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Advancements in Environmental Catalysis - The 19th National Congress on...
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Advancements in Environmental Catalysis - The 19th National Congress on Catalysis of China

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Environmental Catalysis".

Deadline for manuscript submissions: closed (31 August 2020) | Viewed by 22153

Special Issue Editors

Prof. Dr. Angelos M. Efstathiou

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Guest Editor
Heterogeneous Catalysis Laboratory, Chemistry Department, University of Cyprus, Nicosia 2109, Cyprus
Interests: transient kinetics; environmental catalysis; catalysis for energy; operando methodology; kinetics and mechanisms of heterogeneous catalytic reactions studied by transient isotopic techniques
Prof. Dr. Qiang Wang

grade E-Mail Website
Guest Editor
Environmental Functional Nanomaterials (EFN) Lab, College of Environmental Science and Engineering, Beijing Forestry University, P.O. Box 60, 35 Qinghua East Road, Haidian District, Beijing 100083, China
Interests: CO2 capture and utilization; environmental catalysis; functional materials; layered double hydroxide; nanocomposites
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yongjun Feng

E-Mail Website
Guest Editor
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology (BUCT), No. 15, Beisanhuan East Road, Chaoyang District, Beijing 100029, China
Interests: non-platinum metal electrocatalysts; oxygen reduction reaction (ORR); oxygen evolution reaction (OER); multifunctional layered nanomaterials; layered double hydroxides (LDHs); high-performance adsorption materials; removal of heavy metals and phosphate
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We would like to call for contributions to the Special Issue on "Advancements in Environmental Catalysis - The 19th National Congress on Catalysis of China", based on original recent works from the fundamentals towards industrial applications.

Authors with expertise in topics of catalytic elimination of environmental pollutants, such as NOx, CO, sulfur compounds, chlorinated and other organic compounds, solid particulates emitted from mobile or stationary sources, and whom presented their work at the 19th NCC of China as Oral or Posters, are cordially invited to submit their manuscripts to this Special Issue of Catalysts.

Prof. Dr. Angelos M. Efstathiou
Prof. Dr. Qiang Wang
Prof. Dr. Yongjun Feng
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • NOx reduction
  • Low-T NH3-SCR
  • H2-SCR
  • HC-SCR
  • Soot combustion
  • DeNOx technologies
  • VOC abatement technologies
  • Three-way catalysis
  • Lean-burn engines

Published Papers (7 papers)

