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Heterogeneous Catalysts: Preparation and Application
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Heterogeneous Catalysts: Preparation and Application

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 3792

Special Issue Editor

Dr. Zahra Gholami

E-Mail Website
Guest Editor
Unipetrol Centre of Research and Education, a.s, Areál Chempark 2838, Záluží 1, 436 70 Litvínov, Czech Republic
Interests: catalysis; environmental catalysis; reaction engineering; green fuel production; adsorption; wastewater engineering
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The important role of catalysts as a reaction accelerator is well known, and numerous types of catalysts are used in chemical reactions, such as air pollution control, gas cleaning, energy and fuel production, combustion, production of high-value chemicals, etc. In addition to the reaction parameters, the catalytic performance is also affected by the catalyst preparation methods and its physicochemical properties. Therefore, the development of the catalyst with appropriate properties for specific reactions has been a topic of interest among researchers for many years.

This Special Issue “Heterogeneous Catalysts: Preparation and Application” covers contributions in the fields of heterogeneous catalysis with an emphasis on a new understanding of catalysts and catalytic materials, the synthesis, analysis, and catalytic function of heterogeneous catalysts, structural characterizations, and novel concepts in surface chemistry. This Special Issue welcomes original, novel, and high-impact contributions in the fields mentioned above. The submitted manuscript should cover sufficient details of the methods, catalyst characterization results, reactions, reactants, and products.

Dr. Zahra Gholami
Guest Editor

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. Materials is an international peer-reviewed open access semimonthly 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 2600 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

  • heterogeneous catalyst
  • mixed oxide
  • preparation methods
  • catalyst characterizations
  • metal–support interactions
  • high-value chemicals
  • environmental catalysts
  • energy and fuel

Published Papers (2 papers)

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Research

13 pages, 8222 KiB  
Article
Aluminum Doped Titania as a Support of Copper Catalysts for SCR of Nitrogen Oxides
by Wojciech Guziewicz, Anna Białas, Bogna D. Napruszewska, Małgorzata Zimowska and Jacek Gurgul
Materials 2021, 14(20), 6021; https://doi.org/10.3390/ma14206021 - 13 Oct 2021
Cited by 1 | Viewed by 1360
Abstract
Aluminum doped titania samples were synthesized as supports of copper oxide catalysts for NO reduction with ammonia. Samples were prepared by the sol-gel method with various ratios of aluminum to titanium. Their thermal stability was examined by TG/DSC methods which revealed that precursors [...] Read more.
Aluminum doped titania samples were synthesized as supports of copper oxide catalysts for NO reduction with ammonia. Samples were prepared by the sol-gel method with various ratios of aluminum to titanium. Their thermal stability was examined by TG/DSC methods which revealed that precursors were decomposed at 450 °C. The XRD measurements showed that aluminum caused the diminishing of titania crystallites and was built into the anatase structure or formed an amorphous phase. The admixture of aluminum in titania resulted in a significant increase in specific surface area of mesoporous supports as determined by low temperature sorption of nitrogen. Results of the catalytic tests over copper/aluminum-titania samples obtained by impregnation pointed out that the addition of aluminum broadened the temperature window of high catalytic activity. The increase in Al concentration shifted the temperature of maximum activity to higher values, and at the same time lowered nitrous oxide formation as well. Better catalytic efficiency could result from high copper dispersion on the catalysts surface, as well as the synergistic interaction between Ti and Cu causing reduction in CuO species as confirmed by XPS measurements. It was shown that copper was present as Cu+ species mainly, forming Cu-O-Ti bonds on the catalysts surface. Full article
(This article belongs to the Special Issue Heterogeneous Catalysts: Preparation and Application)
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12 pages, 3131 KiB  
Article
Preparation and Performance Evaluation of Platinum Barium Hexaaluminate Catalyst for Green Propellant Hydroxylamine Nitrate Thrusters
by Shinjae Kang and Sejin Kwon
Materials 2021, 14(11), 2828; https://doi.org/10.3390/ma14112828 - 25 May 2021
Cited by 4 | Viewed by 1893
Abstract
Spacecraft have monopropellant thruster systems for attitude control in the vacuum of space. Hydroxylamine nitrate is a green propellant that has high performance and low toxicity. Owing to the high adiabatic decomposition temperature of the hydroxylamine nitrate propellant, it is necessary to develop [...] Read more.
Spacecraft have monopropellant thruster systems for attitude control in the vacuum of space. Hydroxylamine nitrate is a green propellant that has high performance and low toxicity. Owing to the high adiabatic decomposition temperature of the hydroxylamine nitrate propellant, it is necessary to develop a catalyst with high thermal stability. We used a platinum barium hexaaluminate catalyst for green propellant hydroxylamine nitrate thrusters. Barium hexaaluminate support was prepared by a wet impregnation method and heat treatment. Platinum, the active material, was coated on catalyst supports. The Brunauer–Emmett–Teller specific surface was also investigated. X-ray diffraction and scanning electron microscope imagery were used to confirm the formation of barium hexaaluminate. A hydroxylamine nitrate propellant blended with methanol was used for performance evaluation via firing tests of the thruster. The catalytic decomposition performance of each test was evaluated by calculating the characteristic velocity efficiency using the pressure of the chamber at the end of the catalyst bed and the mass flow rate of the propellant. As the catalyst bed was preheated to 350 °C, the characteristic velocity efficiency was 71.9%. Test results revealed that the platinum barium hexaaluminate catalyst is feasible for a hydroxylamine nitrate thruster. Full article
(This article belongs to the Special Issue Heterogeneous Catalysts: Preparation and Application)
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