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Why catalyst used in dust form in chemical factory? 

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More importantly, we show that dust remains an active catalyst even in the coldest ISM.
Moreover, this catalyst shows a promising future in that it can provide environmentally clean processes for the chemical industry.
In this chemical recycling process, spent FCC catalyst used had an advantage with an economical and environment aspect, such as a low catalyst price in liquid-phase reaction and a reuse of waste catalyst.
Subsequent dust formation and/or growth is hampered by the shortage of chemical agents participating in the dust nucleation and the long timescale for accretion.
Moreover, it also facilitates the recycling of the catalyst and products produced in a chemical reaction.
It may be used also as a catalyst in other reactions.
Depositions of different species of dust on the catalyst surface have different influences on the ...
It could be used directly as a catalyst in many fields such as fuel cells.
Use of foundry dust in SCC resulted in high air content (7–10%), possibly due to reaction between foundry dust and the particular chemical admixtures used.
However, the spent catalyst has, generally, a good level of activity and can be used if mixed with fresh catalyst.

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What are the most common catalysts used in the industrial production of formaldehyde?4 answersThe most common catalysts used in the industrial production of formaldehyde are silver-based catalystsand metal oxide catalysts. Silver catalysts, particularly polycrystalline silver, are widely employed in the catalytic partial oxidation of methanol to formaldehyde. These catalysts offer excellent efficiency and stability, making them suitable for large-scale production. Metal oxide catalysts, such as iron molybdenum oxide and cobalt-alumina, are also utilized in formaldehyde production. These catalysts have been studied for their activities, selectivities, and stabilities in the formaldehyde synthesis process. Overall, silver-based catalysts and metal oxide catalysts are the primary choices in the industrial production of formaldehyde.
How to make catalyst?5 answersCatalysts can be prepared using various methods. One method involves melt-infiltrating a solid metal salt hydrate into a porous carbon support and heat-treating it under a reducing atmosphere, resulting in the formation of metal nanoparticles within the carbon support. Another method includes coating a catalyst precursor with an ALD-coating, specifically an Al2O3-layer, followed by a thermal treatment in the presence of nitrogen and subsequent cooling. A different approach involves mixing a core metal salt with a complexing agent to make a core metal complex solution, mixing a shell metal salt with a complexing agent to make a shell metal complex solution, and then mixing a carbon powder with a dispersant to make a carbon powder dispersion solution. This is followed by reduction processes, drying, oxidation, acidic treatment, and calcination to obtain a core-shell metal-carrying carbon powder catalyst. Yet another method includes soaking active carbon granules in deionized water, washing and drying them, soaking them in nitric acid and drying again, activating them in a nitrate solution, and finally roasting them in a heater to obtain the catalyst. Additionally, a catalyst production technology involves rotating a drum body with a carrier, spraying a dipping solution onto the carrier, and discharging evaporated gas through an exhaust port, resulting in a catalyst with stable quality.
What are catalysts used for chemical conversion of carbon dioxide to chemicals?5 answersCatalysts used for the chemical conversion of carbon dioxide to chemicals include transition metal-free catalysts or organocatalysts, noble and non-noble metal-based systems, noble-metal-free metal-organic frameworks (MOFs), and bimetallic nanoparticles. Transition metal-free catalysts or organocatalysts are attractive due to their green chemistry rules, cost-effectiveness, and avoidance of contamination. Noble and non-noble metal-based systems have been investigated for CO2 reduction, but achieving high faradaic efficiency, selectivity, and long-term stability remains challenging. Noble-metal-free MOFs are promising heterogeneous catalysts for CO2 thermocatalysis, with various valuable products obtained from their catalysis, such as cyclic carbonates, oxazolidinones, carboxylic acids, and more. MOFs and MOF-conjugates have shown excellent catalytic activity for the chemical fixation of CO2. Bimetallic nanoparticles, such as AuCu, supported on functionalized multiwalled carbon nanotubes, have been used for electrocatalytic reduction of CO2, resulting in high faradaic efficiency and selectivity.
How do chemical industry factories contribute to emissions?4 answersChemical industry factories contribute to emissions through their production processes and energy consumption. The production of chemicals, such as ethylene, ammonia, and chlorine, results in significant greenhouse gas emissions, particularly when considering the high emission intensities and production volumes of these processes. The use of fossil fuels, such as crude oil and coal, in the chemical industry also leads to direct greenhouse gas emissions. Additionally, the energy-intensive nature of the industry, along with the reliance on coal in certain regions, contributes to emissions associated with energy use. Efforts to reduce emissions in the chemical industry include exploring technological developments and improvements in energy efficiency, as well as the utilization of renewable energy and resources. Overall, the chemical industry's contribution to emissions is influenced by the specific processes involved, the energy sources used, and the adoption of emission reduction strategies.
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