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Catalyst for preparing aromatic aldehyde and aliphatic aldehyde and its prepn process
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A technology for aromatic aldehydes and aliphatic aldehydes, which is applied to catalysts for preparing aromatic aldehydes or aliphatic aldehydes and the field of preparation thereof, can solve problems such as unification of selectivity, inability to achieve acid conversion rate and the like, achieve high selectivity and improve selectivity , high active effect
Inactive Publication Date: 2006-11-08
XIAMEN UNIV +1
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But all can't industrialized production because can't reach the unification of conversion rate of acid and the selectivity of aldehyde
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Embodiment 1
[0032] Embodiment 1: by MnO 2 : ZnO (molar ratio, the same below) are 1:9, 1:7, 1:6, 1:4, 1:2, 1:1, 2:1, 4:1, 6:1, 7:1 , 9:1 ratio and weigh the corresponding MnSO 4 (A.R) and ZnSO 4 (A.R), according to modifying elements: composite oxides are 0.02:1, 0.01:1, 0.05:1, 0.001:1, 0.03:1, 0.2:1, 0.1:1, 0.04:1, 0.003:1, 0.005 : 1, 0.15: 1 ratio to weigh the corresponding Cr 2 (SO 4 ) 3 , Put the three salts into the container and add deionized water until all the salts are dissolved.
[0033] According to the precipitating agent: composite oxide is 2:1, 1.2:1, 1.3:1, 1.9:1, 1.1:1, 1.8:1, 1.7:1, 1.6:1, 1.2:1, 1.5:1, 1.4 Measure a certain concentration of ammonia water in a ratio of : 1, put it in a suitable drop bottle, and then slowly drop it into the salt solution. At the same time, stir the salt solution to slowly precipitate the precipitate. After the precipitation was complete, the solution was allowed to stand, and the mother liquor was poured out, washed with deionized ...
Embodiment 2
[0034] Embodiment 2: replace the ammoniacal liquor of embodiment 1 with ammonium carbonate, oxalic acid respectively, precipitating agent: composite oxide is 1.2: 1, in the ammonium carbonate of above-mentioned calculated amount or oxalic acid, add deionized water until solid compound is all dissolved (dissolving When using oxalic acid, consider using hot water). All the other are with embodiment 1. The prepared catalysts are sequentially denoted as A 1 , B 1 、C 1 、D 1 ,E 1 , F 1 , G 1 、H 1 , I 1 、J 1 、K 1 (using ammonium carbonate as precipitant) and A 2 , B 2 、C 2 、D 2 ,E 2 , F 2 , G 2 、H 2 , I 2 、J 2 、K 2 (Using oxalic acid as a precipitating agent).
Embodiment 3
[0035] Embodiment 3: take ammonium carbonate as precipitation agent, FeCl 3 Be the salt of modification element, all the other are with embodiment 1, and the catalyst that makes is represented as A 1 ', B 1 ', C 1 ', D 1 ', E 1 ', F 1 ', G 1 ', H 1 ', I 1 'J 1 ', K 1 '.
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Abstract
Catalyst for preparing aromatic aldehyde or aliphatic aldehyde and preparation method thereof, involving a modified nano-MnO 2 Composed of ZnO composite oxide, a catalyst for preparing aromatic aldehyde or aliphatic aldehyde and a preparation method thereof. Provide a high specific surface area, high reactivity, high conversion rate to acid and high selectivity to aromatic aldehydes, low reaction temperature, long life, high-efficiency catalysts for the preparation of aromatic aldehydes or aliphatic aldehydes and their preparation methods, and for the preparation of aromatic aldehydes or fatty aldehydes. The steps are to add modification elements, dissolve, form a precipitate with a precipitant, and decompose the precipitate to obtain MnO 2 and ZnO composite oxide, extruded and calcined. Catalysts useful in the preparation of aromatic or aliphatic aldehydes are useful in the preparation of aromatic or aliphatic aldehydes. Use pressure or decompression to pass nitrogen reduction activation. It has high activity, high selectivity to aldehyde and long life.
Description
technical field [0001] The invention relates to a modified nano MnO 2 A catalyst composed of ZnO composite oxide, especially a catalyst for preparing aromatic aldehyde or aliphatic aldehyde and a preparation method thereof. Background technique [0002] Aromatic aldehydes or aliphatic aldehydes are important fine chemical raw materials and are widely used in food, pharmaceutical, toothpaste and cosmetic industries. At present, the production method of aromatic aldehydes, such as benzaldehyde, still follows the traditional method of first chlorination and then hydrolysis of toluene. The benzaldehyde produced by the method is restricted in its application in medicine, food and beverage industry due to chlorine. At the same time, the production method pollutes the environment due to the generation of a large amount of harmful gases. Therefore, finding a green process suitable for industrial production of aromatic aldehydes or aliphatic aldehydes has become the direction of e...
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