36results about How to "Improve carbon storage capacity" patented technology

The invention relates to a hierarchical-hole HZSM-5 catalyst suitable for a reaction for preparation of ethylene through dehydration of low-concentration ethanol, and is used for mainly solving the problems of low catalyst activity, poor catalyst stability, easy loss of active metals and the like existing in the prior art. The invention also relates to preparation of the modified catalyst and an application of the modified catalyst in the reaction for preparation of ethylene through dehydration of low-concentration ethanol. The molecular sieve catalyst can convert ethanol into ethylene with high conversion rate and high selectivity, and has the advantages of high activity at low temperature, good stability, high selectivity of ethylene, long catalytic life and the like.

The invention relates to a method for preparing low-carbon olefin through methanol dehydration, and mainly solves the problems that the activity of a catalyst and the yield of the low-carbon olefin are low in the conventional technology for preparing the low-carbon olefin through catalytic pyrolysis. In the invention, methanol which is taken as a raw material is contacted with an adhesive-free molecular sieve catalyst through a catalyst bed to generate the low-carbon olefin under the conditions that the reaction temperature is 400 to 600 DEG C, the gauge pressure of the reaction is 0.001 to 0.5MPa, the weight space velocity of the reaction is 0.1 to 4h<-1> and the weight ratio of water to methanol is (0.1-3):1, wherein the pore volume, the average aperture and porosity of the adhesive-free molecular sieve catalyst are tested by mercury porosimetry, the pore volume is 0.31 to 0.5ml / g, the average aperture is 71 to 100nm, and the porosity is 31 to 40 percent. Through the technical scheme, the problems are better solved. The method can be used for the industrial production of the low-carbon olefin through methanol dehydration.

The invention relates to an alumina carrier, which has a specific surface area of 50-130 m<2> / g and a total pore volume of 0.5-1.0 ml / g, wherein the pore volume of the pore having a diameter of 2-10 nm in the carrier accounts for 4-15% of the total pore volume, the pore volume of the pore having a diameter of 10-20 nm in the carrier accounts for 40-60% of the total pore volume, the pore volume of the pore having a diameter of 20-50 nm in the carrier accounts for 1.0-5.0% of the total pore volume, and the pore volume of the large pore having a diameter of more than 50 nm and not more than 10 [mu]m in the carrier accounts for 20-50% of the total pore volume. According to the present invention, the catalyst obtained by loading the active component on the carrier has the good reaction performance when the catalyst is used for the olefin preparation reaction through low carbon alkane dehydrogenation.

The invention discloses a modified molecular sieve catalyst for ethanol dehydration to produce ethylene. The catalyst is prepared through the following steps: preparing an unmodified bar-shaped molecular sieve catalyst from HZSM-5 molecular sieve powder and macro-porous pseudo-boehmite powder, sequentially carrying out alkali modification and acid modification by using an aqueous Na2CO3 solution and an aqueous citric acid solution, and baking and calcining the modified bar-shaped molecular sieve catalyst. The invention also discloses an application of the modified molecular sieve catalyst forethanol dehydration to produce ethylene. The preparation modification process of the catalyst does not require a stirring process, so the preparation process is simplified, the weak acid amount of thesurface of the catalyst is greatly increased, and the medium and strong acid amount is reduced, thereby the catalysis effect of the modified molecular sieve catalyst on an ethanol dehydration reaction for producing ethylene is improved, the conversion rate of the raw material ethanol and the selectivity of the product ethylene are increased, and the service life of the modified molecular sieve catalyst is prolonged; and the modified molecular sieve catalyst has a simple application in the dehydration of ethylene to produce ethylene, and is suitable for being promoted.

The invention discloses a bioorganic fertilizer containing magnesium process desulphurization slag, and a preparation method thereof. The bioorganic fertilizer containing magnesium process desulphurization slag adopts animal manure, germ bran and rice bran as an organic matter source with stable quality; the magnesium process desulphurization slag can regulate the pH value of soil, improve the carbon storage capacity and the middle and trace element content of the soil, improve the granule structure of the soil and increase the output and the quality of crops; charcoal has good hydroscopicity, also has a part of functional hydrophobic groups, and can prevent hardening while adsorbing free water in the desulphurization slag; bentonite has great hydroscopicity, can adsorb the free water in the desulphurization slag, and modifies the desulphurization slag through ion displacement; humic acid can chelate metal ions in the soil and fertilizers, and facilitates transmission of nutrients to crops; and the bioorganic fertilizer also has the advantages of good ion exchange and buffer property, improvement of the structure of the soil, specific ratio of the raw materials, environmental protection, and improvement of the quality of the soil.

