7results about How to "Enhanced Surface Acidity" patented technology

This invention relates to a volatile organic compound (VOC) adsorbent material and its preparation method. The method involves first modifying a 5A molecular sieve with lithium, followed by vanadium modification to obtain a Li-V-5A adsorbent material. Based on the total mass of the adsorbent material, the Li content is 0.8%–4.5%, and the V content is 0.2%–1%. The adsorbent material obtained by this invention, using a 5A molecular sieve as a matrix and modified to obtain the Li-V-5A adsorbent material, has advantages such as good adsorption effect on low-carbon hydrocarbons and strong resistance to sulfur poisoning, especially high adsorption and removal rate of ethane.

The invention discloses a silicon-aluminum material and a preparation method thereof. After being roasted at 500-700 DEG C, the silicon-aluminum material has the following properties: the content of silicon dioxide is 20-75wt%, and the pore volume is 0.70-1.5 mL / g; and the specific surface area is 280-400 m < 2 > / g. The preparation method of the silicon-aluminum material comprises the following steps: (1) uniformly mixing a silicon-containing compound A, an auxiliary agent A, an aluminum-containing compound and water to obtain a material flow A; (2) carrying out heat treatment on the material flow A in the presence of organic amine to obtain a material flow B; (3) uniformly mixing a silicon-containing compound B, an acidic aluminum-containing compound, an alkaline aluminum-containing compound and water, and treating to obtain a material flow C; (4) mixing the material flow C with an auxiliary agent B to obtain a material flow D; and (5) mixing the material flow B and the material flow D, carrying out hydrothermal treatment, and then washing, drying and roasting to obtain the silicon-aluminum material. The provided silicon-aluminum material shows certain molecular sieve characteristics, has the characteristics of high B acid content and stepped pore channel distribution, and is especially suitable for being used as a carrier of a hydrogenation catalyst.

The application provides a denitration catalyst, a preparation method and application thereof, and the denitration catalyst comprises a layered MCM molecular sieve carrier and a composite oxide active component loaded on the surface of the layered MCM molecular sieve carrier, and the chemical formula of the composite oxide active component is CeCuO x The denitration catalyst has high surface acidity and redox capacity, the CeCuO x The alkali metal poisoning resistance of the catalyst is improved, so that the catalyst has high catalytic activity and nitrogen selectivity in the use temperature range of 250-400 DEG C after being poisoned by alkali metal.

The invention discloses a bifunctional catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The bifunctional catalyst comprises a carrier and an active component, the carrier comprises CeO2; ceO2 has oxygen vacancy; the active component comprises Pd. The bifunctional catalyst has high reaction activity for catalyzing one-step synthesis of methyl isobutyl ketone from acetone in application, the conversion rate of acetone reaches 47%, the selectivity of methyl isobutyl ketone is 96% or above, and the bifunctional catalyst has high stability and is suitable for industrial production of one-step synthesis of methyl isobutyl ketone from acetone.

This invention relates to a VOCs adsorbent material and its preparation method. The method involves first modifying a 5A molecular sieve with lithium, and then modifying it with titanium to obtain a Li-Ti-5A adsorbent material. Based on the total mass of the adsorbent material, the Li content is 0.65%–4.2%, and the Ti content is 0.15%–0.85%. The adsorbent material obtained by this invention is a Li-Ti-5A adsorbent material obtained by modification using a 5A molecular sieve as the matrix. This material has advantages such as good adsorption effect on low-carbon hydrocarbons and good thermal stability, especially with better adsorption effect on propane.

The application discloses a low-temperature denitration catalyst and a preparation method thereof, and belongs to the technical field of flue gas denitration catalysts. 60 The catalyst is prepared by doping fullerene C 60 The pi electron system of C 60 is highly delocalized on the three-dimensional curved surface thereof, so that C 60 has excellent electron transfer capacity; and the doping proportion of C 60 can effectively promote the rapid progress of the catalytic reaction. Therefore, the catalyst prepared by the application can be applied to low-temperature flue gas denitration, can significantly improve the denitration efficiency, can widen the active temperature range of the catalyst, and can solve the problems of poor low-temperature activity, insufficient sulfur resistance and easy poisoning of traditional catalysts.

The invention relates to an oxyacid group modified transition metal oxide catalyst as well as a preparation method and application thereof. In the transition metal oxide catalyst modified by the oxyacid group, the oxyacid group is positioned on the surface of the catalyst and is in chemical bond connection with metal atoms on the surface of the catalyst; preferably, the oxysalt group is at least one of a sulfate group, a phosphate group and a phosphite group, and the transition metal oxide is at least one of manganese oxide, cerium oxide, chromic oxide and titanium oxide.