کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62635 47648 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Au/TiO2 as high efficient catalyst for the selective oxidative cyclization of 1,4-butanediol to γ-butyrolactone
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Au/TiO2 as high efficient catalyst for the selective oxidative cyclization of 1,4-butanediol to γ-butyrolactone
چکیده انگلیسی

Au/TiO2 catalysts prepared by the deposition–precipitation method showed excellent activity and selectivity in the oxidative cyclization of 1,4-butanediol to γ-butyrolactone, with high yields (>99%) under mild conditions (413 K, 1.25 MPa air). Catalysts with 3–8% gold loading and calcined at 573–673 K were all highly active for the formation of γ-butyrolactone, as demonstrated by XRD, TEM, XPS, ICP and UV–vis DRS results. It is concluded that highly dispersed small (2–10 nm) gold particles are formed with the surface enrichment of gold. The ratio of cationic gold to metallic gold depends on the treatment temperature. These findings, combined with those of the activity tests, lead to the conclusion that the surface metallic nanosized gold particles are active sites. The catalyst can be reused with no drop in activity or selectivity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 252, Issue 1, 15 November 2007, Pages 69–76
نویسندگان
, , , ,