Active coke preparation method with polarity-oriented distribution of surface functional groups

Abstract

The invention discloses a preparation method of activated cokes with surface functional groups with directionally distributed polarities. The invention relates to a preparation method of activated cokes, which is designed for solving the problems that in the process of preparing activated cokes by using an existing gas activation method, the damage of micropores causes the reduction of the number of alkaline functional groups, and after an activation process is completed, the number of surface polar functional groups of mesopores and macropores is extremely low. The preparation method comprises the following steps: 1, crushing and screening weak caking coal; 2, carrying out air preoxidation treatment; 3, under the condition of air isolating, heating to 700-800 DEG C, so that a carbonized material is obtained; 4, carrying out preliminary activation by taking mixed gas of water vapor and O2 as an activator; 5, carrying out in-depth activation by taking CO2 as an activator, so that an activated coke is obtained; and 6, carrying out surface oxidation treatment. According to the preparation method disclosed by the invention, the directional distribution of polarities of surface functional groups in a pore structure is realized, and the activated coke of which the surfaces of micropores are rich in alkaline surface functional groups and a moderate amount of polar functional groups are distributed on the surfaces of mesopores and macropores is prepared.

Description

technical field [0001] The invention relates to a method for preparing active coke. Background technique [0002] The dry flue gas desulfurization technology using activated coke has the pollutant SO 2 It has the advantages of deep removal, resource utilization, less water consumption, and recyclable absorbent, etc., and has excellent development prospects. The activated coke desulfurization process uses its well-developed pore structure and surface functional groups to desulfurize SO in the flue gas. 2 , O 2 、H 2 O and other target gases are adsorbed and catalyzed, so that SO in the gas phase 2 converted to H 2 SO 4 , exists in the active coke pores in the liquid phase, and then undergoes H 2 SO 4 The recycling process realizes resource utilization and adsorbent regeneration. [0003] A core problem faced by the existing activated coke flue gas desulfurization technology is the occurrence of H 2 SO 4 The activated coke is desorbed and regenerated, which is a key ...

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the problem that the number of basic functional groups is reduced due to the destruction of micropores and the number of polar functional groups on the surface of mesopores and macropores is extremely low in the process of preparing active coke by the existing gas activation method, and provides a method for the polarity and directional distribution of surface functional groups Active coke preparation method

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