pt/C catalyst for synergistic hydrothermal hydrogenation of palmitic acid

Achieving hydrothermal hydrogenation and deoxygenation of bio-oil with high water content such as microalgae-based bio-oil still faces significant challenges. Traditional upgrading processes require a large amount of H2. The objective of current research uses methanol and formic acid as a hydrogen donor to achieve the hydrothermal hydrodeoxygenation of palmitic acid (a model of microalgae-based bio-oil) to prepare pentadecane over Pt/C catalyst without the need for additional H2 supply. The research findings have shown that the H2 supply mechanism of methanol and formic acid in synergy with palmitic acid hydrothermal hydrodeoxygenation is obviously different. Formic acid is directly decomposed to produce H2, while methanol undergoes aqueous steam reforming to produce H2 in synergy with palmitic acid hydrodeoxygenation. More importantly, methyl palmitate, a typical model compound of the first-generation biodiesel, achieved efficient deoxygenation without the addition of H2 and hydrogen donors. At 300 °C, the yield of pentadecane reached 91.25 % within 150 min. The hydrothermal stability test shows that the decrease in Pt content and specific surface area (SBET), as well as the destruction of pore structure, are the main reasons for the decrease in activity of the Pt/C catalyst after cycling. The H2 production efficiency of hydrogen donors possesses a significant impact on the hydrodeoxygenation of palmitic acid and therefore more efficient catalysts need to be developed.

Should we still be using HCl in the synthesis of SBA-15 and Al-SBA-15?

HCl is not always the best option for synthesizing SBA-15 and Al-SBA-15, and using different acids can bring beneficial structural and surface properties. While SBA-15-HCl and SBA-15-H2SO4 exhibited similar structural and textural characteristics, SBA-15-H2SO4 showed significantly lower contamination of the acid counterion in the final material, making it advantageous in catalytic applications where Cl− poisoning is a concern. On the other hand, SBA-15-HBr demonstrated a narrower pore size distribution. Notably, no residual Br− was detected in the final material for SBA-15-HBr. SBA-15-HNO3 and SBA-15-HBr displayed the highest concentration of 29Si MAS-NMR Q2 species, which can benefit grafting applications. The high degree of silica condensation in SBA-15-HCl and SBA-15-H2SO4 provides superior hydrothermal stability for these samples. From a fundamental perspective, a linear correlation was also identified between the Gibbs Free Energy of Hydration (ΔGhyd) of the anions and the SBA-15 mesopore sizes. Additionally, the study extended to preparing Al-SBA-15, and a facile methodology based on the pH-adjusting method was proposed. The samples displayed a Brønsted/Lewis ratio higher than typically reported, suggesting an efficient incorporation of Al as Brønsted acid sites.

New insights into the effects of Nd on low-temperature hydrothermal stability of deNOx Cu/SAPO-34 catalysts: A comparative evaluation of the mechanism

Designing a highly efficient and cost-effective deNOx catalyst for curbing NOx emission in diesel vehicle exhaust is highly desired but challenging. Herin, a Nd-promoted Cu/SAPO-34 (Cu/Nd-S) catalyst with superior NOx reduction efficiency and low-temperature hydrothermal stability was proposed. The NOx conversion of fresh Cu/Nd-S-F at 200 °C was improved to 86.1 % compared to fresh Cu/S-F (78.1 %). XRD and H2-TPR results revealed that Nd3+ ions filled the defect sites of zeolites and combined with P species to form NdPO4, thus stabilizing the zeolite framework and maintaining the stability of active copper species. The interaction between Nd3+ ions and Cu2+ ions protected the active copper species (Cu2+-2Z and [Cu(OH)]+-Z) from the attack of low-temperature (70 °C) moisture. However, Cu/SAPO-34 suffered from the rapid and irreversible deterioration under 70 °C of water bath, leading to the loss of surface Brønsted acid sites (Al-(OH)-Si) and isolated Cu2+ ions, so aged Cu/S-70 exhibited inferior NOx conversion. Meanwhile, in situ DRIFTS transient experiments elaborated that the NH3-SCR reaction over Cu/SAPO-34 and Cu/Nd-SAPO-34 catalysts obeyed the E-R and L-H routes simultaneously. To be noted, the Nd-doping engineering afforded a promising strategy for boosting the low-temperature hydrothermal stability of Cu/SAPO-34 catalysts for the practical application of NOx removal.

