ChemInform Abstract: Alumina‐Supported Manganese Oxide Catalysts. Part 1. Characterization: Effect of Precursor and Loading.

Kapteijn, F.; Langeveld, A.D. van; Moulijn, Jacob A.; Andreini, A.; Vuurman, Michael A.; Turek, Andrzej M.; Jehng, Jih‐Mirn; Wachs, Israel E.

doi:10.1002/chin.199506020

Cited by 31 publications

(46 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…XPS measurements were carried out to confirm the presence of Mn and its oxidation state. Figure 5(b) shows the Mn 2p photoelectron peak of Mn-TiO 2 : the binding energy of Mn 2p 3/2 at 641.8 eV can be ascribed to Mn 3+ , while the other peak at 642.4 eV originates from Mn 4+ [19][20][21][22][23]. The presence of Mn 4+ has a certain influence on the XPS spectrum of Ti 2p (Fig.…”

Section: Inhibition Effect Of Mn 2+ On the Crystallization Of Tiomentioning

confidence: 95%

Synthesis of ordered multivalent Mn-TiO2 nanospheres with tunable size: A high performance visible-light photocatalyst

Wang

Fan

et al. 2011

Nano Res.

View full text Add to dashboard Cite

A facile and reproducible method has been developed for the synthesis of ordered anatase Mn-TiO 2 nanospheres with controllable sizes in the range 200-300 nm by simply varying the amount of manganese(Ⅱ) chloride added. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and transmission electron microscope (TEM) measurements, and it was found that the manganese exists in multivalent forms (Mn 4+ / Mn 3+ ) and substitutes for some of the Ti 4+ in the anatase TiO 2 lattice. The presence of Mn significantly influences the morphology and high-temperature stability of TiO 2 , and extends its light absorption range. Surface photovoltage and photocurrent measurements revealed that an electronic interaction between the Mn and TiO 2 was present, in which Mn served as an electron acceptor and effectively inhibited the charge recombination in TiO 2 ; this is thought to be responsible for the highly efficient photocatalytic activity of the material in the degradation of rhodamine B (RhB) under visible-light irradiation (λ > 420 nm).

show abstract

Section: Inhibition Effect Of Mn 2+ On the Crystallization Of Tiomentioning

confidence: 95%

Synthesis of ordered multivalent Mn-TiO2 nanospheres with tunable size: A high performance visible-light photocatalyst

Wang

Fan

et al. 2011

Nano Res.

View full text Add to dashboard Cite

show abstract

“…Both the oxides possess strong basic sites that may interact with the manganese ions contained in the acidic solution of the nitrate precursor during the preparation. During the calcination, residues of the manganese salts and solvating water are removed and some condensation, resulting in bond formation between the support surface oxygen and manganese may occur [23]. This may indicate that the surface lattice oxygen is then less susceptible for the interaction with H2S and it may rather be the bulk lattice oxygen that participates in the sorption process.…”

Section: Mno-support + H2s ↔ Mns-support + H2omentioning

confidence: 99%

“…The new diffraction lines observed after the impregnation are attributed to Mn2O3. The presence of this oxide can be expected when considering the manganese precursor used, Mn loading and calcination temperature [11,23,29,30]. These factors have a strong influence on the properties of the manganese species formed during the preparation.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

“…These factors have a strong influence on the properties of the manganese species formed during the preparation. It was reported that the use of acetate precursor may lead to the formation of the surface manganese oxide layer on alumina while the use of the nitrate precursor will result in a formation of small crystallinities of manganese oxide on the alumina surface [23]. Herein, the nitrate Mn precursor was used in the sample preparation allowing for a facile one-step impregnation suiting well to a comparative purpose of the study.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

