The invention relates to a preparation method of a supported palladium nanocatalyst, and belongs to the technical field of catalysis The catalyst adopts a ceramic membrane as a carrier, firstly, the surface and pore channels of the ceramic membrane are modified by dopamine, and then the modified membrane is impregnated with an active component palladium salt solution and then is reduced by hydrazine hydrate to obtain the catalyst The preparation method has the advantages that the dopamine modified ceramic membrane are loaded with nano palladium catalyst particles, the loading amount of the nanocatalyst is increased, at the same time, the bonding force between the catalyst particles and the membrane is enhanced, and the catalytic activity and stability of the catalyst are improved; and besides, the problem that the catalyst and a product are difficult to separate subsequently is solved, and the preparation method can be widely applied in a hydrogenation reaction process

Preparation method of supported palladium nanocatalyst

The invention relates to a solid catalyst for synthesizing butadiene from alcohol. The solid catalyst comprises a meso-porous silicon carrier, an oxidizing active ingredient and a condensation dehydration active ingredient, wherein the oxidizing active ingredient and the condensation dehydration active ingredient are loaded on the meso-porous silicon carrier; the oxidizing active ingredient contains transition metal silicate; the condensation dehydration active ingredient contains transition metal oxide; through being metered by the mass of the meso-porous silicon carrier, the content of the transition metal element in the oxidizing active ingredient is 0.5 to 25.0 weight percent; the content of the transition metal element in the condensation active ingredient is 0.5 to 10.0 weight percent. The invention also relates to a preparation method of the solid catalyst. The catalyst prepared by the invention has the advantages that the adverse influence between the transition metal elements in the oxidizing active ingredient and the condensation dehydration active ingredient is eliminated, so that the activity and the stability of the catalyst are improved; meanwhile, the catalyst has good water resistance.

Solid catalyst for synthesizing butadiene from alcohol, and preparation and application thereof

The invention relates to a preparation method of a multi-phase catalyst for decomposing formic acid to generate hydrogen, which belongs to the technical field of the preparation of catalysts. The preparation method comprises the following steps: ultrasonically dispersing carbon carriers into water, and sufficiently stirring to obtain a first suspension; adding a sodium citrate solution into the first suspension, and sufficiently stirring to obtain a second suspension; pouring a sodium borohydride into the second suspension, and obtaining a third suspension; preparing a mixed solution of chloropalladic acid and chloroauric acid, adding a sodium hydroxide solution into the mixed solution, then adding into the third suspension, stirring at room temperature, and obtaining the multi-phase catalyst for decomposing formic acid to generate hydrogen. The invention provides a simple and convenient preparation method for PdAu/C alloy catalyst, and a prepared sample has excellent catalytic performance for the decomposition reaction of formic acid at room temperature.

Preparation method of multi-phase catalyst for decomposing formic acid to generate hydrogen

The invention provides a functional graphene loaded gold palladium nano-catalyst as well as preparation and application thereof. A one-step fast reduction method is used; a functional graphene loadedgold palladium nano-catalyst is fast synthesized at room temperature; the advantages that the synthesis time is short, the operation is simple and convenient, and the like are realized; the dispersionperformance of gold palladium nanometer particles on graphene carriers (NH2-N-rGO) modified by -NH2-N is obviously improved; the particle dimension (0.3 to 2.8nm) of metal NPs is effectively reduced;the synthesized AuPd/NH2-N-rGO catalyst is used for catalyzing methanoic acid water solution for room temperature decomposition for hydrogen preparation. The catalyst still has high catalysis activity under the condition of no additive existence; the conversion rate is 100 percent; the hydrogen selectivity is 100 percent; the circulation stability is high; the catalysis activity is high.

Functional graphene loaded gold palladium nano-catalyst as well as preparation and application thereof

The invention discloses a method for catalyzing dehydrogenation of formaldehyde by using a Pd@CoO CNx core-shell type catalyst. The method provided by the invention comprises the following steps: placing a catalyst into a reactor, placing the reactor into a water bath, carrying out heating, then adding a mixed solution of formaldehyde and sodium hydroxide into the reactor for a reaction, and collecting generated hydrogen through a drainage method. The Pd@CoO-CNx core-shell type catalyst is synthesized through the following steps: a) dissolving cobalt nitrate and 2-methylimidazole into a methanol solution so as to form a uniform solution, carrying out stirring at a room temperature, and carrying out centrifuging so as to obtain (Co)MOF; b) dispersing the (Co)MOF into an Na2PdCl4 solution, carrying out full stirring, and carrying out reducing with a sodium borohydride solution so as to obtain Pd@(Co)MOF; and c) transferring the Pd@(Co)MOF to a tubular atmosphere furnace, and carrying outcalcination for a period of time under mixed gas so as to prepare the Pd@CoO-CNx core-shell type catalyst. According to the invention, through adjustment of the mol ratio of metals namely Pd, Co andCNx in a catalyst, the Pd@CoO-CNx core-shell type catalyst with high activity, high selectivity and high stability and used for dehydrogenation of the formaldehyde for hydrogen production can be prepared.

