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Crystals
Special Issues
Nanostructured Crystalline Catalysts
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Nanostructured Crystalline Catalysts

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 5216

Special Issue Editor

Dr. Apurba Sinhamahapatra

E-Mail Website
Guest Editor
Indian Institute of Technology (Indian School of Mines), Dhanbad, Dhanbad, India
Interests: nanostructured materials; artificial photosynthesis; solar energy; heterogeneous catalysis; CO2 utilization; reduced metal oxides (Black TiO2)

Special Issue Information

Dear Colleagues,

Expanding the catalytic environment to a nanostructure is one of the most promising ways to improve the performance of a catalyst. A better understanding of these nanoparticles’ size and shape effects and their interactions with the support materials is the key to many environmental, social, and industrial problems. The nanocatalyst is considered to be the most significant modern catalyst covering a wider range of applications extending from chemical manufacturing to energy transformation and environment protection to storage applications. The qualities that make them exceptionally dynamic and tough include but are not limited to high stability and activity, efficient selectivity, easily recoverability, low cost, and environmental friendliness. Moreover, in the crystalline phase, these nanocatalysts render more defects/vacancies, favoring the more rapid catalyst reduction, leading to a higher metal concentration on the surface and thereby projecting a higher activity and selectivity of the catalyst compared to conventional ones. Their characteristics are valued for the rational design of useful catalysts to be applied in diverse fields: heterogeneous catalysis, electrocatalysis, photocatalysis, environmental catalysis, biocatalysis, catalysis for biomass conversion, catalysis in organic and polymer chemistry, and computational catalysis. Despite being advantageous, the fundamental issues of nanocrystalline catalysts, including their stability and controllable synthesis, need to be explored more.

The current Special Issue aims to present a collection of reviews of the most recent research outcomes and original research papers in the field of crystalline nanomaterials catalysts. Potential research topics are not strictly limited to those in the aforementioned research fields: they can be from any other research field relevant to the synthesis, characterization, and catalytic application of crystalline nanomaterials.

Dr. Apurba Sinhamahapatra
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. Crystals 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 2100 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

  • nanocatalyst
  • nanostructure crystalline catalytic materials
  • metal catalyst
  • supported metal catalyst
  • computational catalysis
  • kinetics of catalytic reactions
  • photocatalysis
  • electrocatalysis
  • environmental catalysis
  • biocatalysis, enzymes, enzyme catalysis
  • catalysis for biomass conversion
  • organocatalysis, catalysis in organic and polymer chemistry

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Published Papers (2 papers)

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Research

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11 pages, 1635 KiB  
Article
Mn-Ce Oxide Nanoparticles Supported on Nitrogen-Doped Graphene for Low-Temperature Catalytic Reduction of NOx: De-Nitration Characteristics and Kinetics
by Shangrong Tan, Zhuo Yao, Hong Huang, Feng Liu, Zechen Liu and Xuyuan Wang
Crystals 2023, 13(2), 313; https://doi.org/10.3390/cryst13020313 - 14 Feb 2023
Cited by 6 | Viewed by 1692
Abstract
Selective catalytic reduction (SCR) of NOx with NH3 as the reductant has been proven an efficient and cost-effective technology to remove NOx pollutants in industries. Traditional SCR catalysts usually operate above 300 °C and suffer from intoxication and limited lifetime. [...] Read more.
Selective catalytic reduction (SCR) of NOx with NH3 as the reductant has been proven an efficient and cost-effective technology to remove NOx pollutants in industries. Traditional SCR catalysts usually operate above 300 °C and suffer from intoxication and limited lifetime. Nano-catalysts are attractive for their high catalytic activities at reduced operating temperatures. We have recently developed a series of nitrogen-doped graphene-supported Mn-Ce oxides (MnCeOx/NG). The influences of reaction temperature, space velocity, mole ratio of NH3/NO and O2 concentration on SCR de-nitration activity were assessed. The novel catalyst with optimal Mn/Ce ratio, at appropriate processing conditions, can achieve a NO conversion efficiency of 99.5% at a temperature of 180 °C, and 93.5% at 150 °C. The kinetics of the SCR reaction on this novel catalyst were also established, exhibiting first-order with respect to NO, zero-order to NH3, and nearly 0.5-order to O2 at low temperatures. In the presence of sufficient O2 content, the apparent activation energy of the NH3-SCR on MnCeOx/NG is 37.6 kJ/mol, which is promising for low-temperature applications. Full article
(This article belongs to the Special Issue Nanostructured Crystalline Catalysts)
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Review

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16 pages, 1563 KiB  
Review
The Use of Iron Ore as a Catalyst in Fischer–Tropsch Synthesis—A Review
by Chike George Okoye-Chine and Samuel Mubenesha
Crystals 2022, 12(10), 1349; https://doi.org/10.3390/cryst12101349 - 24 Sep 2022
Cited by 4 | Viewed by 3209
Abstract
The use of iron ore as an alternative to conventional Fischer–Tropsch synthesis (FTS) iron catalyst has been identified as a way to achieve a cost-effective catalyst. In recent times, considerable progress has been made to build a strong case for iron ore as [...] Read more.
The use of iron ore as an alternative to conventional Fischer–Tropsch synthesis (FTS) iron catalyst has been identified as a way to achieve a cost-effective catalyst. In recent times, considerable progress has been made to build a strong case for iron ore as a viable alternative to traditional iron catalysts. Nevertheless, there are still opportunities to enhance the current iron ore low-temperature Fischer–Tropsch (LTFT) catalysts and pave the way for optimal performing catalysts. In this study, we thoroughly examined the various publications on iron ore catalysts used for FTS and highlighted the research gaps in the studies. The study identified the progress made so far, opportunities, and challenges regarding the use of iron ore as a catalyst in FTS. One of the critical areas that needs to be addressed from the review is establishing the deactivation pathways of these catalyst systems. The application of advanced spectroscopic and computational methods is also suggested to elucidate the relationship between the synthesis conditions, active catalytic sites, reaction intermediates, and catalytic performance to fabricate optimized iron ore LTFT catalysts. Full article
(This article belongs to the Special Issue Nanostructured Crystalline Catalysts)
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