Catalytic deactivation mechanism research over Cu/SAPO-34 catalysts for NH3-SCR (I): The impact of 950 °c hydrothermal aging time

2018 ◽  
Vol 176 ◽  
pp. 285-293 ◽  
Author(s):  
Dequan Fan ◽  
Jun Wang ◽  
Tie Yu ◽  
Jianqiang Wang ◽  
Xiaoqian Hu ◽  
...  
Keyword(s):  
Aging Time ◽  
Hydrothermal Aging ◽  
Nh3 Scr ◽  
Mechanism Research ◽  
The Impact ◽  
Catalytic Deactivation ◽  
Deactivation Mechanism

Catalytic deactivation mechanism research over Cu/SAPO-34 catalysts for NH 3 -SCR (II): The impact of copper loading

2017 ◽  
Vol 168 ◽  
pp. 414-422 ◽  
Author(s):  
Jiaojiao Tang ◽  
Minhong Xu ◽  
Tie Yu ◽  
Hongfei Ma ◽  
Meiqing Shen ◽  
...  
Keyword(s):  
Mechanism Research ◽  
The Impact ◽  
Catalytic Deactivation ◽  
Deactivation Mechanism

scholarly journals The Hydrothermal Stability and the Properties of Non- and Strongly-Interacting Rh Species over Rh/γ, θ-Al2O3 Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 99
Author(s):  
Guanghao Cheng ◽  
Gurong Shen ◽  
Jun Wang ◽  
Yunhao Wang ◽  
Weibo Zhang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Apparent Activation Energy ◽  
Aging Time ◽  
Reaction Path ◽  
Aging Treatment ◽  
Hydrothermal Stability ◽  
Hydrothermal Aging ◽  
Strongly Interacting

The present work reports the effects of γ-, θ-phase of alumina on the hydrothermal stability and the properties of non- and strongly-interacting Rh species of the Rh/Al2O3 catalysts. Comparing to γ-Al2O3, θ-Al2O3 can not only reduce the amount of occluded Rh but also better stabilize Rh during hydrothermal aging treatment. When the aging time was prolonged to 70 h, all the non-interacting Rh was transformed into strongly-interacting Rh and occluded Rh. The XPS results indicated that non- and strongly-interacting Rh might exist in the form of Rh/Rh3+ and Rh4+, respectively. CO-NO reaction was chosen as a probe reaction to research more information about non- and strongly-interacting Rh. The two Rh species had similar apparent activation energy (Eapp) of 170 kJ/mol, which indicated that non- and strongly-interacting Rh follow the same reaction path. The non-interacting Rh was removed from aged samples by the acid-treated method, and obtained results showed that only 2.5% and 4.0% non-interacting Rh was maintained in aged Rh/γ-Al2O3 and Rh/θ-Al2O3.

Deactivation of Mn/TiO2 catalyst for NH3-SCR reaction: effect of phosphorous

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11226-11232 ◽  
Author(s):  
Ning-zhi Yang ◽  
Rui-tang Guo ◽  
Qing-shan Wang ◽  
Wei-guo Pan ◽  
Qi-lin Chen ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Tio2 Catalyst ◽  
Nh3 Scr ◽  
Deactivation Mechanism

The deactivation mechanism of phosphorous on a Mn/TiO2 catalyst for selective catalytic reduction of NO with NH3 was investigated in this study.

scholarly journals Pengembangan Metode Pengusangan Cepat Fisik Benih Pepaya (Carica papaya L.)

2019 ◽  
Vol 2 (3) ◽  
pp. 7
Author(s):  
Dyah Priandini ◽  
Muhamad Rahmad Suhartanto ◽  
Abdul Qadir
Keyword(s):  
Moisture Content ◽  
Aging Time ◽  
Seed Quality ◽  
Block Design ◽  
Accelerated Aging ◽  
Seed Moisture Content ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
The Impact ◽  
Papaya Seed

Development of papaya fruit production is influenced by the availability of seed quality. High seed quality is maintained during seed storage. Estimation of vigor in relation to storability can be detected by accelerated aging test. This research aims to develop physicall accelerated aging test by, 1)determine the impact of physical accelerated aging on vigor and viability parameters on papaya seed variety Callina and Sukma, 2) determine the levels of seed moisture content and effective period of physicall accelerated aging to predict vigor of papaya seed. This research was conducted at the Laboratory of Seed Science and Technology and Green House Leuwikopo, Department of Agronomy and Horticulture, IPB in January-May 2016 using a randomized complete block design with three replications. Seeds aged by the aging equipment MPC IPB 77-1 MMM. The results showed that the aging time decreased germination value in papaya seed variety Callina and Sukma with equation y=-0.1389x3+3.3333x2–25.25x+81.5 and y=0.0171x3+0.2028x2-9.9956x+81.095. Effective imbibition is 96 hour with moisture content 63-70% in both varieties. The effective of aging time treatment at 0x4, 1x4, 2x4, 3x4, dan 4x4 minutes.Keywords:imbibition, moisture content, viability, vigor

The effects of tungsten and hydrothermal aging in promoting NH3-SCR activity on V2O5/WO3-TiO2 catalysts

