135 results about "Porosimetry" patented technology

A catalyst that enables to produce ethylene oxide in a high selectivity and a method for the production of ethylene oxide using the catalyst are provided. In the catalyst for the production of ethylene oxide, wherein the catalyst component is supported by a carrier, a carrier containing α-alumina as the main component which has at least two peaks in the range of pore diameter of 0.01-100 μm and at least one peak of the above peaks is present in the range of pore diameter of 0.01-1.0 μm in the pore distribution measured by mercury porosimetry is adopted as said carrier.

A honeycomb filter including partition walls having a porous partition wall base material and a surface layer provided on only inflow side or both inflow and outflow sides of the partition wall base material, and satisfying the following conditions capable of using as a DPF. The surface layer has a peak pore diameter of from 0.3 μm to 20 μm (exclusive) being equal to or smaller than the average pore diameter of the base material; the porosity of from 60% to 95% (exclusive) when measured by mercury porosimetry being larger than that of the base material; and the thickness L1 of from 0.5% to 30% (exclusive) of the partition wall thickness L2; and mass per filtration area of from 0.01 mg / cm2 to 6 mg / cm2 (exclusive). The base material has an average pore diameter of from 10 μm to 60 μm (exclusive) and a porosity of from 40% to 65% (exclusive).

This invention relates to silico-aluminum substrates, catalysts, and the hydrocracking and hydrotreatment processes that use them. The catalyst comprises at least one hydro-dehydrogenating element that is selected from the group that is formed by elements of group VIB and group VIII of the periodic table and a non-zeolitic silica-alumina-based substrate that contains an amount of more than 5% by weight and less than or equal to 95% by weight of silica (SiO2) and has the following characteristics:A mean pore diameter, measured by mercury porosimetry, encompassed between 20 and 140 Å,a total pore volume, measured by mercury porosimetry, encompassed between 0.1 ml / g and 0.6 ml / g,a total pore volume, measured by nitrogen porosimetry, encompassed between 0.1 ml / g and 0.6 ml / g,a BET specific surface area encompassed between 100 and 550 m2 / g,a pore volume, measured by mercury porosimetry, encompassed in the pores with diameters of more than 140 Å, of less than 0.1 ml / g,a pore volume, measured by mercury porosimetry, encompassed in the pores with diameters of more than 160 Å, of less than 0.1 ml / g,a pore volume, measured by mercury porosimetry, encompassed in the pores with diameters of more than 200 Å, of less than 0.1 ml / g,a pore volume, measured by mercury porosimetry, encompassed in the pores with diameters of more than 500 Å, of less than 0.01 ml / g,an X diffraction diagram contains at least the main lines that are characteristic of at least one of the transition aluminas contained in the group that consists of the alpha, rho, chi, eta, gamma, kappa, theta and delta aluminas.

A ceramic honeycomb structure having a large number of flow paths partitioned by porous cell walls, the cell walls meeting the conditions; (a) the cell walls having porosity of 55-80%, (b) the cell walls having a median pore diameter D50 (measured by mercury porosimetry) of 5-27 μm, (c) pores open on cell wall surfaces having an opening area ratio of 20% or more, (d) pores open on cell wall surfaces having a median opening diameter d50 (determined from equivalent circle diameters on an area basis) of 10-45 μm, (e) the density of pores open on cell wall surfaces having equivalent circle diameters of 10 μm or more and less than 40 μm being 350 / mm2 or more, (f) the maximum inclination of a curve of a cumulative pore volume relative to a pore diameter (determined from a pore distribution measured by mercury porosimetry) being 1.6 or more, and (g) a ratio D50 / d50 of the median pore diameter D50 to the median opening diameter d50 being 0.65 or less.

A niobium or tantalum powder characterized in that it comprises aggregates of primary particles of niobium or tantalum and has a pore distribution having a peak in the range of 1 to 20 mu m as measured by the mercury porosimetry. The niobium or tantalum powder comprises aggregates having large pores, which communicate with voids being present between primary particles and facilitate the permeation of an electrolyte over the whole of the inside of each aggregate. Accordingly, a solid electrolytic capacitor having an anode electrode prepared by using the niobium or tantalum powder has a high capacity and also a low ESR.