Molecular simulation studies of adsorption of hydrogen cyanide and methyl ethyl ketone on zeolite NaX and activated carbon

Kotdawala, R. R.; Kazantzis, Nikolaos; Thompson, Robert W.

doi:10.1016/j.jhazmat.2008.01.045

Cited by 21 publications

(12 citation statements)

References 12 publications

(20 reference statements)

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“…Since molecules with dipolar moments are still more strongly adsorbed, even lower activities of those would be necessary. In addition, HCN will outcompete H 2 O on the zeolite surfaces due to higher dipole moment [33]. …”

Section: Introductionmentioning

confidence: 99%

Reduction of nitrogen compounds in oceanic basement and its implications for HCN formation and abiotic organic synthesis

Holm

Neubeck

2009

Geochem Trans

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Hydrogen cyanide is an excellent organic reagent and is central to most of the reaction pathways leading to abiotic formation of simple organic compounds containing nitrogen, such as amino acids, purines and pyrimidines. Reduced carbon and nitrogen precursor compounds for the synthesis of HCN may be formed under off-axis hydrothermal conditions in oceanic lithosphere in the presence of native Fe and Ni and are adsorbed on authigenic layer silicates and zeolites. The native metals as well as the molecular hydrogen reducing CO2 to CO/CH4 and NO3-/NO2- to NH3/NH4+ are a result of serpentinization of mafic rocks. Oceanic plates are conveyor belts of reduced carbon and nitrogen compounds from the off-axis hydrothermal environments to the subduction zones, where compaction, dehydration, desiccation and diagenetic reactions affect the organic precursors. CO/CH4 and NH3/NH4+ in fluids distilled out of layer silicates and zeolites in the subducting plate at an early stage of subduction will react upon heating and form HCN, which is then available for further organic reactions to, for instance, carbohydrates, nucleosides or even nucleotides, under alkaline conditions in hydrated mantle rocks of the overriding plate. Convergent margins in the initial phase of subduction must, therefore, be considered the most potent sites for prebiotic reactions on Earth. This means that origin of life processes are, perhaps, only possible on planets where some kind of plate tectonics occur.

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Section: Introductionmentioning

confidence: 99%

Reduction of nitrogen compounds in oceanic basement and its implications for HCN formation and abiotic organic synthesis

Holm

Neubeck

2009

Geochem Trans

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“…The use of impregnated carbons with transition metals such as Cu, Zn, Ag, Co, Mo, and Cr is reported [93,94]. HCN adsorption in NaX zeolites has also been studied [95], and on mesoporous silica impregnated with metallic ions [96].…”

Section: Hcn Removalmentioning

confidence: 99%

Synthesis Gas Purification

Chiche

Diverchy

Lucquin

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Purification des gaz de synthe`se -Les proce´de´s de synthe`se de biocarburants par voie Fischer-Tropsch (FT), voies B-XTL, repre´sentent des alternatives prometteuses pour la production d'e´nergie. Ces proce´de´s permettent la conversion en carburants de synthe`se de biomasse lignocellulosique, e´ventuellement mise en oeuvre en me´lange avec des charges fossiles telles que petcoke, charbons ou re´sidus sous vide. Pour ce faire, une e´tape de gaze´ification convertit la charge carbone´e en un gaz de synthe`se (me´lange de CO et H 2 ), lequel, apre`s ajustement du ratio H 2 /CO et e´limination du CO 2 , subit ensuite la re´action de FischerTropsch. Les gaz de synthe`se contiennent cependant de nombreuses impurete´s qui ne´cessitent d'eˆtre e´limine´es afin d'e´viter l'empoisonnement des catalyseurs Fischer-Tropsch. En raison de la grande varie´te´de charges pouvant eˆtre mises en oeuvre, la composition des gaz de synthe`se est susceptible de subir d'importantes variations, en particulier de part la nature des impurete´s (e´le´ments, spe´ciation) pre´sentes ainsi que leurs teneurs relatives. La composition des gaz de synthe`se est e´galement soumise a`des spe´cifications extreˆmement se´ve`res en terme de purete´lie´es a`l'importante sensibilite´aux poisons des catalyseurs FT. Pour ces raisons, la purification des gaz de synthe`se constitue un de´fi majeur pour le de´veloppement des proce´de´s B-XTL. Dans cet article, nous pre´sentons les principaux enjeux lie´s a`la purification des gaz de synthe`se. Les diffe´rents types d'impurete´s pouvant eˆtre pre´sentes dans les gaz de synthe`se sont pre´sente´es. L'influence de la nature de la charge, des technologies de gaze´ification ainsi que des conditions ope´ratoires associe´es sur la nature des impurete´s et leurs teneurs relatives est discute´e. Une attention particulie`re est porte´e au devenir des compose´s soufre´s, azote´s, des haloge`nes, me´taux lourds et me´taux de transition. Les principales technologies de purification des gaz de synthe`se (adsorption, absorption, re´actions catalytiques, etc.) sont finalement de´crites, ainsi que les de´fis associe´s.Abstract -Synthesis Gas Purification -Fischer-Tropsch (FT) based B-XTL processes are attractive alternatives for future energy production. These processes aim at converting lignocellulosic biomass possibly in co-processing with petcoke, coal, or vacuum residues into synthetic biofuels. A gasification step converts the feed into a synthesis gas (CO and H 2 mixture), which undergoes the Fischer-Tropsch reaction after H 2 /CO ratio adjustment and CO 2 removal. However synthesis gas also contains various impurities that must be removed in order to prevent Fischer-Tropsch catalyst poisoning. Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 68 (2013), No. 4, pp. 707-723 Copyright Ó 2013, IFP Energies nouvelles DOI: 10.2516 Due to the large feedstocks variety that can be processed, significant variations of the composition of the synthesis gas are expected. Especially, this affects the ...

