scholarly journals Active sites and mechanism of the direct conversion of methane and carbon dioxide to acetic acid over the zinc-modified H-ZSM-5 zeolite

2019 ◽  
Vol 9 (22) ◽  
pp. 6297-6307 ◽  
Author(s):  
Peng Zhang ◽  
Xuejing Yang ◽  
Xiuli Hou ◽  
Jianli Mi ◽  
Zhizhong Yuan ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Acetic Acid ◽  
Catalytic Activity ◽  
Active Sites ◽  
Direct Conversion ◽  
Conversion Of Methane ◽  
Zeolite P

The catalytic activity of the conversion of CH4 and CO2 on zinc modified H-ZSM-5 is strongly dependent on the structure of the active sites.

Characterization of Modified HZSM–5 with Gallium and its Reactivity in Direct Conversion of Methane to Liquid Hydrocarbons

2012 ◽  
Author(s):  
Nor Aishah Saidina Amin ◽  
Asmadi Ali
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Zeolite Catalyst ◽  
Nitrogen Adsorption ◽  
Direct Conversion ◽  
Liquid Hydrocarbons ◽  
Exchange Method ◽  
Conversion Of Methane ◽  
Ion Exchange Method

Mangkin zeolit HZSM–5 diubahsuai secara kaedah pertukaran ion berasid bagi menghasilkan mangkin zeolit Ga–HZSM–5. Aktiviti bermangkin bagi HZSM–5 dan Ga–HZSM–5 dikaji pada suhu tindak balas 800°C dan halaju ruang jaman masa (GHSV) 7500 jam–1. Mangkin HZSM–5 dan Ga–HZSM–5 dicirikan secara XRD, NMR, Penjerapan Nitrogen dan TPD. Hasil pencirian menunjukkan aluminium keluar dari kerangka asal. HZSM–5 yang mengandungi galium adalah mangkin yang lebih baik daripada mangkin zeolit HZSM–5 bagi menghasilkan cecair hidrokarbon. Kata kunci: Ga-HZSM-5; metana; pertukaran ion berasid; cecair hidrokarbon The HZSM–5 zeolite catalyst was modified by an acidic ion exchange method to produce the Ga–HZSM–5 zeolite catalyst. The catalytic activity of HZSM–5 and Ga–HZSM–5 were studied at reaction temperature of 800°C and gas hourly space velocities (GHSV) of 7500 hr–1. HZSM–5 and Ga–HZSM–5 catalysts were characterized by XRD, NMR, Nitrogen Adsorption and TPD. The characterization results revealed that aluminium was removed from the parent framework. Gallium loaded HZSM–5 is a better catalyst than HZSM–5 zeolite catalyst to produce liquid hydrocarbons. Key words: Ga-HZSM-5; methane; acidic ion exchange; liquid hydrocarbons

scholarly journals Understanding the effect of co-reactants on ketonization of carboxylic acids in the aqueous-phase pyrolysis oil of wood

2021 ◽  
Author(s):  
Il-Ho Choi ◽  
Hye-Jin Lee ◽  
Kyung-Ran Hwang
Keyword(s):  
Acetic Acid ◽  
Catalytic Activity ◽  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Aqueous Phase ◽  
Active Sites ◽  
Mixed Solution ◽  
Pyrolysis Oil ◽  
Mixed Solutions ◽  
Reactive Compound

AbstractKetonization of carboxylic acids is one of the crucial reactions to produce sustainable bio-fuel and bio-chemicals from the pyrolysis oil of wood. Ketonization using different mixed solutions of carboxylic acids, furfural, and hydroxyacetone has been explored to understand the influence of co-feed reactants on the performance of ketonization of carboxylic acid over the selected CeZrOx catalyst. Furfural (7% in water) inhibited the catalytic activity for ketonization of acetic acid (20% solution) with reversible blocking of active sites, but for a mixed solution of hydroxyacetone (7%) and acetic acid (20%), both reactants influenced each other, resulting in very low conversions and slow and uncompleted recovery to 50% after removing hydroacetone from the mixture. For the mixed solution (20% acetic acid + 7% furfural + 7% hydroxyacetone in water), hydroxyacetone was the most reactive compound on CeZrOx and the conversions of reactants reached below 10%, due to the inhibition of co-existing carbonyl components. This work provides guidance for ketonization of carboxylic acids in the aqueous-phase pyrolysis oil.

Effects of single and double active sites of Cu oxide clusters over MFI zeolite for direct conversion of methane to methanol: DFT calculations

2021 ◽  
Author(s):  
Watinee Nunthakitgoson ◽  
Anawat Thivasasith ◽  
Thana Maihom ◽  
Chularat Wattanakit
Keyword(s):  
Dft Calculations ◽  
Active Sites ◽  
Direct Conversion ◽  
Mfi Zeolite ◽  
Zeolite Framework ◽  
Conversion Of Methane

In this context, we investigate the effect of the single and double active sites of Cu oxide clusters over the MFI zeolite framework for direct conversion of methane to methanol....

Direct Conversion of Methane with Carbon Dioxide Mediated by RhVO 3 − Cluster Anions

2019 ◽  
Vol 58 (48) ◽  
pp. 17287-17292 ◽  
Author(s):  
Yuan Yang ◽  
Bin Yang ◽  
Yan‐Xia Zhao ◽  
Li‐Xue Jiang ◽  
Zi‐Yu Li ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Direct Conversion ◽  
Cluster Anions ◽  
Conversion Of Methane

scholarly journals Active sites and mechanisms in the direct conversion of methane to methanol using Cu in zeolitic hosts: a critical examination

2020 ◽  
Vol 49 (5) ◽  
pp. 1449-1486 ◽  
Author(s):  
Mark A. Newton ◽  
Amy J. Knorpp ◽  
Vitaly L. Sushkevich ◽  
Dennis Palagin ◽  
Jeroen A. van Bokhoven
Keyword(s):  
Critical Review ◽  
Active Sites ◽  
Direct Conversion ◽  
Critical Examination ◽  
Selective Conversion ◽  
Current State ◽  
Conversion Of Methane

In this critical review we examine the current state of our knowledge in respect of the nature of the active sites in copper containing zeolites for the selective conversion of methane to methanol.

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