Preparation and characterization of CuO-CeO 2 -ZrO 2 /cordierite monolith catalysts

Lu, Shuaishuai; Zhang, Jingde; Sun, Yuanyuan; Liu, Huichao

doi:10.1016/j.ceramint.2017.01.118

Cited by 10 publications

(5 citation statements)

References 23 publications

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“…From table 2, the Pearson correlation coe cient between water absorption rate and upload rate was 0.55 > 0, in [0.4, 0.6) interval, water absorption rate and upload rate can be thought of two variables are moderately correlation, and the positive correlation. L Baharudin [19] also veri ed this conclusion. (…”

Section: Effect Of Carrier Pretreatment On the Performance Of The Catalystsmentioning

confidence: 56%

“…Lai et al [18] used alumina as the coating carrier to prepare MnO x /La-Al 2 O 3 monolithic catalyst by incipient wetness impregnation method, the T 90 of catalytic degradation of toluene was 275℃.Yang et al [19] used OMS-2 as the coating carrier to prepare Co 3 O 4 /OMS-2 monolithic catalyst, the contact area of the catalyst with the same mass can be increased by about 4 times compared with the traditional powder-type catalyst. Lu [20] and Sun [21] used different concentrations of nitric acid for acidic pretreatment of the carrier, which not only improved the speci c surface area of the carrier, but also increased the loading rate of the coating, thus improving the catalytic performance of the monolayer catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Properties of Cordierite Support and Catalyst Slurry on the Catalytic Degradation of Toluene by Monolith Catalyst

Liang¹,

Q²,

Ren³

et al. 2021

Preprint

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Monolithic catalysts are widely used in industrial catalysis. However, in the preparation of monolithic catalyst, the most important catalyst coating has the problems of low upload rate and poor uniformity. In the present work, the effects of acid treatment of carrier on the upload rate and the effects of size of slurry and dispersant on the uniformity of coating were investigated. The weight loss rate and water absorption rate of cordierite, slurry stability, coating upload rate and catalytic performance were also tested. Characterization analysis was carried out by means of BET, SEM, Zeta potential, the laser grain-size analyzer. The results showed that the optimal performance of cordierite carrier could be obtained by heating the cordierite carrier with 20% HCl for 3 h; the water absorption rate could increase for more than 48.0%, and the upload rate could reach 14.5%. Pearson test showed that there was a moderate positive correlation between water absorption rate and upload rate. It was also found that reducing the particle size of the slurry (1.47 microns) and adding 4% dispersant PAA could effectively improve the stability of the suspension and the uniformity of the coating. When 20% HCl was used to pretreat, the toluene catalytic activity of the monolith catalyst prepared by cordierite increased, in which T10 and T90 both increased for about 5 ℃. At the same time, reducing particle size and adding dispersant could also promote the catalytic degradation efficiency to a certain extent.

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Section: Effect Of Carrier Pretreatment On the Performance Of The Catalystsmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Effect of the Properties of Cordierite Support and Catalyst Slurry on the Catalytic Degradation of Toluene by Monolith Catalyst

Liang¹,

Q²,

Ren³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…In this study, ceramic monoliths with a honeycomb structure of cordierite (2Al 2 O 3 .5SiO 2 .2MgO) were used as catalyst support with a volume of 200 cm 3 . However, the surface area of honeycomb cordierite is very low, as 1 m 2 /g, and di cult to load active components directly (Shigapov et al 1999;Lu et al 2017;Li et al 2016). Shigapov et al (1999) reported that oxalic acid has relatively low volatility in aqueous solution, is less destructive and improves surface area of cordierite.…”

Section: Catalyst Synthesismentioning

confidence: 99%

Comparison of physicochemical properties and selective catalytic reduction activities of CeMn/TiO2 catalysts with and without phosphorus additives

