30results about How to "No apparent deactivation" patented technology

The invention discloses a preparation method of a phenylsulfonic acid-modified SBA-15 composite material, using SBA-15, a phenylsilane coupling agent and an anhydrous organic solvent as raw materials to prepare SBA-15-Ph; The obtained SBA‑15‑Ph is sulfonated to obtain a phenylsulfonic acid group modified SBA‑15 composite material; the present invention also discloses the application of the phenylsulfonic acid group modified SBA‑15 composite material in the synthesis of structural phospholipids, Using phospholipids and fatty acid methyl esters or fatty acid ethyl esters as raw materials, under the catalysis of phenylsulfonic acid group-modified SBA-15 composite materials, a new type of structural phospholipids is obtained. The modified phospholipids prepared by the present invention broaden the application range of phospholipids, and at the same time, the residual organic matter in the product is less; it can also solve the disadvantages of expensive enzyme sources, difficult recycling, and not wide reaction conditions in the process of enzymatic production of structural phospholipids, and finally improve the structure Preparation method of phospholipids.

The invention discloses a method for preparing SBA-15 modified by propylsulfonic acid groups. SBA-15, propylsilane coupling agent and anhydrous organic solvent are used as raw materials to prepare SBA-15-Pr; SBA‑15‑Pr is sulfonated to obtain propyl sulfonic acid modified SBA‑15; the invention also discloses the application of propyl sulfonic modified SBA‑15 in the synthesis of structural phospholipids, using phospholipids and fatty acid methyl esters Or fatty acid ethyl ester as raw material, under the catalysis of SBA‑15 modified by propylsulfonic acid group, to obtain structural phospholipids. The modified phospholipids prepared by the present invention are catalyzed and produced by heterogeneous catalysts, which have no organic residues in industrially produced phospholipids, and can also solve the shortcomings of expensive enzyme sources, difficult recycling, and harsh reaction conditions in the process of enzymatic production of structural phospholipids. Improved preparation of structured phospholipids.

The invention discloses a method for synthesizing a gamma, delta-nonsaturated ketones compound. The method comprises the following steps: under protection of inert gas, nonsaturated alcohol and 2-alkyloxy propylene are taken as the raw materials, Bronsted acid functional ionic liquid is dissolved in a high boiling solvent as a catalyst, a rearrangement reaction is carried out, after the reaction is complete, the materials is subjected to post-treatment to obtain the gamma, delta-nonsaturated ketones compound and a catalyst solution. The used Bronsted acid functional ionic liquid catalyst has a plurality of physical and chemical properties which are similar with the conventional ionic liquid, the acid functional group is introduced, so that the catalyst has the advantages of high acid site density, adjustable acidity, uniform acidity distribution and difficult loss of acidity. An autoclave series mode is used for realizing the continuous synthesis of nonsaturated ketone and continuous recycling of the catalyst.

The invention provides a method for preparing a nickel-magnesium solid solution catalyst. The flaky nano-nickel-magnesium solid solution is mixed with each other through different nickel-magnesium ratios, and the size is 20-40nm. The specific preparation method includes the steps: at room temperature, the metal precursor magnesium The salt is completely dissolved in distilled water and precipitated by lye, and then continue to add metal nickel salt for further precipitation. After fully stirring evenly, let it stand for a period of time, wash with a large amount of water, and dry to obtain a flaky nickel-magnesium solid solution catalyst. The obtained precursor was calcined at 450-550° C. for 3-8 hours to obtain a flaky nickel-magnesium solid solution catalyst with stable morphology. The invention has good dispersibility, controllable components, simple method, easy operation, good stability as a carrier, very good catalytic activity for preferential oxidation of carbon monoxide, wide temperature operating window and excellent catalytic stability and durability.

The invention discloses a RuCo alloy catalyst which breaks the restrictive relationship, its preparation method and its application for ammonia synthesis. The RuCo alloy catalyst comprises a nitrogen-doped carbon carrier and active metals Ru and Co supported on the carbon carrier. The present invention synthesizes a highly dispersed RuCo alloy single-atom catalyst through a reduction method, and the catalyst promotes N through the synergistic effect of Ru and Co 2 The dissociation of NHx and the desorption of NHx occur on different active sites, which breaks the restrictive relationship existing in the ammonia synthesis reaction. The obtained RuCo alloy single-atom catalyst has excellent catalytic performance for ammonia synthesis under mild conditions. Ammonia synthesis rate reached 11.2mmol under the condition NH3 / (g cat h), and has extremely high catalytic stability, and at the same time, the preparation method of the catalyst is simple, the utilization rate of metal atoms is high, and it has obvious industrial application value.

The invention discloses a preparation method of a Zn-SBA-15 composite material, which uses SBA-15, soluble zinc salt and anhydrous organic solvent as raw materials, and loads metal zinc on the SBA-15 molecular sieve through an impregnation method. The composite material has larger specific surface area and stronger acidity. The invention also discloses the application of Zn-SBA-15 composite material in synthesizing structural phospholipids, using phospholipids and fatty acids as raw materials, under the catalysis of Zn-SBA-15, to obtain structural phospholipids rich in fatty acids with different carbon chain lengths. The preparation method of the catalyst involved in the invention has the advantages of low cost, high catalytic performance of the product, etc., and conforms to the development trend of green chemical industry. The modified phospholipid synthesis method involved in the present invention has the advantages of economy, environmental protection, and high efficiency, and can solve the disadvantages of the enzymatic method, such as expensive enzyme sources, difficult recycling, and unsuitable reaction conditions, and finally improve the preparation method of structural phospholipids.

