32results about How to "Increased geometric surface area" patented technology

A catalyst unit is described comprising a cylinder with a length C and a diameter D, wherein said unit has five holes arranged in a pentagonal pattern extending longitudinally therethrough, with five flutes running along the length of the unit, said flutes positioned equidistant adjacent holes of said pentagonal pattern. The catalyst may be used particularly in steam reforming reactors.

The invention provides a pyrolytic hard charcoal material and a preparation method and a use thereof. The pyrolytic hard charcoal material is a two dimensional plane-similar sheeting material which is formed by pyrolysing a precursor of the hard charcoal, wherein the average thickness is 1-200nm and the geometric surface area is 10-2000 square meter / g. Micropores or mesopores exist in the pyrolytic hard charcoal material. The invention further provides a method of the pyrolytic hard charcoal material. The sheet pyrolytic hard charcoal material similar to graphene in shape is extremely wide in application and can be applied to preparing a cathode material of a lithium ion battery or a sodium ion battery, an electrode material of an electrochemical capacitor, a carrier for a fuel cell and a metal air battery electrode catalyst, a composite material with great toughness effect, a toxic material absorbent, an absorbent for special use, and a decolorising agent and a gas sensitive element in food production.

A honeycomb structure includes a pillar-shaped honeycomb structure body having porous partition walls surrounding a plurality of cells which extend from a first to a second end face and which form flow channels of a fluid, and a circumferential wall enclosing the partition walls, wherein, specific cell of the cells is provided with a pair of projection which projects into the cell from the partition wall, the projection projects, in at least a pair of opposed partition walls among the partition walls constituting the cell, into the cell from a first and a second side, and which is provided continuously in a direction the cell extends, and in the case where the width of a top part of the projection is denoted by W1, and the width of a bottom part of the projection is denoted by W2, W1>W2 holds, and W2 / W1 is 0.5 to 0.9.

The invention belongs to the field of chemical synthesis processes, and particularly relates to a method for preparing n-butyl acetate from a molecular sieve immobilized catalyst. Butanol, acetic acid and water are added to an esterification reaction still according to the proportion of (2-5 L):1L:3L, the molecular sieve immobilized catalyst accounting for 5% to 30% of the total proportion of the volume of the reaction system is added, reacting is carried out for 15 min to 30 min at the temperature of 80 DEG C to 115 DEG C, then condensation is carried out, and n-butyl acetate is obtained through rectification and recovery. N-butyl acetate is prepared through the catalytic action of the molecular sieve immobilized catalyst, the acetic acid conversion rate reaches 98% or above, the yield of n-butyl acetate is 99.5% or above, and the obtained esterification product is high in purity; the molecular sieve immobilized catalyst can be reused 6-8 times, so that the production cost is greatly reduced.

A honeycomb structure includes a pillar-shaped honeycomb structure body having porous partition walls, wherein the partition walls have projecting portions,in the cells of 10% or more of the plurality of cells, the projecting portions project into the cells, a tip curvature radius R of an apex of each of the projecting portions is from 0.01 to 0.1 mm, side surfaces of the projecting portions are inclined to the surfaces of the partition walls at an inclination angle of 40 to 70°, and a relation of 0.04≤H / A≤0.4 is satisfied.

The present invention discloses a composite porous metal catalytic distillation structure component and its preparation method. Said structure component is formed from base body, modifying layer and active layer. It is characterized by that it uses the porous metal regular packing with micropore structure as base body, uses the ceramic coating layer formed after the surface of the base body is treated as modifying layer and uses the catalyst active component covering on the modifying layer as active layer. Said invented catalytic distillation structure component integrates the distillation packing and catalyst into one body so as to raise its reaction and separation effect, and is easily suitable for industrial application.

The invention relates to a silicon carbide porous ceramic filter and a manufacturing method thereof, in particular to a filter material for high-temperature liquid or gaseous fluid. The ideal silicon carbide porous ceramic filter has the advantages of gradient pore structure, low sintering temperature, high use temperature, high porosity factor, low pressure drop, large geometric surface area, zigzag flow path, high intensity, long service life, low production cost, easy regeneration and repeated use. Moreover, the filter is formed by compounding and sintering a plurality of layers of ceramicmaterials of different pore structures, and comprises a main body billet layer, a transition compound film layer and a surface compound film layer. Therefore, the filter is suitable for filtration and purification of various high-temperature and low-temperature fluids such as molten metal, high-temperature flue gas, coking gas and automobile exhaust.

