Method for preparing transitional metal ion Co modified adsorbent for purifying low-concentration phosphine

Abstract

The invention relates to a method for preparing transitional metal ion Co modified adsorbent which is used for purifying low-concentration phosphine and mainly used for removing low-concentration phosphine in industrial production tail gas, belonging to the technical field of application of adsorption separation technique in atmospheric pollution purification. The method comprises the following steps of: (1) carrying out ultrasonic washing and drying treatment to an adsorbing material carrier until a constant-weight carrier is formed; (2) selecting a soluble cobalt salt to carry out ultrasonic immersing modification to the pretreated adsorbent carrier; (3) washing and drying the immersed adsorbent carrier; and (4) roasting the dried adsorbent carrier, and reducing the temperature to room temperature. The adsorbent prepared in the invention is unnecessary to add accelerating agents, such as noble metals or high-contamination heavy metals and the like; when the adsorbent is used for adsorbing waste gas containing phosphine, the adsorption is conducted by the surface of the modified adsorbent; waste gas dephophorization can be realized after the adsorption is saturated; and the adsorption activity is higher within in a certain temperature range.

Description

1. Technical field

[0001] The invention relates to a preparation method of a transition metal ion Co modified adsorbent for purifying low-concentration phosphine, which is mainly used for removing low-concentration phosphine in industrial production tail gas, and belongs to adsorption separation technology applied to air pollution purification technology field. 2. Technical background

[0002] Phosphine gas is present in certain concentrations in the gases produced in the processes of yellow phosphorus preparation, magnesium powder preparation, sodium hypophosphite production, acetylene production, feed fermentation, grain fumigation, and semiconductor industry production. Direct discharge of phosphine gas in the tail gas into the atmosphere will cause environmental pollution and endanger human health. If the phosphine-containing tail gas, especially the yellow phosphorus tail gas rich in CO, is utilized, the catalyst will be poisoned due to the presence of phosphine gas, w...