225 results about "TETRAETHYLAMMONIUM HYDROXIDE" patented technology

A process for preparing crystalline alumino-silicate compositions has been developed. The process involves preparing a charge density mismatch reaction mixture comprising sources of aluminum, silicon, optionally an E metal and at least one charge density mismatch (CDM) template. The CDM template is an organic nitrogen containing template, in the hydroxide form, e.g. tetraethylammonium hydroxide and is characterized in that it is incapable of inducing crystallization. To this mixture there is added a solution comprising a second templating agent termed a crystallization template (CT). The CT can be an organic template different from the CDM template, an alkali metal, an alkaline earth metal and mixtures thereof.

A process for preparing crystalline alumino-silicate compositions has been developed. The process involves preparing a charge density mismatch reaction mixture comprising sources of aluminum, silicon, optionally an E metal and at least one charge density mismatch (CDM) template. The CDM template is an organic nitrogen containing template, in the hydroxide form, e.g. tetraethylammonium hydroxide and is characterized in that it is incapable of inducing crystallization. To this mixture there is added a solution comprising a second templating agent termed a crystallization template (CT). The CT can be an organic template different from the CDM template, an alkali metal, an alkaline earth metal and mixtures thereof.

The invention belongs to the technical field of preparation of inorganic multistage pore materials, and relates to a one-step preparation method for a hydrogen type multistage pore molecular sieve with SAPO-5 and SAPO-34 symbiosis. According to the invention, tetraethylammonium hydroxide (TEAOH) is used as atemplate agent, and an organic silicon surface active agent (STSAC) is used at the same time to prepare a hydrogen type micropore-mesopore composite molecular sieve with SAPO-5 and SAPO-34 symbiosis in one step through the hydrothermal method, so that the acid exchange step is avoided, and the cost is reduced. The molecular sieve is used as catalyst for preparing low-carbon olefin with methanol, so that the limitations to aspects of dispersion and mass transfer can be overcome, the caking speed is reduced, the catalysis life is possibly prolonged, and wide application foreground is anticipated in industrial catalysis.

The invention discloses silicon solar cell front face electrode lead-free silver paste and a preparing method thereof. The silicon solar cell front face electrode lead-free silver paste is characterized in that inorganic glass powder is not contained in the silver paste, and the silver paste comprises, by mass, 75-85 percent of conductive silver powder, 1-5 percent of antireflective film corrosive, 10-20 percent of organic vehicle and 1-5 percent of additive; the conductive silver powder is formed by mixing micro silver powder and nano silver powder with the mass ratio of 10:1-2; the antireflective film corrosive comprises one or more of potassium fluotitanate, potassium fluoroaluminate, potassium fluosilicate and potassium fluoborate; the additive comprises one or more of ethanol amine, diethanol amine, triethanol amine, tetramethylammonium hydroxide, tetraethylammonium hydroxide and tetramethylammonium hydroxide. According to the silicon solar cell front face electrode lead-free silver paste and the preparing method thereof, lead-free silver paste printing and antireflective film removing are conducted in one step, sintering can be conducted at a low temperature, the compactness and the smoothness of a silver electrode film are improved, and the photoelectric conversion efficiency of a silicon cell piece is improved.

The invention belongs to the technical field of molecular sieve, and particularly relates to an SAPO-34 (Silicoaluminophosphate-34) molecular sieve catalyst and application thereof to preparation of low-carbon olefin from methanol. The spherical SAPO-34 molecular sieve agglomerated by nanoparticles is synthesized by modulating reaction initial gel concentration, and the size range is within a range of 0.5 micron to 10 microns. Tetraethylammonium hydroxide is used as a template and is mixed with an aluminum source, a silicon source and a phosphorus source; the gel concentration is controlled by adding a specific amount of solvent; and the catalyst is quickly prepared by the conventional hydrothermal or microwave heating mode. The spherical SAPO-34 molecular sieve provided by the invention has the characteristics of quickness in production, low cost in gel synthesis raw materials, low reaction energy consumption, high molecular sieve yield and the like. The characteristic of microspheres agglomerated by the nanoparticles enables long life of catalytic application of the nanoparticles, the characteristic of a catalytic effect of the molecular sieve in catalytic reaction can be obviously improved, and meanwhile, the molecular sieve catalyst also has the advantage of easiness in separation and extraction after synthesis of a micron scale catalyst.

