H-MOR

Product Name H-MOR Product Overview The MOR molecular sieve possesses a MOR-type skeletal topology in the orthorhombic crystal system, with main pores consisting of cylindrical channels formed by twelve-membered rings. These main channels are interconnected by irregular eight-membered ring channels, through which reactant molecules generally cannot diffuse. Technical Parameter Appearance:White powder Aperture:0.5-0.6nm Specific surface area:450m2/g Particle size:0.2-1μm(SEM) Silica alumina ratio:20-40(XRF) Product Features The precise spatial confinement effect and exceptional shape-selective catalytic capability represent the most prominent advantages of H-MOR. Its framework consists of a one-dimensional pore system comprising a main channel with a 12-membered ring (12-MR; approximately 6.7 Å × 7.0 Å) and side pockets formed by 8-membered rings (8-MR; approximately 2.6 Å × 5.7 Å), enabling stringent selection of the size and shape of reactants, transition states, and products. The quantifiable and tunable nature of acidic sites provides a foundation for rational catalyst design. While traditional methods struggle to differentiate the contributions of basic active sites (BAS) within different pores, recent studies have successfully achieved quantitative mapping of intrinsic acidic sites in H-MOR by combining high-field ²³Na multi-quantum magic-angle rotation nuclear magnetic resonance (MQ MAS NMR) with density functional theory (DFT) calculations, providing an atomic-level tool for understanding structure-activity relationships. Furthermore, the intensity, density, and spatial distribution of BAS can be effectively modulated through ion exchange (e.g., Cu²⁺, Co²⁺) or post-treatment processes (e.g., aluminum removal, alkaline treatment), thereby optimizing catalytic performance. Application Fields Carbonylation of dimethyl ether (DME) to methyl acetate (MA): This is a critical step in the synthesis route for ethanol from syngas. H-MOR exhibits the highest yield and selectivity for methyl acetate in this reaction due to its unique acidic sites within the octa-membered ring channel. By precisely modifying these acidic sites, researchers can significantly enhance reaction activity—sometimes even doubling it. Furthermore, modification with compounds such as pyrazole salts can protect the active centers in the twelve-membered ring from carbon deposition, thereby effectively extending catalyst lifespan. Aromatic alkylation and alkyl transfer: In the alkylation reaction between toluene and isopropanol, H-MOR serves as the fundamental catalyst. Modification with elements such as lanthanum (La) enables adjustment of pore size and acidity, enhances selectivity for para-products, and improves resistance to carbon deposition. Similarly, in the alkyl transfer reaction between toluene and 1,2,4-trixylene, H-MOR catalysts with small particle sizes demonstrate superior catalytic performance. Catalytic combustion of VOCs (environmental remediation): H-MOR serves as an excellent catalyst support for treating volatile organic pollutants. For instance, palladium (Pd)-H-MOR exhibits outstanding apparent activity in the combustion of low-concentration methane, while chromium (Cr)-loaded H-MOR achieves a 90% conversion rate for trichloroethylene under mild conditions of approximately 309°C with good stability. Photocatalytic degradation of antibiotics: H-MOR itself possesses a broad bandgap of about 3.74 eV and demonstrates photocatalytic activity under ultraviolet light. Studies have confirmed that its photocatalytic efficiency in degrading tetracycline in water surpasses that of H-ZSM-5 and H-β molecular sieves, making it an ideal template for constructing photocatalytic heterojunctions. Permeation vaporization membrane separation: H-MOR membranes prepared via ion exchange demonstrate superior performance in separating acetate/water mixtures, combining excellent hydrophilicity and acid resistance with ideal permeation flux and separation factors, thereby offering a viable alternative to traditional energy-intensive distillation processes.