Reinforcement and reconfiguration of framework Al in P@ZSM-5 zeolite via in-situ phosphating strategy for efficient methanol-to-propylene

In this work, a "bottom-up" strategy was proposed to one-step, in-situ synthesize P@ZSM-5 zeolites in a sodium-free system by elaborately self-designed tetrapropylphosphonium hydroxide as a new member of MFI-type zeolite organic templates inventory, and the interaction of phosphorus species with framework aluminum was investigated in detail. Multiple advanced characterizations confirm that the tetrahedrally-coordinated bidentate PIV-O2-AlIV structures are precisely customized and uniformly scattered in the zeolite channels. After experiencing harsh hydrothermal treatment (100 %H2O, 800 °C, 17 h), this new structure endows excellent hydrothermal stability of zeolite (crystallinity retention beyond 95 %) and reinforces its Brønsted acidity. Furthermore, methanol-to-propylene tests show that directly synthetic P@ZSM-5 zeolite performs extraordinarily long lifetime (180 h, WHSV = 1 h−1), enviable propylene selectivity (60.4 %) and propylene/ethylene ratio (ca. 4.3) compared to the counterparts, which is benefited from encouragingly olefinic cycle pathway. These findings afford value-filled opportunities in novel catalyst production mode and understandings for phosphorus-zeolite chemistry. Synopsis-A "bottom-up" strategy was demonstrated to one-step, in-situ synthesize P@ZSM-5 zeolite in a sodium-free system by elaborately self-designed tetrapropylphosphonium hydroxide. The resultant P@ZSM-5 catalyst with hyperuniformly-stable bidentate PIV-O2-AlIV structures exhibited extraordinarily long lifetime (180 h) and enviable propylene selectivity (60.4 %).

Synthesis of Cu-SSZ-13 with different Si/Al ratios by zeolite Y conversion and its NH3-SCR activity and hydrothermal stability

Interzeolite conversion is a convenient and low-cost method to get Cu-SSZ-13 zeolite for ammonia selective catalytic reduction (NH3-SCR) of NO, but it is usually difficult to regulate the Si/Al ratio of the SSZ-13 in a wide range by interzeolite conversion. In this work, Cu-SSZ-13 catalysts with Si/Al ratios of 5, 10 and 20 were accurately synthesized by zeolite Y conversion with additional Si source. Specifically, the physical properties of Cu-SSZ-13 were characterized by XRD, SEM, ICP-AES and BET. The Al distribution and Cu2+ locations in Cu-SSZ-13 were investigated by 29Si and 27Al MAS NMR, DR UV–vis, H2-TPR and EPR. The results show that Cu-SSZ-13 with Si/Al ratio of 10 shows the considerable NH3-SCR activity and hydrothermal stability simultaneously. Moreover, different types of relationships between the reaction rate constant k and the content of α-Cu2+, β-Cu2+ species were found, indicating the diverse catalytic properties of the two active copper sites.

Low-temperature NOx reduction over Cu-LTA and SmMnOx composite catalysts

Low-temperature selective catalytic reduction of NOx with ammonia (NH3-SCR) over zeolite catalysts remains a great challenge in diesel exhaust purification. Herein, Cu-LTA zeolite with excellent hydrothermal stability was composited with a small proportion of SmMnOx oxides, the composite catalytic system efficiently resolves the low-temperature activity challenge encountered by Cu-LTA. The promoting pathways revealed the presence of active nitrite intermediates formed on SmMnOx by activating NO, that were able to migrate to the Cu-LTA and can be further decomposed on the Brønsted acid sites. Compared to the continuous deposition of nitrates in Cu-LTA, the presence of SmMnOx in composite catalysts efficiently reduced the accumulation of inert nitrate and improved the nitrate deposition phenomena. This innovative research would provide a rational strategy to break the barrier of limited low-temperature performance faced by zeolite catalysts, effectively promoting the NOx removal in vehicles sources.

Acceleration of Zeolite Crystallization: Current Status, Mechanisms, and Perspectives.

