摘要
采用混合法制备用于吸附制冷过程的复合吸附剂 ;用静态法和真空重量法测定水或乙醇在自制复合吸附剂上的平衡吸附量 ;用热分析天平测定了复合吸附剂的脱水或脱乙醇的DTA曲线峰端温度。以平衡吸附量和DTA曲线峰端温度作为考核指标 ,通过正交实验优化自制复合吸附剂原料配比。优化结果为 :以硅胶 (M4 )、氯化锶 (M1 0 )和凹凸棒土 (M3)等为主要吸附材料的复合吸附剂 ,最适宜配比为 :M1 0 - 4 0 % ,M3- 2 0 % ,M4 - 2 0 % ,其它 2 0 % ,扩孔剂 -E2。水在复合吸附剂M4 - 0 1 32上的吸附量约为 1 3x的 2～ 3倍 ;乙醇在M1 - 0 0 0 1上的平衡吸附量约为活性炭2 .5～ 4倍。以吡啶为探针分子 ,用TG -DTA -DTG分析法分析吸附剂的复合现象及吸附机理。探讨结果表明 :增加复合吸附剂弱吸附中心数 。
Composite absorbents for absorption refrigeration were produced by using mixed method. Equilibrium adsorption capacities of self-prepared composite adsorbents for water or alcohol were determined through static method and vacuum gravimetric method. Desorption peak temperature of DTA curve of the composite adsorbents for water or alcohol were analyzed by thermobalance. Equilibrium absorption capacities and peak temperature were selected as check targets, mixing proportion of the composite adsorbents were optimized through orthogonal design experiment. The optimized result shows: Silica gel (M4)、 strontium chloride (M10) and concavo-convex earth are chosen as main adsorption materials, the optimal mixing proportion of composite absorbent is: M10-40%, M3-20%, M4-20%, others-20% and pore size expander-E2. Equilibrium absorption capacity of composite adsorbent of M4-0132 for water is 2～3 times that of 13x; and composite adsorbent of M1-0001 for alcohol is 2.5～4 times that of activated carbon. phenomenon and adsorption mechanism of composite adsorbents were analyzed through TG-DTA-DTG method with pyridine as probe molecularPreliminary research for adsorption mechanism shows that: Desorption temperature is obviousely lowered with increase of numbers of weak adsorption centers.
出处
《制冷学报》
CAS
CSCD
北大核心
2004年第2期30-34,共5页
Journal of Refrigeration
基金
江苏省应用基础项目 (BJ970 67)
关键词
复合吸附剂
吸附制冷
热分析天平
DTA曲线
吸附机理
原料配比
Pyrology,absorption refrigeration,composite absorbent,proportion optimizing,thermal analysis,absorption mechanism
