Is the role of precious metals as precious as they are? A vine copula and BiVaR approaches

2021 ◽  
Vol 73 ◽  
pp. 102140
Author(s):  
Marwa Talbi ◽  
Rihab Bedoui ◽  
Christian de Peretti ◽  
Lotfi Belkacem
Keyword(s):  
Precious Metals ◽  
Vine Copula

How to make Russia a prosperous industrial country (about the role of the oil production and refining complex)

2020 ◽  
pp. 22-28
Author(s):  
Yu. Kanataev
Keyword(s):  
Precious Metals ◽  
Oil Production ◽  
Industrial Country ◽  
Industrial Scale ◽  
Deep Processing ◽  
Domestic Technology ◽  
Petrochemical Complex ◽  
Russian Economy ◽  
Further Development

The author, head of the Association of science-intensive enterprises having great experience in exploration of oil, precious metals, etc. in Russia and abroad (Austria, China, Israel, Ethiopia), first implemented on an industrial scale deep processing of oil using domestic technology, discusses the problems of further development of the Russian economy through the prism of their solutions to the main industries — oil and petrochemical complex.

scholarly journals A Phenomenological Study on the Synergistic Role of Precious Metals and the Support in the Steam Reforming of Logistic Fuels on Monometal Supported Catalysts

2010 ◽  
Vol 2010 ◽  
pp. 1-15 ◽  
Author(s):  
Abdul-Majeed Azad ◽  
Desikan Sundararajan
Keyword(s):  
Steam Reforming ◽  
High Efficiency ◽  
Phenomenological Study ◽  
Supported Catalysts ◽  
Precious Metals ◽  
Sulfur Poisoning ◽  
Jet Fuels ◽  
Hydrogen Yield ◽  
High Hydrogen

Clean power source utilizing vast logistic fuel reserves (jet fuels, diesel, and coal) would be the main driver in the 21st century for high efficiency. Fuel processors are required to convert these fuels into hydrogen-rich reformate for extended periods in the presence of sulfur, and deliver hydrogen with little or no sulfur to the fuel cell stack. However, the jet and other logistic fuels are invariably sulfur-laden. Sulfur poisons and deactivates the reforming catalyst and therefore, to facilitate continuous uninterrupted operation of logistic fuel processors, robust sulfur-tolerant catalysts ought to be developed. New noble metal-supported ceria-based sulfur-tolerant nanocatalysts were developed and thoroughly characterized. In this paper, the performance of single metal-supported catalysts in the steam-reforming of kerosene, with 260 ppm sulfur is highlighted. It was found that ruthenium-based formulation provided an excellent balance between hydrogen production and stability towards sulfur, while palladium-based catalyst exhibited rapid and steady deactivation due to the highest propensity to sulfur poisoning. The rhodium supported system was found to be most attractive in terms of high hydrogen yield and long-term stability. A mechanistic correlation between the role of the nature of the precious metal and the support for generating clean desulfurized -rich reformate is discussed.

Physicochemical approaches to gold and silver work, an overview: Searching for technologies, tracing routes, attempting to preserve

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Maria F. Guerra
Keyword(s):  
Atmospheric Corrosion ◽  
Raw Materials ◽  
Precious Metals ◽  
Gold Alloys ◽  
Exchange Networks ◽  
Trade Routes ◽  
Physicochemical Methods ◽  
Corrosion Mechanisms ◽  
Challenging Question

Abstract Gold alloys and silver alloys have always been widely employed in the production of significant objects. With high reflectivity, precious metals are perceived as both materials and colours, and can be skilfully combined to produce metallic polychrome effects. Because their structure and composition contain information on their manufacture, use, disclaim and degradation, items in gold and in silver enclose major information on the technologies employed by past societies and on exchange networks. This information can be acquired using appropriate analytical protocols, established according to the nature of the query and the characteristics of the objects. By using physicochemical techniques, it is possible to identify the technologies, materials and tools used by the artisan and, in particular cases, to situate the sources of raw materials and the workshops producing the objects, as well as to follow the trade routes. The aim of this work is to outline major achievements in the study of goldwork and silverwork based on the different physicochemical methods that are available, and to refer the analytical difficulties that have to be faced when studying objects made from precious metals. Based on several examples, three topics are addressed. The first concerns the major role of the techniques of exam when describing shaping, decorating, assembling and finishing; the second considers the search for metallic polychrome effects in some cultural areas; and the third discusses the challenging question of fingerprinting. A fourth section is dedicated to a short reflection on the difficulties related to the identification of the atmospheric corrosion mechanisms of precious metals.