Zeolites are important classes of crystalline materials and possess well-defined channels and cages with molecular dimensions. They have been extensively employed as heterogeneous catalysts and gas adsorbents due to their relatively large specific surface areas, high pore volumes, compositional flexibility, definite acidity, and hydrothermal stability. The zeolite synthesis normally undergoes high-temperature hydrothermal treatments with a relatively long crystallization time, which exhibits low synthesis efficiency and high energy consumption. Various strategies, e.g., modulation of the synthesis gel compositions, employment of special silica/aluminum sources, addition of seeds, fluoride, hydroxyl (·OH) free radical initiators, and organic additives, regulation of the crystallization conditions, development of new approaches, etc., have been developed to overcome these obstacles. And, these achievements make prominent contributions to the topic of acceleration of the zeolite crystallization and promote the fundamental understanding of the zeolite formation mechanism. However, there is a lack of the comprehensive summary and analysis on them. Herein, we provide an overview of the recent achievements, highlight the significant progress in the past decades on the developments of novel and remarkable strategies to accelerate the crystallization of zeolites, and basically divide them into three main types, i.e., chemical methods, physical methods, and the derived new approaches. The principles/acceleration mechanisms, effectiveness, versatility, and degree of reality for the corresponding approaches are thoroughly discussed and summarized. Finally, the rational design of the prospective strategies for the fast synthesis of zeolites is commented on and envisioned. The information gathered here is expected to provide solid guidance for developing a more effective route to improve the zeolite crystallization and obtain the functional zeolite-based materials with more shortened durations and lowered cost and further promote their applications.

Enhancement of nitric oxide reduction via CeZrOx/Cu‐SSZ‐39 hybrid catalyst: Improving activity and hydrothermal stability

AbstractThis study aimed to improve the catalytic activity and hydrothermal stability of Cu‐SSZ‐39 zeolite by coupling it with cerium zirconium oxides (CeZrOx), which possesses excellent oxidizing ability, and a hybrid catalyst CeZrOx/Cu‐SSZ‐39 was prepared. It is found that it exhibited enhanced low‐temperature activity, high‐temperature activity, and a wider effective temperature range compared to Cu‐SSZ‐39. Characterization results showed that the CeZrOx/Cu‐SSZ‐39 catalyst had a higher concentration of active Cu2+ ion species and improved redox properties, which could potentially promote the NH3‐SCR reaction. Additionally, the CeZrOx/Cu‐SSZ‐39 catalyst had increased chemisorbed oxygen species on its surface, facilitating the oxidation of NO to NO2 and enhancing the rate of the SCR reaction. Moreover, even after undergoing hydrothermal aging treatment, the CeZrOx/Cu‐SSZ‐39 catalyst exhibited superior catalytic activity and improved hydrothermal stability, surpassing the performance of Cu‐SSZ‐39. It is found the CeZrOx coupling allowed the hybrid catalyst to maintain a better specific surface area and pore structure during hydrothermal aging, resulting in reduced activity loss. Therefore, the addition of CeZrOx enhanced the NH3‐SCR activity of Cu‐SSZ‐39 zeolite, leading to improved catalytic activity and hydrothermal stability. CeZrOx/Cu‐SSZ‐39 catalyst has shown promising aspect for reducing NOx emissions from diesel vehicle exhaust.

Facile one-pot synthesis of Cu-SSZ-39 catalysts with excellent catalytic performance in NH3-SCR reaction

Nitrogen oxide (NOx) emission from diesel vehicles has caused severe pollution to the atmospheric environment. Selective catalytic reduction of NOx with NH3 (NH3-SCR) technology has been widely used to remove NOx from diesel vehicle exhaust. Cu-SSZ-39 zeolites have exhibited excellent NH3-SCR catalytic activity and hydrothermal stability, giving them promise for practical application. A facile one-pot synthesis method to prepare Cu-SSZ-39 zeolites was developed, with complete crystallization achieved in 24 h. Moreover, the Cu content could be controlled by adjusting the amount of Cu-TEPA added without the need for complex post-treatment processes. Cu-SSZ-39 catalysts synthesized through the one-pot synthesis method exhibited excellent NH3-SCR activity and hydrothermal stability. The one-pot-synthesized Cu-SSZ-39 catalysts contained in situ generated CuO species, which can act as sacrificial sites to protect Cu2+ under sulfidation conditions. Considering their efficient synthesis process, excellent NH3-SCR activity, hydrothermal stability and sulfur resistance, one-pot-synthesized Cu-SSZ-39 catalysts hold great promise for future applications.

