27056
Alkane Oxidation by an Immobilized Nickel Complex Catalyst : Structural and Reactivity Differences Induced by Surface - Ligand Density on Mesoporous Silica .
 Chemical: Alkane; Chemical: Nickel; Chemical: Silica
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Alkane; Chemical: Nickel; Chemical: Silica