See 1 more Smart Citation

Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

Chytil

Kure

Lødeng

et al. 2017

Fuel

View full text Add to dashboard Cite

Abstract:High temperature H2S sorbents comprising manganese oxide (15 wt. %) supported on TiO2, ZrO2, CeO2 and Al2O3 were prepared by wet impregnation using Mn(NO3)2.4H2O as Mn precursor. Upon activation in H2, the sorbent performance testing was conducted at 650 °C in a model gas mixture with a composition of 0.4 vol. % of H2S in 40 vol. % of H2, the balance being inert gas (N2 and Ar).Sorbent regeneration was performed at 650 °C with 5.2 vol. % of O2 in N2. The initial sorption performance is first reported for the parent (Mn-free) supports showing a considerable H2S sorption on ZrO2 and CeO2 and a minor sorption on Al2O3 and TiO2. The Mn sorbents were subject to 13 sorption/regeneration cycles. The highest initial sorption capacity is reported for cerium supported Mn oxide, which is also the sample that deactivates most. A prolonged exposure to H2 at 650 °C results in a reversible loss of the sorption capacity that was observed for all the samples except for Mn on zirconia suggesting its superior stability in H2.

show abstract

“…Kapteijn et al, (1994aKapteijn et al, ( , 1994b found that a Mn/ Al 2 O 3 catalyst obtained from manganese acetate had better activity than a catalyst produced from manganese nitrate. This was attributed to highly dispersed manganese oxides on the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

The effects of manganese precursors on Mn-based/TiO₂ catalysts for catalytic reduction of NO with NH₃

Tong

Huang

2012

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

Manganese acetate (MnAc) and manganese nitrate (MnN) were employed as precursors for the preparation of Mn(Ac)/TiO 2 , Mn (N)/TiO 2 , Mn(Ac)-Ce/TiO 2 , and Mn(N)-Ce/TiO 2 by impregnation. These complexes were used as catalysts in the low-temperature selective catalytic reduction of NO with NH 3 . The influence of manganese precursors on catalyst characteristics, the reduction activity, and the stability of the catalysts to poisoning by H 2 O and SO 2 were studied. Experiments showed that Mn(N) produced MnO 2 with large grain sizes in Mn(N)/TiO 2 catalyst. On the contrary, Mn(Ac) led to highly dispersed and amorphous Mn 2 O 3 in Mn (Ac)/TiO 2 catalyst, which had better catalytic activity and stability to SO 2 at low temperatures. The doping of cerium reduced the differences in catalytic performance between the catalysts derived from different Mn precursors.Implications: Developing catalyst for selective catalytic reduction (SCR) of NO x from stationary sources at low reaction temperature is an attractive and key area of alternative process for existing SCR technology due to economical and environmental reasons. Manganese-based catalysts were proven very active at low temperature. In this paper, comparative studies were conducted on how manganese precursors were affecting the properties of resultant Mn-based/TiO 2 catalysts. Different precursors could lead to different grain size of active components, manganese oxide dispersion, and surface phase state of Mn/TiO 2 catalyst, whereas these influences are reduced with the doping of cerium oxides into Mn/TiO 2 .

show abstract

ChemInform Abstract: Alumina‐Supported Manganese Oxide Catalysts. Part 1. Characterization: Effect of Precursor and Loading.

Cited by 31 publications

References 1 publication

Synthesis of ordered multivalent Mn-TiO2 nanospheres with tunable size: A high performance visible-light photocatalyst

Synthesis of ordered multivalent Mn-TiO2 nanospheres with tunable size: A high performance visible-light photocatalyst

Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

The effects of manganese precursors on Mn-based/TiO₂ catalysts for catalytic reduction of NO with NH₃

Contact Info

Product

Resources

About

ChemInform Abstract: Alumina‐Supported Manganese Oxide Catalysts. Part 1. Characterization: Effect of Precursor and Loading.

Cited by 31 publications

References 1 publication

Synthesis of ordered multivalent Mn-TiO2 nanospheres with tunable size: A high performance visible-light photocatalyst

Synthesis of ordered multivalent Mn-TiO2 nanospheres with tunable size: A high performance visible-light photocatalyst

Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

The effects of manganese precursors on Mn-based/TiO2 catalysts for catalytic reduction of NO with NH3

Contact Info

Product

Resources

About

The effects of manganese precursors on Mn-based/TiO₂ catalysts for catalytic reduction of NO with NH₃