scholarly journals The Application of Calcium Oxide and Magnesium Oxide from Natural Dolomitic Rock for Biodiesel Synthesis

2015 ◽  
Vol 79 ◽  
pp. 562-566 ◽  
Author(s):  
Achanai Buasri ◽  
Kanokphol Rochanakit ◽  
Wasupon Wongvitvichot ◽  
Uraiporn Masa-ard ◽  
Vorrada Loryuenyong
Keyword(s):  
Magnesium Oxide ◽  
Calcium Oxide ◽  
Dolomitic Rock ◽  
Biodiesel Synthesis

Effectiveness of Steam Treating Method on Inhibiting the Expansive Problem of Concrete with Slag as Aggregate

2013 ◽  
Vol 723 ◽  
pp. 609-616
Author(s):  
Wei Chien Wang ◽  
Chih Chien Liu ◽  
Chau Lee
Keyword(s):  
Magnesium Oxide ◽  
Calcium Oxide ◽  
Steel Industry ◽  
Volume Expansion ◽  
Steam Treatment ◽  
Free Calcium ◽  
Concrete Aggregate ◽  
Furnace Slag ◽  
By Products

The furnace slag are the by-products of the steel industry, the main ingredients are the oxide of calcium, alumina and magnesium, and some silica. Slag used as concrete aggregate could cause the problem of the volume expansion of concrete. The expansion problem may be produced by ASR or free calcium oxide and magnesium oxide in slag. This research stabilizing the non-ASR reactive slag using steam treatment analyzes the effectiveness of steam treating technique inhibiting the expansive problem for slag used in concrete. And this paper also discusses the effect of the steam treating time on the performance of inhibiting the expansive problem.

scholarly journals Evaluation of Shell-Derived Calcium Oxide Catalysts for the Production of Biodiesel Esters from Cooking Oils

2021 ◽  
pp. 20-27
Author(s):  
Ngee Sing Chong ◽  
Francis Uchenna Okejiri ◽  
Saidi Abdulramoni ◽  
Shruthi Perna ◽  
Beng Guat Ooi
Keyword(s):  
Calcium Oxide ◽  
Waste Cooking Oil ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
X Ray ◽  
Cooking Oil ◽  
Biodiesel Synthesis ◽  
Cooking Oils ◽  
The Cost ◽  
Percentage Conversion

Due to the high cost of feedstock and catalyst in biodiesel production, the viability of the biodiesel industry has been dependent on government subsidies or tax incentives. In order to reduce the cost of production, food wastes including eggshells and oyster shells have been used to prepare calcium oxide (CaO) catalysts for the transesterification reaction of biodiesel synthesis. The shells were calcined at 1000 °C for 4 hours to obtain CaO powders which were investigated as catalysts for the transesterification of waste cooking oil. The catalysts were characterized by Fourier Transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), and X-ray fluorescence (XRF) spectroscopy. Reaction parameters such as methanol-to-oil molar ratio, CaO catalyst concentration, and reaction time were evaluated and optimized for the percentage conversion of cooking oil to biodiesel esters. The oyster-based CaO showed better catalytic activity when compared to the eggshell-based CaO under the same set of reaction conditions.

The application of calcined natural dolomitic rock as a solid base catalyst in triglyceride transesterification for biodiesel synthesis

2008 ◽  
Vol 10 (6) ◽  
pp. 654 ◽  
Author(s):  
Karen Wilson ◽  
Chris Hardacre ◽  
Adam F. Lee ◽  
Janine M. Montero ◽  
Lee Shellard
Keyword(s):  
Solid Base ◽  
Base Catalyst ◽  
Solid Base Catalyst ◽  
Dolomitic Rock ◽  
Biodiesel Synthesis

Mesoporous calcium oxide–silica and magnesium oxide–silica composites for CO2 capture at ambient and elevated temperatures

2016 ◽  
Vol 4 (28) ◽  
pp. 10914-10924 ◽  
Author(s):  
Chamila Gunathilake ◽  
Mietek Jaroniec
Keyword(s):  
Greenhouse Gases ◽  
Porous Materials ◽  
Magnesium Oxide ◽  
Calcium Oxide ◽  
Co2 Capture ◽  
Elevated Temperatures ◽  
Metal Species ◽  
Basic Metal

Incorporation of basic metal species (oxides) such as magnesium oxide and calcium oxide into porous materials is a logical strategy for enlarging the uptake of acidic greenhouse gases such as CO2.

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