دانلود رایگان مقاله کاتالیزور پوشش دو فلزی با انتخاب بالا و واکنش برای هیدروژناسیون فورفورال

عنوان فارسی
کاتالیزور پوشش دو فلزی با انتخاب بالا و واکنش برای هیدروژناسیون فورفورال
عنوان انگلیسی
Bimetallic overlayer catalysts with high selectivity and reactivity for furfural hydrogenation
صفحات مقاله فارسی
0
صفحات مقاله انگلیسی
4
سال انتشار
2016
نشریه
الزویر - Elsevier
فرمت مقاله انگلیسی
PDF
کد محصول
E2865
رشته های مرتبط با این مقاله
شیمی
گرایش های مرتبط با این مقاله
شیمی کاتالیست، شیمی کاربردی
مجله
ارتباطات کاتالیست - Catalysis Communications
دانشگاه
دانشکده مهندسی شیمی، دانشگاه وایومینگ، ایالات متحده
کلمات کلیدی
هیدروژناسیون فورفورال، جذب سطحی، دو فلزی، پوشش پلاتین
۰.۰ (بدون امتیاز)
امتیاز دهید
چکیده

Abstract


Silica-supported platinum overlayer on nickel (Ni@Pt) or copper (Cu@Pt) catalysts were synthesized and tested for furfural hydrogenation. H2 chemisorption and an ethylene hydrogenation descriptor showed weakened H2 binding strength of both overlayer catalysts compared to pure Pt, consistent with literature predictions. Cu@Pt showed higher turnover frequencies of furfural hydrogenation compared to pure Pt and pure Cu. This improved reactivity is likely due to fewer Pt sites being blocked by strong hydrogen adsorption as a result of decreased H2 binding strength of Pt overlayer compared to pure Pt.

نتیجه گیری

4. Conclusions


Silica-supported bimetallic Ni@Pt and Cu@Pt overlayer catalysts were synthesized using the directed deposition technique. H2 chemisorption and ethylene hydrogenation reactivity indicated that H2 adsorption strength of overlaying Pt in Ni@Pt and Cu@Pt was reduced from the pure Pt, in agreement with literature predictions. Both overlayer catalysts showed higher reactivity in furfural conversion compared to their parent metals. This enhancement could be ascribed to the reduced binding strength of H2 on Pt surface, resulting in fewer Pt sites blocked by the strong H2 adsorption and increased Pt reactivity. Also, high furfuryl alcohol selectivity was obtained with the Cu@Pt overlayer catalyst as well as higher reactivity. This suggests the advantage of Pt overlayer catalysts to improve the reactivity without sacrificing the selectivity.


بدون دیدگاه