An alumina support has a specific surface area of ​​50-130m2 / g and a total pore volume of 0.5-1.0ml / g, and the pore volume of pores with a diameter of 2-10 nanometers in the support accounts for 4-15% of the total pore volume. The pore volume of pores with a diameter of 10-20 nm accounts for 40-60% of the total pore volume, the pore volume of pores with a diameter of 20-50 nm accounts for 1.0-5.0% of the total pore volume, and the diameter is greater than 50 nm but not greater than 10 The pore volume of micron macropores accounts for 20-50% of the total pore volume. The catalyst obtained after the carrier supports the active components is used for the reaction of producing olefins from the dehydrogenation of low-carbon alkanes, and has good reaction performance.

The invention relates to a method for preparing low-carbon olefin through methanol dehydration, and mainly solves the problems that the activity of a catalyst and the yield of the low-carbon olefin are low in the conventional technology for preparing the low-carbon olefin through catalytic pyrolysis. In the invention, methanol which is taken as a raw material is contacted with an adhesive-free molecular sieve catalyst through a catalyst bed to generate the low-carbon olefin under the conditions that the reaction temperature is 400 to 600 DEG C, the gauge pressure of the reaction is 0.001 to 0.5MPa, the weight space velocity of the reaction is 0.1 to 4h<-1> and the weight ratio of water to methanol is (0.1-3):1, wherein the pore volume, the average aperture and porosity of the adhesive-free molecular sieve catalyst are tested by mercury porosimetry, the pore volume is 0.31 to 0.5ml / g, the average aperture is 71 to 100nm, and the porosity is 31 to 40 percent. Through the technical scheme, the problems are better solved. The method can be used for the industrial production of the low-carbon olefin through methanol dehydration.

Disclosed is a chitosan sustained releasing microsphere fertilizer for effective prevention and treatment of tomato fruit cracking. The chitosan sustained releasing microsphere fertilizer is characterized by being prepared from raw materials of chitin, sodium hydroxide, calcium chloride, zinc sulfate, copper phosphate, acetic acid, glycerin monostearate, cyclohexan, folic acid, glutaraldehyde, petroleum ether, isopropanol, soybean straw, maize straw, livestock faeces, river sludge, urea, monopotassium phosphate, sodium dihydrogen phosphate, and an appropriate amount of water. The prepared chitosan sustained releasing microsphere fertilizer has the integrated characteristics of improving yield, being efficient, having long-acting effects, improving fruit quality and improving soil; meanwhile, the chitosan sustained releasing microsphere fertilizer has the advantages of being low in cost, simple in technology, having no residue and no pollution, saving labor and time during construction and the like.

The invention relates to the field of fertilizers for acidic soil and particularly relates to a special biochar-based organic and inorganic composite fertilizer for acidic soil and a preparation method thereof. The special biochar-based organic and inorganic composite fertilizer for the acidic soil is prepared from the following raw materials: biochar, an acidity regulating substance, a nitrogen-containing substance, a phosphorus-containing substance, a potassium-containing substance, mineral powder and a granulation binder, wherein the granulation binder comprises attapulgite powder and sodium silicate. The composite fertilizer is prepared by mixing the biochar as a controlled-release material and an adsorption material with other components according to a certain proportion, the matching of the components is reasonable, and the nutritional requirements of growth of crops can be well met; the sustained-release effect is good, and the composite fertilizer only needs to be applied once; the composite fertilizer has the effects of improving the pH value of the soil, improving the content of a carbon pool in soil, improving the aggregate structure and the porosity of the soil and reducing toxicity of heavy metals and organic pollutants and can achieve the effects of saving labor, saving the fertilizer and improving the yield and the quality of agricultural products. The invention further provides the preparation method of the composite fertilizer. The preparation method is simple and feasible.

The invention relates to a preparation method for an adhesive-free fluidized bed catalyst. The problem of low activity of the fluidized bed catalyst in the prior art is mainly solved. The problem is well solved by adopting the technical scheme that the preparation method for the fluidized bed catalyst comprises the following steps of: (a) uniformly mixing molecular sieve, adhesive, a matrix material, a pore expanding agent, dispersant and a liquid medium to form suspension; (b) performing high-speed shearing and dispersion, and controlling the granularity of the materials in the suspension tobe between 0.1 and 5 microns; (c) performing spray drying on the suspension to form a micro-spherical catalyst precursor I; (d) roasting the micro-spherical catalyst precursor I at the temperature ofbetween 300 and 700 DEG C for 1 to 10 hours to obtain a catalyst precursor II; (e) putting the catalyst precursor II into template steam, and crystallizing at the temperature of between 100 and 200 DEG C for 10 to 200 hours to obtain a catalyst precursor III; and (f) roasting the micro-spherical catalyst precursor III at the temperature of between 400 and 700 DEG C for 1 to 10 hours to obtain a catalyst finished product. The catalyst can be applied to the reaction process of preparing low-carbon olefin by catalytic pyrolysis of light oil.

