Leaching behavior of vanadium from spent SCR catalyst and its immobilization in cement-based solidification/stabilization with sulfurizing agent

Liu, Lijun; Wang, Lele; Xiang, Jun; Yang, Tao; Dai, Zhicheng; Qing, Mengxia; Xu, Kai; Su, Sheng; Xiang, Jun

doi:10.1016/j.fuel.2019.01.160

Cited by 28 publications

(15 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the combustion temperature was 1,300°C, the leaching of As and V from the bottom ash was greatly weakened because of the immobilization of As and V in bottom ash through combustion melting. Liu et al (2019) researched the leaching behaviors of V in spent SCR catalyst after cement stabilization/solidification to understand the potential leaching toxicity of V. The leaching concentration of V up to 13.79 mg/L indicated that the spent SCR catalyst had a great potential of V leaching. After solidifying the spent SCR catalyst with cement and curing for 28 days, the leaching concentrations of V decreased to 2.27 mg/L with a cement addition of 30% and to 0.14 mg/L with a cement addition of 70%.…”

Section: Recycling and Disposal Of Spent Selective Catalytic Reductiomentioning

confidence: 99%

Power production waste

Cai

Zhang

Liang

et al. 2020

Water Environment Research

View full text Add to dashboard Cite

The storage of large amount of power production waste occupies huge land resource; moreover, the stored or discarded waste may pollute the water environment through changing the water pH, releasing the trace and toxic elements even radioactive elements, and so on by leachate. Therefore, the recycling and disposal of power production waste are important and necessary. This paper reviews the research literatures published in 2019 on power generation waste from coal-fired and nuclear power plants, mainly including the recycling of fly ash and flue gas desulfurization gypsum in construction industry and environmental application, the recovery and immobilization of different metals from coal combustion products and selective catalytic reduction catalysts, and the treatment and disposal of radioactive elements from nuclear power plants.

show abstract

Section: Recycling and Disposal Of Spent Selective Catalytic Reductiomentioning

confidence: 99%

Power production waste

Cai

Zhang

Liang

et al. 2020

Water Environment Research

View full text Add to dashboard Cite

show abstract

“…Trimercapto-s-triazine trisodium salt (TMT) is an environmentally friendly agent that can chelate heavy metals with high thermal stability and much lower biological toxicity [11]. At present, S/S of heavy metal-contaminated sediments by chemical stabilizers and cement has been reported in many studies [12,13], but there are few systematic studies on the optimization of treatment conditions. Therefore, it is of great significance to investigate the feedstock ratio of compound curing agents to reduce the capacity increment ratio and treatment cost.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Solidification and Stabilization Efficiency of Heavy Metal Contaminated Sediment Based on Response Surface Methodology

Yang¹,

Li²,

Sun³

et al. 2022

Sustainability

View full text Add to dashboard Cite

Solidification and stabilization (S/S) by agents and stabilizers is an effective way to treat heavy metal-contaminated sediments. Optimization of curing condition is crucial to minimize the consumption of reagents on the base of effective S/S. In this work, the synergistic effects of cement and stabilizer on mechanical strength and leaching toxicity of contaminated sediments were investigated, and the S/S conditions were optimized using response surface methodology. On the basis of a single-factor test, multi-factor experiments were conducted to fit the relationship between the S/S effect of contaminated sediments and the amount of cement and stabilizer. The mechanism of stabilization was investigated by the results from the revised BCR method. The results indicate that the optimal curing conditions were 44.29% of cement content with 2.05% of trimercapto-s-triazine trisodium salt (TMT). After 28 days of curing, the compressive strength reached 2.07 MPa and the leaching concentrations of Cd, Cu, and Pb were 0.094 mg/L, 0.031 mg/L, and 0.173 mg/L, respectively, which met the requirement of in-situ resource recycling standard. The stability of heavy metals was significantly improved as a result of the removal of acid extractable fraction (15.58~69.92%) and an increase in the residual fraction (18.27~49.07%).

show abstract

“… 16 , 17 In addition, spent vanadium-based catalyst is classified as a detrimental solid waste, and its post processing is also costly. 18 , 19 …”

Section: Introductionmentioning

confidence: 99%

Stability Mechanism of Low Temperature C₂H₄–SCR with Activated-Carbon-Supported MnO_x-Based Catalyst

Liu

Zhao

et al. 2022

ACS Omega

View full text Add to dashboard Cite

Manganese-based catalysts have shown great potential for use as a hydrocarbon reductant for NO x reduction (HC-SCR) at low temperatures if their catalytic stability could be further maintained. The effect of CeO 2 as a promoter and catalyst stability agent for activated carbon supported MnO x was investigated during low temperature deNO x based on a C 2 H 4 reductant. The modern characterization technology could provide a clear understanding of the activity observed during the deNO x tests. When reaction temperatures were greater than 180 °C and with ceria concentrations more than 5%, the overall NO conversion became stable near 70% during long duration testing. In situ DRIFTS shows that C 2 H 4 is adsorbed on the Mn 3 Ce 3 /NAC catalysts to generate hydrocarbon activated intermediates, R-COOH, and the reaction mechanism followed the E-R mechanism. The stability and the analytical data pointed to the formation of stable oxygen vacancies within Ce 3+ /Ce 4+ redox couplets that prevented the reduction of MnO 2 to crystalline Mn 2 O 3 and promoted the chemisorption of oxygen on the surface of MnO x -CeO x structures. Based on the data, a synergetic mechanism model of the deNO x activity is proposed for the MnO x -CeO x catalysts.

show abstract

Leaching behavior of vanadium from spent SCR catalyst and its immobilization in cement-based solidification/stabilization with sulfurizing agent

Cited by 28 publications

References 35 publications

Power production waste

Power production waste

Optimization of Solidification and Stabilization Efficiency of Heavy Metal Contaminated Sediment Based on Response Surface Methodology

Stability Mechanism of Low Temperature C₂H₄–SCR with Activated-Carbon-Supported MnO_x-Based Catalyst

Contact Info

Product

Resources

About

Leaching behavior of vanadium from spent SCR catalyst and its immobilization in cement-based solidification/stabilization with sulfurizing agent

Cited by 28 publications

References 35 publications

Power production waste

Power production waste

Optimization of Solidification and Stabilization Efficiency of Heavy Metal Contaminated Sediment Based on Response Surface Methodology

Stability Mechanism of Low Temperature C2H4–SCR with Activated-Carbon-Supported MnOx-Based Catalyst

Contact Info

Product

Resources

About

Stability Mechanism of Low Temperature C₂H₄–SCR with Activated-Carbon-Supported MnO_x-Based Catalyst