Surface Chemistry of Catalysis

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Topic Information

Dear Colleagues,

Pollution control has become a topic of global concern as it plays an essential role in human health and ecosystem functions. Separation and purification have been recognized as efficient technologies to remove pollutants from air or water. Catalysis is the fundamental process to perform sufficient separation or purification technology. In addition, the pendant surface chemistry of nanomaterial-based catalysts contributes to purification effectiveness. In consideration of the surface properties and chemistry of nanomaterial-based catalysts, we cordially invite you to contribute to this Topic entitled, “Surface Chemistry of Catalysis”. The major aim of this Topic is to collect recent original and innovative findings and developments on the synthesis and applications of catalysts and/or absorbents (e.g., noble metal nanoparticles, transition metals, and metal oxides).

It is my pleasure to invite you to submit a manuscript for this Topic. Prospective authors may consider the diverse applications of the above-mentioned categories of surface chemistry, such as catalysis, adsorption, and energy storage. I hope this Topic will provide readers with a selection of papers that represents the current state of knowledge on fundamentals and applications of purification technology.

Prof. Dr. Bin Xu
Dr. Yu Gong
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Batteries batteries	4.6	4.0	2015	22 Days	CHF 2700
Catalysts catalysts	3.8	6.8	2011	12.9 Days	CHF 2200
Nanomaterials nanomaterials	4.4	8.5	2010	13.8 Days	CHF 2900
Sustainability sustainability	3.3	6.8	2009	20 Days	CHF 2400
Molecules molecules	4.2	7.4	1996	15.1 Days	CHF 2700

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Published Papers (6 papers)

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All Batteries Catalysts Nanomaterials Sustainability Molecules

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13 pages, 4141 KiB  

Open AccessArticle

Optically Active Oxygen Defects in Titanium Dioxide Doped with Inorganic Acid Ions

by Bin Xu, Xuehui Duan, Tao Zhou, Jinliang Hao, Haotian Qin, Youcai Zhao, Wei Ye and Jianglin Cao

Nanomaterials 2024, 14(12), 1020; https://doi.org/10.3390/nano14121020 - 13 Jun 2024

Viewed by 770

Abstract

Doping inorganic acid ions represents a promising pathway to improving the photocatalytic activity of TiO₂, and oxygen vacancy has been regarded as the determinant factor for photocatalytic activity. A series of samples doped with Cl⁻, NO₃⁻, [...] Read more.

Doping inorganic acid ions represents a promising pathway to improving the photocatalytic activity of TiO₂, and oxygen vacancy has been regarded as the determinant factor for photocatalytic activity. A series of samples doped with Cl⁻, NO₃⁻, and SO₄²⁻ was prepared via a simple sol–gel method. Two different oxygen vacancies in the crystal layer of NO₃⁻/TiO₂ and Cl⁻/TiO₂ were found, and those are [Ti³⁺]-V₀-[Ti³⁺] and [Ti³⁺]-Cl, respectively. The photocurrent of NO₃⁻/TiO₂ with [Ti³⁺]-V₀-[Ti³⁺] is significantly greater than that of Cl⁻/TiO₂ with [Ti³⁺]-Cl. The least oxygen vacancy is in the gel layer of SO₄²⁻/TiO₂, and the negligible photocurrent is due to difficulty in forming a stable sol. Furthermore, the process conditions for the application of TiO₂ were investigated in this work. The optimal process parameters are to adjust the solution to pH = 3 during sol–gel preparation, to adopt 550 °C as the calcination temperature, and to use an alkaline electrolyte, while the rest of the preparation conditions remain unchanged. This work reveals a new avenue for designing efficient photocatalysts for air pollutant degradation. Full article

(This article belongs to the Topic Surface Chemistry of Catalysis)

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12 pages, 2708 KiB  

Open AccessArticle

Enhancing Oxygen Evolution Reaction with Two-Dimensional Nickel Oxide on Au (111)

by Handing Zhang, Haoyu Zhang, Ruijing Wang, Jiayu Lv, Wugen Huang, Chenyan Guo and Fan Yang

Catalysts 2024, 14(5), 284; https://doi.org/10.3390/catal14050284 - 23 Apr 2024

Viewed by 1151

Abstract

The nature of the active sites of transition metal oxides during the oxygen evolution reaction (OER) has attracted much attention. Herein, we constructed well-defined nickel oxide/Au (111) model catalysts to study the relationship between the structures and their OER activity using scanning tunneling [...] Read more.