The invention relates to a synthesis method for nanometer Beta zeolite, which mainly solves the problems in the prior art that the synthesized Beta zeolite has big crystal particle, and the efficiency is low when the nanometer zeolite is recovered with a common filtering or centrifugal separation method. The synthesis method for the nanometer Beta zeolite comprises the following steps: a) mixing a silicon source, an aluminum source, alkali MOH and compound template agent RN with water, wherein reaction mixture is calculated at the following molar ratio: SiO2 / Al2O3 is equal to 5-100, MOH / SiO2 is equal to 0.1-2.0, H2O / SiO2 is equal to 5-80, RN / SiO2 is equal to 0.01-1.0; crystallizing the mixture at the temperature of 110-200DEG C for 5-100hours to obtain crystallization liquid, wherein the compound template agent RN is the mixture of R1 and R2, R1 is selected from at least one of tetraethylammonium hydroxide and triethylamine or diethylamine, R2 is selected from tetraethyl ammonium halide, and the molar ratio of R1 to R2 is 0.05-2.0; and b) adding acid compound into the crystallization liquid, regulating the pH value of the crystallization liquid to be less than 11, and separating, washing and drying to obtain the nanometer Beta zeolite, wherein the acid compound is selected from at least one of inorganic acid, organic acid or ammonium chloride. According to the technical scheme, the problem is better solved. The synthesis method for the nanometer Beta zeolite can be used for the industrial production of the Beta zeolite.

The invention relates to a preparation method of a silicon aluminum phosphate molecular sieve of a multilevel porous structure, the prepared molecular sieve and application of the molecular sieve. Thepreparation method and the prepared molecular sieve are mainly used for solving the problems that the operation process is complicated and the cost is high since mesoporous template agents are adopted for synthesis in the prior art. The method includes the step of adopting the silicon aluminum phosphate molecular sieve of the porous structure for being in contact with a solution containing a modifier, wherein at least one of ammonium hydroxide, oxalic acid, acetic acid, ethanedioic acid, citric acid, sodium carbonate, sodium acetate trihydrate, sodium acetate, sodium hypochlorite, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutyl ammonium hydroxide is adopted as the modifier. By means of the technical scheme, the problems above are well solved, and the preparationmethod can be applied to industrial production of silicon aluminum phosphate molecular sieves of multilevel porous structures.

The invention relates to a preparation method of a non-binder ZSM-5 / zeolite beta coexisting molecular sieve catalyst. In the invention, the problems that when a hydrothermal synthesis method is adopted to prepare the existing ZSM-5 / zeolite beta coexisting molecular sieve, the preparation process is complicated, the cost is higher, the ZSM-5 / zeolite beta coexisting molecular sieve catalyst with the binder has lower activity, the non-binder ZSM-5 / zeolite beta coexisting molecular sieve has lower strength and the mechanical mixture of ZSM-5 with the binder and zeolite beta has lower activity, are mainly solved. The technical scheme in the invention comprises the following steps: mixing ZSM-5 / zeolite beta coexisting molecular sieve, alkaline substance, aluminum compound and silicon oxide, forming, drying, placing the dried mixture in template agent vapor containing at least one of ammonia water, ethylenediamine, triethylamine, n-butylamine, hexanediamine, tetrapropylammonium bromide or tetrapropylammonium hydroxide, and tetraethylammonium hydroxide or tetraethylammonium bromide to perform crystallization treatment at 100-200 DEG C for 10-300 hours and obtain the non-binder ZSM-5 / zeolite beta coexisting molecular sieve catalyst, wherein the weight contents of ZSM-5 / Magadiite coexisting molecular sieve, alkaline substance, aluminum compound and silicon oxide calculated according to the weight of the formed and roasted catalyst are 10-80%, 0.1-10%, 0.5-20%, and 20-80% respectively. The problems can be better solved and the prepared non-binder ZSM-5 / zeolite beta coexisting molecular sieve catalyst can be used in the naphtha catalytic cracking reaction for preparing propylene.