Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

Abstract

In this work, we studied the role of zinc in the composition of supported iron-containing catalysts for the hydrogenation of CO2. Various variants of incipient wetness impregnation of the support were tested to obtain catalyst samples. The best results are shown for samples synthesized by co-impregnation of the support with a common solution of iron and zinc precursors at the same molar ratio of iron and zinc. Catalyst samples were analyzed by various methods: Raman, DRIFT-CO, TPR-H2, XPS, and UV/Vis. The introduction of zinc leads to the formation of a mixed ZnFe2O4 phase. In this case, the activation of the catalyst proceeds through the stage of formation of the metastable wustite phase FeO. The formation of this wustite phase promotes the formation of metallic iron in the composition of the catalyst under the reaction conditions. It is believed that the presence of metallic iron is a necessary step in the formation of iron carbides—that is, active centers for the formation and growth of chain in the hydrocarbons. This leads to an increase in the activity and selectivity of the formation of hydrocarbons in the process of CO2 hydrogenation.

A Synergistic Effect of Potassium and Transition Metal Compounds on the Catalytic Behaviour of Hydrolysis Lignin in CO2-Assisted Gasification

“…Otherwise, the problems of climate change (global warming) and other environmental pollution will be enhanced. CO 2 -assisted gasification of lignin, for example, provides an additional source of valuable carbon monoxide used in the large-scale syntheses of methanol, dimethyl ether, etc., and simultaneously utilises CO 2 by converting it into carbon monoxide, methane or more complex products [2,3]. This application can be ecologically valuable.…”

High-Rate-Capacity Cathode Based on Zn-Doped and Carbonized Polyacrylonitrile-Coated Na4MnV(PO4)3 for Sodium-Ion Batteries

“…Meanwhile, the Zn 2p spectrum (Figure d) exhibits two conspicuous peaks at 1022.2 and 1045.2 eV, corresponding to Zn 2p 3/2 and Zn 2p 1/2 , respectively. The result shows that Zn is bivalent. − The C 1s spectrum (Figure e) exhibits three peaks corresponding to the C–C bond (284.8 eV), C–O bond (286.4 eV), and O–CO bond (288.6 eV). ,, The N 1s XPS spectrum (Figure f) shows the peaks for three different states of N, including pyridinic nitrogen (398.6 eV), pyrrolic nitrogen (400.8 eV), and graphitic nitrogen (402.4 eV) . The presence of N is mostly attributed to PAN. , The disorder states of nitrogen provide more defects and vacancies for the carbonized PAN layer.…”

Layered Ferrihydrite and BN Nanoparticle Heterostructures Doped with Ag for CO2 Hydrogenation

“…This means that modification with Ag leads to some stabilization of the bimetallic system. Just as Zn affects iron’s reduction and its electronic state and CO 2 hydrogenation, Ag in small quantities appears to behave in a similar way, helping to alter iron’s reducibility . TPR-H 2 summary data are collected in Table S4.…”