Keskin

2021

Preprint

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Lubricant additives contain phosphorus, which has a fly ash effect. Phosphorus negatively affects catalyst activity. Determining the effects of phosphorus loading amount on the catalytic activity is important for the development of catalysts with high NOx reduction. This study focuses on the control of NOx emissions, one of the air pollutants released from the diesel engine. The catalysts used in the reduction of NOx emissions were synthesized by washcoating method. Ce and Mn contents of all catalysts were adjusted as 3%, while the phosphorus contents of poisoned catalysts were adjusted as 0.5% and 1%. For this purpose, cordierite with high surface area was used. The catalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Brunauer-Emmett-Teller (BET), X-Ray diffraction (XRD) and ultraviolet visible spectroscopy (UV-Vis) analyzes. The NOx reduction activity of with and without phosphorus doped CeMn/TiO2 catalysts was investigated with the designed selective catalytic reduction system (SCR). NOx conversion ratios of the CeMn/TiO2 catalyst reached the high values of 84.6% at 280°C. After the phosphorus loading, the structure of the CeMn/TiO2 catalyst deteriorated, and the NOx conversion ratios decreased. 0.5P-CeMn/TiO2 and 1P-CeMn/TiO2 catalysts showed lower NOx conversion ratios compared to CeMn/TiO2 catalyst. CeMn-TiO2 catalyst was found highly active for SCR at all tests. Phosphorus loading caused deactivation of the catalyst and deactivation increased due to the increase in phosphorus loading amount.

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“…In this study, ceramic monoliths with a honeycomb structure of cordierite (2Al2O3.5SiO2.2MgO) were used as catalyst support with a volume of 200 cm 3 . However, the surface area of honeycomb cordierite is very low, as 1 m 2 /g, and difficult to load active components directly [23][24][25]. Shigapov et al [23] reported that oxalic acid has relatively low volatility in aqueous solution, is less destructive and improves surface area of cordierite.…”

Section: Catalyst Synthesismentioning

confidence: 99%

Comparison of physicochemical properties and selective catalytic reduction activities of CeMn/TiO2 catalysts with and without phosphorus additives

Keskin

2021

International Journal of Automotive Science and Technology

View full text Add to dashboard Cite

Lubricant additives contain phosphorus, which has a fly ash effect. Phospho-rus negatively affects catalyst activity. Determining the effects of phosphorus loading amount on the catalytic activity is important for the development of cata-lysts with high NOx reduction. This study focuses on the control of NOx emissions, one of the air pollutants released from the diesel engine. The catalysts used in the reduction of NOx emis-sions were synthesized by washcoating method. Ce and Mn contents of all cata-lysts were adjusted as 3%, while the phosphorus contents of poisoned catalysts were adjusted as 0.5% and 1%. For this purpose, cordierite with high surface area was used. The catalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Brunauer-Emmett-Teller (BET), X-Ray diffraction (XRD) and ultraviolet visible spectroscopy (UV-Vis) analyzes. The NOx reduction activity of with and without phosphorus doped CeMn/TiO2 catalysts was investigated with the designed selective catalytic reduction system (SCR). NOx conversion ratios of the CeMn/TiO2 catalyst reached the high values of 84.6% at 280 °C. After the phosphorus loading, the structure of the CeMn/TiO2 catalyst deteriorated, and the NOx conversion ratios decreased. 0.5P-CeMn/TiO2 and 1P-CeMn/TiO2 catalysts showed lower NOx conversion ratios compared to CeMn/TiO2 catalyst. CeMn/TiO2 catalyst was found highly active for SCR at all tests. Phosphorus loading caused deactivation of the catalyst and deactivation increased due to the increase in phosphorus loading amount.

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Preparation and characterization of CuO-CeO 2 -ZrO 2 /cordierite monolith catalysts

Cited by 10 publications

References 23 publications

Effect of the Properties of Cordierite Support and Catalyst Slurry on the Catalytic Degradation of Toluene by Monolith Catalyst

Effect of the Properties of Cordierite Support and Catalyst Slurry on the Catalytic Degradation of Toluene by Monolith Catalyst

Comparison of physicochemical properties and selective catalytic reduction activities of CeMn/TiO2 catalysts with and without phosphorus additives

Comparison of physicochemical properties and selective catalytic reduction activities of CeMn/TiO2 catalysts with and without phosphorus additives

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