Tuning the acidity by addition of transition metal to Mn modified hollow silica spheres and their catalytic activity in ethanol dehydration to ethylene

被引：4

作者：

Florea, Mihaela ^{[1
]}

Bocirnea, Amelia ^{[1
]}

Neatu, Stefan ^{[1
]}

Kuncser, Andrei M. ^{[1
]}

Trandafir, Mihaela-Mirela ^{[1
]}

Neatu, Florentina ^{[1
]}

机构：

[1] Natl Inst Mat Phys, Atomistilor 405A, Magurele 077125, Romania

来源：

APPLIED CATALYSIS A-GENERAL | 2022年 / 646卷

关键词：

Ethanol dehydration to ethylene; Hollow spheres; Mn; Transition metal; Silica-zirconia; Acidity; DIMETHYL ETHER; DIETHYL-ETHER; DEHYDROGENATION; METHANOL; SHELL; MICROSPHERES; MECHANISM; SUPPORT; DESIGN; SIZE;

D O I：

10.1016/j.apcata.2022.118860

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Due to the currently worldwide petrochemical feedstock shortage, the ethylene synthesis from renewable non-oil sources becomes of high interest. The catalysts were prepared in two steps: (i) formation of spheres containing the carbon-coated Mn core by hydrothermal method, (ii) formation of the Si-Zr oxide shell by sol-gel method. The prepared catalysts were characterized by N2 physisorption, SEM-EDX, XRD, XPS, and NH3-TPD. The catalytic results have shown that Fe, Zn or Ni modified Mn core exhibited superior activity compared to the catalysts containing only Mn in the core. With 75% yield and 98% ethanol conversion at 350 degrees C and WHSV of 1.4 h-1, MnNi@SiZr was the best catalyst. These results are due to an increased number of acid sites compared to the other materials and an optimal ratio of weak/medium acid sites. Our findings suggest new lines for developing active and stable catalysts for ethylene synthesis from ethanol.

引用

页数：11