scholarly journals Noble-Metal-Based Catalytic Oxidation Technology Trends for Volatile Organic Compound (VOC) Removal

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 63
Author(s):  
Hyo-Sik Kim ◽  
Hyun-Ji Kim ◽  
Ji-Hyeon Kim ◽  
Jin-Ho Kim ◽  
Suk-Hwan Kang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Noble Metal ◽  
Noble Metals ◽  
Catalytic Mechanism ◽  
Coke Formation ◽  
Metal Catalysts ◽  
Voc Removal ◽  
Noble Metal Catalysts ◽  
Voc Combustion ◽  
Volatile Organic

Volatile organic compounds (VOCs) are toxic and are considered the most important sources for the formation of photochemical smog, secondary organic aerosols (SOAs), and ozone. These can also greatly affect the environment and human health. For this reason, VOCs are removed by applying various technologies or reused after recovery. Catalytic oxidation for VOCs removal is widely applied in the industry and is regarded as an efficient and economical method compared to other VOCs removal technologies. Currently, a large amount of VOCs are generated in industries with solvent-based processes, and the ratio of aromatic compounds is high. This paper covers recent catalytic developments in VOC combustion over noble-metal-based catalysts. In addition, this report introduces recent trends in the development of the catalytic mechanisms of VOC combustion and the deactivation of catalysts, such as coke formation, poisoning, sintering, and catalyst regeneration. Since VOC oxidation by noble metal catalysts depends on the support of and mixing catalysts, an appropriate catalyst should be used according to reaction characteristics. Moreover, noble metal catalysts are used together with non-noble metals and play a role in the activity of other catalysts. Therefore, further elucidation of their function and catalytic mechanism in VOC removal is required.

Catalytic oxidation of dimethyl phthalate over titania-supported noble metal catalysts

2021 ◽  
Vol 401 ◽  
pp. 123274
Author(s):  
Yuting Liang ◽  
Jiayi Li ◽  
Yaoyu He ◽  
Zhi Jiang ◽  
Wenfeng Shangguan
Keyword(s):  
Catalytic Oxidation ◽  
Noble Metal ◽  
Metal Catalysts ◽  
Dimethyl Phthalate ◽  
Noble Metal Catalysts

Control of S.I. Engine Exhaust Emissions Using Non-Precious Catalyst (ZSM-5) Supported Bimetals and Noble Metals as Catalyst

2005 ◽  
Author(s):  
Bankim B. Ghosh ◽  
Prokash Chandra Roy ◽  
Mita Ghosh ◽  
Paritosh Bhattacharya ◽  
Rajsekhar Panua ◽  
...  
Keyword(s):  
Noble Metal ◽  
Noble Metals ◽  
Bimetallic Catalyst ◽  
Catalytic Converter ◽  
Exhaust Emissions ◽  
Metal Catalysts ◽  
Oxides Of Nitrogen ◽  
Noble Metal Catalysts ◽  
Maximum Reduction ◽  
Wide Range

Three Way Catalysts (TWC) are extensively used for simultaneous control of three principal automotive pollutants, namely carbon monoxide (CO), Oxides of nitrogen (NOx), and hydrocarbon (HC). Most of works on three way catalytic converter have been carried out with noble metals such as Platinum, Rhodium, and Iridium have been tried individually and in different combinations and proportions. Noble metal catalysts give very good performance of reduction of (NOx), CO and HC in the narrow range of stoichiometric Air Fuel ratio. Noble metals are costly and not abundantly available. These draw backs of the noble metal catalysts have inspired to search for the alternative catalysts, which will perform well over the wide range of A/F ratio and are economical and abundantly available. This paper discusses the processing of ZSM-5 to Cu-Ion- Exchanged ZSM-5, ZSM-5 supported Cu-Pt bimetallic catalyst and Cu-Rh bimetallic catalyst and placing them in a three staged converter to study the reduction efficiencies of exhaust emissions CO, NOx, and HC in a 800 cc Maruti S. I. Engine. The experiments are carried out at 1500 rpm, 17.6 A/F ratio, different catalyst bed temperatures and different engine loads 0%, 17.5%, 35%, 52.5%, and 70% of full load. The results achieved are the maximum reduction of CO 90% at 375 °C NOx 90% at 375 °C and HC 61% at 380 °C. The same engine was also run for Noble metal converter (NMC) (EURO-II) purchased from an authorized Maruti distributor and the maximum reduction achieved were CO 89% at 375° C, NOx 91% at 375° C, and HC 70% at 390° C comparable to Zeolite Catalytic Converter (ZCC).

scholarly journals Promoted cobalt oxide catalyst on the metallic structured reactor filling for VOC combustion as an alternative to noble metal catalysts

2007 ◽  
Vol 9 (1) ◽  
pp. 15-19 ◽  
Author(s):  
Joanna Łojewska ◽  
Andrzej Kołodziej ◽  
Jerzy Żak
Keyword(s):  
Cobalt Oxide ◽  
Noble Metal ◽  
Oxide Catalyst ◽  
Supported Catalyst ◽  
Metal Catalysts ◽  
Catalyst Design ◽  
Cobalt Catalysts ◽  
Noble Metal Catalysts ◽  
Voc Combustion ◽  
Structured Reactor