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“…Furthermore, the impregnated organic compounds had more efficiency than inorganic compounds. While R. R. Kotdawala et al [32] exposed that the polar compounds, containing carboxyl, hydroxyl or carbonyl groups, had high efficiency for adsorbing hydrogen cyanide, depending on their induced dipole and charge-dipole interactions. Peter Branton et al [33] reported that the efficiency of the adsorption of hydrogen cyanide depended on physisorption or chemisorption.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of HCN from Pyrolysis of Tobacco Leaves with Na2CO3, NaHCO3, and Proline

Sanbundit¹,

Chatsiriwech²

2019

ACES

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Hydrogen cyanide (HCN) was produced by flameless combustion of dried tobacco leaves for investigating the adsorption on Na 2 CO 3 , NaHCO 3 and proline (HNC 4 H 7 COOH). The concentration of HCN could be produced steadily at 0.73 mg/dm 3. For the given 245 cm 3 of smoke with the flow rate of 17.5 cm 3 /s, the efficiency of adsorption of HCN was improved to 80% by the addition of the optimal amounts of Na 2 CO 3 , NaHCO 3 and proline (HNC 4 H 7 COOH), which were 10, 20, and 30 mg respectively. In the circumstances, the breakthrough concentration was reduced to 0.15-0.20 mg/dm 3 .

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Molecular simulation studies of adsorption of hydrogen cyanide and methyl ethyl ketone on zeolite NaX and activated carbon

Cited by 21 publications

References 12 publications

Reduction of nitrogen compounds in oceanic basement and its implications for HCN formation and abiotic organic synthesis

Reduction of nitrogen compounds in oceanic basement and its implications for HCN formation and abiotic organic synthesis

Synthesis Gas Purification

Adsorption of HCN from Pyrolysis of Tobacco Leaves with Na<i>2</i>CO<i>3</i>, NaHCO<i>3</i>, and Proline

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Molecular simulation studies of adsorption of hydrogen cyanide and methyl ethyl ketone on zeolite NaX and activated carbon

Cited by 21 publications

References 12 publications

Reduction of nitrogen compounds in oceanic basement and its implications for HCN formation and abiotic organic synthesis

Reduction of nitrogen compounds in oceanic basement and its implications for HCN formation and abiotic organic synthesis

Synthesis Gas Purification

Adsorption of HCN from Pyrolysis of Tobacco Leaves with Na&lt;i&gt;2&lt;/i&gt;CO&lt;i&gt;3&lt;/i&gt;, NaHCO&lt;i&gt;3&lt;/i&gt;, and Proline

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Adsorption of HCN from Pyrolysis of Tobacco Leaves with Na<i>2</i>CO<i>3</i>, NaHCO<i>3</i>, and Proline