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 _    _      ___      ____      _____     ______  
| \  / ||   / _ \\   |  _ \\   |  ___||  /_   _// 
|  \/  ||  | / \ ||  | |_| ||  | ||__      | ||   
| .  . ||  | \_/ ||  | .  //   | ||__     _| ||   
|_|\/|_||   \___//   |_|\_\\   |_____||  /__//    
`-`  `-`    `---`    `-` --`   `-----`   `--`

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Text this: An active and stable CaO-CeO 2 catalyst for transesterification of oil to biodiesel