32results about How to "Improved pore distribution" patented technology

The invention discloses an additive for improving the octane value of gasoline through catalytic cracking and a preparation method of the additive. The additive comprises the following ingredients by weight percentage: 0-70% of a molecular sieve, 10-70% of a matrix, 0-10% of a non-metallic active substance, 0-50% of a binding agent and 0-30% of an additive, wherein the silica-aluminum ratio in the molecular sieve is greater than or equal to 200. The additive for improving the octane value of the gasoline through catalytic cracking is obtained by the following processes: dipping, pulping, spray drying, roasting and aging. The additive for improving the octane value of the gasoline through catalytic cracking has the characteristics of high reaction activity, high hydrothermal stability, high durability in a reaction process and low deactivation velocity.

Disclosed is a method of preparing propylene by oxygen-containing compounds. The method comprises the following steps that: the oxygen-containing compounds contacts and reacts with a spent catalyst and / or a regenerated catalyst in a first reactor; after having a contact reaction with a regenerated catalyst in a second reactor, ethylene and light olefins are introduced into a third reactor for a further reaction. The catalyst in the first reactor is a spent catalyst and / or a regenerated catalyst, and contains modified medium pore zeolites. According to the method of preparing propylene by oxygen-containing compounds provided in the invention, propylene prepared has high selectivity.

The invention discloses an attapulgite composite glass fiber core material and a preparation method thereof. The core material uses glass fiber as a matrix, and the mass fraction is 60% to 78%. Between the pores of the glass fibers, 15% to 25% of bird's nest nanorod crystal attapulgite, 5% to 10% of layer chain attapulgite aerogel and 2% to 5% of binder are doped. The composite core material of the present invention can effectively utilize the bird's nest microstructure of nano-rod crystal attapulgite and the layer-chain nanofiber structure of attapulgite airgel to optimize the micron-based microstructure of the glass fiber core material. By adjusting the pore classification and pore size of the glass fiber core material, the structural stability and thermal insulation performance are improved, while the air pressure sensitivity is reduced, and the service life of the vacuum insulation panel is prolonged. In addition, the nano-rod attapulgite has excellent properties such as corrosion resistance, high temperature resistance and environmental protection, so that the composite core material can be used at higher temperatures.

The invention discloses a preparation method of aluminum hydroxide. In the method, sodium aluminate and CO2 are subjected to precipitation. Specifically, one part of sodium aluminate has a changed pH value, and the other part of sodium aluminate has a constant pH value, and they are subjected to co-precipitation in single streams. Simultaneously, a high-molecular surfactant is added. Aluminum hydroxide obtained by the method of the invention has large specific surface area and pore volume, as well as pore size distribution concentrated in the range of 10-20nm. The aluminum hydroxide in the invention is especially suitable to serve as a carrier of a diene selective hydrogenation catalyst, and has the characteristic of high hydrogenation performance.

The invention discloses a preparation method of a Fe3O4-based biochar soil passivating agent. The preparation method of the Fe3O4-based biochar soil passivating agent comprised the steps of (1) carbonizing Sinkiang walnut shells into biochar in nitrogen condition; (2) adding the biochar into a water solution of acetic acid and acetylacetone for modifying; (3) weighing a certain amount of FeCl3 andFeCl2 and dissolving FeCl3 and FeCl2 in water to form a solution; (4) adding the biochar into the solution of step (3) with stirring and then pouring ammonium hydroxide into the solution until no more precipitation is generated; (5) separating solid from liquid and the Fe3O4-based biochar soil passivating agent is obtained by cleaning the solid part with distilled water, drying to constant weight, crushing and sieving through a sample sieving screen. The soil passivating agent is based on the huge specific surface area and strong micropore structure of the biochar, so that heavy metal compound in soil can be effectively adsorbed and immobilized; the charge capacity of the surface of the biochar and the heavy metal ions of the soil generate static electricity, so that the adsorbing capacity can be improved; the form and transfer behavior of heavy metal in the soil can be significantly affected, the stability of the heavy metal can be improved and the heavy metal can be prevented from being absorbed by crops.