The nature of the active sites of transition metal oxides during the oxygen evolution reaction (OER) has attracted much attention. Herein, we constructed well-defined nickel oxide/Au (111) model catalysts to study the relationship between the structures and their OER activity using scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), electrochemical measurements, and density functional theory (DFT) calculations. The deposited nickel oxides on Au (111) were found to exhibit a two-dimensional (2D)/three-dimensional (3D) structure by regulating the annealing temperature. Combining STM, XPS and electrochemical measurements, our results demonstrated an optimal OER reactivity could be achieved for NiO_x with a 2D structure on Au and provided a morphological description of the active phase during electrocatalysis. Full article

(This article belongs to the Topic Surface Chemistry of Catalysis)

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12 pages, 6636 KiB  

Open AccessArticle

FeO_x-Modified Ultrafine Platinum Particles Supported on MgFe₂O₄ with High Catalytic Activity and Promising Stability toward Low-Temperature Oxidation of CO

by Chanchan Wang, Fen Wang and Jianjun Shi

Molecules 2024, 29(5), 1027; https://doi.org/10.3390/molecules29051027 - 27 Feb 2024

Cited by 1 | Viewed by 804

Abstract

Catalytic oxidation is widely recognized as a highly effective approach for eliminating highly toxic CO. The current challenge lies in designing catalysts that possess exceptional low-temperature activity and stability. In this work, we have prepared ultrafine platinum particles of ~1 nm diameter dispersed [...] Read more.

Catalytic oxidation is widely recognized as a highly effective approach for eliminating highly toxic CO. The current challenge lies in designing catalysts that possess exceptional low-temperature activity and stability. In this work, we have prepared ultrafine platinum particles of ~1 nm diameter dispersed on a MgFe₂O₄ support and found that the addition of 3 wt.% FeO_x into the 3Pt/MgFe₂O₄ significantly improves its activity and stability. At an ultra-low temperature of 30 °C, the CO can be totally converted to CO₂ over 3FeO_x-3Pt/MgFe₂O₄. High and stable performances of CO-catalytic oxidation can be obtained at 60 °C on 3FeO_x-3Pt/MgFe₂O₄ over 35 min on-stream at WHSV = 30,000 mL/(g·h). Based on a series of characterizations including BET, XRD, ICP, STEM, H₂-TPR, XPS, CO-DRIFT, O₂-TPD and CO-TPD, it was disclosed that the relatively high activity and stability of 3FeO_x-3Pt/MgFe₂O₄ is due to the fact that the addition of FeO_x could facilitate the antioxidant capacity of Pt and oxygen mobility and increase the proportion of adsorbed oxygen species and the amounts of adsorbed CO. These results are helpful in designing Pt-based catalysts exhibiting higher activity and stability at low temperatures for the catalytic oxidation of CO. Full article

(This article belongs to the Topic Surface Chemistry of Catalysis)

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12 pages, 5442 KiB  

Open AccessArticle

Structure Robustness of Highly Dispersed Pt/Al₂O₃ Catalyst for Propane Dehydrogenation during Oxychlorination Regeneration Process

by Lu Dong, Yitong Sun, Yifan Zhou, Zhijun Sui, Yunsheng Dai, Yian Zhu and Xinggui Zhou

Catalysts 2024, 14(1), 48; https://doi.org/10.3390/catal14010048 - 10 Jan 2024

Cited by 2 | Viewed by 2145

Abstract

The structure and performance stability of a Pt-based catalyst for propane dehydrogenation during its reaction–regeneration cycles is one of the key factors for its commercial application. A 0.3% Pt/Al₂O₃ catalyst with a sub-nanometric particle size was prepared and two different [...] Read more.

The structure and performance stability of a Pt-based catalyst for propane dehydrogenation during its reaction–regeneration cycles is one of the key factors for its commercial application. A 0.3% Pt/Al₂O₃ catalyst with a sub-nanometric particle size was prepared and two different types of regeneration processes, long-term dichloroethane oxychlorination and a reaction–oxidation–oxychlorination cycle, were investigated on this catalyst. The fresh, sintered and regenerated catalyst was characterized by HAADF-STEM, CO-DRIFTS, XPS, CO chemisorption and N₂ physisorption, and its catalytic performance for propane dehydrogenation was also tested. The results show that the catalysts tend to have a similar particle size, coordination environment and catalytic performance with the extension of the regeneration time or an increase in the number of cycles in the two regeneration processes, and a common steady state could be achieved on the catalysts. This indicates that structure of the catalyst tends to approach its equilibrium state in the regeneration process, during which the utilization efficiency of Pt is maximized by increasing the dispersion of Pt and its intrinsic activity, and the structural robustness is secured. The performance of the catalyst is comparable to that of a single-atom Pt/Al₂O₃ catalyst. Full article

(This article belongs to the Topic Surface Chemistry of Catalysis)

