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Abstract
The active sites of hydrogen-exchanged Y zeolite (HY) and dealuminated (HDY) zeolites are investigated by TPD of carbon monoxide. Only the high temperature TPD spectra of CO (TM620-690C) were observed, meaning that CO molecules interact with very strong acid sites. The amounts of CO bonded on these sites are small (less than 1 molecule per unit cell). The strong influence of dealumination on the coverage degree is found. The calculated values for kinetic parameters indicate chemisorption of CO in the investigated systems (Edes240 kJ mol-1, A1011 s-1).
Introduction Traditional co-citation analysis does not take into account the proximity of references co-cited by an article. Some references are cited within the same sentence, whereas other references may be cited in further
contains 1–2% of CO [ 10 ]. In contrast, pure hydrogen, as used in fuel cells, is produced by purification using pressure swing adsorption. In the steel industry, a huge amount of coke oven gas, containing about 50% of hydrogen with a variety of impurities
Introduction Light olefin synthesis from CO hydrogenation has been considered as a possible solution and practical interest to meet the great demands for chemical feedstocks, which may provide a more economical way than the
The Duo-System technology, which is basically a combination of the Focus Ultra herbicide and cycloxydim-tolerant maize hybrids, is spreading as a tool for weed control in maize crops. The Cereal Research Non-Profit Co. Ltd. commenced the breeding of cycloxydim-tolerant maize (CTM) hybrids based on know-how from BASF. CTM hybrids were created by crossing the CTM inbred lines developed in the initial phase of the programme. The herbicide tolerance of the hybrids was tested in dose rate trials with Focus Ultra in 2008 and 2009. The agronomic value of the novel CTM hybrids was tested in performance trials in 2009. CTM hybrids with high yield potential have been selected as a result of the breeding programme.
Co-housing és városi fenntarthatóság
Piaci és közösségi többlakásos fejlesztések helyválasztása a fenntarthatóság tükrében
Co-housing and urban sustainability
Site selections for multi-apartment buildings of real estatement developers and co-housing communities in the light of urban sustainability
.) Babos Annamária – Horogh Petra – K. Theisler Katalin : Co-housing. Példák Bécsben és a közösségi együttélés lehetoségei Budapesten . Utóirat. A Régi-Új Magyar Építőművészet melléklete 18 ( 2018 ) 101 . 69 – 76
Abstract
The interactions of CO with a high specific surface area tin dioxide was investigated by FTIR spectroscopy and thermogravimetric analysis. FTIR study of CO interactions have shown that CO can adsorb on cus (coordinatively unsaturated sites) Sn4+ cation sites (band at 2201 cm-1). In addition, CO reacts with surface oxygen atoms. This leads to the partial reduction of SnO2 surface and to the formation of ionised oxygen vacancies together with the release of free electrons, which are responsible for the loss of transmission. Formed CO2 can chemisorb on specific surface sites: on basic sites to form carbonates species and on acidic sites (Sn4+-CO2 species) which is in competition with the formation of Sn4+-CO species. TG experiment have shown that the reduction of SnO2 by CO at 400°C occurs in two steps. First, the reduction of SnO2 surface, which is a quick phenomenon. This has allowed to evaluate that more than 12% of reducible surface oxygens can react with CO, essentially because of the presence of a large amount of surface hydroxyl groups. The second step of the reduction of SnO2 would be the progressive reduction of SnO2 bulk by the slow diffusion of oxygen atoms from the bulk to the surface.
Invar® oxidation in CO2
Kinetics and mechanism of formation of a wüstite layer
when wüstite Fe 1− x O is formed [ 1 , 2 ] according to the reaction: 1 that requires a sample heating in CO/CO 2 mixtures or in pure CO 2 atmosphere. It was worth verifying if such a process could be applied to Invar ® . This alloy was
sulfided Mo [ 3 , 4 ], Ni–Mo [ 5 – 10 ], Co–Mo [ 11 – 18 ] unsupported catalysts and their alumina-supported forms. Some researchers have studied the atomic ratios of major elements on pre-reaction and post-reaction sulfided Ni–Mo catalyst and confirmed
9 481 – 497 . GlÄnzel , W. 2001 National characteristics in international scientific co-authorship relations Scientometrics
