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Studies on Cu-zirconia Catalyst for Oxidation Dehydrogenation from Diethanolamine to Iminodiacetic Acid

Author: LiYanNi
Tutor: YangYuanFa
School: Zhejiang Normal University
Course: Physical and chemical
Keywords: Iminodiacetic acid (IDA) Cu/ZrO2 Catalyst Recycling Manganese , lanthanum additives
CLC: TQ225.14
Type: Master's thesis
Year: 2011
Downloads: 17
Quote: 0
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Abstract


Iminodiacetic acid (] [minodiacetic Acid IDA) is a widely used chemical intermediate, mainly used in the production of the herbicide glyphosate, Also used in the field of water treatment reagents, electroplating, pharmaceutical, rubber and metal processing In our country, there is a larger space for development. Iminodiacetic acid production are many ways in which the production process route through the oxidative dehydrogenation of diethanolamine iminodiacetic acid is easy to operate, clean pollution, less investment in equipment, low production costs, product yield, to achieve a truly green production. To achieve iminodiacetic acid green, high efficient production and improve the competitiveness of products in the market, the key is to choose efficient and stable catalysts, the oxidative dehydrogenation of diethanolamine imino diacetic acid catalyst has important scientific value. In this thesis, a study of the oxidative dehydrogenation of diethanolamine the modified Cu/ZrO2 and additives Cu/ZrO2 catalytic performance, its contents and the results are as follows: 1. Were prepared by co-precipitation a Cu/ZrO2 catalyst of catalyst circulation activity changes in the use of the process, as well as the reaction mass and reaction temperature on the performance of the catalyst circulation using. Means of XRD, SEM-EDS, N2 adsorption - desorption effects of structural characteristics and surface properties of the catalyst before and after reaction. The results show that the changes in the structure, the catalyst in the recycling process is a major factor to cause the decline of the catalytic activity. Reaction materials sodium hydroxide prompted metastable Zr02 carrier to tetragonal phase transition, exacerbated by the crystallization of the amorphous active metal Cu, thereby affecting the active component metal Cu-support interaction, to further accelerate the growth of Cu particles, resulting in decreased catalytic activity. Prepared with coprecipitation of the doped manganese, lanthanum Cu/ZrO2 catalyst, manganese and lanthanum additives on the catalytic diethanolamine oxidative dehydrogenation Cu/ZrO2 performance. Investigated by means of changes in the structure and surface properties of catalyst additives modified by XRD, TPR, N2O titration, N2 adsorption - desorption. The results showed that the catalyst specific surface area of ??the introduction of Manganese Promoter 105m2.g-1 increases to 143m2.g-1, the degree of dispersion of the active metal Cu increased from 36.5% to 53.6%; of La Promoter introduction block metal Cu gathering grew delaying the crystallization rate of the catalyst; manganese, lanthanum introduced together showed a synergistic effect, not only the degree of dispersion of the active Cu improved, but slow down the crystallization rate of the catalyst, thereby improving the performance of the catalyst recycling. Co different manganese and lanthanum content of Cu / Mn / La / Zr catalyst prepared by precipitation, and examine its impact on the catalytic performance in the oxidative dehydrogenation of diethanolamine, by means of XRD, H2-TPR, N2O titration characterization methods on The catalysts were characterized. The results show that the modified catalyst of manganese and lanthanum, manganese additive content of 2%, lanthanum additive content for the 3% CuMn2La3Zr catalyst circulation using the best performance. When the manganese content is increased from 2% to 5%, although the metal Cu dispersity significantly improved, metal Cu diameter significantly reduced, and the initial activity of the catalyst is high, but its activity dropped accelerate with the catalyst is recycled, the catalyst is recycled 15 the times significantly enhanced the degree of crystallization; lanthanum additive content increased from 3% to 5% of Cu metal dispersion and particle size, and the catalyst is recycled 15 times the degree of crystallization did not change significantly, the activity of the catalyst and recycling performance is no longer improved significantly.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic carboxylic acid and its derivatives > Fatty acids and their derivatives > Saturated dicarboxylic acid
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