The invention, belonging to the technical field of catalyst and its application, particularly relates to an ultrafine molecular sieve structured catalytic material based on a porous silicon carbide carrier and a preparation method thereof. The material comprises ultrafine molecular sieve crystals as active elements and has a hierarchically porous structure, and the whole ultrafine molecular sieve coating has catalytic activity. The method is characterized by coating a colloidal molecular sieve precursor on the surface of a modified foam silicon carbide carrier, converting the molecular sieve precursor into ultrafine molecular sieve crystals by vapor phase treatment to realize the firm combination between the coating and the carrier. According to the invention, by controlling the synthesis conditions of the colloidal molecular sieve precursor and the method of adding a pore forming agent, the size of the molecular sieve crystals, silica-alumina ratio and intercrystalline porosity can be controlled; a pore structure and the type of the molecular sieve can be designed according to the geometrical structure of a target product; and the capacity of accommodating carbon is raised, the mass transfer capability of the catalyst is reinforced, and the life of catalyst is prolonged while keeping the high activity of the ultrafine molecular sieve and high target product selectivity.

The invention relates to a method for preparing light olefin by dehydrating oxygen compound, mainly solving the problems that activity of a catalyst is low and yield of the light olefin is low in the traditional technology for preparing the light olefin through catalytic pyrolysis. In the invention, a method for preparing the light olefin by dehydrating the oxygen compound is adopted, a binder-free molecular sieve is taken as a catalyst, methanol or dimethyl ether is taken as raw material, the raw material is contacted with the catalyst by virtue of a catalyst bed and reaction is carried out to generate the light olefin under the conditions that reaction temperature is 400-600 DEG C, reaction gauge pressure is 0.001-0.5MPa, reaction weight airspeed is 0.1-4 / hour and weight ratio of water to methanol is (0.1-3): 1, wherein pore volume of the binder-free molecular sieve catalyst is 0.1-0.3ml / g, average pore size is 50-70nm, porosity factor is 20-30%, and content of the binder is 0-5%; and strength of the catalyst after moulding and sintering is 60-200N. By adopting the technical scheme, the problems are solved, and the method provided by the invention can be applied to industrial production of the light olefin prepared by dehydrating the oxygen compound.

The invention relates to a synthesized multilevel structure ZSM-5 zeolite molecular sieve with intracrystalline meso pores and intercrystalline meso pores, as well as a synthetic method and an application thereof. Except micropores of the zeolite structure, the multilevel structure ZSM-5 zeolite molecular sieve comprises the intracrystalline mesoporous and intercrystalline mesoporous structure, wherein primary nanometer crystal grain size is 40-500nm, and secondary accumulated particle size is 500nm-5[mu]m. The structure greatly improves diffusion performance and the catalyst activity of the molecular sieve, reduces possibility of generation of side reaction and carbon deposit, improves carbon accommodating capability of the molecular sieve catalyst, and prolongs life of the catalyst.

The invention relates to a method for producing arene by utilizing methanol, and mainly solves the problems of the existing method that a catalyst is rapid in carbon deposition and low in stability during a methanol producing process. The method comprises the following steps: based on methanol as a raw material, carrying out a contact reaction between methanol and the catalyst on a continuous fixing bed at the reaction temperature of 370 to 480 DEG C and the reaction weight space velocity of 0.5 to 4.0 h<-1>, thereby producing arene, wherein the catalyst comprises the following components according to parts by weight: a) 20 to 75 parts of binding agent; b) 20 to 75 parts of ZSM-5 molecular sieve; and c) 0.5 to 10 parts of zinc or oxides thereof; and the problems are solved well by adopting the technical scheme that the ratio of SiO2 to Al2O3 in the ZSM-5 molecular sieve is 20 to 200. Therefore, the method provided by the invention can be applied to the industrial production of arene by utilizing methanol.

The invention belongs to the field of catalysts and their preparation, and relates to a composite hierarchical porous molecular sieve catalyst for producing aromatics from low-carbon alkanes and a preparation method thereof. The catalyst component includes: a multi-level porous HZSM-5 molecular sieve synthesized by a hard template method, a HMCM-22 molecular sieve, a main active component, a noble metal / non-precious metal modifier and a small amount of binder. The catalyst of the invention has excellent low-carbon alkane aromatization performance, simple preparation process, controllable cost and good industrial application prospect.