The invention provides a supported catalyst, a preparation method thereof, and a method for catalytically synthesizing N-ethylaniline, which relate to the technical field of catalysis. The supported catalyst provided by the invention, with Cu / Al 2 o 3 As the core, with SiO 2 For the shell, the Cu / Al 2 o 3 including Al 2 o 3 and loaded at the Al 2 o 3 Cu in the pores and on the surface. In the present invention, SiO 2 For the shell not only can strengthen Cu / Al 2 o 3 In the process of catalyzing the synthesis of N-ethylaniline, it can also limit the further collision between the target product N-ethylaniline and unreacted ethanol on the active site of Cu to generate N,N-di The rate of ethylaniline, thereby improving the selectivity of N-ethylaniline.

The invention provides a rod-like nanometer nickel containing metal solid solution catalyst and a preparation method thereof. The ingredient of the rod-like nanometer nickel containing metal solid solution catalyst is a nickel-magnesium solid solution formed by nickel and magnesium which are adulterated with each other, the size is 300-600nm, and the section width is 40-70nm. The preparation method of the rod-like nanometer nickel containing metal solid solution catalyst comprises the following steps: mixing nickel-magnesium metal salt with deionized water uniformly when the temperature ranges from room temperature to 70 DEG C, maintaining constant temperature for 5-10min, adding a surface active agent after stabilizing for a period of time, reacting for 20-30min, then adding an organic solvent, after drying, rinsing by using the organic solvent, and carrying out vacuum drying to obtain a rod-like nanometer nickel-magnesium solid solution catalyst precusor. The obtained precursor is roasted for 2-8h at 550-750 DEG C to obtain the rod-like nanometer nickel-magnesium solid solution catalyst which is uniform and stable in shape and good in dispersity. According to the catalyst provided by the invention, the dispersity is good, and the ingredient is controllable; the method is simple, the operation is easy, the shape of the catalyst is uniform, the stability performance is good, and the catalyst has excellent catalytic activity for reforming reaction of methane and carbon dioxide.

The invention discloses a catalyst for hydrogenating dimethyl oxalate to prepare ethylene glycol. The catalyst is a hollow ring structure. The catalyst comprises the following components in parts by weight: 1-50 parts of active components; 0-50 parts of promoter metals 10 parts; 30-90 parts of carrier. The active component is at least one of copper, silver, nickel, cobalt, gold and iron; the carrier is SiO 2 , carbon nanotubes, activated carbon, graphene, mesoporous carbon, ZrO 2 、Al 2 o 3 , ZnO, SBA-15, HMS, ZSM-5, MCM-41 and at least one of MCM-48. The catalyst for the hydrogenation of dimethyl oxalate to ethylene glycol of the present invention has high activity, good stability and high selectivity, the conversion rate of dimethyl oxalate can be greater than 99.9%, and the selectivity of ethylene glycol is greater than 96%. There are few by-products, and the target product is easy to separate. After 1000 hours of single-tube long-term operation of the catalyst, the reaction is stable and there is no obvious deactivation phenomenon.

The present invention provides a precious metal catalyst loaded by a metal oxide, a preparation method, and applications. The precious metal catalyst comprises the following components: a precious metal, an oxide of the precious metal, and a metal oxide. In the precious metal catalyst loaded by a metal oxide, the ratio of the mass of the precious metal to the total mass of the precious metal and the metal oxide is -1 to 10:100, and the precious metal catalyst loaded by a metal oxide is of a two-dimensional structure. The preparation method in the present invention is easy to operate, the prepared catalyst has uniform morphology and good stability; and when the catalyst is applied in a methane combustion reaction, the conversion rate of methane reaches 100% when the reaction temperature of C¾ below 400ºC, and a good low-temperature oxidization activity of the methane is provided. In addition, the precious metal catalyst loaded by a metal oxide has the advantages of good stability, a long service life, good water resistance and the like, and has no obvious deactivation phenomenon at the temperature ranging from 310ºC to 500ºC for 100 hours, and has a good industrial application prospect.

The invention discloses a supported tricobalt tetroxide catalyst and a preparation method and application thereof. The supported tricobalt tetroxide catalyst comprises the following components: noble metal, noble metal oxide and cobalt tetroxide, the ratio of the mass of the noble metal element to the total mass of the noble metal element and Co3O4 is 1-10:100, and the supported tricobalt tetroxide catalyst has a one-dimensional structure. The preparation method is as follows: in the glycol system, co-precipitation of cobalt salt and precipitant aqueous solution, then adding precious metal salt solution, hydrothermal, drying and roasting to obtain a supported tricobalt tetroxide catalyst, using co-precipitation method and hydrothermal synthesis method Combined preparation of supported tricobalt tetroxide catalyst. The preparation method is simple and easy to operate, the prepared catalyst has uniform morphology and good stability, and can be used in the catalytic combustion reaction of methane, so that when the reaction temperature of CH4 is below 400 oC, the methane conversion rate can be as high as 100%, and it has good low-temperature oxidation of methane. active.