The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform

Louise Olsson - One of the best experts on this subject based on the ideXlab platform.

  • layered pd ssz 13 with cu ssz 13 as pna scr dual layer monolith catalyst for nox abatement
    Catalysis Today, 2020
    Co-Authors: Aiyong Wang, Krishna Kamasamudram, Ashok Kumar, Louise Olsson
    Abstract:

    Abstract A concept of a layered Pd/SSZ-13 with Cu/SSZ-13 as PNA-SCR dual-layer monolith catalyst for NOx abatement is demonstrated. NO-TPD was employed for determining the NOx Storage, and the samples are characterized in detail using SEM-EDX, CO/NO-DRIFTS, XPS and H2-TPR. 750 °C hydrothermal treatment greatly promotes the NOx Storage capacity and the addition of CO promotes NOx Storage capacity and also shifts the NOx desorption temperature. The dual-layer sample (Pd/SSZ-13+Cu/SSZ-13) maintains most of the NOx Storage capacity while the NOx desorption temperature is modified due to Cu/SSZ-13 as the top layer. The layered sample work well for NH3-SCR reaction. Notably, for Pd/SSZ-13+Cu/SSZ-13, more than 80 % of the NOx trapped at low temperature (i.e., 80 °C) can desorb in the suitable SCR temperature region where NOx conversion higher than 80 % is found. However, some loss of NO Storage is found after SCR experiments. Overall, the dual-layer concept shows interesting potential for NOx abatement, but requires further developments on the PNA material to ensure Stable Storage capacity.

Eleanor R Tew - One of the best experts on this subject based on the ideXlab platform.

  • alternative afforestation options on sandy heathland result in minimal long term changes in mineral soil layers
    Forest Ecology and Management, 2021
    Co-Authors: Eleanor R Tew, Elena Vanguelova, William J Sutherland
    Abstract:

    Abstract Extensive afforestation is currently being widely promoted as a key nature-based solution for climate change mitigation. Fundamental to this strategy is the sequestration of carbon into long-term Stable Storage, either in wood products or the soil. However, the long-term effects of tree planting on soil carbon, or other soil properties, has rarely been examined. Importantly, afforestation can take many different forms, with differing effects on soil properties. Here, we evaluate how the historical afforestation of sandy heathland adopting a range of management options – including different combinations of conifers and broadleaves in monocultures and mixtures – have affected soil pH, total carbon and nitrogen concentrations, the C:N ratio, and carbon and nitrogen stocks almost a century later. We analyse these properties at a range of soil depths through the organic (litter, F and grass layers) and upper mineral (0–5 cm, 5–10 cm and 10–20 cm depth) soil layers. In comparison to the historical heathland sites, afforestation decreased soil pH, most dramatically under conifers, and increased the C:N ratio. However, there was overall little difference in carbon and nitrogen concentrations between alternative management options. While the total carbon and nitrogen concentrations were much higher in the organic layers of the forest options compared to the open sites, this did not translate into differences in the mineral layers. Furthermore, although we found some evidence of the transferral of carbon and nitrogen into the uppermost soil mineral layers, this was minimal in comparison to the concentrations of the organic layers. The soils at our study site are low quality and sandy, and are therefore unfavourable for incorporating organic matter, but it is still notable how little was incorporated after nearly a century of afforestation. Given the current emphasis on tree planting as a means to tackle climate change, these results demonstrate the fundamental importance of the appropriate consideration of both the afforestation management option and underlying soil type.

William J Sutherland - One of the best experts on this subject based on the ideXlab platform.

