Enhanced Catalytic Activity for Biodiesel Synthesis using an Acid‐Tolerant Calcium/Magnesium/Aluminum‐Oxide Hybrid with Improved Hydrophobicity and Dispersibility

2015 ◽  
Vol 3 (3) ◽  
pp. 211-215
Author(s):  
Mingming Fan ◽  
Qiuju Han ◽  
Pingbo Zhang ◽  
Pingping Jiang
Keyword(s):  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Biodiesel Synthesis ◽  
Acid Tolerant ◽  
Calcium Magnesium ◽  
Magnesium Aluminum Oxide

scholarly journals Bio-Derived Catalysts: A Current Trend of Catalysts Used in Biodiesel Production

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 812
Author(s):  
Hoang Chinh Nguyen ◽  
My-Linh Nguyen ◽  
Chia-Hung Su ◽  
Hwai Chyuan Ong ◽  
Horng-Yi Juan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Fossil Fuels ◽  
Current Trend ◽  
Biodiesel Production ◽  
High Catalytic Activity ◽  
Promising Alternative ◽  
Advantages And Disadvantages ◽  
Biodiesel Synthesis ◽  
Alkali Catalysts ◽  
A Current

Biodiesel is a promising alternative to fossil fuels and mainly produced from oils/fat through the (trans)esterification process. To enhance the reaction efficiency and simplify the production process, various catalysts have been introduced for biodiesel synthesis. Recently, the use of bio-derived catalysts has attracted more interest due to their high catalytic activity and ecofriendly properties. These catalysts include alkali catalysts, acid catalysts, and enzymes (biocatalysts), which are (bio)synthesized from various natural sources. This review summarizes the latest findings on these bio-derived catalysts, as well as their source and catalytic activity. The advantages and disadvantages of these catalysts are also discussed. These bio-based catalysts show a promising future and can be further used as a renewable catalyst for sustainable biodiesel production.

scholarly journals Synthesis, Characterization of Chitosan-Aluminum Oxide Nanocomposite for Green Synthesis of Annulated Imidazopyrazol Thione Derivatives

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1160
Author(s):  
Abir S. Abdel-Naby ◽  
Sara Nabil ◽  
Sarah Aldulaijan ◽  
Ibtisam M. Ababutain ◽  
Azzah I. Alghamdi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Reaction Medium ◽  
Thiol Group ◽  
Docking Studies ◽  
Significant Loss ◽  
Gram Negative Bacteria ◽  
Organic Catalyst ◽  
Group 1

Chitosan-aluminum oxide nanocomposite was synthesized, characterized, and used as a green heterogeneous catalyst to synthesize novel imidazopyrazolylthione derivatives. Nanocomposite polymeric material was characterized by EDS-SEM and XRD. The powerful catalytic activity, and its base character of the nanocomposite, was used to synthesize imidazopyrazolylthione (1) in a good yield compared to traditional cyclocondensation synthesis. Using the nanocomposite catalyst, substitution of the thiol group (1) afforded the corresponding thiourea (2) and the corresponding ester (3). The efficiency of the nanocomposite over the traditional base organic catalyst, Et3N and NaOH, makes it an effective, economic, and reproducible nontoxic catalyst. Moreover, the heterogeneous nanocomposite polymeric film was easily isolated from the reaction medium, and recycled up to four times, without a significant loss of its catalytic activity. The newly synthesized derivatives were screened as antibacterial agents and showed high potency. Molecular docking was also performed for a more in-depth investigation. The results of the docking studies have demonstrated that the docked compounds have strong interaction energies with both Gram-positive and Gram-negative bacteria.

The removal of chloride from solutions with various cations using magnesium–aluminum oxide

2005 ◽  
Vol 42 (1) ◽  
pp. 25-29 ◽  
Author(s):  
Tomohito Kameda ◽  
Toshiaki Yoshioka ◽  
Tatsunosuke Hoshi ◽  
Miho Uchida ◽  
Akitsugu Okuwaki
Keyword(s):  
Aluminum Oxide ◽  
Magnesium Aluminum Oxide

scholarly journals MODIFIED COBALT CATALYSTS FOR HYDROGENATION OF HYDROCARBONS

2020 ◽  
Vol 18 (3) ◽  
pp. 156-161
Author(s):  
A.N. Aitugan ◽  
S.K. Tanirbergenova ◽  
Ye. Tileuberdi ◽  
D. Tugelbayeva
Keyword(s):  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Process Parameters ◽  
Cobalt Catalyst ◽  
Cobalt Catalysts ◽  
Oxide Content ◽  
Acetylene Hydrogenation ◽  
Aluminum Oxides ◽  
Selective Hydrogenation Of Acetylene ◽  
Chemical Contents

This work is devoted to the study of the influence of aluminum oxide content on the activity of cobalt catalysts in the reaction of selective hydrogenation of acetylene to ethylene. Cobalt catalysts modified with aluminum oxide having size between 50 to 500 nm were synthesized. Chemical contents and structure of carrier were investigated.  The catalytic activity of 5 % Со /clay and 5% Co/SiAl catalysts at acetylene hydrogenation was studied in the temperature range 100-180 , with a ratio of 1:2 of acetylene and hydrogen. The ethylene yield is 87.8 % in modifying the cobalt catalyst with aluminum oxide, whereas with the same process parameters, the ethylene yield is 72 %. 5 % Cobalt catalysts modified with 1.5 % aluminum oxides are more active in hydrogenation acetylene process than 5 % Со /clay 450 ℃ catalyst.

New Treatment Methods for Waste Water Containing Chloride Ion Using Magnesium–Aluminum Oxide

2000 ◽  
Vol 29 (10) ◽  
pp. 1136-1137 ◽  
Author(s):  
Tomohito Kameda ◽  
Yoshinori Miyano ◽  
Toshiaki Yoshioka ◽  
Miho Uchida ◽  
Akitsugu Okuwaki
Keyword(s):  
Waste Water ◽  
Aluminum Oxide ◽  
Chloride Ion ◽  
Treatment Methods ◽  
New Treatment ◽  
Magnesium Aluminum Oxide

Tribocatalytic Enhancement of Methane Oxidation

2005 ◽  
Author(s):  
Tomotaka Abe ◽  
Ken’ichi Hiratsuka ◽  
Czesław Kajdas
Keyword(s):  
Organic Chemistry ◽  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Electron Emission ◽  
Oxidation Reaction ◽  
Negative Ion ◽  
Silver Catalyst ◽  
Oxidation Reactions ◽  
Action Mechanism

Oxidation reaction of methane is one of the most fundamental reactions in organic chemistry. This reaction is enhanced by silver catalyst [1]. In this study, we confirmed that the catalytic activity of silver is enhanced more by the friction. This effect is called tribocatalysis. In previous studies about tribocatalysis, we have shown that the oxidation reactions of hydrogen [2], carbon monoxide [3] and ethylene were promoted by the friction. According to NIRAM (negative-ion-radical action mechanism) approach, exo-electron emission triggers the promotion of chemical reactions [4]. Insulator such as aluminum oxide, when it is worn, emits larger number of negative particles including electrons compared with metals [5]. Therefore we expected that the friction of aluminum oxide promotes tribochemical reactions more than metals.

The Surface Area and Catalytic Activity of Aluminum Oxide

1949 ◽  
Vol 71 (11) ◽  
pp. 3637-3641 ◽  
Author(s):  
Wallace S. Brey ◽  
K. A. Krieger
Keyword(s):  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Surface Area

Local structures and TWC activity of Pd supported on Ni-substituted aluminium oxide borates

2016 ◽  
Vol 6 (14) ◽  
pp. 5464-5472 ◽  
Author(s):  
Yuki Nagao ◽  
Takafumi Hamada ◽  
Ayaka Imamura ◽  
Satoshi Hinokuma ◽  
Yunosuke Nakahara ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Aluminium Oxide ◽  
Pd Catalyst ◽  
No Adsorption ◽  
Local Structures ◽  
Three Way Catalysis

The Pd catalyst supported on Ni-substituted aluminum oxide borate (Ni–10A2B) achieved the highest catalytic activity under three-way catalysis conditions, where NO adsorption onto the Ni site promoted the reaction with hydrogen spilt over from Pd under rich conditions.

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