Catalytic Properties of Silver Vanadium Phosphates in n-Butane Oxidation - Considerations on the Impact of the [VxOy] Substructure

2011 ◽  
Vol 83 (10) ◽  
pp. 1697-1704 ◽  
Author(s):  
Andrey Karpov ◽  
Cornelia-Katharina Dobner ◽  
Robert Glaum ◽  
Stephan Andreas Schunk ◽  
Frank Rosowski
Keyword(s):  
Catalytic Properties ◽  
Butane Oxidation ◽  
Vanadium Phosphates ◽  
The Impact

Understanding the impact of one-dimensional pore containing 10MR and 12MR and aluminium content on MTH reaction pathways: direct synthesis of heteroatom containing UZM-55

2020 ◽  
Vol 10 (3) ◽  
pp. 726-735
Author(s):  
Melissa M. Galey ◽  
Mark A. Miller ◽  
Mary Lanuza ◽  
Sesh Prabhakar ◽  
Christopher P. Nicholas
Keyword(s):  
Pore Structure ◽  
Catalytic Properties ◽  
Direct Synthesis ◽  
Reaction Pathways ◽  
Aluminium Content ◽  
One Dimensional ◽  
The Impact

We directly synthesized one-dimensional zeolite UZM-55 as an aluminosilicate and catalyzed MTH to understand pore structure influence on catalytic properties.

scholarly journals Influence of Phosphoric Acid Modification on Catalytic Properties of γ-χ Al2O3 Catalysts for Dehydration of Ethanol to Diethyl Ether

2019 ◽  
Vol 14 (1) ◽  
pp. 1 ◽  
Author(s):  
Mutjalin Limlamthong ◽  
Nithinart Chitpong ◽  
Bunjerd Jongsomjit
Keyword(s):  
Phosphoric Acid ◽  
Surface Area ◽  
Diethyl Ether ◽  
Catalytic Properties ◽  
Surface Acidity ◽  
Catalyst Characterization ◽  
Acid Modification ◽  
Promising Alternative ◽  
The Impact ◽  
Phosphoric Acid Modification

In this present work, diethyl ether, which is currently served as promising alternative fuel for diesel engines, was produced via catalytic dehydration of ethanol over H3PO4-modified g-c Al2O3 catalysts. The impact of H3PO4 addition on catalytic performance and characteristics of catalysts was investigated. While catalytic dehydration of ethanol was performed in a fixed-bed microreactor at the temperature ranging from 200ºC to 400ºC under atmospheric pressure, catalyst characterization was conducted by inductively coupled plasma (ICP), X-ray diffraction (XRD), N2 physisorption, temperature-programmed desorption of ammonia (NH3-TPD) and thermogravimetric (TG) analysis. The results showed that although the H3PO4 addition tended to decrease surface area of catalyst resulting in the reduction of ethanol conversion, the Al2O3 containing 5 wt% of phosphorus (5P/Al2O3) was the most suitable catalyst for the catalytic dehydration of ethanol to diethyl ether since it exhibited the highest catalytic ability regarding diethyl ether yield and the quantity of coke formation as well as it had similar long-term stability to conventional Al2O3 catalyst. The NH3-TPD profiles of catalysts revealed that catalysts containing more weak acidity sites were preferred for dehydration of ethanol into diethyl ether and the adequate promotion of H3PO4 would lower the amount of medium surface acidity with increasing catalyst weak surface acidity. Nevertheless, when the excessive amount of H3PO4 was introduced, it caused the destruction of catalysts structure, which resulted in the catalyst incapability due to the decrease in active surface area and pore enlargement. Copyright © 2019 BCREC Group. All rights reservedReceived: 28th March 2018; Revised: 7th August 2018; Accepted: 15th August 2018; Available online: 25th January 2019; Published regularly: April 2019How to Cite: Limlamthong, M., Chitpong, N., Jongsomjit, B. (2019). Influence of Phosphoric Acid Modification on Catalytic Properties of g-c Al2O3 Catalysts for Dehydration of Ethanol to Diethyl Ether. Bulletin of Chemical Reaction Engineering & Catalysis, 14 (1): 1-8 (doi:10.9767/bcrec.14.1.2436.1-8)Permalink/DOI: https://doi.org/10.9767/bcrec.14.1.2436.1-8  

Exploring the impact of synthetic strategies on catalytic cracking in hierarchical beta zeolites via hydrothermal desilication and organosilane-templated synthesis

