caa a22 4500 445387823 CHVBK 20180317143037.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11144-011-0300-9 doi (NATIONALLICENCE)springer-10.1007/s11144-011-0300-9 Water-gas shift activity of K-promoted (Ni)Mo/γ-Al2O3 systems in sulfur-containing feed [Elektronische Daten] [Dimitrinka Nikolova, Rumeana Edreva-Kardjieva, Tatyana Grozeva] The effect of potassium additive on the catalytic activity of nickel-molybdenum alumina-supported systems has been studied by varying the molybdenum content within 5-18 mass% MoO3, reaction temperature from 180 to 400 (500)°C, and steam to gas ratio of 0.3, 0.7, and 1. It has been established that potassium reduces the activity of one-component Mo-containing samples, while, independent of molybdenum loading, nickel promotes activity within the whole temperature range studied and extends the temperature range of catalytic activity by about 70°C to lower reaction temperatures. A symbatic or additive, or antibatic catalytic behavior was observed with NiMo-containing samples depending on the atomic Ni/Mo ratio and temperature range. Potassium, being a third component in tri-component KNiMo-containing samples, enhances the water-gas shift (WGS) activity depending on the atomic K/(Ni+Mo) ratio. The activity approaches the equilibrium conversion degree in the interval of 320-500°C. A decrease in the specific surface area of calcined and tested samples relative to the bare support shows close values indicating that the overall dispersion of the species is not changed during the catalytic test. Close examination indicated that the sample containing K2O, NiO, and MoO3 of 4.9, 2.5, and 12.7 mass%, respectively, was found to be the most suitable catalyst for water-gas shift reaction with sulfur containing feed since it attains equilibrium conversion even at 300°C, and at a low steam to gas ratio of 0.3atm. This catalyst demonstrates a stable and reproducible catalytic activity as inlet gas loading is increased. Akadémiai Kiadó, Budapest, Hungary, 2011 Water-gas shift reaction nationallicence CO conversion nationallicence Hydrogen production nationallicence Alkali additive nationallicence NiMo catalyst nationallicence Nikolova Dimitrinka Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St. Block 11, 1113, Sofia, Bulgaria aut Edreva-Kardjieva Rumeana Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St. Block 11, 1113, Sofia, Bulgaria aut Grozeva Tatyana Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St. Block 11, 1113, Sofia, Bulgaria aut Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 103/1(2011-06-01), 71-86 1878-5190 103:1<71 2011 103 11144 https://doi.org/10.1007/s11144-011-0300-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-011-0300-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nikolova Dimitrinka Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St. Block 11, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Edreva-Kardjieva Rumeana Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St. Block 11, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Grozeva Tatyana Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St. Block 11, 1113, Sofia, Bulgaria aut NATIONALLICENCE 773 0- Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 103/1(2011-06-01), 71-86 1878-5190 103:1<71 2011 103 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer