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Catalysts
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Catalysis for Environmental and Renewable Energy Applications
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Catalysis for Environmental and Renewable Energy Applications

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

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 9428

Special Issue Editor

Dr. Rajabathar Jothi Ramalingam

E-Mail Website
Guest Editor
Department of Chemistry, College of Sciences, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
Interests: catalytic nanoparticle; hybrid nanoparticle composites; metal oxide composites

Special Issue Information

Dear Colleagues,

Catalysts are extensively used in different technologies and play a fundamental role in the efficient generation of renewable energy and pollution and gas emission control. The development of porous catalysts from low-cost methods with nano Architex structures could open new avenues in the field of the future catalysis industry. Despite the fact that catalysts have remarkable performance, they pose, in some cases, a negative environmental impact due to their massive use, which is imposed by intensive production strategies. Therefore, a reorientation in the search of new materials, such as environmentally friendly catalysts, is urgently needed. Hence, the development of novel EFCs to face sustainable energy production and climate change problems, as well as to abate industrial emissions, has become a challenge in the current research fields. The perovskites, metal-organic framework materials, and nanocarbon from waste plastic could be focused for the future.

A great variety of catalytic materials, which include single metals as well as mixed metals (and their oxides), is currently being used, either supported over alumina, silica, titania, ceria, zirconia, activated carbons, and zeolites. In a similar way to make alternative attractive materials with a lower cost and less polluting, side product methodology is the main focus of the present Special Issue.  Nanoparticles or nanomaterials with a porous nature research topic are also welcomed in this Special Issue.

Dr. Rajabathar Jothi Ramalingam
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. 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 2200 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

  • metal oxide
  • polymer composite
  • nanoparticles
  • porous materials
  • renewable energy
  • bio fuel
  • solar energy harvesting
  • biowaste catalyst
  • carbon dioxide reduction

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Published Papers (2 papers)

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20 pages, 5472 KiB  
Article
Biodiesel Production through the Transesterification of Waste Cooking Oil over Typical Heterogeneous Base or Acid Catalysts
by K. A. Viraj Miyuranga, Udara S. P. R. Arachchige, T. M. M. Marso and Gamunu Samarakoon
Catalysts 2023, 13(3), 546; https://doi.org/10.3390/catal13030546 - 9 Mar 2023
Cited by 23 | Viewed by 6728
Abstract
For the production of biodiesel from waste cooking oil with an acid value of 1.86 mg KOH/g, five heterogeneous catalysts—Ba(OH)2, CaO, MgO, ZnO, and AlCl3—were employed. To optimize the reaction parameters of each catalyst, the influence of crucial process [...] Read more.
For the production of biodiesel from waste cooking oil with an acid value of 1.86 mg KOH/g, five heterogeneous catalysts—Ba(OH)2, CaO, MgO, ZnO, and AlCl3—were employed. To optimize the reaction parameters of each catalyst, the influence of crucial process variables, such as catalyst loading, methanol-to-oil ratio, and reaction duration, was investigated. In addition, the effect of acetone as a cosolvent toward the progress of biodiesel production and the reusability of the heterogeneous catalysts were also examined, and the data were statistically evaluated with a 95% confidence level. Ba(OH)2 performed exceptionally well, with a 92 wt.% biodiesel yield, followed by CaO with an 84 wt.% yield. However, none of the results for MgO, ZnO, or AlCl3 were adequate. In addition, regardless of the type of catalyst utilized, adding 20 vol.% acetone to the biodiesel manufacturing process led to an increase in output. Furthermore, every heterogeneous catalyst was reusable, but only Ba(OH)2 and CaO produced a significant yield until the third cycle. The other catalysts did not produce yields of any significance. Full article
(This article belongs to the Special Issue Catalysis for Environmental and Renewable Energy Applications)
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11 pages, 1269 KiB  
Article
Ozone as a Catalyst of Surplus Activated Sludge Hydrolysis for the Biogas Production Enhancement
by Katarzyna Paździor, Marlena Domińska and Magdalena Olak-Kucharczyk
Catalysts 2022, 12(9), 1060; https://doi.org/10.3390/catal12091060 - 17 Sep 2022
Viewed by 2099
Abstract
The biogas produced in the methane fermentation is valuable due to its use as a renewable energy source. A promising method of biogas production intensification is sludge flocs disintegration via ozonation. The aim of this study was to check the impact of the [...] Read more.
The biogas produced in the methane fermentation is valuable due to its use as a renewable energy source. A promising method of biogas production intensification is sludge flocs disintegration via ozonation. The aim of this study was to check the impact of the ozonation on the efficiency and kinetics of biogas production from surplus activated sludge (SAS). Processes were carried out batchwise at 37 °C. The following analyses were performed: pH, alkalinity, dry matter, dry organic matter, chemical oxygen demand, total organic carbon, total nitrogen, elemental analysis (CHNS), the biochemical potential of methane by NIR spectroscopy, and the amount and composition of biogas. The results showed that the ozonation process had no effect on the elemental composition and chemical structure of SAS. The chemical formula of SAS (C2.97H4.68O1.20N0.3) and a simplified equation describing the methane fermentation process were determined. Ozonation caused the hydrolysis of some organic compounds from sludge flocs and increased the efficiency of biogas production. The methane content in biogas was higher by about 2.5%, while the amount of produced biogas rose by up to 21% for the ozonized sludge. The kinetic constants of first-order reaction were between 0.219 and 0.323 d−1, with an upward trend due to ozonation. Full article
(This article belongs to the Special Issue Catalysis for Environmental and Renewable Energy Applications)
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