2020 ◽  
Vol 10 (14) ◽  
pp. 4602-4611 ◽  
Author(s):  
Ke Zhang ◽  
Sergio Fernandez ◽  
Elisha S. Converse ◽  
Sarah Kobaslija
Keyword(s):  
Catalytic Cracking ◽  
Catalytic Properties ◽  
Hierarchical Zeolites ◽  
Templated Synthesis ◽  
Beta Zeolites ◽  
The Creation ◽  
The Impact ◽  
Hierarchical Beta

Hierarchical zeolites can be synthesized by different strategies, resulting in the creation of mesoporosity with different configurations (inter-crystalline or intra-crystalline) in addition to unique porous and catalytic properties.

scholarly journals SOL-GEL SYNTHESIS AND CATALYTIC PROPERTIES OF VANADIUM PHOSPHATES BULK MATERIALS

2000 ◽  
Vol 11 (0) ◽  
pp. 87-93 ◽  
Author(s):  
S. A. Ennaciri ◽  
K. Malka ◽  
C. Louis ◽  
P. Barboux ◽  
C. R'kha ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Sol Gel ◽  
Bulk Materials ◽  
Vanadium Phosphates ◽  
Sol Gel Synthesis

scholarly journals Effect of Pyrolysis Temperature During Valorization of Date Stones on Physiochemical Properties of Activated Carbon and Its Catalytic Activity for the Oxidation of Cycloalkenes

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 686
Author(s):  
Hamed M. Alshammari ◽  
Nadir Abbas
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Calcination Temperature ◽  
Pyrolysis Temperature ◽  
Catalytic Properties ◽  
Kingdom Of Saudi Arabia ◽  
Physiochemical Properties ◽  
Pyrolysis Method ◽  
Different Temperatures ◽  
The Impact

This study presents findings on the chemical synthesis of activated carbon from Saudi dates and its structural, chemical, and catalytic properties. Dates are among the top biowaste materials in the Kingdom of Saudi Arabia, and efforts are underway to utilize this resource. A chemical pyrolysis method was used to synthesize activated carbon from date stones. Synthesized activated carbon was calcined at different temperatures of 400, 500, 600, and 700 °C, and the impact of calcination temperature on the properties of activated carbon was investigated. For this purpose, contemporary characterization tools, namely, XRD, Raman spectroscopy, FTIR, SEM, TEM, TGA, DSC, and XPS, were employed. Results are discussed and compared with associated studies. Finally, the catalytic activity of gold-deposited activated carbon for the oxidation of cycloalkenes was evaluated, and it was found that the calcination temperature has a linear positive relationship with the catalytic activity.

scholarly journals Solid Acid Catalysts Based on Niobium and Zirconium Oxides for Hydrolysis-Dehydration of Cellulose Into Glucose and 5-Hydroxymethylfurfural. Impact of Preparation Technique on Catalytic Properties

2020 ◽  
pp. 283-296
Author(s):  
Nikolay V. Gromov ◽  
Irina S. Yakovleva ◽  
Lubov A. Isupova ◽  
Valentin N. Parmon ◽  
Oxana P. Taran
Keyword(s):  
Catalytic Properties ◽  
Total Yield ◽  
Preparation Technique ◽  
One Pot ◽  
Solid Catalysts ◽  
Zirconium Oxides ◽  
Component Systems ◽  
Two Component Systems ◽  
The One ◽  
The Impact

The impact of the preparation techniques of niobium oxide and two-component systems based on niobium and zirconium oxides on the catalytic properties was studied in the one-pot hydrolysisdehydration of cellulose into glucose and 5-hydroxymethylfurfural. Cellulose transformation was performed in an autoclave at 180 °С under argon atmosphere. The most promising methods for the preparation of solid catalysts were found to be microwave heating and mechanical activation. Glucose and 5-hydroxymethylfurfural can be produced with total yield equal to 20-21 % in the presence of catalysts prepared using these techniques

The impact of metal doping on fumed silica structure and amino acid thermal condensation catalytic properties

2021 ◽  
Author(s):  
Haley L. Swanson ◽  
Suman Pokhrel ◽  
Stephen K. Davidowski ◽  
Lutz Mädler ◽  
C. Jeffrey Brinker ◽  
...  
Keyword(s):  
Amino Acid ◽  
Fumed Silica ◽  
Catalytic Properties ◽  
Metal Doping ◽  
Thermal Condensation ◽  
The Impact
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