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Study on the Preparation and Performance of Cu/ZrO2 Catalyst for the Dehydrogenation of Diethanolamine

Author: LuoAiWen
Tutor: DuanZhengKang
School: Xiangtan University
Course: Chemical processes
Keywords: Coprecipitation Cu/ZrO2 catalyst Diethanolamine Dehydrogenation Characterization
CLC: TQ426.94
Type: Master's thesis
Year: 2011
Downloads: 26
Quote: 0
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Abstract


Cu / ZrO 2 catalyst can be used in the CO, CO 2 Hydrogenation methanol steam reforming of methanol conversion hydrogen, nitrogen oxides (NO x < the degradation / sub>), the dehydrogenation of the amino alcohol amino acid and cyclohexanol dehydrogenation cyclohexyl ketone and the like during the reaction. 2 catalyst in the industrial production, the traditional methods of preparation of Cu / ZrO following deficiencies: large amount of catalyst loss, fast inactivation, long reaction time, the low reaction yield and selectivity. Therefore optimizing the catalyst preparation conditions is important. Papers in the extensive literature research and theoretical analysis based on Cu (NO 3 ) 2 · 3H 2 O and ZrOCl · 8H 2 O as raw material, the mass fraction of 20% sodium hydroxide as the precipitating agent, coprecipitation were prepared for diethanolamine dehydrogenation of iminodiacetic acid Cu / ZrO 2 catalyst, through a combination of orthogonal experiments and single-factor experiment to determine the coprecipitation prepared Cu / ZrO 2 catalyst optimized process conditions were as follows: n ( Zr): n (Cu) = 2:1, the zirconium salt initial concentration of 0.2 mol / L, step-by-step feeding methods, precipitated the end of the pH value of 12, the aging time of 5 h, the reduction time of 5 h. And obtained by single factor experiments investigated iminodiacetic acid sodium salt in diethanolamine dehydrogenation process conditions: M catalyst: M diethanolamine = 1:6, N sodium hydroxide: N diethanolamine = 2.4:1, and the reaction temperature is 165 ℃, the reaction pressure was 1.2 MPa. Fresh Cu / ZrO 2 catalyst for catalytic dehydrogenation of diethanolamine iminodiacetic sodium yield of 90.21%, 98.45% selectivity to be reused 10 times, an average of The yield was 84.09%, 95.93% average selectivity way inactivation rate 1% 3 %. The results showed that the prepared Cu / ZrO 2 catalyst has high activity and long life. Potentiometric titration of diethanolamine dehydrogenation product analysis method based on high performance liquid chromatography method of product analysis of the conditions to obtain the best chromatographic conditions: strong anion exchange column (Hypersil SAX 5μm 4.6 mm × 250 mm quantification. Iminodiacetic acid was measured by the best liquid chromatography analysis conditions to obtain a standard linear regression equation. Modern instruments, TG, TPR, BET, XRD and SEM analysis were used to characterize the physical and chemical properties of the catalyst precursor and finished. Homemade Cu / ZrO 2 catalyst has a specific surface area of ??73.919 m2 / g, pore volume of 0.170 mL / g, a pore size of 7.888 nm, a particle size of 10 8 0 nm.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst ) > Chemical Industry Catalyst
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