An Eco-Friendly Approach to Preserve Goatskins Using Tamarindus Indica Leaf

Hides and skins, the main raw materials for leather industries, are traditionally preserved with sodium chloride (NaCl). Due to the excessive use of salt (around 40 to 50% w/w) in the curing process, total dissolved solids (TDS), and salinity are produced in large quantities by the soaking effluent during the leather processing. To address the resulting environmental threat from the tanneries and replace traditional curing, plant-based curing is a cutting-edge green technology. In this study, Tamarindus indica leaves were used as a combination of 5% powder + 10% salt and 10% paste + 10% salt to preserve goat skin for 28 days. The organoleptic characteristics, hydrothermal stability, moisture content, nitrogen content, and bacterial load were periodically monitored. After curing, the goatskin was processed into leather, the environmental impact of the wastewater was evaluated, and its physical and fibre strength was assessed. The TDS value, chloride content, biochemical oxygen demand, and chemical oxygen demand were reduced up to 65.62%, 69.38%, 31.08%, and 27.06% respectively. The prepared shoe-upper leather exhibited equivalent physical properties compared to the control. Scanning electron microscopy (SEM) image ensured the conformity of the fibre structure of the experimental leather with control. A significant correlation was seen among the skin preservation efficiency parameters, while the strongest correlation was (r = -0.996, p<0.001) between moisture content and shrinkage temperature. Therefore, T. indica leaves powder as well as paste could be an effective curing agent by reducing the use of salt in leather industries.

Advancing highly selective low-temperature ammonia oxidation: Hydrophobic silicalite-1 shell confining silver nanoparticles on Cu/ZSM-5 core

A judiciously devised core–shell NH3-SCO catalyst featuring a Cu/ZSM-5 core enveloped by an Ag/silicalite-1 shell (Cu/ZSM-5@Ag/S-1) was rationally constructed. Integrating the silicalite-1 shell effectively suppresses the migration of Ag into Cu/ZSM-5 core, conserving the active Cu2+ sites for the catalytical conversion of byproducts NOx. Concurrently, the shell averts the formation of positively charged Ag species, facilitating the generation of abundant Ag0 nanoparticles encapsulated in the S-1 shell. Comprehensive characterizations reveal abundant Ag0 species within the core–shell Cu/ZSM-5@Ag/S-1 catalyst, boosting O2 activation and NH3 dehydrogenation and thereby contributing to superior low-temperature activity in NH3-SCO reactions. Furthermore, the hydrophobic S-1 shell effectively reinforces the hydrothermal stability of the core–shell Cu/ZSM-5@Ag/S-1. DRIFTS coupled with DFT studies elucidate that the core–shell sample follows the imide mechanism, while the shell-free sample adheres to the hydrazine mechanism. This work advances our understanding of catalyst design and presents a promising solution with practical implications for ammonia oxidation processes.

One-Pot Synthesis of Ce-SSZ-39 Zeolite with Performance in the NH3-SCR Reaction.

Cu-SSZ-39 zeolite with 8-membered rings is regarded as a very promising catalyst in the NH3-SCR reaction, but its hydrothermal stability still remains to be improved. One of the solutions to promote hydrothermal stability is the insertion of rare earth elements in the product. Nevertheless, normal ion exchange of rare earth elements limits their contents in the zeolite product due to their large hydrated ionic radius and alkaline environment under hydrothermal conditions. Herein, we for the first time present a new method for the one-pot synthesis of Ce-SSZ-39 zeolite under solvent-free conditions. The key to success is the use of Ce-FAU zeolite as a precursor. The obtained product shows good crystallinity, sheet-like morphology, large BET surface area, and 4-coordinated Al species. Detailed investigations illustrate that Ce species in the Cu/Ce-SSZ-39 zeolite micropore can prevent the dealumination and thus formation of CuAlOx species during hydrothermal aging at 850 °C for 16 h, giving the excellent hydrothermal stability and thus showing the excellent catalytic performance in the NH3-SCR reaction. One-pot synthesis of Ce-SSZ-39 zeolite with excellent catalytic performance might open a new door for developing very efficient selective catalytic reduction (SCR) catalysts in near future.

Less Is More: Selective-Atom-Removal-Derived Defective MnOx Catalyst for Efficient Propane Oxidation.

