Mixed Metal Oxides of M1 MoVNbTeOx and TiO2 as Composite Catalyst for Oxidative Dehydrogenation of Ethane

Yuxin Chen,Binhang Yan,Dan Dang,Yi Cheng

doi:10.3390/catal12010071

Yuxin Chen, Binhang Yan + Show 2 more

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https://doi.org/10.3390/catal12010071

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Journal: Catalysts	Publication Date: Jan 9, 2022
Citations: 5	License type: CC BY 4.0

Affiliation: Tsinghua University, Henan University of Technology

Abstract

Composite catalysts of mixed metal oxides were prepared by mixing a phase-pure M1 MoVNbTeOx with anatase-phase TiO2. Two methods were used to prepare the composite catalysts (the simple physically mixed or sol-gel method) for the improvement of the catalytic performance in the oxidative dehydrogenation of ethane (ODHE) process. The results showed that TiO2 particles with a smaller particle size were well dispersed on the M1 surface for the sol-gel method, which presented an excellent activity for ODHE. At the same operating condition (i.e., the contact time of 7.55 gcat·h/molC2H6 and the reaction temperature of 400 °C), the M1-TiO2-SM and M1-TiO2-PM achieved the space time yields of 0.67 and 0.52 kgC2H4/kgcat/h, respectively, which were about ~76% and ~35% more than that of M1 catalyst (0.38 kgC2H4/kgcat/h), respectively. The BET, ICP, XRD, TEM, SEM, H2-TPR, C2H6-TPSR, and XPS techniques were applied to characterize the catalysts. It was noted that the introduction of TiO2 raised the V5+ abundance on the catalyst surface as well as the reactivity of active oxygen species, which made contribution to the promotion of the catalytic performance. The surface morphology and crystal structure of used catalysts of either M1-TiO2-SM or M1-TiO2-PM remained stable as each fresh catalyst after 24 h time-on-stream tests.

Highlights

Mohammad Mozahar HossainEthylene is a principal chemical commodity and an essential petrochemical building block, for example, to produce polyethylene, the most extensively used plastic in the chemical industry [1,2,3]
It can be seen that TiO2 itself had almost no catalytic activity for the selective oxidative dehydrogenation of ethane to ethylene over a wide range of temperatures and contact times for the ODHE
Catalysts of 40 wt.% TiO2 introduced to a phase-pure M1 were prepared by the solgel method and the physical mixing method and evaluated in a fixed bed reactor for the ODHE process

Summary

Introduction

Mohammad Mozahar HossainEthylene is a principal chemical commodity and an essential petrochemical building block, for example, to produce polyethylene, the most extensively used plastic in the chemical industry [1,2,3]. Among the numerous catalysts studied in the ODHE process [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24], the MoVNbTeOx catalyst possesses the merit of higher catalytic performance (e.g., ethylene selectivity and productivity) at lower temperature [5,9,10,19,24], which is synthesized by the hydrothermal [25] or slurry [26] method and composed of M1, M2, and some minor phases [27].

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