Manganese supported catalysts for selective catalytic reduction of nitrogen oxides with ammonia Part 1 Characterization

Abstract

SO 4 KMnO 4 solution, small clusters with a broad distribution of sizes were deposited. A monolayer coverage of manganese species could only be obtained when active carbon was pretreated in an oxidizing environment strong enough to produce a considerable amount of carboxylic functionalities. Additionally, the preparation procedures inÑuenced the textural properties.

Spectroscopic Investigation of Species Arising from CO Chemisorption on Titania-Supported Manganese

“…The values are 5.6 and 5.2 eV for the impregnated and ion-exchanged samples, respectively. Based on this, we can determine (1,22,23) (1,23). From this value it is difficult to estimate the degree of interaction of the deposited manganese ions with the surface of the support.…”

“…The nature of the manganese species in the catalysts is strongly influenced by the preparation conditions, such as the metal precursor, support used, loading, and calcination temperature (1)(2)(3)(4), and several oxidation states may coexist.…”

“…Foord et al (23) measured and tabulated the Mn 2p 3/2 binding energies and the O 1s:Mn 2p 3/2 intensity ratios as well as 3s multiplet splittings for stable MnO x species. Detailed values of binding energies and the splitting of Mn 3s for different manganese oxides were summarized by Grzybek et al (1) as well.…”

“…The extensive surface studies previously reported concern mostly manganese oxides supported on alumina and different spectroscopic methods, such as XRD, XPS, ISS, Raman and IR, TPD, and TPR, have been used (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) for their structural elucidation.…”

Niobia‐Supported Palladium–Manganese Materials: Synthesis and Structural Investigation

“…Applications in the field of catalysis are not numerous, but they are now growing. Restricting to monometallic‐supported MnO x , surface characterization1,2 as well as the interaction of NH 3 and NO x 3 have been studied on alumina‐supported MnO x , whereas selective catalytic reduction of NO x has been investigated on carbon‐supported MnO x 4 and dehydrogenation of 1‐butene into 1,3‐butadiene explored on MnO 2 /zirconia 5. The nature of the manganese species in these materials is strongly influenced by the preparation methods and the thermal treatments; hence several oxidation states may coexist.…”