Authors:V. Rakić, V. Dondur, R. Hercigonja, and V. Andrić
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).
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
Authors:Szabó Julianna, Kissfazekas Kornélia, and 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
Authors:S. Menecier, S. Valette, P. Denoirjean, and P. Lefort
when wüstite Fe 1− x O is formed [ 1 , 2 ] according to the reaction:
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
Authors:N. Sergent, P. Gélin, L. Périer-Camby, H. Praliaud, and G. Thomas
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.
Authors:Weiyan Wang, Yunquan Yang, Hean Luo, and Wenying Liu
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
Authors:Godwins Okagbo Echejoh, Matthew N. Tanko, Agabus N. Manasseh, Stella Ogala-Echejoh, Barnabas Mandong, and Edith Okeke
2000 HIV-1 co infection in children hospitalized with tuberculosis in South Africa Int. J. Tuberc. Lung Dis. 4 448 – 454 .
. P. Eamranond E. Jaramillo 2001 Tuberculosis in children: reassessing the need for improved diagnosis in
Authors:Sachin Malwadkar, Parthasarathi Bera, M. S. Hegde, and C. V. V. Satyanarayana
, PEMFCs require hydrogen feed that is mostly free from CO (<10 ppm), as otherwise the Pt based anode catalyst would be deactivated rapidly [ 2 , 3 ]. However, typical gas mixtures that are produced from steam reforming or autothermal reforming contain CO