Performance of ZnMn₂O₄/SiO₂ sorbent for high temperature H₂S removal from hot coal gas

Abstract

A spinel ZnMn 2 O 4 sorbent supported on SiO 2 was fabricated using a wetness impregnation method for high temperature desulfurization. The operating parameters including operating temperature, ZnMn 2 O 4 content, space velocity, gas composition, and multiple desulfurization/regeneration cycles were evaluated to understand the optimal condition. The ZnMn 2 O 4 /SiO 2 sorbent exhibits better desulfurization performance when operating temperature is controlled above 600 C and the suitable space velocity is between 5000-15 000 h À1. desulfurization. Through the EDS and TPR analyses, the residual sulfur was found in the regenerated sorbent and this sulfur species is sulfate from incomplete regeneration. A regeneration temperature of 700 C was the best choice to overcome the formation of metal sulfate.

Tea Garden Lateritic Soil as a High-Temperature Desulfurization Sorbent: Effect of Oxygen on Regeneration Process

“…It is reported that the Fe, Mn, Cu, Zn, and Co have the favorable thermodynamic property for high-temperature desulfurization [3][4][5][6]. In the past, we have investigated a great number of soil samples for hightemperature desulfurization, and some important information was proposed [10,11].…”

“…With a regression fitting analysis, the proportion of Al 6 is 82.4%, 75.8%, and 78.3% for fresh and both regenerated soil samples. e proportion of Al 4 significantly increased and that of Al 6 decreased after the regeneration reaction. e reasonable explanation of this finding is likely ascribed to the fact that coordination of aluminum underwent significant Journal of Chemistrychanges resulting from the dehydroxylation or the formation of aluminosilicate under strong exothermic reaction from the regeneration process [15,16].…”

“…One of the crucial criteria in the development of the HGD for IGCC and SOFC is the need for a high sulfur capacity, low overall cost, high utilization, eco-friendly, and regenerable sorbent [1,2]. Based on the investigation of previous studies, Fe, Cu, Zn, Mn, V, and Co oxides have been paid much attention because of their thermodynamic feasibility, reactivity, and regeneration property [3][4][5][6].…”

Recent Advances in Functionalized Mesoporous Silica Frameworks for Efficient Desulfurization of Fuels

“…Spinel phase oxides with the formula AB 2 O 4 (A and B are metals) are known for their high stability and diverse framework architectures. In particular, Zn-based spinel adsorbents (ZnB 2 O 4 ) with periodical [B 4 O 4 ] 4− cubical secondary building units have been reported to considerably subdue vaporization of zinc atoms during hot gas desulfurization when temperatures of the reactors were <600 • C and demonstrates the synergistic effects of ZnO as B 2 O 3 units on reaction with H 2 S in desulfurization steps [144][145][146]. Additionally, zeolites are high porosity green materials that can prevent sintering of active guest species and have been used in multiple applications, including ion exchange, catalysis, and gas adsorption [147][148][149][150][151].…”

Effect of lignite as support precursor on deep desulfurization performance of semicoke supported zinc oxide sorbent in hot coal gas

“…The porous supports mainly contain g-Al 2 O 3 , mesoporous silica, zeolite, and carbon materials. [21][22][23][24][25][26][27] Carbon materials including activated carbon and semicoke have attracted more and more researchers' attention due to their abundant pore structure and low cost. In comparison with activated carbon, semicoke is cheaper and more easily attained.…”