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Research

14 pages, 46546 KiB  
Article
Selective Hydrogenation of Naphthalene over γ-Al2O3-Supported NiCu and NiZn Bimetal Catalysts
by Jingqiu Li, Liu Shi, Gang Feng, Zhangping Shi, Chenglin Sun and Dejin Kong
Catalysts 2020, 10(10), 1215; https://doi.org/10.3390/catal10101215 - 20 Oct 2020
Cited by 9 | Viewed by 2886
Abstract
A series of Cu and Zn modified Ni/Al2O3 catalysts were prepared using an incipient impregnation method for the selective hydrogenation of naphthalene into tetralin. X-ray diffraction (XRD), H2-Temperature programmed reduction (H2-TPR), transmission electron microscopy (TEM) and [...] Read more.
A series of Cu and Zn modified Ni/Al2O3 catalysts were prepared using an incipient impregnation method for the selective hydrogenation of naphthalene into tetralin. X-ray diffraction (XRD), H2-Temperature programmed reduction (H2-TPR), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were applied to reveal the structure regulation, and density functional theory (DFT) calculations were performed to investigate the electronic effect and reactant adsorptions on the active sites. The results showed that the addition of CuO promoted the hydrogenation of naphthalene with an inhibited tetraline selectivity. However, a simultaneously increasing naphthalene conversion and tetraline selectivity were achieved over the Zn modified Ni/Al2O3 catalysts. The characterization and calculation results revealed that the doping of CuO improved the hydrogenation activity with a low tetralin selectivity due to the H spillover from the Cu. The addition of ZnO decreased the interaction between NiOx and Al2O3 in NiZn/Al2O3 catalysts, which efficiently increased the reduction ability of NiOx species and, thus, improved the naphthalene hydrogenation activity. The electron transfer from ZnO to NiOx weakened the adsorption of tetraline and resulted in increased tetraline selectivity. This work provides insight into developing efficient catalysts for heavy aromatics conversions via rational surface engineering. Full article
(This article belongs to the Special Issue Advancements in Environmental Catalysis - The 19th National Congress on Catalysis of China)
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15 pages, 6983 KiB  
Article
Aqueous Miscible Organic LDH Derived Ni-Based Catalysts for Efficient CO2 Methanation
by Ziling Wang, Liang Huang, Tomas Ramirez Reina, Angelos M. Efstathiou and Qiang Wang
Catalysts 2020, 10(10), 1168; https://doi.org/10.3390/catal10101168 - 12 Oct 2020
Cited by 5 | Viewed by 2227
Abstract
Converting CO2 to methane via catalytic routes is an effective way to control the CO2 content released in the atmosphere while producing value-added fuels and chemicals. In this study, the CO2 methanation performance of highly dispersed Ni-based catalysts derived from [...] Read more.
Converting CO2 to methane via catalytic routes is an effective way to control the CO2 content released in the atmosphere while producing value-added fuels and chemicals. In this study, the CO2 methanation performance of highly dispersed Ni-based catalysts derived from aqueous miscible organic layered double hydroxides (AMO-LDHs) was investigated. The activity of the catalyst was found to be largely influenced by the chemical composition of Ni metal precursor and loading. A Ni-based catalyst derived from AMO-Ni3Al1-CO3 LDH exhibited a maximum CO2 conversion of 87.9% and 100% CH4 selectivity ascribed to both the lamellar catalyst structure and the high Ni metal dispersion achieved. Moreover, due to the strong Ni metal–support interactions and abundant oxygen vacancy concentration developed, this catalyst also showed excellent resistance to carbon deposition and metal sintering. In particular, high stability was observed after 19 h in CO2/H2 reaction at 360 °C. Full article
(This article belongs to the Special Issue Advancements in Environmental Catalysis - The 19th National Congress on Catalysis of China)
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14 pages, 2142 KiB  
Article
Electrocatalytic Degradation of Azo Dye by Vanadium-Doped TiO2 Nanocatalyst
by Jih-Hsing Chang, Yong-Li Wang, Cheng-Di Dong and Shan-Yi Shen
Catalysts 2020, 10(5), 482; https://doi.org/10.3390/catal10050482 - 28 Apr 2020
Cited by 13 | Viewed by 3402
Abstract
In this work, nano V/TiO2 catalysts at different molar ratios were prepared and fabricated as the electrocatalytic electrodes for electrocatalytic degradation. The effect of the vanadium doping on the surface morphology, microstructural, and specific surface area of V/TiO2 catalysts was probed [...] Read more.