2018 ◽  
Vol 459 ◽  
pp. 639-646 ◽  
Author(s):  
Hongfeng Chen ◽  
Yang Xia ◽  
Ruyi Fang ◽  
Hui Huang ◽  
Yongping Gan ◽  
...  
Keyword(s):  
Hydrothermal Aging ◽  
Nh3 Scr

Hydrothermal aging alleviates the inhibition effects of NO2 on Cu-SSZ-13 for NH3-SCR

2020 ◽  
Vol 275 ◽  
pp. 119105 ◽  
Author(s):  
Yulong Shan ◽  
Yu Sun ◽  
Jinpeng Du ◽  
Yan Zhang ◽  
Xiaoyan Shi ◽  
...  
Keyword(s):  
Hydrothermal Aging ◽  
Nh3 Scr

Deactivation Characteristics of SCR Catalyst at Different Stages in Coal-Fired Flue Gas

2018 ◽  
Author(s):  
Zhiwen Xu ◽  
Yuxin Li ◽  
Yungang Wang ◽  
Hao Wang ◽  
Qinxin Zhao
Keyword(s):  
Alkali Metal ◽  
Flue Gas ◽  
Coal Combustion ◽  
Catalyst Deactivation ◽  
Chemical Form ◽  
Scr Catalyst ◽  
Deactivation Of Catalyst ◽  
The Impact ◽  
Deactivation Mechanism

Through analyzing the impact of the factors of catalyst deactivation, different factors are classified according to timeliness characteristics. In this research, experiments were made under the condition of coal combustion flue gas on a coal-fired boiler to study the characteristics of the early deactivation of the SCR catalyst. Analysis shows that the main cause of early deactivation of catalyst is chemical poisoning (mainly alkali metal) and pores clogging on the surface of the catalyst. While the main cause of long-term deactivation is deeper chemical poisoning, pores clogging and the chemical form changes of elements on the surface of the catalyst. Through analyzing the influence of the factors of catalyst deactivation, separate factors are classified according to timeliness characteristics. This research provides a strong fundamental support to clear the deactivation mechanism of the SCR catalyst.

Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts

2019 ◽  
Vol 4 (6) ◽  
pp. 1050-1058 ◽  
Author(s):  
Taekyung Ryu ◽  
Yonjoo Kang ◽  
In-Sik Nam ◽  
Suk Bong Hong
Keyword(s):  
High Activity ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Hydrothermal Aging ◽  
Reduction Of No ◽  
Nh3 Scr ◽  
Scr Catalysts ◽  
High Silica

Iron-exchanged high-silica LTA zeolites exhibit high activity for selective catalytic reduction of NOx by NH3, even after hydrothermal aging at 900 °C.

scholarly journals Fracture Resistance of Zirconia Oral Implants In Vitro: A Systematic Review and Meta-Analysis

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 562 ◽  
Author(s):  
Annalena Bethke ◽  
Stefano Pieralli ◽  
Ralf-Joachim Kohal ◽  
Felix Burkhardt ◽  
Manja von Stein-Lausnitz ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Static Loading ◽  
Fracture Resistance ◽  
Tetragonal Zirconia ◽  
Present Review ◽  
Hydrothermal Aging ◽  
Oral Implants ◽  
Electronic Screening ◽  
The Impact ◽  
Zirconia Implants

Various protocols are available to preclinically assess the fracture resistance of zirconia oral implants. The objective of the present review was to determine the impact of different treatments (dynamic loading, hydrothermal aging) and implant features (e.g., material, design or manufacturing) on the fracture resistance of zirconia implants. An electronic screening of two databases (MEDLINE/Pubmed, Embase) was performed. Investigations including > 5 screw-shaped implants providing information to calculate the bending moment at the time point of static loading to fracture were considered. Data was extracted and meta-analyses were conducted using multilevel mixed-effects generalized linear models (GLMs). The Šidák method was used to correct for multiple testing. The initial search resulted in 1864 articles, and finally 19 investigations loading 731 zirconia implants to fracture were analyzed. In general, fracture resistance was affected by the implant design (1-piece > 2-piece, p = 0.004), material (alumina-toughened zirconia/ATZ > yttria-stabilized tetragonal zirconia polycrystal/Y-TZP, p = 0.002) and abutment preparation (untouched > modified/grinded, p < 0.001). In case of 2-piece implants, the amount of dynamic loading cycles prior to static loading (p < 0.001) or anatomical crown supply (p < 0.001) negatively affected the outcome. No impact was found for hydrothermal aging. Heterogeneous findings of the present review highlight the importance of thoroughly and individually evaluating the fracture resistance of every zirconia implant system prior to market release.

A comparison of hydrothermal aging effects on NH3-SCR of NO over Cu-SSZ-13 and Cu-SAPO-34 catalysts

2015 ◽  
Vol 165 ◽  
pp. 438-445 ◽  
Author(s):  
Di Wang ◽  
Yasser Jangjou ◽  
Yong Liu ◽  
Munish K. Sharma ◽  
Jinyong Luo ◽  
...  
Keyword(s):  
Aging Effects ◽  
Hydrothermal Aging ◽  
Nh3 Scr ◽  
Scr Of No
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