Catalytic Behavior of Potassium Vapor on Coke Gasification Reaction

Abstract

Two types of coke are penetrated by different content of potassium (K) vapor using potassium-adsorption experiments. The K content of the alkalized coke is analyzed with inductively coupled plasma atomic emission spectrometry (ICP-OES). In order to explore the influence mechanism of K on the coke gasification, the industrial properties of alkalized coke samples are tested with standard method, while their gasification process is investigated by thermogravimetric analysis. It is found that the broken degree of coke structure after penetration by K vapor increases with the increase of K content, and a critical value near 5 wt% of K content may exist for the formation of coke fragment. The catalysis of K on coke gasification accelerates with the increase of K content, and reaches the limitation when the content of K exceeds 3.5 wt%. The catalysis of K vapor on coke gasification is mainly characterized by the reduced gasification temperature and the increased pre-exponential factor, which will increase the active carbon sites.

Influence of Zinc on Nonisothermal Gasification Kinetics of Coke in a Blast Furnace

“…5−8 Gas permeability and liquid permeability determine the smooth operation and output of the blast furnace. 9,10 Therefore, the supporting role of coke in a blast furnace is particularly important.…”

“…It can be used as a heating agent to provide heat for ironmaking, reducing agent to reduce iron ore, carburizing agent for increasing the carbon content in the hot metal, and framework to support the burden. − The role of coke in the first three aspects can be partially replaced by pulverized coal. However, it supports the burden and provides a porous layer as pillar framework, which is the unique characteristic of coke. − Gas permeability and liquid permeability determine the smooth operation and output of the blast furnace. , Therefore, the supporting role of coke in a blast furnace is particularly important.…”

Designed graphite with an activated edge for fast-charging lithium-ion storage properties

“…12,13 In this strategy, however, it is worth noting that potassium hydroxide molecules are specifically attracted to the oxygen vacancy sites on the acid-treated graphite and the gas produced (C + KOH → CO 2 + K + H 2 O) in a reducing atmosphere during the sintering process can be incorporated into the bulk graphite and expand the layer spacing. In addition, the violent gasification of unevenly distributed potassium at high temperature simultaneously caused extra stress to bend the surface edge, 14 thus constructing a modified structure with an activated edge.…”