CePO₄ Catalyst for Elemental Mercury Removal in Simulated Coal-Fired Flue Gas

Abstract

In this study, CePO 4 catalyst (referred as Ce-P-O) was for the first time employed to capture elemental mercury (Hg 0 ) under a simulated coal-fired flue gas condition. As compared with commercial SCR catalyst (i.e. V-W-Ti), the Ce-P-O catalyst had showed a much better performance in Hg 0 removal. The high Hg 0 adsorption capacity, abundant active oxygen species and excellent SO 2 poisoning resistance were account for such performance for Ce-P-O catalyst. After subjected to individual flue gas component conditions, it was found that the presence of NO can significantly improve the Hg 0 removal efficiency over the Ce-P-O catalyst whilst the HCl however did not show promotion effect as expected. The former was proposed due to the generated NO 2 (originated from NO oxidation) could react with Hg 0 ad-species (e.g. Hg 2 O), regenerating the HgO and hence enhancing the Hg 0 chemisorption. The latter was found owning to the absence of Deacon reaction over the catalyst.

Simultaneous removal of NO and Hg0 using Fe and Co co-doped Mn-Ce/TiO2 catalysts

“…CePO4 catalyst was employed to capture elemental mercury and showed much better performance in Hg 0 removal compared with a commercial SCR catalyst [21]. The CePO4 catalyst promoted the formation of nitrogen dioxide (NO2) from NO oxidation.…”

“…The CePO4 catalyst promoted the formation of nitrogen dioxide (NO2) from NO oxidation. And NO2 was effective to react with Hg 0 ad-species (e.g., Hg2O) [21]. LaMnO3 perovskite oxide was chosen to remove Hg 0 .…”

Ordered Monolayer Gold Nano-urchin Structures and Their Size Induced Control for High Gas Sensing Performance

“…One of the most important chemical sensing applications that is currently sought-after by the scientific community around the world are mercury sensors 27 28 29 30 31 32 33 . Among the different species of mercury, elemental mercury (Hg 0 ) vapor represents 66–94% of emitted from anthropogenic sources 34 35 . The urgency of detecting Hg 0 vapor from anthropogenic emission sources arises from the fact that the toxin can settle in oceans, convert to its deadliest form ( i.e.…”

A Nanoengineered Conductometric Device for Accurate Analysis of Elemental Mercury Vapor

“…1−4 In fact, a UNEP treaty 5 signed by 140 countries in 2003 states that, each country must maintain restriction on the amount of mercury emitted by their large industrial sources such as mining and coal-fired power plants. Among different species of mercury, the gaseous elemental (Hg 0 ) form is of particular interest as it represents 66−94% of anthropogenic air emissions, 6,7 is hard to detect/remove and can convert to more toxic forms. 8 In recent years, research has been more focused on development of cheap and robust micro/nanoengineered Hg 0 vapor sensors for industrial applications.…”

“…The interest in developing high-performance sensors for online mercury (Hg) detection is ever growing as government and environmental bodies around the world are introducing new and more stringent regulations in order to decrease anthropogenic mercury emissions and thereby reduce the adverse effects the toxin has on the environment and public health. − In fact, a UNEP treaty signed by 140 countries in 2003 states that, each country must maintain restriction on the amount of mercury emitted by their large industrial sources such as mining and coal-fired power plants. Among different species of mercury, the gaseous elemental (Hg 0 ) form is of particular interest as it represents 66–94% of anthropogenic air emissions, , is hard to detect/remove and can convert to more toxic forms . In recent years, research has been more focused on development of cheap and robust micro/nanoengineered Hg 0 vapor sensors for industrial applications.…”