In this work, nano V/TiO2 catalysts at different molar ratios were prepared and fabricated as the electrocatalytic electrodes for electrocatalytic degradation. The effect of the vanadium doping on the surface morphology, microstructural, and specific surface area of V/TiO2 catalysts was probed by field emission scanning electron microscope (FESEM) x-ray diffractometer (XRD), and Brunauer–Emmett–Teller (BET), respectively. Afterward, the solution of Acid Red 27 (AR 27, one kind of azo dye) was treated by an electrocatalytic system in which the nano V/TiO2 electrode was employed as the anode and graphite as the cathode. Results demonstrate that AR 27 can be effectively degraded by the nano V/TiO2 electrodes; the highest removal efficiency of color and total organic carbon (TOC) reached 99% and 76%, respectively, under 0.10 VT (molar ratio of vanadium to titanium) condition. The nano V/TiO2 electrode with high specific surface area facilitated the electrocatalytic degradation. The current density of 25 mA cm−2 was found to be the optimum operation for this electrocatalytic system whereas the oxygen was increased with the current density. The electricity consumption of pure TiO2 and nano V/TiO2 electrode in this electrocatalytic system was around 0.11 kWh L−1 and 0.02 kWh L−1, respectively. This implies that the nano V/TiO2 electrode possesses both high degradation and energy saving features. Moreover, the nono V/TiO2 electrode shows its possible repeated utilization. Full article
(This article belongs to the Special Issue Advancements in Environmental Catalysis - The 19th National Congress on Catalysis of China)
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18 pages, 4150 KiB  
Article
Simultaneous Catalysis of Sulfite Oxidation and Uptake of Heavy Metals by Bifunctional Activated Carbon Fiber in Magnesia Desulfurization
by Yuguo Wang, Tieyue Qi, Mengxuan Hu, Yu Yang, Lei Xing and Lidong Wang
Catalysts 2020, 10(2), 244; https://doi.org/10.3390/catal10020244 - 18 Feb 2020
Cited by 7 | Viewed by 2972
Abstract
Sulfite and heavy metals are crucial pollutants in the slurry produced by flue gas desulfurization. In this study, a novel cobalt-based activated carbon fiber (Co-ACFs) catalyst-adsorbent was synthesized using an impregnation method; this bifunctional catalyst-adsorbent was used in wet magnesia desulfurization for the [...] Read more.
Sulfite and heavy metals are crucial pollutants in the slurry produced by flue gas desulfurization. In this study, a novel cobalt-based activated carbon fiber (Co-ACFs) catalyst-adsorbent was synthesized using an impregnation method; this bifunctional catalyst-adsorbent was used in wet magnesia desulfurization for the simultaneous catalytic oxidation of magnesium sulfite and uptake of heavy metal (Hg2+, Cd2+, and Ni2+) ions. The morphology and surface chemistry of ACFs before and after cobalt loading were investigated using various characterization methods. The kinetics on catalytic oxidation of magnesium sulfite was investigated, and the effects of operation conditions on the simultaneous adsorption capacity of heavy metals were examined. Relative to a non-catalysis material, the 40% Co-ACFs material increased the oxidation rate of magnesium sulfite by more than five times. The Langmuir model can describe the adsorption behavior of Co-ACFs on Hg2+, Cd2+, and Ni2+, indicating that the simultaneous uptake of heavy metals is a single-layer adsorption process. The maximum adsorption capacities for Hg2+, Cd2+, and Ni2+ are 333.3, 500, and 52.6 mg/g, respectively. A pseudo-second-order model confirmed that the removal of heavy metals is controlled by the chemisorption process. Full article
(This article belongs to the Special Issue Advancements in Environmental Catalysis - The 19th National Congress on Catalysis of China)
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10 pages, 3087 KiB  
Article
The Poisoning of V2O5-WO3/TiO2 and V2O5-Ce(SO4)2/TiO2 SCR Catalysts by KCl and The Partial Regeneration by SO2
by Hua Nie, Wei Li, Qirong Wu, Vladislav Rac, Vesna Rakić and Xuesen Du
Catalysts 2020, 10(2), 207; https://doi.org/10.3390/catal10020207 - 08 Feb 2020
Cited by 13 | Viewed by 3173
Abstract
Poisoning effects by alkali metal chlorides is one of the major reasons for the deactivation of SCR catalyst in biomass-fired plants. In this study, the influence of KCl on two vanadium-based catalysts with different promoters, V2O5-WO3/TiO2 [...] Read more.
Poisoning effects by alkali metal chlorides is one of the major reasons for the deactivation of SCR catalyst in biomass-fired plants. In this study, the influence of KCl on two vanadium-based catalysts with different promoters, V2O5-WO3/TiO2 and V2O5-Ce(SO4)2/TiO2, was investigated. The catalytic activity of the fresh V2O5-WO3/TiO2 was higher than that of V2O5-Ce(SO4)2/TiO2 at low temperatures. V2O5-Ce(SO4)2/TiO2 performed better than V2O5-WO3/TiO2 when KCl was deposited on the catalyst surface. Both poisoned catalysts were efficiently regenerated by SO2 treatment. The characterization results show that the reducibility and acidity of the catalysts were weakened by KCl deposition but regenerated by SO2. Full article
