List of Articles Catalyst

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  1 - Urban Catalyst: Concepts and Requirements
  Nahid Nematikutenaee Farzaneh Salami farideh Asadian
  Today, urban transformations have led to general changes due to increasing sensitivities to human and environmental well-being. So far, there have been many approaches to urban transformation that most notably of them include urban revitalization, urban redevelopment, a More

  Today, urban transformations have led to general changes due to increasing sensitivities to human and environmental well-being. So far, there have been many approaches to urban transformation that most notably of them include urban revitalization, urban redevelopment, and urban regeneration. Regeneration approach has a more comprehensive and integrated vision for solving urban problems, especially Brownfield which has many opportunities for urban transformation and improving people's quality of life. But its regeneration faces challenges in clean-up and redevelopment. To overcome these challenges, the strategy of urban catalyst can be applied due to being an instrument within the strategies of urban transformation that comes out of the texture and rehabilitates that. This research presents the concepts and basic requirements of urban catalyst projects and their planning (political, management and leadership, legal, economic, social and environmental), design (underlying factors, Sense of location and identity) and implementation (4Ps model or public-private-people partnership) components for the acceleration of urban development. At the end, with the knowledge that every city has unique characteristic and it is not possible to adopt a single instruction for all cities, however, regarding to the global experiences, a common Brownfield regeneration process with the help of urban catalyst projects is presented by a proposed model in this study. If projects are understood and developed in accordance with what the city needs, they can deeply affect on the inefficient urban areas regeneration especially Brownfield. Manuscript profile
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  2 - Photo-transformation of hydrogen sulfide environmental pollutant to hydrogen fuel using a carbon-based magnetic nanocomposite catalyst
  Majid Ghanimati Mohsen Lashgari Mahchehreh Sabeti
  Hydrogen sulfide is a dangerous, corrosive and flammable environmental pollutant that is generated at large scale in sour oil and gas industries. One of the sustainable strategies to remove this environmental pollutant and convert it into hydrogen clean fuel is the use More

  Hydrogen sulfide is a dangerous, corrosive and flammable environmental pollutant that is generated at large scale in sour oil and gas industries. One of the sustainable strategies to remove this environmental pollutant and convert it into hydrogen clean fuel is the use of a renewable energy source (photon) and synthesis of semiconducting nanoenergy materials. To this end, in the present project, a nanostructured magnetic semiconducting MgFe2O4 compound was synthesized and applied for the production of hydrogen fuel through photocatalytic splitting of an alkaline H2S solution. The empirical evidence revealed that the synthesized material has an appropriate potency to reduce proton and produce hydrogen. Furthermore, by the synthesis of CNT/MgFe2O4 magnetic nanocomposite, the boosting effect of carbon nanotube (CNT) on the activity of the aforementioned photocatalyst was examined. A significant promotion in hydrogen production was observed in the presence of CNT and justified in terms of increasing the photocatalyst surface area, retarding the electron-hole recombination process and enhancing the photon absorption. The rate of hydrogen evolution was 1284 µmole/h per 0.2 g photocatalyst, indicating that the synthesized nanocomposite material has a high ability to remove the pollutant and produce hydrogen fuel. Manuscript profile
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  3 - Removal of Methylene blue dye from water by using Fe-BTC
  reza alizadeh
  Fe-BTC (benzene tricarboxylic) synthesized by ultrasonic irradiation as a novel photo catalyst was investigated for degradation of methylene blue (MB)by UV/ photo catalyst system. In this study, for the first time, a facile ultrasonic method was employed to prepare Fe-B More

