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A technology of intermetallic compounds and oxides, which can be used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, preparation of organic compounds, etc. Changes and other problems to achieve the effect of eliminating hidden dangers of operation, improving stability and simple process
Pending Publication Date: 2021-12-14
TIANJIN UNIVERSITY OF TECHNOLOGY
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However, since the safe porous nickel of the present invention adopts a specific Ni / Al atomic ratio, the activity of the nickel-aluminum intermetallic compound may be deactivated due to surface morphology changes, proportional imbalances, and pore structure changes during the preparation of powder preparations. At the same time, the type, method and ratio of metal addition may also cause changes in the properties of nickel-aluminum intermetallic compounds, so it is necessary to explore a feasible preparation method of powder-type safe porous nickel
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Embodiment 1
[0022] Using nickel-aluminum atomic ratio of 1:9 as raw material, and adding different contents of Mo metal, refining into composite alloy, and crushing into 200-400 mesh metal powder, after phase stripping under different conditions, the metal oxide modified safe Porous nickel was used in the selective hydrogenation reaction of phenylacetylene, and the test results are listed in Table 1.
[0023]
[0024] It can be seen from Table 1 that during the powder preparation process, temperature, NaOH concentration and phase exfoliation time all have varying degrees of influence on the catalytic conversion and selectivity of safe porous nickel. The powder particles have a high degree of refinement. On the one hand, we hope to increase the surface roughness as much as possible to expose more alloyed surfaces to improve catalytic activity. On the other hand, we need to prevent surface transition oxidation from causing alloy ratio imbalance or surface pore structure collapse. Prelimi...
Embodiment 2
[0026] Using different ratios of nickel and aluminum raw materials (as shown in Table 1), and adding different contents of Mo metal, refining into alloys containing Ni, Al, and Mo, crushing into 200-400 mesh metal powder, and finally performing phase exfoliation ( 0.1M NaOH, 2.5h, 5℃) to remove excess Al, and metal Mo is oxidized in situ on the surface to form MoO 3 The specific surface area of the modified porous nickel catalyst (No. 2-6) is listed in Table 2.
[0027] Table 2
[0028]
Embodiment 3
[0030] Based on the Ni / Al atomic ratio of 1:9, and adding different metals (Fe, Cr, Co, La, Ce, Cu, Re, W, Nb), refining it into a composite alloy, crushing it into 200-400 mesh The metal powder was finally phase exfoliated (0.1M NaOH, 2.5h, 5°C) and in-situ oxidized to form a metal oxide-modified porous nickel catalyst (No. 7-18). The specific surface area is listed in Table 3.
[0031] Table 2
[0032]
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Abstract
The invention provides a metal oxide modified safe porous nickel catalyst and a preparation method thereof, and the catalytic activity, stability and selectivity of the porous nickel catalyst are improved through surface modification of a transition metal oxide. The transition metal oxide is subjected to in-situ oxidation through the phase stripping process of the composite alloy powder and covers the surface of the porous structure framework with the specific Ni / Al atomic ratio, and the oxide of the transition metal oxide comprises one or more of FeOx, Cr2O3, MoO3, CoOx, La2O3, CeOx, CuOx, ReOx, WO3 and Nb2O5. The catalyst provided by the invention has the advantages of simple preparation process, high activity and good stability, and can be widely applied to hydrogenation, dehydrogenation, isomerization, hydrodehalogenation and other reactions.
Description
technical field [0001] The invention belongs to the technical field of new material preparation and relates to a modification method of a safe porous nickel catalyst. Background technique [0002] Industrial Raney nickel (Raney Ni) catalysts are widely used in various catalytic reactions because of their high activity and low price. However, there are also hidden dangers in safe operation, and they are prone to spontaneous combustion in air. The applicant has therefore developed a safe porous nickel catalyst, by adopting a specific Ni / Al atomic ratio, forming a nickel-aluminum intermetallic compound (1:(3±0.5)) with a specific atomic ratio, and obtaining high activity and Catalytically selective strip catalysts. [0003] Although the obtained strip-type catalyst solves the safety hazard of traditional Raney nickel and obtains basically equivalent catalytic conversion performance, there is still a need for further improvement of the strip-type catalyst to enhance catalytic a...
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