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Preparation and Catalytic Properties of Ru-based Ammonia Synthesis Catalyst

Author: GaoDongMei
Tutor: ZhuYiFeng;LiXiaoNian
School: Zhejiang University of Technology
Course: Industrial Catalysis
Keywords: Ruthenium Ammonia synthesis Preparation Active
CLC: TQ426
Type: Master's thesis
Year: 2004
Downloads: 112
Quote: 0
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Abstract


Ruthenium-based ammonia synthesis catalyst is considered to be the second generation of the fused iron catalyst for ammonia synthesis catalyst, its study has important significance in terms of the application of theoretical. While industrial production in foreign countries; However, due to technology patents, the preparation of the technical details of the ruthenium catalyst does not understand, at the same time there are some basic issues unresolved, such as the reaction mechanism, structure sensitive issues, carrier additives and maternal ruthenium the role, particularly the problem of the composition, the preparation conditions of the ruthenium catalyst and a catalytic reaction process needs further study. As the carrier activated carbon, barium, potassium additives prepared a series of catalysts, ruthenium-based ammonia synthesis catalyst preparation conditions and composition of the ruthenium catalyst activity have been greatly improved, important progress has been made. The main results are as follows: 1) dipping conditions of the active component ruthenium catalyst performance. Found using of RuCl 3 solution than the high dispersion of the acetone solution resulting catalyst ruthenium, activity. RuCl 3 dipping time best in more than 18h, impregnated with the number of active basically no effect. The pH of the solution a great impact on the performance of the catalyst should be controlled at between 0.4 and 1.0. After the to add competition adsorbent RuCl 3 aqueous solution, the catalyst activity (especially at low temperatures) have different degrees of decline. 2) to study the impact of drying time, temperature and drying methods on the performance of the catalyst. The results show that in the temperature range of 100 ~ 200 ℃ drying the catalyst sufficiently degassed, generally requires at least about 8 ~ 14h. The barium impregnated additives and active component ruthenium best drying temperature of 150 ℃ and 110 ℃ drying temperature impregnated Potassium basically no effect on the activity; impregnated RuCl 3 different drying methods, using different drying methods found in the same recipe and process its activity in order for the infrared drying> vacuum drying> Rotavapor> ordinary oven. 3) Study on the effect of the composition on the activity of the catalyst. The experimental results show that: the BA content of 4wt%, and the K content is 16wt%, the activity of the catalyst is preferably. Regardless of Which auxiliaries precursor, potassium and barium additives are ruthenium catalyst promoting agent also has some influence on its precursor. Barium precursor to promote the role of the order of Ba (NO 3 ) 2 > Ba (OH) 2 > BaCO 3 > BaCl 2 , Potassium Promoter: the KNO 3 KOH> K 2 CO 3 . Ba, K accelerator ruthenium catalyst system was further added, Co, have reduced the activity of the catalyst after Moisturizer. 4) RuCl 3 reducing conditions on the catalytic activity. The results show that the activity of the catalyst with the reduction temperature increased first decreased its optimum reduction temperature in the range of 200 ~ 300 ℃. The activity began to increase with the reduction of time extend long restoration will enable the ruthenium restore more fully. Up to 9 hours Zhejiang Industrial University, a master's degree thesis restore its activity is no longer increasing. The reducing gas airspeed also have a larger impact on the catalytic activity. When to restore gas airspeed for IOSOh one, when, the highest activity of the catalyst, too high or too low are not conducive to enhancing the catalytic activity. 5) the the ammonia washing and passivation step activity. Experiments found: RuC13 after reduction, the passivation step can be prevented surface of the catalyst due to the adsorption of hydrogen species and the case of the air sintering, can significantly improve the activity of the catalyst at lower temperatures. Washed with ammonia, before restoring the catalyst activity at low temperatures increased. Finally, a summary of the full text of the work as well as the outlook of nails based ammonia synthesis catalyst research.

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