Promoted cobalt oxide catalyst on the metallic structured reactor filling for VOC combustion as an alternative to noble metal catalysts VOC combustion is a demanding process for both the reactor and the catalyst design. As we have proved in recent papers the diffusional limitation of reaction rate that occurs during combustion may be overcome by designing the metallic microstructures used as reactor internals. Their application on an industrial scale depends on the development of an efficient method of catalyst layering on metallic supports and the optimisation of a fine catalyst structure which would not change the elaborated microstructure geometry. In this study we propose the Langmuir-Blodgett (LB) film method to deposit various metals (Al, Co) in the form of catalyst organic precursors. The film forming abilities of the precursors were checked by surface pressure measurements upon film compression, Brewster Angle Microscopy and by the monolayers stability measurements. The amount of the deposited materials was controlled by the LB parameters and verified by the TG measurements. The catalyst obtained in this way were characterized at various stages of the preparation by SEM/XFS, XPS, AFM and RM methods and tested in n-hexane combustion. Oxidation of the Al washcoat precursor led to the formation of γ-Al2O3 improving the properties of the Al2O3 layer (α phase) developed on the pre-calcined CrAl carrier. Oxidation of cobalt stearate deposited on the CrAl produced dispersed Co3O4 spinel. The cobalt catalysts were active in combustion showing resistance to sintering. Compared to standard Pt supported catalyst it demonstrated twice as low activation energy (50 kJ/mol).

scholarly journals Crucial aspects in the design of chirally modified noble metal catalysts for asymmetric hydrogenation of activated ketones

2015 ◽  
Vol 44 (21) ◽  
pp. 7449-7464 ◽  
Author(s):  
Alfons Baiker
Keyword(s):  
Noble Metal ◽  
Noble Metals ◽  
Asymmetric Hydrogenation ◽  
Metal Catalysts ◽  
Catalytic Systems ◽  
Noble Metal Catalysts ◽  
Heterogeneous Catalytic

This tutorial review analyzes the crucial aspects, which have to be considered in the development of heterogeneous catalytic systems based on chirally modified noble metals for asymmetric hydrogenation of activated ketones.

Noble Metal Catalysts for Methane Reforming in Material Application Engineering

2013 ◽  
Vol 648 ◽  
pp. 83-87 ◽  
Author(s):  
Wei Hua ◽  
Yong Chuan Dai ◽  
Hong Tao Jiang
Keyword(s):  
Noble Metal ◽  
Noble Metals ◽  
Catalytic Performance ◽  
Metal Catalysts ◽  
Coke Deposition ◽  
Methane Reforming ◽  
Ni Catalysts ◽  
Pd Catalysts ◽  
Noble Metal Catalysts ◽  
Application Engineering

Reforming of methane is an important route to produce sygas. In this paper, recent progresses of noble metals (Rh, Ru, Ir, Pt, Pd) catalysts for methane reforming in material application engineering is reviewed. The discussion mainly focuses on catalytic performance of noble metal catalysts or noble metal promoted Ni catalysts in methane reforming reaction. Effects of noble metals, supports and preparation methods on the catalytic activity, selectivity, coke deposition and stability of catalysts have been briefly summarized. In conclusion, Rh as active component, Pd as material for membrane reactor, Pt or Rh as promoters for Ni catalysts, all gave high CH4 conversion, improving catalytic performance.

scholarly journals Catalytic Reaction of Carbon Dioxide with Methane on Supported Noble Metal Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 159
Author(s):  
András Erdőhelyi
Keyword(s):  
Noble Metal ◽  
Reaction Mechanisms ◽  
Noble Metals ◽  
Carbon Deposition ◽  
Metal Catalysts ◽  
Noble Metal Catalysts ◽  
Functional Mechanism ◽  
Metal Support ◽  
Supported Noble Metals ◽  
Main Components

The conversion of CO2 and CH4, the main components of the greenhouse gases, into synthesis gas are in the focus of academic and industrial research. In this review, the activity and stability of different supported noble metal catalysts were compared in the CO2 + CH4 reaction on. It was found that the efficiency of the catalysts depends not only on the metal and on the support but on the particle size, the metal support interface, the carbon deposition and the reactivity of carbon also influences the activity and stability of the catalysts. The possibility of the activation and dissociation of CO2 and CH4 on clean and on supported noble metals were discussed separately. CO2 could dissociate on metal surfaces, this reaction could proceed via the formation of carbonate on the support, or on the metal–support interface but in the reaction the hydrogen assisted dissociation of CO2 was also suggested. The decrease in the activity of the catalysts was generally attributed to carbon deposition, which can be formed from CH4 while others suggest that the source of the surface carbon is CO2. Carbon can occur in different forms on the surface, which can be transformed into each other depending on the temperature and the time elapsed since their formation. Basically, two reaction mechanisms was proposed, according to the mono-functional mechanism the activation of both CO2 and CH4 occurs on the metal sites, but in the bi-functional mechanism the CO2 is activated on the support or on the metal–support interface and the CH4 on the metal.

Hydrogenation of Substituted Nitroaromatics on Non-Noble Metal Catalysts: Mechanistic Insights to Improve Selectivity

2019 ◽  
Author(s):  
Reisel Millán ◽  
Mercedes Boronat
Keyword(s):  
Noble Metal ◽  
Noble Metals ◽  
Metal Catalysts ◽  
Noble Metal Catalysts ◽  
Nitrobenzene Hydrogenation

he mechanism of nitrobenzene hydrogenation on non-noble metals such as Ni is different from that previously reported on noble metals like Pt. The newly proposed pathway involves the initial dissociation...

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