NO reduction by CH4 in the presence of excess O2 over Co/sulfated zirconia catalysts

Li, Ning; Wang, Aiqin; Tang, Junwang; Wang, Xiaodong; Liang, Dongbai; Zhang, Tao

doi:10.1016/s0926-3373(02)00301-6

Cited by 49 publications

(37 citation statements)

References 64 publications

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“…[36] by precipitation of ZrCl 2 O·8H 2 O (1.0 M, 31.9 mL) and NH 4 H 2 PO 4 (1.0 M, 63.8 mL) at a molar ratio of P/Zr = 2.0. The precipitate was filtered, washed with deionized water, dried at 100 • C, and then calcined at 400 • C for 3 h. Sulfated zirconia (SZ) was prepared according to our previous work [37] by impregnation of Zr(OH) 4 with an aqueous solution of 0.5 M (NH 4 ) 2 SO 4 at the ratio of 15 mL/g. The slurry was stirred for 30 min, filtrated without washing, dried at 110…”

Section: Catalyst Preparationmentioning

confidence: 99%

Dehydration of xylose to furfural over niobium phosphate catalyst in biphasic solvent system

Pholjaroen

Wang

et al. 2013

Journal of Energy Chemistry

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Section: Catalyst Preparationmentioning

confidence: 99%

Dehydration of xylose to furfural over niobium phosphate catalyst in biphasic solvent system

Pholjaroen

Wang

et al. 2013

Journal of Energy Chemistry

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“…6, the acidities of Co/SZ catalysts varied little when the Co content increased from 2 to 8 wt%. In our previous work [31], we have found that the activity of Co/SZ catalyst is strongly dependent on the Co loading. With the increase of Co content, the maximum NO conversion over Co/SZ increased initially, reached the highest value when the Co content is about 4 wt%, and then decreased.…”

Section: Nh 3 -Tpd and Ft-ir Spectroscopy Characterizationmentioning

confidence: 91%

“…Sulfated zirconia was prepared as described previously [31] by impregnating the precursor Zr(OH) 4 (AR grade, Shanghai Agent Company, China) with an aqueous solution of 0.5 M (NH 4 ) 2 SO 4 in the ratio of 15 ml/g. The slurry was stirred slowly for half an hour, filtrated without washing, and dried at 110 • C overnight.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…Therefore, the development of new catalysts with higher tolerance toward the poisoning of water and SO 2 is very important. Recently, we first investigated the catalytic performance of a series of nonnoble metal (Co, Mn, In, Ni)-loaded sulfated zirconia (SZ) for the SCR of NO with methane and found that Co exhibited the highest promoting effect on the activity of SZ catalysts among the investigated metals [31]. The optimum Co content of Co/SZ catalyst is about 4 wt%.…”

Section: Introductionmentioning

confidence: 99%

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Probing into the catalytic nature of Co/sulfated zirconia for selective reduction of NO with methane

2004

Journal of Catalysis

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In this work, the structural and surface properties of Co-loaded sulfated zirconia (SZ) catalysts were studied by X-ray diffraction (XRD), N 2 adsorption, NH 3 -TPD, FT-IR spectroscopy, H 2 -TPR, UV-vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and NO-TPD. NH 3 -TPD and FT-IR spectra results of the catalysts showed that the sulfation process of the support resulted in the generation of strong Brønsted and Lewis acid sites, which is essential for the SCR of NO with methane. On the other hand, the N 2 adsorption, H 2 -TPR, UV/vis DRS, and XPS of the catalysts demonstrated that the presence of the SO 4 2− species promoted the dispersion of the Co species and prevented the formation of Co 3 O 4 . Such an increased dispersion of Co species suppressed the combustion reaction of CH 4 by O 2 and increased the selectivity toward NO reduction. The NO-TPD proved that the loading of Co increased the adsorption of NO over SZ catalysts, which is another reason for the promoting effect of Co.  2004 Elsevier Inc. All rights reserved.

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“…The fi rst approach to explain the differences in the catalytic activity observed between the four series of catalysts with a different metal could come from considering the corresponding differences in NO absorption capacity which indicates that the most active catalysts are those possessing a higher tendency to absorb NO. Li et al 28 suggested that the catalytic activity of a catalyst to NO conversion is proportional to its NO absorption capacity at room temperature. They considered that the properties of the zeolites e.g.…”

Section: -30mentioning

confidence: 99%

Influence of the exchanged metal ions (Cu, Co, Ni and Mn) on the selective catalytic reduction of NO with hydrocarbons over modified ferrierite

Ćwikła-Bundyra

2013

Polish Journal of Chemical Technology

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This article presents the research results concerning the possibilities of natural zeolite-ferrierite application for the reduction of nitrogen oxide. H-FER forms were modifi ed by Cu +2 , Co +2 , Mn +2 , Ni +2 using an ion exchange procedure. The effect of metal contents was shown for the ferrierite matrices and related to their catalytic properties. The catalytic properties of Cu-, Co-Ni-, and Mn-were compared for NO reduction with methane. High NO conversion was observed for copper and cobalt-ferrierite catalysts, especially in the temperature range 400 and 500 o C. It was found that copper-and cobalt-ferrierite catalysts have higher activity and N 2 selectivity than the catalysts composed of nickel and manganese doped on ferrierite. Moreover, the nickel and manganese containing catalysts produced more nitrous oxide than nitrogen. The presence of both copper and cobalt species seems to be an indispensable condition for a large activity and selectivity in the NO reduction.

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NO reduction by CH4 in the presence of excess O2 over Co/sulfated zirconia catalysts

Cited by 49 publications

References 64 publications

Dehydration of xylose to furfural over niobium phosphate catalyst in biphasic solvent system

Dehydration of xylose to furfural over niobium phosphate catalyst in biphasic solvent system

Probing into the catalytic nature of Co/sulfated zirconia for selective reduction of NO with methane

Influence of the exchanged metal ions (Cu, Co, Ni and Mn) on the selective catalytic reduction of NO with hydrocarbons over modified ferrierite

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