scholarly journals A Phenomenological Study on the Synergistic Role of Precious Metals in the Steam Reforming of Logistic Fuels on Trimetal-Supported Catalysts

2010 ◽  
Vol 2010 ◽  
pp. 1-12 ◽  
Author(s):  
Abdul-Majeed Azad ◽  
Desikan Sundararajan
Keyword(s):  
Steam Reforming ◽  
Precious Metal ◽  
Noble Metals ◽  
Phenomenological Study ◽  
Supported Catalysts ◽  
Precious Metals ◽  
Jet Fuels ◽  
Metal Loading

Fuel processors are required to convert sulfur-laden logistic fuels (jet fuels, diesel, and coal) into fuel cell quality hydrogen-rich reformate with little or no sulfur for extended periods. Sulfur poisons and deactivates the reforming catalyst, therefore, sulfur-tolerant catalysts ought to be developed. In this paper, the development, characterization, and evaluation of a series of nanoscale ceria-supported reforming catalysts containing three noble metals in low concentration (1 wt% ≤ total metal loading ≤ 1.33 wt%) for the steam-reforming of kerosene (a JP-8 surrogate) are reported. Their performance is quantified in terms of H2yield, tolerance towards sulfur in the fuel, and the on-stream stability and compared with that of monometal and bimetal analogs under identical conditions. Due to the inherent cooperative synergy, a trimetal catalyst was found far superior to its mono- and bimetallic analog containing same amount of the precious metal loading in terms of quality of the reformate (measured by H2level in steady-state) as well as the catalyst longevity on-stream prior to deactivation. At the same time a mechanistic correlation between the distinct role of a given precious metal and the extent of its loading in each of the formulations and quality of the corresponding desulfurized H2-rich reformate was discovered.

scholarly journals A Phenomenological Study on the Synergistic Role of Precious Metals in the Steam Reforming of Logistic Fuels on Bimetal-Supported Catalysts

2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Abdul-Majeed Azad ◽  
Desikan Sundararajan
Keyword(s):  
Steam Reforming ◽  
Noble Metals ◽  
Phenomenological Study ◽  
Hydrogen Generation ◽  
Bimetallic Catalyst ◽  
Supported Catalysts ◽  
Precious Metals ◽  
Weight Percent ◽  
Sulfur Tolerance

Fuel processors are required to convert sulfur-laden logistic fuels into hydrogen-rich reformate and deliver to the fuel cell stack with little or no sulfur. Since sulfur poisons and deactivates the reforming catalyst, robust sulfur-tolerant catalysts ought to be developed. In this paper, the development, characterization and evaluation of a series of reforming catalysts containing two noble metals (with total metal loading not exceeding 1 weight percent) supported on nanoscale ceria for the steam-reforming of kerosene is reported. Due to inherent synergy, a bimetallic catalyst is superior to its monometallic analog, for the same level of loading. The choice of noble metal combination in the bimetallic formulations plays a vital and meaningful role in their performance. Presence of ruthenium and/or rhodium in formulations containing palladium showed improved sulfur tolerance and significant enhancement in their catalytic activity and stability. Rhodium was responsible for higher hydrogen yields in the logistic fuel reformate. Duration of steady hydrogen production was higher in the case of RhPd (75 h) than for RuPd (68 h); hydrogen generation was stable over the longest period (88 h) with RuRh containing no Pd. A mechanistic correlation between the characteristic role of precious metals in the presence of each other is discussed.

Price Discovery in precious metals market: A study of Gold

GIS Business ◽  
2018 ◽  
Vol 13 (6) ◽  
pp. 13-20
Author(s):  
Dr. Narender Kumar ◽  
Mrs. Sunita Arora
Keyword(s):  
Granger Causality ◽  
Price Discovery ◽  
Precious Metals ◽  
Futures Market ◽  
Study Data ◽  
Futures Prices ◽  
Causality Test ◽  
Commodity Exchange ◽  
Long Time

Gold is the oldest known precious metal on this earth and for a long time it has been used as a standard currency. The present study has been undertaken with an attempt to analyze whether Indian futures market is playing its role of price discovery in case of gold or not. For the purpose of study, data for spot and futures prices for a period of four and a half years starting from June 2005 to December 2009 has been collected from the website of Multi Commodity Exchange of India Limited, India’s largest commodity exchange in terms of value of trading on commodity exchanges in India. Data has been tested for statioanrity and was found non stationary. It was then transformed to make it stationary. On the basis of Johansen’s cointegration test, series of spot and futures prices were found cointgrated. Granger Causality test was applied on stationary data. The results of the study show that futures market in India is performing its role of price discovery in case of Gold. Keywords: Price Discovery, Commodity Market, Granger Causality, Cointegration.

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