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以SnO2催化臭氧化降解高浓度糖蜜酒精废水为探针反应,研究SnO2催化臭氧氧化降解糖蜜酒精废水的活性,并采用吸附吡啶的红外光谱研究SnO2及金属氧化物改性的SnO2催化剂表面的酸性.催化剂吸附吡啶的红外光谱表明:吡啶分子在SnO2表面吸附时,形成六元环振动峰1 449 cm-1,说明SnO2表面存在Lewis酸中心.掺入第二组分对SnO2进行酸性调变后,酸类型和酸中心发生了变化.CuO-SnO2催化剂表面仅存在L酸,NiO-SnO2,Fe2O3-SnO2及CoO-SnO2等的表面不仅存在L酸,还存在不同强度的B酸,且Fe2O3-SnO2与CoO-SnO2存在与SnO2不同的第二类L酸.水的存在使得NiO-SnO2,Fe2O3-SnO2及CoO-SnO2催化剂表面的L酸减弱,B酸强度增强;而CuO-SnO2表面出现了弱的B酸.将催化剂的酸类型与催化臭氧氧化活性进行关联,发现B酸的存在是造成催化剂活性降低的一个原因.
The reaction of SnO2 catalyzed ozonation to degradation of molasses alcohol wastewater by SnO2 catalytic ozonation was investigated. The surface of the SnO2 and the surface of the metal oxide-modified SnO2 catalyst was characterized by infrared spectroscopy. The infrared spectra of pyridine adsorbed on the catalyst showed that when the pyridine molecule adsorbed on the surface of SnO2, the vibration peak of the six-membered ring was 1 449 cm-1, indicating that Lewis acid was present on the surface of SnO2. After the second component was doped into SnO2, There are only L acid on the surface of CuO-SnO2 catalyst, and there are not only L acid on the surface of NiO-SnO2, Fe2O3-SnO2 and CoO-SnO2, but also B acid with different intensity, and Fe2O3-SnO2 Compared with CoO-SnO2, there is a second kind of L acid which is different from SnO2. The presence of water makes the L acid and the B acid of NiO-SnO2, Fe2O3-SnO2 and CoO-SnO2 catalysts weaken and the surface of CuO-SnO2 weak Of Brønsted acid B. The acid type of the catalyst is correlated with the catalytic ozone oxidation activity and it is found that the presence of Brønsted acid is one of the causes of the decreased activity of the catalyst.