Defect manipulation in metal oxide is of great importance in boosting catalytic performance for propane oxidation. Herein, a selective atom removal strategy was developed to construct a defective manganese oxide catalyst, which involved the partial etching of a Mg dopant in MnOx. The resulting MgMnOx-H catalysts exhibited superior low-temperature catalytic activity (T50 = 185 °C, T90 = 226 °C) with a propane conversion rate of 0.29 μmol·gcat.-1·h-1 for the propane oxidation reaction, which is 4.8 times that of pristine MnOx. Meanwhile, a robust hydrothermal stability was guaranteed at 250 °C for 30 h of reaction time. The comprehensive experimental characterizations revealed that the catalytic performance improvement was closely related to the defective structures including the abundant (metal and oxygen) vacancies, distorted crystals, valence imbalance, etc., which prominently weakened the Mn-O bond and stimulated the mobility of surface lattice oxygen, leading to the elevation in the intrinsic oxidation activity. This work exemplifies the significance of defect engineering for the promotion of the oxidation ability of metal oxide, which will be valuable for the further development of efficient non-noble metal catalysts for propane oxidation.

Preparation of UiO-66 membrane through heterogeneous nucleation assisted growth strategy for efficient CO2 capture under humid conditions

Metal-organic frameworks (MOFs) have driven the development of polycrystalline membranes in the field of gas separation owing to the strong adsorption-desorption behavior and stable framework structure. However, the poor heterogeneous bonding ability between crystals and the substrate leads to the unsatisfactory gas separation as well as low stability of MOF membranes, especially in the humid environment. Herein, we prepared a thin and defect-free UiO-66 membrane by a crystal heterogeneous nucleation assisted growth strategy for efficient CO2/N2 separation. The addition of small amount of water in the precursor solution promoted the crystal nucleation process on the substrate surface. Meanwhile, the smooth PDMS interlayer guaranteed the heterogeneous well-intergrown of crystals into thin UiO-66 membranes, and provided a hydrophobic environment. Therefore, the dense UiO-66 membrane with a small thickness exhibited a high CO2 permeance (177.4 × 10−9 mol·m−2·s−1·Pa−1) with moderate CO2/N2 selectivity (24.3) under humid conditions. Furthermore, the prepared membrane demonstrated excellent renewable performance after dehumidification at high temperature, and maintained good hydrothermal stability during long-term operation under the humid environment. This work provides a new insight for the design of high-quality MOF membranes and promotes the development of MOF membranes in practical gas separation process.

A reactive neural network framework for water-loaded acidic zeolites

Under operating conditions, the dynamics of water and ions confined within protonic aluminosilicate zeolite micropores are responsible for many of their properties, including hydrothermal stability, acidity and catalytic activity. However, due to high computational cost, operando studies of acidic zeolites are currently rare and limited to specific cases and simplified models. In this work, we have developed a reactive neural network potential (NNP) attempting to cover the entire class of acidic zeolites, including the full range of experimentally relevant water concentrations and Si/Al ratios. This NNP has the potential to dramatically improve sampling, retaining the (meta)GGA DFT level accuracy, with the capacity for discovery of new chemistry, such as collective defect formation mechanisms at the zeolite surface. Furthermore, we exemplify how the NNP can be used as a basis for further extensions/improvements which include data-efficient adoption of higher-level (hybrid) references via Δ-learning and the acceleration of rare event sampling via automatic construction of collective variables. These developments represent a significant step towards accurate simulations of realistic catalysts under operando conditions.

Directional hydrothermal hydrogenation of palmitic acid to alcohol over carbon-encapsulated highly dispersed Co catalyst

The directed conversion of fatty acids into fatty alcohols in water medium has recent received increasing attention. Here, a carbon-encapsulated catalyst (Co@C) is designed and used for the hydrothermal hydrogenation of palmitic acid (a model compound of microalgae-based bio-oils) to produce 1-hexadecanol, exhibiting ultra-high catalytic activity. The yield of 1-hexadecanol is as high as 95.1 % at 200 °C within 60 min. The characterization results indicate that a large number of highly dispersed CoO nanoparticles (CoO NPs) provide sufficient hydrogenation active centers for the Co@C catalyst. More importantly, under the protection of the carbon layer, the Co@C catalyst exhibits high hydrothermal stability, far superior to the conventional supported Co/AC catalyst. The catalyst uses inexpensive glucose and cobalt nitrate as raw materials, with a simple synthesis process, low cost, and easy large-scale industrial production. This work provides a new strategy for obtaining catalysts with hydrothermal stability and activity for production of alcohols.

