ChemInform Abstract: Tetrafluorobromates for Urban Mining of Noble Metals: A Case Study on Iridium Metal.

ChemInform ◽  
2013 ◽  
Vol 44 (52) ◽  
pp. no-no
Author(s):  
Sergey Ivlev ◽  
Patrick Woidy ◽  
Florian Kraus ◽  
Ivan Gerin ◽  
Roman Ostvald
Keyword(s):  
Noble Metals ◽  
Urban Mining

Tetrafluorobromates for Urban Mining of Noble Metals: A Case Study on Iridium Metal

2013 ◽  
pp. n/a-n/a ◽  
Author(s):  
Sergey Ivlev ◽  
Patrick Woidy ◽  
Florian Kraus ◽  
Ivan Gerin ◽  
Roman Ostvald
Keyword(s):  
Noble Metals ◽  
Urban Mining

scholarly journals Towards Urban Mining—Estimating the Potential Environmental Benefits by Applying an Alternative Construction Practice. A Case Study from Switzerland

2020 ◽  
Vol 12 (12) ◽  
pp. 5041
Author(s):  
Efstathios Kakkos ◽  
Felix Heisel ◽  
Dirk E. Hebel ◽  
Roland Hischier
Keyword(s):  
Impact Category ◽  
Residential Building ◽  
Environmental Benefits ◽  
Experimental Unit ◽  
Building Stock ◽  
Urban Mining ◽  
Country Level ◽  
Residential Building Stock ◽  
Construction Practice

Modern cities emerged as the main accumulator for primary and waste materials. Recovery of both types from buildings after demolition/disassembly creates a secondary material stream that could relieve pressure from primary resources. Urban mining represents this circular approach, and its application depends on redefining current construction practice. Through the life cycle assessment (LCA) methodology and assuming primary resources as step zero of urban mining, this study estimates the impacts and benefits of conventional versus a circular construction practice applied to various buildings with different parameters and the country-level environmental potential savings that could be achieved through this switch in construction practice—using the increase of the residential building stock in Switzerland between 2012 and 2016 as a case study and key values from the experimental unit “Urban Mining and Recycling”, designed by Werner Sobek with Dirk E. Hebel and Felix Heisel and installed inside the NEST (Next Evolution in Sustainable Building Technologies) research building on the Empa campus in Switzerland. The results exhibit lower total impacts (at least 16% in each examined impact category) at building level and resulting benefits (i.e., 68–117 kt CO2-Eq) at country level over five years, which can be further reduced/increased respectively by using existing or recycled components, instead of virgin materials.

Origin of noble-metal nuggets in sulfide-saturated arc magmas: A case study of olivine-hosted sulfide melt inclusions from the Tolbachik volcano (Kamchatka, Russia)

Geology ◽  
2020 ◽  
Vol 48 (6) ◽  
pp. 620-624
Author(s):  
Vadim S. Kamenetsky ◽  
Michael Zelenski
Keyword(s):  
Noble Metals ◽  
Melt Inclusions ◽  
Basaltic Magma ◽  
Sulfide Liquid ◽  
Direct Crystallization ◽  
Arc Magmas ◽  
Tolbachik Volcano ◽  
Sulfide Melt ◽  
Significant Uptake

Abstract Minerals that contain platinum-group elements (PGEs) and occur in some magmatic Cu-Ni sulfide deposits have been ascribed to crystallization from an originally PGE-rich sulfide liquid. The occurrence of PGE-bearing minerals (PGMs) in some sulfide-undersaturated primitive melts has been envisaged and recently reported, whereas direct crystallization of PGMs in sulfide-saturated silicate magmas is seemingly hindered by strong partitioning of PGE into immiscible sulfide melts. In this study, we discovered abundant nanoparticles containing noble metals in association with sulfide melt inclusions entrapped inside primitive olivine phenocrysts (Fo85–92) from the recent basaltic magma of the Tolbachik volcano (Kamchatka arc, Russia). These nuggets occur in swarms on the surface of the sulfide globules and are represented by native metals, sulfides, and alloys of Pd, Pt, Au, Pb, and Bi. The nuggets on different globules can be either Pd- or Pt-rich nuggets, and the compositions are highly variable, even among adjacent nuggets. We argue that the diffusive supply of Pd from the external nuggets can be responsible for significant uptake of Pd (up to 2 wt%) in the sulfide melt. We consider direct crystallization of PGMs in a primitive basaltic melt undergoing sulfide unmixing, and possibly sulfide breakdown due to oxidation, as another mechanism additional to their “classic” origin from the PGE-rich sulfide melt in response to solidification.

Noble Metals Can Have Different Effects on Photocatalysis Over Metal-Organic Frameworks (MOFs): A Case Study on M/NH2-MIL-125(Ti) (M=Pt and Au)

2014 ◽  
Vol 20 (16) ◽  
pp. 4780-4788 ◽  
Author(s):  
Dengrong Sun ◽  
Wenjun Liu ◽  
Yanghe Fu ◽  
Zhenxing Fang ◽  
Fangxiang Sun ◽  
...  
Keyword(s):  
Noble Metals ◽  
Metal Organic Frameworks ◽  
Metal Organic

Intermetallic compounds with high hydrogen evolution reaction performance: a case study of a MCo2 (M = Ti, Zr, Hf and Sc) series

2019 ◽  
Vol 55 (96) ◽  
pp. 14406-14409 ◽  
Author(s):  
Peng Zhang ◽  
Huai-Guo Xue ◽  
Nian-Tzu Suen
Keyword(s):  
Intermetallic Compounds ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Noble Metals ◽  
High Price ◽  
High Hydrogen ◽  
Reaction Performance

Noble metals (e.g., Ru, Ir and Pt) or their derivatives exhibit very appealing activity toward the hydrogen evolution reaction (HER), but their high price and low reserves impede their wide use.

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