Article
Chemistry, Applied
Jihene Arfaoui, Abdelhamid Ghorbel, Carolina Petitto, Gerard Delahay
Summary: The addition of Ce and/or W influences differently the structure, texture, crystallites size, surface oxygen concentration, total acidity and redox ability of aerogel samples and clearly affects their NO-SCR activity. It was found that cerium species are more active in the low temperature NO-SCR reaction than tungsten ones, and the NO conversion into N-2 reaches 85% at 300 degrees C and exceeds 90% between 320 and 400 degrees C over the WO3-CeO2-TiO2 catalyst.
JOURNAL OF POROUS MATERIALS
(2021)
Article
Engineering, Environmental
Yu-Xuan Li, Chong-Chen Wang, Huifen Fu, Peng Wang
Summary: The TiO2/MIL-125 core-shell composites were successfully prepared and exhibited superior photocatalytic performance, with the optimal MT-2 showing excellent activity in Cr(VI) reduction. Additionally, the formation of TiO2 nanosheets improved the separation efficiency of photo-induced carriers.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Min Seong Lee, Sun- Kim, Bora Jeong, Jin-Woo Park, Taehyo Kim, Jung Woo Lee, Gibum Kwon, Duck Hyun Lee
Summary: Research on coating an NH4+ layer on a vanadium-based catalyst can significantly improve its NOX removal efficiency over a wide temperature range, as well as enhance its proton conductivity, reducing the amount of vanadium oxides and tungsten oxide.
Article
Chemistry, Analytical
Jie Hu, Xueqing Xiong, Wangwang Guan, Haizhu Long, Lixiu Zhang, Haihang Wang
Summary: In this article, a novel flower-like WO3-In2O3 hollow heterostructure was successfully constructed and its gas sensing performance was systematically investigated. The results showed that the WO3-In2O3 structure achieved higher sensing performance compared to other sensing materials, attributed to the synergistic effect of its excellent structure and heterojunction configuration. This study provides new insights and strategies for improving the sensing performance of metal oxide semiconductor-based gas sensing materials.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Physical
Ming Cai, Xue Bian, Feng Xie, Wenyuan Wu, Peng Cen
Summary: The addition of PEO significantly affects the physical and chemical properties of the CeO2-WO3/TiO2 catalysts, improving their catalytic activity. PEO not only optimizes the pore structure of the catalysts but also enhances their adsorption and redox abilities.
Article
Chemistry, Multidisciplinary
Min Seong Lee, Yeong Jun Choi, Su-Jeong Bak, Mingyu Son, Jeehoon Shin, Duck Hyun Lee
Summary: Efficient selective catalytic reduction (SCR) catalysts were prepared using the polyol process, showing high nitrogen oxide (NOx) removal efficiency at low temperatures. The catalysts also had smaller particle size, which increased surface area and catalytic acid sites.
Article
Biotechnology & Applied Microbiology
Quanming Liang, Jian Li, Tao Yue
Summary: The addition of 3% CeO2 improved the performance and resistance of the V2O5-WO3/TiO2 catalyst by establishing a protective layer. The experiment showed that layered filling can slow down the catalyst's deactivation rate, and the deposition amounts of NH4+ and SO42- can be used as indicators for judging the degree of poisoning.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Chemistry, Multidisciplinary
Geumyeon Lee, Bora Ye, Myeung-jin Lee, Seung-Yeop Chun, Bora Jeong, Hong-Dae Kim, Jungho Jae, Taewook Kim
Summary: This study aims to produce more efficient catalysts for NOx removal by treating the TiO2 support with titanium isopropoxide (TTIP) to increase the number of catalytically active sites and facilitate the dispersal of active materials. The catalyst prepared at a TTIP loading of 5 wt% showed optimal performance due to increased thermal stability caused by high extent of W dispersion and the formation of V(4+) by the reaction of V5+ with surface Ti3+.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Physical
Yangyang Guo, Xiaofei Xu, Hong Gao, Yang Zheng, Lei Luo, Tingyu Zhu
Summary: The study compares the performance of V2O5-WO3/TiO2 and V2O5-WO3-CeO2/TiO2 catalysts with different calcium content in treating high-calcium content flue gas. The results show that Ce addition can promote NO conversion and enhance the alkali resistance of the catalyst, while lower calcium content is beneficial for improving the catalyst's oxidability. Calcium doping reduces the total acidity and reducibility of the catalyst, while Ce addition strengthens the reducibility of active species.
Article
Materials Science, Ceramics
Jong-Chan Lim, Changhyun Jin, Myung Sik Choi, Min Young Kim, Sang-il Kim, Soon-Mok Choi, Seung-Hyub Baek, Kyu Hyoung Lee, Hyun-Sik Kim
Summary: The research found that the response of Co-doped three-dimensional flower-like tungsten oxide nanoplates to ethanol gas sensing changes gradually according to the process temperature and Co doping concentration, influenced by a variety of complex factors. Therefore, in the field of ethanol gas sensing, analyzing various factors and predicting the results may be more important.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Dongrun Xu, Weiye Qu, Junhong Liu, Junxiao Chen, Xue Fang, Liwei Chen, Zhen Ma, Xi Liu, Xingfu Tang, Yaxin Chen
Summary: This study provides evidence that dinuclear vanadium-tungsten sites are the most active catalytic sites in conventional V2O5-WO3/TiO2 SCR catalysts, contrary to the prevailing view. These sites have stronger acidity and higher concentration of vanadium 3d electrons, leading to improved NH3 adsorption and O-2 activation in SCR. This finding settles a long-standing dispute and has important implications for understanding SCR mechanisms and designing better catalysts.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Engineering, Environmental
Xiaoli Yang, Na Li, Yiqiu Zhang, Morui Li, Mo Liu, Zimeng Tian, Qiulin Zhang, Jianjun Chen
Summary: The introduction of WO3 can enhance the density of Brönsted acid sites on the catalyst, promote the adsorption of NH3 molecules, and increase NH3 storage capacity, thus suppressing over-oxidation of NH3 and enhancing N-2 selectivity.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Se Won Jeon, Inhak Song, Hwangho Lee, Joonwoo Kim, Youngchul Byun, Dong Jun Koh, Do Heui Kim
Summary: In this study, a hybrid catalyst was introduced, which exhibited better stability and sulfur tolerance during SO2 aging. The hybrid catalyst achieved the direct migration of ammonium bisulfate from the vanadia domain to the alumina domain through physical contact, rather than gas-phase adsorption. The surface properties of the mixed alumina played an important role in its affinity to ammonium bisulfate and reusability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Bo Qin, Rui-tang Guo, Jue Zhou, Lin-gang Wei, Tian-yi Yin, Wei-guo Pan
Summary: A flower-like MnCe/TiO2 catalyst was synthesized via hydrothermal method and exhibited excellent SCR performance and resistance to SO2 and H2O. The catalyst possessed a larger surface area, higher Ce3+ and Mn4+ content, superior surface acidity and redox performance, which greatly improved the SCR performance.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Ming Cai, Xue Bian, Feng Xie, Wenyuan Wu, Peng Cen
Summary: The addition of glass fiber enhanced the adhesion and mechanical strength of CeO2-WO3/TiO2 catalyst, but the alkali metals in the fiber inhibited the active sites, affecting catalytic performance. Furthermore, the addition of glass fiber affected the formation of catalyst pore structure, reduced the content of active sites, and impacted the catalyst's redox abilities and adsorption capacity for nitrogen oxides and ammonia.