SEARCH Articles Figures Tables Acid zeolites Acidic zeolite keto-enol isomerization Enolate isomerization Enolic acids Enolization keto acids Enolization keto-enol Enols acidity Isomerization acids Keto enol isomerism Keto-enol isomerization Keto-enolates Keto-enols Zeolite HZSM Zeolites acidity Zeolites isomerization Zeolitic acids