Different Preparation Process versus Performance of Mn_xO_y/MCM-48 Sorbents for Hot Coal Gas Desulfurization

Abstract

In order to improve the desulfurization efficiency of 50% Mn x O y /MCM-48 sorbent, the preparation parameters including synthesis method (excessive impregnation, precipitation, and sol–gel), precursor selection (Mn­(Ac)2 and Mn­(NO3)2), heating rate during calcination (2°/min, 4°/min, 6°/min, and 8°/min), and calcination temperature (450 °C, 550 °C, 650 °C, and 750 °C) of sorbents were investigated systematically. The structure and composition of different sorbents were characterized by XRD, BET, TG/DSC, H2-TPR, UV–vis, TPSR, and FT-IR techniques. The results indicated that synthesis methods and precursors influenced remarkably the dispersion of active particles while the stable structure of MCM-48 and the dispersion of active particles correlated closely with the heating rate during calcination and calcination temperature of sorbents, which will influence the desulfurization efficiency of sorbents. Therefore, the better dispersion of active particles and integrity of MCM-48 structure will result in better desulfurization performance of sorbents. Thus, the best condition was the calcination temperature of 550 °C with a heating rate of 2°/min using Mn­(Ac)2 as precursor by a sol–gel method.

Removal of Hydrogen Sulfide from Gas Streams Using Porous Materials: A Review

“…Huang et al . prepared a series of 50% Mn x O y /MCM-48 sorbents under different synthesis conditions to improve the desulfurization efficiency.…”

“…Manganese Oxide Loading. Huang et al 89 prepared a series of 50% MnxOy/MCM-48 sorbents under different synthesis conditions to improve the desulfurization efficiency. The results showed that the synthesis method and precursor type controlled the dispersion of active particles while the pore structure and specific surface area of MCM-48 depended on the heating rate and calcination temperature.…”

Structure Characteristics and Hot-Coal-Gas Desulfurization Properties of Zn-Based Sorbents Supported on Mesoporous Silica with Different Pore-Arrangement Patterns: A Comparison Study

“…As we all know, coal contains a small fraction of sulfur element present in the organic or inorganic form. Most of inorganic sulfur in coal could be removed during the coal washing process, while the remaining sulfur will be released to the coal gas and/or transferred to the solid coke during the gasification and coking processes . The aforementioned coal-derived gas can serve as the feedstock for chemical production and can be used as fuel gas for advanced power-generation systems such as the integrated gasification combined cycle (IGCC) and fuel cell.…”

“…The reaction between a metal oxide and H 2 S is a typical noncatalytic gas–solid reaction. , First, H 2 S diffuses from the gas phase to the outer surface of sorbents; then, H 2 S diffuses through the inner pores of sorbents to the surface of the active component; the following step is the transformation of metal oxide into metal sulfide together with the production of H 2 O; the last process is the diffusion of H 2 O from the interior of sorbents to the bulk gas phase. Apparently, the resistance caused by diffusion of H 2 S and H 2 O could not be ignored.…”

“…Most of inorganic sulfur in coal could be removed during the coal washing process, while the remaining sulfur will be released to the coal gas and/or transferred to the solid coke during the gasification and coking processes. 1 The aforementioned coalderived gas can serve as the feedstock for chemical production and can be used as fuel gas for advanced power-generation systems such as the integrated gasification combined cycle (IGCC) 2 and fuel cell. However, the coal-derived gas contains a sulfur-containing compound, mainly as H 2 S, and H 2 S has detrimental effects such as corrosion of blades in the gas turbine, poisoning of the anode catalyst in the fuel cell, and deactivation of the catalyst for catalytic synthesis of chemicals.…”