(This article belongs to the Special Issue Advancements in Environmental Catalysis - The 19th National Congress on Catalysis of China)
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17 pages, 5049 KiB  
Article
DeNOx of Nano-Catalyst of Selective Catalytic Reduction Using Active Carbon Loading MnOx-Cu at Low Temperature
by Tao Zhu, Xing Zhang, Wenjing Bian, Yiwei Han, Tongshen Liu and Haibing Liu
Catalysts 2020, 10(1), 135; https://doi.org/10.3390/catal10010135 - 18 Jan 2020
Cited by 9 | Viewed by 3291
Abstract
With the improvement of environmental protection standards, selective catalytic reduction (SCR) has become the mainstream technology of flue gas deNOx. Especially, the low-temperature SCR nano-catalyst has attracted more and more attention at home and abroad because of its potential performance and [...] Read more.
With the improvement of environmental protection standards, selective catalytic reduction (SCR) has become the mainstream technology of flue gas deNOx. Especially, the low-temperature SCR nano-catalyst has attracted more and more attention at home and abroad because of its potential performance and economy in industrial applications. In this paper, low-temperature SCR catalysts were prepared using the activated carbon loading MnOx-Cu. Then, the catalysts were packed into the fiedbed stainless steel micro-reactor to evaluate the selective catalytic reduction of NO performance. The influence of reaction conditions was investigated on the catalytic reaction, including the MnOx-Cu loading amount, calcination and reaction temperature, etc. The experimental results indicate that SCR catalysts show the highest catalytic activity for NO conversion when the calcination temperature is 350 °C, MnOx loading amount is 5%, Cu loading amount is 3%, and reaction temperature is 200 °C. Under such conditions, the NO conversion arrives at 96.82% and the selectivity to N2 is almost 99%. It is of great significance to investigate the influence of reaction conditions in order to provide references for industrial application. Full article
(This article belongs to the Special Issue Advancements in Environmental Catalysis - The 19th National Congress on Catalysis of China)
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16 pages, 4170 KiB  
Article
Encapsulated Ni@La2O3/SiO2 Catalyst with a One-Pot Method for the Dry Reforming of Methane
by Luhui Wang, Rong Hu, Hui Liu, Qinhong Wei, Dandan Gong, Liuye Mo, Hengcong Tao and Zhonghuai Zhang
Catalysts 2020, 10(1), 38; https://doi.org/10.3390/catal10010038 - 28 Dec 2019
Cited by 17 | Viewed by 3507
Abstract
Ni nanoparticles encapsulated within La2O3 porous system (Ni@La2O3), the latter supported on SiO2 (Ni@La2O3)/SiO2), effectively inhibit carbon deposition for the dry reforming of methane. In this study, Ni@La2 [...] Read more.
Ni nanoparticles encapsulated within La2O3 porous system (Ni@La2O3), the latter supported on SiO2 (Ni@La2O3)/SiO2), effectively inhibit carbon deposition for the dry reforming of methane. In this study, Ni@La2O3/SiO2 catalyst was prepared using a one-pot colloidal solution combustion method. Catalyst characterization demonstrates that the amorphous La2O3 layer was coated on SiO2, and small Ni nanoparticles were encapsulated within the layer of amorphous La2O3. During 50 h of dry reforming of methane at 700 °C and using a weight hourly space velocity (WHSV) of 120,000 mL gcat−1 h−1, the CH4 conversion obtained was maintained at 80%, which is near the equilibrium value, while that of impregnated Ni–La2O3/SiO2 catalyst decreased from 63% to 49%. The Ni@La2O3/SiO2 catalyst exhibited very good resistance to carbon deposition, and only 1.6 wt% carbon was formed on the Ni@La2O3/SiO2 catalyst after 50 h of reaction, far lower than that of 11.5 wt% deposited on the Ni–La2O3/SiO2 catalyst. This was mainly attributed to the encapsulated Ni nanoparticles in the amorphous La2O3 layer. In addition, after reaction at 700 °C for 80 h with a high WHSV of 600,000 mL gcat−1 h−1, the Ni@La2O3/SiO2 catalyst exhibited high CH4 conversion rate, ca. 10.10 mmol gNi−1 s−1. These findings outline a simple synthesis method to prepare supported encapsulated Ni within a metal oxide porous structure catalyst for the dry reforming of methane reaction. Full article
(This article belongs to the Special Issue Advancements in Environmental Catalysis - The 19th National Congress on Catalysis of China)
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