  • alternative afforestation options on sandy heathland result in minimal long term changes in mineral soil layers
    Forest Ecology and Management, 2021
    Co-Authors: Eleanor R Tew, Elena Vanguelova, William J Sutherland
    Abstract:

    Abstract Extensive afforestation is currently being widely promoted as a key nature-based solution for climate change mitigation. Fundamental to this strategy is the sequestration of carbon into long-term Stable Storage, either in wood products or the soil. However, the long-term effects of tree planting on soil carbon, or other soil properties, has rarely been examined. Importantly, afforestation can take many different forms, with differing effects on soil properties. Here, we evaluate how the historical afforestation of sandy heathland adopting a range of management options – including different combinations of conifers and broadleaves in monocultures and mixtures – have affected soil pH, total carbon and nitrogen concentrations, the C:N ratio, and carbon and nitrogen stocks almost a century later. We analyse these properties at a range of soil depths through the organic (litter, F and grass layers) and upper mineral (0–5 cm, 5–10 cm and 10–20 cm depth) soil layers. In comparison to the historical heathland sites, afforestation decreased soil pH, most dramatically under conifers, and increased the C:N ratio. However, there was overall little difference in carbon and nitrogen concentrations between alternative management options. While the total carbon and nitrogen concentrations were much higher in the organic layers of the forest options compared to the open sites, this did not translate into differences in the mineral layers. Furthermore, although we found some evidence of the transferral of carbon and nitrogen into the uppermost soil mineral layers, this was minimal in comparison to the concentrations of the organic layers. The soils at our study site are low quality and sandy, and are therefore unfavourable for incorporating organic matter, but it is still notable how little was incorporated after nearly a century of afforestation. Given the current emphasis on tree planting as a means to tackle climate change, these results demonstrate the fundamental importance of the appropriate consideration of both the afforestation management option and underlying soil type.

Aiyong Wang - One of the best experts on this subject based on the ideXlab platform.

  • layered pd ssz 13 with cu ssz 13 as pna scr dual layer monolith catalyst for nox abatement
    Catalysis Today, 2020
    Co-Authors: Aiyong Wang, Krishna Kamasamudram, Ashok Kumar, Louise Olsson
    Abstract:

    Abstract A concept of a layered Pd/SSZ-13 with Cu/SSZ-13 as PNA-SCR dual-layer monolith catalyst for NOx abatement is demonstrated. NO-TPD was employed for determining the NOx Storage, and the samples are characterized in detail using SEM-EDX, CO/NO-DRIFTS, XPS and H2-TPR. 750 °C hydrothermal treatment greatly promotes the NOx Storage capacity and the addition of CO promotes NOx Storage capacity and also shifts the NOx desorption temperature. The dual-layer sample (Pd/SSZ-13+Cu/SSZ-13) maintains most of the NOx Storage capacity while the NOx desorption temperature is modified due to Cu/SSZ-13 as the top layer. The layered sample work well for NH3-SCR reaction. Notably, for Pd/SSZ-13+Cu/SSZ-13, more than 80 % of the NOx trapped at low temperature (i.e., 80 °C) can desorb in the suitable SCR temperature region where NOx conversion higher than 80 % is found. However, some loss of NO Storage is found after SCR experiments. Overall, the dual-layer concept shows interesting potential for NOx abatement, but requires further developments on the PNA material to ensure Stable Storage capacity.

Shen Tang - One of the best experts on this subject based on the ideXlab platform.

  • enhanced dispersibility and dispersion stability of dodecylamine protected silver nanoparticles by dodecanethiol for ink jet conductive inks
    Applied Surface Science, 2014
    Co-Authors: Xueqin Zhou, Wei Li, Meilan Wu, Shen Tang
    Abstract:

    Abstract This work studied dodecylamine-protected silver nanoparticles modified by a small amount of dodecanethiol as the co-protective agent. Contents of the dodecanethiol and the protective agent capping on the surface of silver nanoparticles were analyzed using the method of oxygen flask combustion and a thermogravimetric analysis instrument. Results of electrical property determination and transmission electron microscopy indicate that certain amount of capping dodecanethiol can slow down the spontaneous sintering process of silver nanoparticles. When capping DDT content of silver nanoparticles is 1.70 wt%, 10 wt% suspensions are Stable under −18 °C and can be stored stably at room temperature as long as 120 days. Furthermore, the silver nanoparticle concentration could be increased to 20 wt% with a Stable Storage time of 60 days at room temperature. Finally, Stable polymer-free conductive inks with the silver nanoparticle concentration of 20 wt% were produced to fabricate patterns by ink-jet printing. The resistivity of the PI-supported patterns having been annealed at 130 °C for 10 min is 7.2 μΩ cm.