Manganese-alumina catalyst

Other metal oxide catalysts studied for the SCR-NH3 reaction include iron, copper, chromium and manganese oxides supported on various oxides, introduced into zeolite cavities or added to pillared-type clays. Copper catalysts and copper-nickel catalysts, in particular, show some advantages when NO—N02 mixtures are present in the feed and S02 is absent [31b], such as in the case of nitric acid plant tail emissions. The mechanism of NO reduction over copper- and manganese-based catalysts is different from that over vanadia—titania based catalysts. Scheme 1.1 reports the proposed mechanism of SCR-NH3 over Cu-alumina catalysts [31b],... 

Houdry cracking process. Decomposition of petroleum or heavy petroleum fractions into more useful lower-boiling materials by heating at 500C and 30 psi over a silica-alumina-manganese oxide catalyst. 

Supported manganese-oxide catalysts were prepared in three alumina-based supports mesoporous synthetic and commercial 7-AI2O3 (surface areas of 287 and 184 m g , respectively) and nonporous a-Al203 (surface area = 35 m The hybrid materials were tested in the catalytic ozo-... 

Q. Tang, X. Gong, P. Zhao, Y. Chen, Y. Yang, Copper—manganese oxide catalysts supported on alumina physicochemical features and catal3dic performances in the aerobic oxidation of benzyl alcohol, Appl. Catal. A General 389 (2010) 101—107. 

Kapteijn F, Singoredjo L, Vandriel M, Andreini A, Moulijn JA, Ramis G, Busca G (1994) Alumina-Supported Manganese Oxide Catalysts. 2. Surface Characterization and Adsorption of Ammonia and Nitric-Oxide. J Catal 150 (1) 105-116 Kijlstra WS, Brands DS, Poels EK, Bliek A (1997) Mechanism of the Selective Catalytic Reduction of NO by NH3 over Mn0x/Al203. J Catal 171 (1) 208-218... 

Tseng TK, Wang L, Ho CT, Chu H. The Destruction of Dichloroethane over a y-Alumina Supported Manganese Oxide Catalyst.2010 178 1035-1040. 

In the case of alcohol conversion, the observed behaviour suggests that the evolution of acetates (either formed by direct ethanol oxidation or by C-C breaking in the case of higher alcohol oxidation) may be the rate-determining step of the catalytic combustion reaction. Two types of acetates are instead found over supported catalysts. Some of them essentially reflect the catal5dic activity of manganese oxides and are burnt fast, while others behave as those on bare support such as alumina, i.e. inactive in the catalytic oxidation. Part of the acetate species in the case of Mn-alumina catalysts are consequently inactive spectators during the combustion reaction. 

Kapteijn, R, Singoredjo, L., van Driel, M., Andreini, A., Moulijn, J.A., Ramis, G., and Busca, G. Alumina-supported manganese oxide catalysts surface characterization and adsorption of ammonia and nitric oxide. J. Catal 1994, 150,105-116. 

Gandia, L.M., Vicente, M.A., and Gil, A. Complete oxidation of acetone over manganese oxide catalysts supported on alumina and zirconia-pillared clays. Appl. Catal. B Environ. 2002, 38, 295—307. 

Many catalyst chemical formulations and geometric shapes are used to promote oxidation-reduction reactions. Chemical types used for VOC oxidation include platinum, platinum alloys, copper chromate, copper oxide, cobalt oxide, chromium oxide, manganese oxide, and nickel. The catalysts are often categorized as platinum metal group (PMG) and base metal (or metal oxide) types. The active catalyst is often supported on an inert carrier such as gamma alumina. Catalyst forms include metal ribbons, mesh and gauze honeycomb monoliths and small beads or particles that can be used in a fixed, fluidized, or moving bed. 

Catalysts used for preparing amines from alcohols iaclude cobalt promoted with tirconium, lanthanum, cerium, or uranium (52) the metals and oxides of nickel, cobalt, and/or copper (53,54,56,60,61) metal oxides of antimony, tin, and manganese on alumina support (55) copper, nickel, and a metal belonging to the platinum group 8—10 (57) copper formate (58) nickel promoted with chromium and/or iron on alumina support (53,59) and cobalt, copper, and either iron, 2iac, or zirconium (62). 

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