  Fe-BTC (benzene tricarboxylic) synthesized by ultrasonic irradiation as a novel photo catalyst was investigated for degradation of methylene blue (MB)by UV/ photo catalyst system. In this study, for the first time, a facile ultrasonic method was employed to prepare Fe-BTC. The effects of temperature (50 and 70 °C) and irradiation time (90 and 120 min) were investigated to get the optimum photo catalyst. The nanoparticles of the synthesized Fe-BTC obtained were smaller and more homogeneous than those previously reported. The synthesized Fe-BTC samples showed good photocatalytic performance. The Fe-BTC 70-120 sample has shown the highest photocatalytic activity. The enhanced photocatalytic performance was related to two important factors which are the inhibition of the recombination process of the charge carriers and also the increase in the total area of the photo catalyst. The kinetics of degradation in this study has followed Langmuir-Hinshelwood pseudo-first-order theory. The Fe-BTC70-120 sample due to smaller particles and lower electron-hole recombination showed the highest photocatalytic degradation. The results of the mechanism showed the reactivity of hydroxyl radical oxidation in methylene blue degradation. The stability test also showed the high stability of Fe-BTC70-120 sample for three cycles. Photocatalytic degradation of MB by Fe-BTC with high activity and recycling stability may provide a new choice for wastewater treatment Manuscript profile
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  4 - studing two important technologies of propane dehydrogenation technology and the necessity of using this technology in the Iranian petrochemical industry
  Mohammad Mehdi Barjesteh Hossein Zamani
  Petrochemical industry is a branch of chemical industry that uses raw materials in the form of oil and gas to produce industrial products. Various chemical or physical processes are used to produce optimal products. Among the key and strategic products in the petrochemi More

  Petrochemical industry is a branch of chemical industry that uses raw materials in the form of oil and gas to produce industrial products. Various chemical or physical processes are used to produce optimal products. Among the key and strategic products in the petrochemical industry, we can mention propylene and polypropylene. Propane dehydrogenation (PDH-Propane dehydrogenation) is a highly efficient catalytic technology that is used to convert propane into propylene and finally polypropylene, and it has received wide attention today. Propylene is one of the intermediate products used in many petrochemical applications, such as the production of polypropylene resins, acrylic acids, propylene glycol, acrylonitrile, cumene/phenol and other industrial products. Usually, propylene is obtained by cracking naphtha derived from oil and is a byproduct of ethylene production, but currently, in order to produce propylene more widely, propane dehydrogenation process is used. With the increase in global demand for propylene in the automotive sector, the production of bottle caps, fabrics, packaging materials and the production of chemicals, the petrochemical industry is inevitably moving towards the targeted production of propylene. This goal will be achieved mainly through propane dehydrogenation, where propane is selectively hydrogenated (removal of hydrogen from the propane stream). The results of this research, in addition to identifying the most suitable method of producing propylene from propane (Oleflex or Catofin), indicate that the implementation of PDH projects in the country, in addition to meeting the needs of domestic industries, completing the chains It will also bring value to the country's petrochemical industry. Manuscript profile
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  5 - Elucidation of Factors and the Role of Drivers Influencing Development Stimulus Initiatives in the Pattern of Sustainable Regeneration with an Emphasis on Spatial Autocorrelation Analysis (Case Study: Kohsar City)
  Ahmad Pourahmad Media Hakimi Keramatalah Zayyari hasanali farajisabokbar
  In recent decades, the urban regeneration approach has shifted from physical renewal towards sustainable urban regeneration as a result of the evolution of thoughts and policies. The goal is to achieve economic growth, social dynamism, improved urban environmental quali More

  In recent decades, the urban regeneration approach has shifted from physical renewal towards sustainable urban regeneration as a result of the evolution of thoughts and policies. The goal is to achieve economic growth, social dynamism, improved urban environmental quality, and ecological sustainability. Inefficient urban fabric is identified as the primary target area for the regeneration of urban zones facing numerous economic, social, physical, and environmental challenges compared to other urban areas. One crucial solution in this regard involves harnessing developmental stimuli through a series of urban initiatives and plans to address the issues in various domains of urban areas. The purpose of this research is to identify the factors of catalyst and description of their role in the model of sustainable regeneration in Kohsar city, which is one of the most important inefficient urban areas in Alborz province. Therefore, identifying the drivers of development stimuli, elucidating their spatial distribution, and explaining their role in sustainable urban regeneration are paramount. The research methodology employed is descriptive, utilizing quantitative and qualitative analyses with a focus on GIS software and employing the Moran's I autocorrelation technique. The results indicate that the physical, social, and environmental criteria are clustered, while the economic criterion is randomly and unevenly distributed in Kohsar city. The finding of the research show that in the city of Kohsar , concentrating on the economic, social, physical, and environmental capacities of the existing urban areas and distributing them in inefficient areas can play a crucial role in accelerating the process of sustainable regeneration and addressing the challenges of inefficient urban fabric. Manuscript profile