Modification on Interaction between P Species and Framework Al of ZSM-5 for Better Hydrothermal Stability with Hypophosphorous Precursors

Modification on Interaction between P Species and Framework Al of ZSM-5 for Better Hydrothermal Stability with Hypophosphorous Precursors

Multifunctional amphoteric heteropolymer for chromium free sustainable leather process

AbstractThe post‐tanning process of leather making involves the of large quantities of auxiliary chemicals to enhance the functionalities of the leather. Hence, developing multifunctional polymers are essential to reduce the pollution load and enhance sustainability. Herein, we report the synthesis of multifunctional retanning and fatliquoring agent using a hydroxyethyl methacrylate (HEMA) monomer by modifying the hydroxyl group to carboxyl and long‐chain hydrocarbon along with quaternary ammonium monomer. The resulting polymer has been subsequently used in the tanning and post‐tanning process. The influence of the carboxyl group increases the metal uptake of the aluminum (twofold) and zirconium (1.5‐fold) tanning agent, and hydrothermal stability of the polymer‐treated leathers is 74 and 81°C for aluminum and zirconium tanning, respectively. The experimental leather showed uniform pore size distribution and better organoleptic characteristics than the control. Introducing the quaternary ammonium group in the polymer increased dye exhaustion in the experimental process up to 97%. The anti‐bacterial studies show the polymer is effective against gram‐positive species due to electrostatic interaction. The biochemical analysis of the experiment process shows higher biodegradability (0.62). Thus, the present study opens a new avenue for a sustainable replacement for conventional post‐tanning chemicals.

An optimal combination of Na+ and H+ co-ions for high-performance Cu-impregnated *BEA zeolites: Unravelling the trade-off between the cold-start hydrocarbon trap activity and hydrothermal stability

A Cu-impregnated *BEA (denoted as BEA) type zeolite can serve as an effective hydrocarbon (HC) trap, but its long-term hydrothermal stability should be improved for real uses. However, designing robust high-performance HC traps, which is closely related to the confined environment that accommodates active Cu species and strengthens the zeolite structure, remains elusive. In this study, to the best of our knowledge, we, for the first time, systematically varied the Na content in the BEA zeolite prior to Cu impregnation. Intriguingly, we found a trade-off between the cold-start test (CST) activity (a simplified trap test for simulated HC emissions) and hydrothermal stability of the Cu-impregnated BEA zeolites. Specifically, increasing Na content decreased the CST performance monotonically, whereas it increased the hydrothermal stability. The decreased CST performance could be attributed to the less formation of the active Cu species (both Cu cations inside for preferred HC adsorption and CuO particles outside for facile HC oxidation). In addition, the improved hydrothermal stability benefited from dual features: Na+ ions could alleviate the zeolite structural collapse/damage during hydrothermal treatment (HT) at 800 °C by reducing the amount of most easily hydrolyzed Si-O(H)-Al bonds and avoid the formation of large CuO particles, which are known to destroy the zeolite structure during HT. As a net, we revealed that the Cu-impregnated BEA zeolite with an optimal Na/Al ratio of ca. 0.7 was key to achieving marked CST efficiencies in the HT state (22 %) in contrast to the H-form-based counterpart that exhibited extremely poor performance (i.e., nil).

Promoted catalytic property of Cu/SSZ-13 by introducing a minority of Mn for NO removal from diesel engine exhaust

The Cu-exchanged SSZ-13 with the small-pore chabazite framework is considered as a highly efficient catalyst for selective catalytic reduction of NO with NH3 (NH3-SCR). In order to further improve the catalytic property, a series of Mn ion-assisted Cu/SSZ-13 powder catalysts were prepared by co-exchange method and stepwise exchange method. It is found that the NH3-SCR activity, N2 selectivity, hydrothermal stability and sulfur resistance of Cu/SSZ-13 are promoted by introducing a minority of Mn (0.15%–0.23%(mass)) through co-exchange method. Characterization results revel that the Cu,Mn co-exchange enables the higher amounts of Cu2+ active sites, the abundant medium strong and strong acid, the optimized ratio of lewis acid to Brønsted acid, etc., which are required for a good NH3-SCR catalytic property over broad temperature range and under harsh working environment. Moreover, a monolithic catalyst was prepared by impregnating a cordierite ceramic support into the coating slurry containing the optimized CuMn/SSZ-13 powder. The diesel engine bench tests show that Cu,Mn co-exchange gives the monolith catalyst a better catalytic property than commercial catalysts. This work provides an important guidance for the rational design of secondary-ion-assisted zeolites applied in NH3-SCR.