氢氧复合疏水催化剂Pt-SDB的制备

Preparation of the Hydrophobic Catalyst Pt-SDB of Hydrogen-Oxygen Combination

由于铂对氢氧复合反应的催化能力很强,在大浓度反应中可能产生热量积累,破坏载体结构及铂的分布进而导致爆炸等安全事故,自身能使催化反应平稳发生的疏水性催化剂在实际应用中意义重大。本文设计正交实验采用浸渍手段制备疏水性催化剂Pt-SDB (聚苯乙烯-二乙烯基苯),通过常温氢氧复合反应测试,研究浸渍液浓度、浸渍静置时间、干燥温度、干燥时间、还原温度、还原时间对制得催化剂样品催化反应程度和稳定性的影响顺序。挑取实验样品进行微观分析,结合正交实验结果发现催化剂催化反应稳定性依赖于载体的多孔结构。综合各方面考虑,确定了一组制备条件作为进一步研究的基础。

In the combination of hydrogen and oxygen, the catalytic performance of platinum is prominent. Heat can be accumulated in large-amount hydrogen-oxygen combinations, which will destroy the structure of carriers and the distribution of platinum, leading to accidents like explosion. So the hydrophobic catalyst which can catalyze hydrogen-oxygen combination smoothly is meaningful in practical applications. In this article, hydrophobic catalyst, Pt-SDB (polystyrene-divinyl benzene), is prepared by impregnation and an orthogonal experiment is performed. Tested by ambient- temperature hydrogen-oxygen combination, through the degree and stability of the combination, the effect order of precursor-concentration, standing-time, drying-temperature, drying-time, re-duction-temperature, and reduction-time to so-prepared catalyst is studied. Some samples are se-lected for microanalysis, which, combined with the results of orthogonal experiment, indicates that the ability to smooth the catalytic combination depends on the porous structure of the carrier. Taking every aspect into account, one series of preparation conditions is confirmed for further research.