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23 pages, 13972 KiB  

Open AccessArticle

Reaction Mechanism Development for Methane Steam Reforming on a Ni/Al₂O₃ Catalyst

by Jana Richter, Fabian Rachow, Johannes Israel, Norbert Roth, Evgenia Charlafti, Vivien Günther, Jan Ingo Flege and Fabian Mauss

Catalysts 2023, 13(5), 884; https://doi.org/10.3390/catal13050884 - 13 May 2023

Cited by 6 | Viewed by 4132

Abstract

In this work, a reliable kinetic reaction mechanism was revised to accurately reproduce the detailed reaction paths of steam reforming of methane over a Ni/Al${}_2$O${}_3$ catalyst. A steady-state fixed-bed reactor experiment and a 1D reactor catalyst model were utilized for [...] Read more.

In this work, a reliable kinetic reaction mechanism was revised to accurately reproduce the detailed reaction paths of steam reforming of methane over a Ni/Al${}_2$O${}_3$ catalyst. A steady-state fixed-bed reactor experiment and a 1D reactor catalyst model were utilized for this task. The distinctive feature of this experiment is the possibility to measure the axially resolved temperature profile of the catalyst bed, which makes the reaction kinetics inside the reactor visible. This allows for understanding the actual influence of the reaction kinetics on the system; while pure gas concentration measurements at the catalytic reactor outlet show near-equilibrium conditions, the inhere presented temperature profile shows that it is insufficient to base a reaction mechanism development on close equilibrium data. The new experimental data allow for achieving much higher quality in the modeling efforts. Additionally, by carefully controlling the available active surface via dilution in the experiment, it was possible to slow down the catalyst conversion rate, which helped during the adjustment of the reaction kinetics. To assess the accuracy of the revised mechanism, a monolith experiment from the literature was simulated. The results show that the fitted reaction mechanism was able to accurately predict the experimental outcomes for various inlet mass flows, temperatures, and steam-to-carbon ratios. Full article

(This article belongs to the Topic Surface Chemistry of Catalysis)

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13 pages, 6249 KiB  

Open AccessArticle

DRIFTS-MS Investigation of Low-Temperature CO Oxidation on Cu-Doped Manganese Oxide Prepared Using Nitrate Aerosol Decomposition

by Xingfan Gong, Jiacheng Xu, Tiantian Zhang, Yan Sun, Shiyu Fang, Ning Li, Jiali Zhu, Zuliang Wu, Jing Li, Erhao Gao, Wei Wang and Shuiliang Yao

Molecules 2023, 28(8), 3511; https://doi.org/10.3390/molecules28083511 - 16 Apr 2023

Cited by 5 | Viewed by 1825

Abstract

Cu-doped manganese oxide (Cu–Mn₂O₄) prepared using aerosol decomposition was used as a CO oxidation catalyst. Cu was successfully doped into Mn₂O₄ due to their nitrate precursors having closed thermal decomposition properties, which ensured the atomic ratio [...] Read more.

Cu-doped manganese oxide (Cu–Mn₂O₄) prepared using aerosol decomposition was used as a CO oxidation catalyst. Cu was successfully doped into Mn₂O₄ due to their nitrate precursors having closed thermal decomposition properties, which ensured the atomic ratio of Cu/(Cu + Mn) in Cu–Mn₂O₄ close to that in their nitrate precursors. The 0.5Cu–Mn₂O₄ catalyst of 0.48 Cu/(Cu + Mn) atomic ratio had the best CO oxidation performance, with T₅₀ and T₉₀ as low as 48 and 69 °C, respectively. The 0.5Cu–Mn₂O₄ catalyst also had (1) a hollow sphere morphology, where the sphere wall was composed of a large number of nanospheres (about 10 nm), (2) the largest specific surface area and defects on the interfacing of the nanospheres, and (3) the highest Mn³⁺, Cu⁺, and Oads ratios, which facilitated oxygen vacancy formation, CO adsorption, and CO oxidation, respectively, yielding a synergetic effect on CO oxidation. DRIFTS-MS analysis results showed that terminal-type oxygen (M=O) and bridge-type oxygen (M-O-M) on 0.5Cu–Mn₂O₄ were reactive at a low temperature, resulting in-good low-temperature CO oxidation performance. Water could adsorb on 0.5Cu–Mn₂O₄ and inhibited M=O and M-O-M reaction with CO. Water could not inhibit O₂ decomposition to M=O and M-O-M. The 0.5Cu–Mn₂O₄ catalyst had excellent water resistance at 150 °C, at which the influence of water (up to 5%) on CO oxidation could be completely eliminated. Full article

(This article belongs to the Topic Surface Chemistry of Catalysis)

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