Method for catalyzing dehydrogenation of formaldehyde by using Pd@CoO-CNx core-shell type catalyst

The invention discloses a method for formate dehydrogenation under catalysis of a supported Ag-Pd/C3N4 nano-catalyst and belongs to the technical fields of chemistry and chemical engineering. The well-prepared supported Ag-Pd/C3N4 nano-catalyst is put in a reactor, the reactor is put in an oil bath and heated to a certain temperature, a mixed solution of formic acid and sodium formate is added to the reactor for a reaction, and generated hydrogen is collected with a drainage method. The supported Ag-Pd/C3N4 nano-catalyst is prepared as follows: a solution is prepared from Ag and Pd in a certain mole ratio, a carrier C3N4 is added to the solution, a reducer is added to the mixed solution, and filtration and drying are performed. Compared with conventional supported catalysts, the high-activity and high-selectivity supported Ag-Pd/C3N4 nano-catalyst used for formate dehydrogenation to prepare hydrogen can be prepared by adjusting the content of Ag, Pd and C3N4.

Method for formate dehydrogenation under catalysis of supported Ag-Pd/C3N4 nano-catalyst

The invention discloses a method for catalyzing formic acid for dehydrogenation by use of a supported Au-Pd/mpg-C3N4 nano-catalyst and belongs to the technical field of chemistry and chemical engineering. The method comprises the following steps: placing the well prepared supported Au-Pd/mpg-C3N4 nano-catalyst into a reactor; placing the reactor in an oil bath; heating up to a certain temperature; adding a formic acid and sodium formate mixed solution into the reactor for reaction; collecting generated hydrogen by the drainage method. The supported Au-Pd/mpg-C3N4 nano-catalyst is prepared in such a way that Au, Pd and deionized water are configured according to a certain molar ratio, a supporter mpg-C3N4 is added into the obtained solution, a reducing agent is added into the obtained mixed solution, and filtering and drying are performed. Compared with the traditional supported catalyst, the supported Au-Pd/mpg-C3N4 nano-catalyst which is high in activity and selectivity and used for manufacturing hydrogen by formic acid dehydrogenation is only prepared in such a way that the contents of metal gold and palladium in the catalyst and the content of mpg-C3N4 are adjusted.

Method for catalyzing formic acid for dehydrogenation by use of supported Au-Pd/mpg-C3N4 nano-catalyst

The invention discloses a method for catalyzing hydrazine hydrate dehydrogenation with a RhNiFe/CeO2@C3N4 nanometer catalyst, and belongs to the technical fields of chemistry and chemical industry. A prepared nanometer catalyst is put in a reactor, the reactor is put in an oil bath, the temperature is raised to a certain degree, then a mixed solution of hydrazine hydrate and sodium hydroxide is added into the reactor for a reaction, and the produced hydrogen is collected through drainage. The nanometer catalyst is synthesized through the following steps: a) mixing cerium nitrate and a melamine solution according to a certain mass ratio till cerium nitrate is dissolved; b) stirring the obtained mixed solution till the solution is dried, and transferring the obtained product to a tubular furnace for calcination to obtain a CeO2@C3N4 carrier; and c) putting the CeO2@C3N4 carrier obtained from calcination in a solution containing Rh, Ni, and Fe with a certain ratio, performing full stirring, adding a reductant to the obtained mixed solution, and performing filtration and drying. The RhNiFe/CeO2@C3N4 nanometer catalyst has excellent activity and selectivity. The catalyst is adopted in a hydrazine hydrate dehydrogenation reaction, the dehydrogenation conversion rate and the selectivity can reach 100%, and the reaction TOF value is more than 720 h .

Method for catalyzing hydrazine hydrate dehydrogenation with RhNiFe/CeO2@C3N4 nanometer catalyst

The invention discloses a method for using AgO/Cr2O3-MgO-SiO2 four-component composite oxide catalyst for catalyzing ethyl alcohol to prepare butadiene and belongs to the technical field of chemistry and chemical engineering Chromium salt, magnesium salt, silicate and deionized water are prepared according to a certain molar ratio, the pH value is adjusted through alkali liquor, and through the steps of concentrating, filtering, drying, roasting and cooling, Cr2O3-MgO-SiO2 three-component carriers are obtained through preparation; a certain quantity of three-component carriers are placed into an AgNO3 solution of certain concentration, stirred to be thick at certain temperature, transferred into a drying oven to be dried, then placed into a muffle furnace to be roasted for certain time at certain temperature, ground and sieved to obtain the four-component composite oxide catalyst Compared with traditional three-component catalyst, according to the method, the substance amount ratio of metal four-component catalyst in the catalyst is adjusted so that the high-activity four-component composite oxide catalyst can be obtained and used for catalyzing ethyl alcohol to prepare butadiene

Method for using AgO/Cr2O3-MgO-SiO2 four-component composite oxide catalyst for catalyzing ethyl alcohol to prepare butadiene

The invention discloses a catalytic dehydrogenation method for hydrazine hydrate through an RhNiCo/CeO2@P@C3N4 nano-catalyst, and belongs to the technical field of chemistry and chemical engineering. The method comprises the steps that the prepared RhNiCo/CeO2@P@C3N4 nano-catalyst is placed into a reactor; the reactor is placed into an oil bath to be heated to a certain temperature; and then a mixed solution of the hydrazine hydrate and sodium hydroxide is added into the reactor for a reaction, and generated hydrogen is collected in a drainage mode. The RhNiCo/CeO2@P@C3N4 nano-catalyst is high in activity and selectivity. By adopting the nano-catalyst for the dehydrogenation reaction of the hydrazine hydrate, the dehydrogenation conversion rate and the selectivity are both at 100%, and the TOF value of the reaction is greater than 690h1.

Catalytic dehydrogenation method for hydrazine hydrate through RhNiCo/CeO2@P@C3N4 nano-catalyst

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