Selective catalytic reduction of nitric oxide over amorphous and crystalline chromia

Curry-Hyde, H. Edward; Musch, H.E.; Baiker, Alfons

doi:10.1016/s0166-9834(00)81598-5

Cited by 75 publications

(28 citation statements)

References 13 publications

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“…What has ledto the formation of this compound is perhaps hydroxyl radicals formed from the water molecules that are found in the vapor of the collapsing bubble. However, we cannot rule out the possibility that part of the green solid is Fe 3 (CO) 9 . This assignment is based on the IR peak at 2041 cm −1 .…”

Section: Resultsmentioning

confidence: 96%

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Sonochemical synthesis of stable hydrosol of Fe3O4 nanoparticles

Mukh-Qasem

Gedanken

2005

Journal of Colloid and Interface Science

139

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Section: Resultsmentioning

confidence: 96%

“…Metal oxides have important applications, such as magnetic storage media, solar energy transformation, electronics, catalysis [6][7][8][9][10] and biological applications such as tags in sensing, imaging, and delivery.…”

Section: Introductionmentioning

confidence: 99%

Sonochemical synthesis of stable hydrosol of Fe3O4 nanoparticles

Mukh-Qasem

Gedanken

2005

Journal of Colloid and Interface Science

139

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“…This implies that there is a strong interaction between MnCe and the PILC supports, which inhibits crystallization of both species and destroyed the order of PILC. This may favor the NO SCR since it has been proved that amorphous MnO x gives good performance for the SCR of NO with NH 3 and amorphous chromia shows excellent N 2 selectivity …”

Section: Resultsmentioning

confidence: 99%

“…This may favor the NO SCR since it has been proved that amorphous MnO x gives good performance for the SCR of NO with NH 3 and amorphous chromia shows excellent N 2 selectivity. 25,33 Since no species of Mn, Ce, Cr, and Al were reflected in XRD spectra, the concentrations of the elements, principally Mn, Ce, Al, Cr, Si, O, Fe, Ca, Na, K, on the surface of MnCe/Al-PILC, MnCe/Cr -PILC and MnCe/AlCr-PILC, were checked by the EDS technique. As listed in Table 2, there is negligible Cr on the surface of MnCe/Al-PILC, but a certain amount of Cr on MnCe/Cr-PILC and MnCe/AlCr-PILC.…”

Section: Resultsmentioning

confidence: 99%

Co-catalytic effect of Al-Cr pillared montmorillonite as a new SCR catalytic support

Chen

Cen

Feng

et al. 2016

J. Chem. Technol. Biotechnol.

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BACKGROUND It is of great interest to use pillared clay (PILC) as a cheap support for a selective catalytic reduction (SCR) catalyst. Al‐Cr pillared clay (AlCr‐PILC) has high thermal stability due to the introduction of polycations of Al. As a support, AlCr‐PILC may show a co‐catalytic effect in SCR processes because chromium oxide itself is an active SCR catalyst. The aim of this work is to investigate the potential of AlCr‐PILC as a new low temperature SCR catalyst support. RESULTS A series of AlCr‐PILC with Al:Cr molar ratio varying from 0:4 to 4:0 were successfully synthesized to support manganese and cerium active phase. MnCe/AlCr(2:2)‐PILC exhibited the highest NOx conversion close to 100% at 200–300 °C, and more than 90% N2 selectively over a wide temperature window of 140–300 °C. The catalytic activity of MnCe/AlCr‐PILC in terms of both NOx conversion and N2 selectivity is much higher than those of MnCe/Al‐PILC, MnCe/Cr‐PILC, AlCr‐PILC, and the simple mixed MnCeAlCr, indicating the co‐catalytic effect of AlCr‐PILC support. CONCLUSION AlCr‐PILC is a very promising low‐temperature SCR catalyst support. The XRD, XPS, and H2‐TPR measurements prove that the co‐catalytic effect of AlCr‐PILC occurred via the strong interaction between MnCe and the AlCr‐PILC support. © 2016 Society of Chemical Industry

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“…The elimination of unstable chromates by a brief CO-reduction at 623 K [12,13], or by hydrolysis at room temperature [14,15], does not significantly alter the surface redox activity [11]. It is worth noting that the high volatility of Cr(VI)-O compounds has led environmentalists to classify these compounds as detrimental within the atmosphere [16].…”

Section: Introductionmentioning

confidence: 99%