Abstract
The present study aims to explore the physico-chemical structure evolution characteristic during Yangchangwan bituminous coal (YCW) gasification in the presence of iron-based waste catalyst (IWC). The catalytic gasification reactivity of YCW was measured by thermogravimetric analyzer. Scanning electron microscope–energy dispersive system, nitrogen adsorption analyzer and laser Raman spectroscopy were employed to analyze the char physico-chemical properties. The results show that the optimal IWC loading ratio was 5 wt% at 1000 °C. The distribution of IWC on char was uneven and Fe catalyst concentrated on the surface of some chars. The specific surface area of YCW gasified semi-char decreased significantly with the increase of gasification time. i.e., the specific surface area reduced from 382 m2/g (0 min) to 192 m2/g (3 min), meanwhile, the number of micropores and mesopores decreased sharply at the late gasification stage. The carbon microcrystalline structure of YCW gasified semi-char was gradually destroyed with the increase of gasification time, and the microcrystalline structure with small size was gradually generated, resulting in the decreasing order degree of carbon microcrystalline structure. IWC can catalyze YCW gasification which could provide theoretical guidance for industrial solid waste recycling.
Highlights
The catalyst is the core of F-T synthesis technology
The present study aims to explore the physico-chemical structure evolution characteristic during Yangchangwan bituminous coal (YCW) gasification in the presence of iron-based waste catalyst (IWC)
The carbon microcrystalline structure of YCW gasified semi-char was gradually destroyed with the increase of gasification time, and the microcrystalline structure with small size was gradually generated, resulting in the decreasing order degree of carbon microcrystalline structure
Summary
The catalyst is the core of F-T synthesis technology. The iron-based waste catalyst (IWC) was discharged in the form of slag and wax. There are many reports on the characteristics of coal char structure during gasification in the presence of alkali metals and alkaline earth metals (Li et al 2006; Liu et al 2017a; Gao et al 2017; Fan et al 2019; Bai et al 2019), but there are a few studies on the characteristics of coal char structure using iron-based catalysts, and most of the reports in the literature are carried out by using commercially available analytical reagents. Xu et al (2019) studied the characteristic of coal char structure and gasification reactivity under Na2CO3, FeCO3 and their composite catalysts and found that the coal char adsorption curve increased rapidly with 4 wt% FeCO3. At present, the effect of the coal char structure characteristics of loading iron-based catalyst on the gasification reactivity was reported based on analytical reagents, the systematic study on the physicochemical characteristics of coal char with loaded IWC is seldom reported. The aim is to deepen the understanding of the structure evolution mechanism of IWC as loading catalyst on the YCW char structure during gasification
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