A kind of cu-nipo nano fiber material and its preparation method and application
A nanofiber, cu-nipo technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, organic compounds, etc., can solve the problems of high raw material cost, environmental pollution, etc., and achieve low equipment requirements, green process, high heat The effect of stability
Active Publication Date: 2020-07-14
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
[0005] The above-mentioned methods have effectively promoted the research and development of high-stability copper-based catalysts, but some of these methods require a high-pressure hydrothermal synthesis environment, some of which have high raw material costs, and some methods cause pollution to the environment. Therefore, the use of green and low-cost It is of great significance to prepare new catalysts with excellent catalytic activity and stability with safe and easy operation
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0023] In a 500ml three-neck flask, add choline chloride (28g) and urea (36g), melt at 80°C, continue to add 3.5g of 85% phosphoric acid, 2.91g of nickel nitrate hexahydrate, 0.48g of copper nitrate trihydrate, and 1.13g of ammonium fluoride , heated to 120°C for 12 hours, washed with water and ethanol, and filtered to obtain a green solid. Dry at 110°C to obtain Cu-NiPO nanofiber material (referred to as Cu-NiPO-Eut-1). The specific surface area is shown in Table 1.
Embodiment 2
[0025] Add 3.5g of 85% phosphoric acid, 2.91g of nickel nitrate hexahydrate, 2.42g of copper nitrate trihydrate, heat up to 180°C and react for 144h. Others are the same as in Example 1. The prepared Cu-NiPO nanofiber material is denoted as Cu-NiPO-Eut-2. The specific surface area is shown in Table 1.
Embodiment 3
[0027] Preparation of [Bmim]Br: In a 500ml three-necked flask, add 100g of N-methylimidazole and 250.4g of n-butane bromide, heat up to 40°C for 6 hours under stirring, cool to room temperature, and wash 5 times with ethyl acetate , and dried in vacuum to obtain about 227.15 g of [Bmim]Br.
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Abstract
The invention discloses a Cu-NiPO nano-fiber material and a preparation method and application thereof. The nano-fiber material is prepared from a copper compound, a nickel compound and a phosphoric acid or a hydrogen phosphate salt in a solvent such as an ionic liquid or an eutectic mixture by ionothermal synthesis under the conditions of 120 to 180 DEG C and normal pressure. The synthesis methodis operated at normal pressure, and is safe, simple and convenient, with low requirements for equipment. The catalyst has a specific morphology of nanofibers and has a higher specific surface area. The ester hydrogenation reactions can be carried out, especially dimethyl oxalate hydrogenation for ethylene glycol preparation. Based on the morphology effect of nanofibers, the dimethyl oxalate hydrogenation reaction shows higher catalytic performance; at the same time, due to the stronger interaction of Cu-carrier caused by the stronger interaction between Cu-Ni bimetals and the acidic surface properties of NiPO materials, copper species have higher thermal stability.
Description
technical field [0001] The present invention relates to the technical field of nanofiber catalysts, in particular to a highly stable Cu-NiPO nanofiber material and its preparation method and the catalyst in the reaction of ester hydrogenation (especially hydrogenation of dimethyl oxalate to synthesize ethylene glycol) application. Background technique [0002] The melting point of metallic copper is much lower than that of nickel, and its Hüttig temperature and Tamman temperature are lower, so the thermal stability of copper catalysts is far less than that of nickel catalysts. The movement of metal atoms at high temperature will lead to the aggregation and growth of small-sized nanoparticles with high dispersion, which in turn will cause a significant reduction in the active surface area of the catalyst and a significant reduction or even loss of catalytic activity. Therefore, the problem of poor stability of copper catalysts greatly limits its widespread use on an indust...
Claims
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IPC IPC(8): B01J27/185C07C29/149C07C31/20
CPCB01J27/1853C07C29/149C07C31/202Y02P20/52Y02P20/54
Inventor 赵鹬贠宏飞李宁高懂儒李贵贤
Owner LANZHOU UNIVERSITY OF TECHNOLOGY