Method for removing hydrogen sulfide, hydrogen phosphide and arsenic hydride by using low-temperature plasma modified alumina-based catalyst

Abstract

The invention discloses a method for removing hydrogen sulfide, hydrogen phosphide and arsenic hydride by using a low-temperature plasma modified alumina-based catalyst, and belongs to the field of material preparation and air pollution prevention and control. The method comprises the following steps: immersing alumina particles into ultrapure water, carrying out ultrasonic pretreatment, and drying; grinding the dried aluminum oxide particles into powder, carrying out metal loading on the aluminum oxide powder by adopting a rotary evaporator, drying, and then roasting the dried sample by using a microwave muffle furnace; tabletting, grinding and screening the roasted sample, and modifying under a certain condition by using low-temperature plasma. Compared with a traditional modification method, the low-temperature plasma modification catalyst can achieve high-functionalization and high-added-value surface treatment, equipment is simple, the operation process does not have harmful effects on the environment, the modification time is short, and the method is an energy-saving and pollution-free clean type environment-friendly technology; and the alumina-based catalyst modified by the low-temperature plasma has a good removal effect on hydrogen sulfide, hydrogen phosphide and arsenic hydride gas.

Description

technical field [0001] The invention relates to a low-temperature plasma modified alumina-based catalyst for removing H 2 S.PH 3 , AsH 3 The method belongs to the fields of material preparation and air pollution prevention and control. Background technique [0002] my country is a big country in metal smelting, and Yunnan Province is rich in mineral resources. In the process of metal smelting and processing, submerged arc furnace exhaust gas will inevitably be produced. The tail gas is rich in high concentration CO (85%-90%). CO can not only Used as fuel, it can also be used to produce methanol and phosgene and organic synthesis, etc., but if the tail gas is discharged in the form of "lighting sky lanterns", it will cause CO 2 The emissions are as high as 1.88 million t / a, which will damage the ecological environment and cause a great waste of resources. However, due to the complexity of the impurity gases in the tail gas of submerged arc furnaces, it is difficult to util...

AI Technical Summary

Problems solved by technology

Acid-base modification means that the catalyst is treated with acid or alkali to obtain the required acidic or basic functional groups on the surface of the catalyst. Although this method can improve the activity of the catalyst, the treatment process is complicated and time-consuming, and it is easy to cause secondary environmental pollution. Metal modification is to load different kinds of metals on the surface of the catalyst to achieve the purpose of improving the activity of the catalyst. Although this method can greatly improve the performance of the catalyst, the price of metal loading is high and it is easy to cause waste. Compared with these two methods, Low-temperature plasma modified catalyst technology has high efficiency and no pollution, and has great development potential in the catalyst industry in the future

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