27057
Immobilized nickel catalysts SBA * - L - x / Ni ( L = bis ( 2 - pyridylmethyl ) ( 1H - 1 , 2 , 3 - triazol - 4 - ylmethyl ) amine ) with various ligand densities ( L content ( x ) = 0 . 5 , 1 , 2 , 4 mol % Si ) have been prepared from azidopropyl - functionalized mesoporous silicas SBA - N3 - x .
 Chemical: nickel; Chemical: Ni; Chemical: bis ( 2 - pyridylmethyl ) ( 1H - 1 , 2 , 3 - triazol - 4 - ylmethyl ) amine; Chemical: Si; Chemical: azidopropyl; Chemical: silicas
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: nickel; Chemical: Ni; Chemical: bis ( 2 - pyridylmethyl ) ( 1H - 1 , 2 , 3 - triazol - 4 - ylmethyl ) amine; Chemical: Si; Chemical: azidopropyl; Chemical: silicas