Method for preparing metal and highly dispersed metal catalyst assisted by carboxyl-containing organic matter
A highly dispersed and organic technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as high viscosity and complex catalyst preparation process
Active Publication Date: 2015-11-18
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Problems solved by technology
However, using this sol-gel method, the preparation process of the catalyst is too complicated
Moreover, due to the relatively high viscosity of the sol precursor after chelation of citric acid and metal cations, it cannot completely diffuse into the pores of the carrier core, resulting in the prepared metal can only be loaded on the surface of the carrier, forming a core-shell structure ,like figure 1 shown
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[0021] Preparation of metals, alloys / composite oxides: select one or more of the above 1 containing metals, noble metals and alloys (such as Cu, Ag, Au, Ni, Pt, Pd, Co, Rh, Ir, Fe, Ru) precursor salts and one or more salt precursors containing K, Ca, Ti, V, Cr, Mn, Zn, Zr, Al, Y, Mo and La, Ce and other lanthanide rare earth elements The body needs to be physically mixed according to different molar ratios. After being uniformly ground at room temperature, it is mixed with organic acids containing carboxyl groups (such as formic acid, acetic acid, propionic acid, oxalic acid, citric acid, glycine, EDTA, or amino acids, etc.) ) Or glucose (cellulose) physically mixed according to the molar ratio of 1 / 1 to 1 / 3, using ammonia water to adjust the pH value in the range of 1.0-7.0. The powdery precursor formed after drying at 120°C for 10 hours, in an inert atmosphere (such as argon) Or nitrogen) conditions, the temperature range is 300-500°C (Cu, Ag, Au precursor firing temperature ...
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A carboxyl containing organic matter assisted preparation method for metal and high-dispersion metal catalyst relates to a preparation method for high-dispersion supported nanometer metal catalyst, and includes the steps of preparing metal and corresponding alloy, preparing metal, alloy / composite oxide, and preparing high-dispersion metal, alloy / carrier supported metal catalyst. The whole preparation process does not generate waste water, and is environment-friendly. When metal salt and an organic acid chelate precursor containing carboxyl is resolved under the condition of inert atmosphere, reducing gases are released slowly, such as CH4, CO and H2, the reducing gases can reduce metal cations in a chelate as in-situ reducing agent to directly obtain pure metal and alloy, an extra reducing process is not needed, and energy is saved. High-dispersion metal Co / SiO2 catalyst prepared through the method is applied to Fischer-Tropsch synthesis reaction, and the reactivity of the high-dispersion metal Co / SiO2 catalyst prepared through the method is four times as high as that of the high-dispersion metal Co / SiO2 reducing catalyst prepared through a traditional dipping method.
Description
Technical field [0001] The invention relates to a method for preparing a highly dispersed supported nano metal catalyst, in particular to a method for assisting the preparation of metal and a highly dispersed metal catalyst by an organic substance containing carboxyl groups. Background technique [0002] For the first time in the existing literature, a new sol-gel method involving citric acid was reported for the direct preparation of metallic Cu / ZnO catalysts and highly dispersed metallic Co / SiO in one step 2 Supported catalyst without additional reducing conditions. The prepared metal Cu / ZnO and Co / SiO 2 The catalyst is directly used in low-temperature methanol synthesis and Fischer-Tropsch synthesis reaction. (Document: 1.StudyonthepreparationofCu / ZnOcatalystbysol-gelauto-combustionmethodanditsapplicationforlow-temperaturemethanolsynthesis. L.Shi ,K.Tao,R.Q.Yang,F.Z.Meng,C.Xing,N.Tsubaki,AppliedCatalysisA:General401(2011)46-55;2.Surfaceimpregnationcombustionmethodtopreparenano...
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IPC IPC(8): B22F9/22B01J37/16B01J23/75
Inventor 石磊椿范立肖林久
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY