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

Li, Ning; Wang, Aiqin; Zheng, Mingyuan; Wang, Xiaodong; Cheng, Ruihua; Zhang, Tao

doi:10.1016/j.jcat.2004.04.026

Cited by 47 publications

(5 citation statements)

References 61 publications

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“…We have evaluated four samples with acid sites of different nature, both Brønsted (mainly SO 3 H, H + and -OH from the support surface) and Lewis (Ni, Zr, Al), all of them contributing to weak and strong acid sites [ 36 ]. The evaluated samples have surface -OH groups that could be responsible for the acidity given by the first desorption peak.…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, both A15 and STA/HASG 100 , despite having stronger acid sites than ZS as evidenced in this higher temperature of desorption, hold significantly lower LT/HT ratios, i.e., 0.64 and 0.57, respectively. We have evaluated four samples with acid sites of different nature, both Brønsted (mainly SO3H, H + and -OH from the support surface) and Lewis (Ni, Zr, Al), all of them contributing to weak and strong acid sites [36]. The evaluated samples have surface -OH groups that could be responsible for the acidity given by the first desorption peak.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

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Comparative Study of Different Acidic Surface Structures in Solid Catalysts Applied for the Isobutene Dimerization Reaction

et al. 2020

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Dimerization of isobutene (IBE) to C8s olefins was evaluated over a range of solid acid catalysts of diverse nature, in a fixed bed reactor working in a continuous mode. All catalytic materials were studied in the title reaction performed between 50–250 °C, being the reaction feed a mixture of IBE/helium (4:1 molar ratio). In all materials, both conversion and selectivity increased with increasing reaction temperature and at 180 °C the best performance was recorded. Herein, we used thermogravimetry analysis (TGA) and temperature programmed desorption of adsorbed ammonia (NH3-TPD) for catalysts characterization. We place emphasis on the nature of acid sites that affect the catalytic performance. High selectivity to C8s was achieved with all catalysts. Nicely, the catalyst with higher loading of Brønsted sites displayed brilliant catalytic performance in the course of the reaction (high IBE conversion). However, optimum selectivity towards C8 compounds led to low catalyst stability, this being attributed to the combined effect between the nature of acidic sites and structural characteristics of the catalytic materials used. Therefore, this study would foment more research in the optimization of the activity and the selectivity for IBE dimerization reactions.

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Section: Resultsmentioning

confidence: 99%

Section: Catalysts Characterizationmentioning

confidence: 99%

Comparative Study of Different Acidic Surface Structures in Solid Catalysts Applied for the Isobutene Dimerization Reaction

et al. 2020

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“…8 as shown there is no indication of H 2 consumption for all SZ samples. For all sulfated zirconia catalysts, there is no indication of H 2 consumption at temperatures below 550°C (40) . From TPR profiles, there is a broad peak starting from 550 to 620°C which decreases significantly as the calcination temperature increases.…”

Section: Temperature Programmed Reduction (Tpr)mentioning

confidence: 89%

“…Further, increase of calcination temperature to 550, 600 and 650°C gives successively decreasing values of specific surface area and pore volume to 57m 2 /g and 0.124cm 3 /g, respectively. This decrease in specific surface area and pore volume of the catalysts is attributed to the phase transformation from tetragonal to the denser monoclinic phase (40) associated with migration and agglomeration of the particles. This effect is more evident through increasing temperature from 600 to 650°C.…”

Section: Transmission Electron Microscope (Tem)mentioning

confidence: 98%

Sulfated Zirconia Catalysts for Low Temperature Isomerization of n-Pentane

2012

Egypt. J. Chem.

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NCONVENTIONAL sulphated zirconia (SZ) catalysts were .….. prepared and examined for n-pentane isomerisation in this investigation. The sulfation was performed using H 2 SO 4 acid. The calcination step seems to attain the highest influence using our sol-gel preparations, where the crystallinity transforms to the denser form. However, the surface properties do not exhibit such effectiveness. Calcination at 500°C gives the best activities and stabilities, whereas at 650°C, calcination is deteriorative. IR spectra, TPR, TGA, DSC, XRD and surface properties of the current catalysts were investigated.

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“…Yuan et al [40] previously demonstrated that L acids are the adsorption sites for nitrate, which is the key intermediate for SCR. The concentration of L acids is proportional to the strength of the bands at 1444 and 1450 cm -1 with a decreasing order of Cu0.5Mg1.5Mn0.5Al0.5Ox > Mg2Mn0.5Al0.5Ox > Cu2Mn0.5Al0.5Ox > Mn/γ-Al2O3 [41,42]. In order to quantitatively analyze the concentration of acid sites, the strength of the peaks at 1450 and 1444 cm -1 was quantified for L acids.…”

Section: Scr Activity Of Cuwmg2-wmn05al05ox and 2 Wt% Mn/γ-al2o3 Camentioning

confidence: 99%

Synthesis of Cu0.5Mg1.5Mn0.5Al0.5Ox mixed oxide from layered double hydroxide precursor as highly efficient catalyst for low-temperature selective catalytic reduction of NOx with NH3

Yan

Chen

Zhang

et al. 2018

Journal of Colloid and Interface Science

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We report a novel NH-SCR catalyst CuMgMnAlO synthesized from layered double hydroxides with superior activity in a wide temperature range and improved SO and HO resistance comparing to conventional doped Mn/γ-AlO. This catalyst results in a high NO removal efficiency of 87.0-96.6% in the low temperature range of 100-250 °C, much better than Mn/γ-AlO (35.0-67.2%). Besides, it exhibits significant resistance to SO and HO due to the existence of Cu and Mg. The promoting effects of Cu and Mg are thoroughly investigated using various physico-chemical techniques. The superior NH-SCR activity of CuMgMnAlO catalyst can be associated with its high specific surface area, high reducibility of MnO and CuO species, abundance of acid sites, and the well dispersion of MnO and CuO species. The interactions between SO and NH, and the degradation mechanism caused by SO were investigated using in-situ DRIFT analysis.

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

Cited by 47 publications

References 61 publications

Comparative Study of Different Acidic Surface Structures in Solid Catalysts Applied for the Isobutene Dimerization Reaction

Comparative Study of Different Acidic Surface Structures in Solid Catalysts Applied for the Isobutene Dimerization Reaction

Sulfated Zirconia Catalysts for Low Temperature Isomerization of n-Pentane

Synthesis of Cu0.5Mg1.5Mn0.5Al0.5Ox mixed oxide from layered double hydroxide precursor as highly efficient catalyst for low-temperature selective catalytic reduction of NOx with NH3

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