The present invention relates to an anti-sulfur four-way catalyst which is provided with optimal performance and used for purifying automobile exhaust. First, a glass coating solution is prepared, then a metal alloy carrier is repeatedly immerged into the glass coating solution for coating, drying, calcinating so as to get the glass coating on the carrier, then the glass coating is repeatedly immerged into a mixed solution composed of titanium and zirconium salts and into a precious metal catalyst solution; after being baked and calcinated, the anti-sulfur four-way catalyst which is provided with optimal performance and used for purifying automobile exhaust and takes the alloy metal as a carrier is obtained. The four-way catalyst of the present invention has the following advantages that: (1) PM and NOxare catalyzed on the same catalytic bed; (2) the catalytic efficiency is not affected if the concentration of SO2 ranges from 500 to 800ppm; (3) compared with other catalysts, the catalyst has high anti-sulfur performance and takes metal as the carrier. Besides, the catalyst can ensure an engine meeting the emission of European III in a laboratory, a bench experimental testing and application to meet the requirements for emission standards above European IV.

A honeycomb structure, including: a honeycomb structure body having a porous partition walls which are disposed to define a plurality of cells and a circumferential wall, wherein the partition walls are provided with protrusions which protrude to extend into the cells and are continuously disposed in an extending direction of the cells, the cells have a polygonal shape in a cross section orthogonal to the extending direction of the cells, the plurality of cells include a plurality of specific cells having at least one place where two sides each of which is provided with a different number of protrusions intersect each other, and in the cross section orthogonal to the extending direction of the cells, disposition directions of the shapes of the cells including the protrusions in the specific cells are different in one specific cell and other specific cells other than the one specific cell.

A honeycomb structure includes a pillar-shaped honeycomb structure body having porous partition walls, wherein the partition walls have projecting portions, the projecting portions include specific projecting portions in which side surfaces have a divergent shape inclined at an inclination angle of 40 to 70°, a relation of 0.04≤H / A≤0.40 is satisfied, a relation of 0.04≤H1 / A≤0.38 is satisfied, the height H of the specific projecting portion and the height H1 of the hem satisfy a relation of H1<H, and a ratio of a total number of the specific projecting portions is 2.5% or more.

The present invention provides a honeycomb structure including a honeycomb structure portion having a partition wall partitioning a compartment; a compartment is provided with protrusions on both sides extending from a corner of the compartment; a protrusion disposed at a shorter distance from the one corner portion to the protrusion portion from a corner extending from a corner portion and located at a position closest to the corner portion as a first protrusion portion; a protrusion disposed at a longer distance from the one corner portion to the protrusion portion from a corner extending from a corner portion and located at a position closest to the corner portion as a second protrusion portion; the length of one side on which the second protrusion is provided is L, the distance from the corner portion to the bottom center position of the second protrusion is A, and the number of protrusions on the side on which the second protrusion is provided is N,the relationship of the formula(1): 1 / (N+1) < A / L is satisfied. The ratio of the total number of corners formed to satisfy the relationship of the formula (1) to the total number of corners of all the cells in the honeycomb structure portion is 2.5% or more.

The present invention relates to a catalyst for pyrolysis gasoline one-stage selective hydrogenation. Said invention utilizes the adoption of loading palladium on delta-phase alumina carrier, in which the pore volume of the carrier is 0.6-0.9 ml / g, specific surface area is 140-170 sq.m / g and the thickness of catalyst shell layer is 0.03-0.09 mm.

The catalytic distillation tower member consists of base body, modified layer and activating layer and features the base body made of regular porous ceramic stuffing, the modified layer being coating formed through surface treatment of the base body with alpha-alumina, and the activating layer comprising active catalyst component coated to the modified layer. The catalyst distillation tower member integrates the distilling stuffing and catalyst; has high efficiency, enough gas-liquid contact area, efficient mass transfer between the gas phase and the liquid phase, and excellent reaction and separation effect; and is convenient in assembling and disassembling and suitable for industrial application.