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urea decomposition Method to Synthesize Hydrotalcites

Chinese Chemical Letters 2004年第1期15卷 90-92页

作者： PiaoPingYANG JianFengYU TongHaoWU GuoZongLIU TaeSunCHANG DongKooLEE DeugHeeCHO CollegeofChemistry JilinUniversityChangchun130023 AdvancedChemicalTechnologyDivision KoreaResearchInstituteofChemicalTechnologyJang-dongYusong-guTaejon305-343Korea

The urea decomposition property at high temperature has been used to control the pH value in the synthesis of layer compounds. The hydrotalcites of Mg-Al and Ni-Al with high crystallinity were synthesized by using th... 详细信息

关键词： Hydrotalcite-like compound urea decomposition control of pH value.

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Numerical Analysis of urea decomposition with Static Mixers in Marine SCR System

Numerical Analysis of Urea Decomposition with Static Mixers ...

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作者： Cheolyong Choi Yonmo Sung Gyung Min Choi Duck Jool Kim School of Mechanical Engineering Pusan National University

A numerical simulation for urea decomposition into ammonia with static mixers was performed for marine selective catalytic *** types of mixer were considered to improve urea into ammonia conversion *** effect of each mixer such as pressure drop,particle residence time,and uniform distribution of urea water solution was investigated using three dimensional CFD *** mixer regardless of a type was improved urea *** performance could be affected by high pressure drop caused by ***,the proper mixer should be chosen in permissible level of pressure drop as well as ammonia conversion rate.

关键词： Selective catalytic reduction(SCR) static mixer urea decomposition urea water solution(UWS)

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Thermodynamic　Stability　of　Ultrafine　Monodispersed　Colloidal　Particles　of　Basic　Yttrium　Carbonate

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Journal of Rare Earths 1994年第2期12卷 86-89页

作者：邓红梅徐燕顾翼东 Fudan Univ Shanghai China

A series of thermodynamic parameters in formation of ultrafine monodispersed colloidal particles of Y(OH)CO3 were measured, estimated and calculated. The thermodynamic stability of Y(OH)CO3 colloidal particles was studied and discussed by phenomenological model. It is suggested that ultrafine monodispersed colloidal particles of Y(OH)CO3 are stable only in a very narrow temporary supersaturation range ( 1

关键词： urea decomposition Monodispersed colloidal particles Y(OH)CO_3 Thermodynamic stability

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Studies on monodispersed colloidal particles of doped yttrium compounds

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Chinese Journal of Chemistry 1995年第3期13卷 199-206页

作者： DENG, HM XU, Y GU, YD FUDAN UNIV ANAL & MEASUREMENT RES CTRSHANGHAI 200433PEOPLES R CHINA FUDAN UNIV DEPT CHEMSHANGHAI 200433PEOPLES R CHINA

Monodispersed particles of doped yttrium basic carbonates were prepared at aging at elevated temperature corresponding salts solutions in the presence of urea. Coprecipitation in mixed solutions of yttrium, lanthanum and neodymium salts under similar experimental conditions yielded composite particles of basic carbonates. The content of the three metals in the solids followed closely the initial composition of the reacting solutions. On calcination all prepared solids converted to their corresponding oxides while retaining their particle morphology. The so-prepared powders were characterized by various techniques.

关键词： YTTRIUM COMPOUNDS MONODISPERSED PARTICLES urea decomposition

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