It is well known that urbanization and industrialization have resulted in the rapidly increasing emissions of volatile organic compounds (VOCs), which are a major contributor to the formation of secondary pollutants (e.g., tropospheric ozone, PAN (peroxyacetyl nitrate), and secondary organic aerosols) and photochemical smog. The emission of these pollutants has led to a large decline in air quality in numerous regions around the world, which has ultimately led to concerns regarding their impact on human health and general well-being. Catalytic oxidation is regarded as one of the most promising strategies for VOC removal from industrial waste streams. This Review systematically documents the progresses and developments made in the understanding and design of heterogeneous catalysts for VOC oxidation over the past two decades. It addresses in detail how catalytic performance is often drastically affected by the pollutant sources and reaction conditions. It also highlights the primary routes for catalyst deactivation and discusses protocols for their subsequent reactivation. Kinetic models and proposed oxidation mechanisms for representative VOCs are also provided. Typical catalytic reactors and oxidizers for industrial VOC destruction are further discussed. We believe that this Review will provide a great foundation and reference point for future design and development in this field.

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Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources.

Spinels with the formula of AB2O4 (where A and B are metal ions) and the properties of magnetism, optics, electricity, and catalysis have taken significant roles in applications of data storage, biotechnology, electronics, laser, sensor, conversion reaction, and energy storage/conversion, which largely depend on their precise structures and compositions. In this review, various spinels with controlled preparations and their applications in oxygen reduction/evolution reaction (ORR/OER) and beyond are summarized. First, the composition and structure of spinels are introduced. Then, recent advances in the preparation of spinels with solid-, solution-, and vapor-phase methods are summarized, and new methods are particularly highlighted. The physicochemical characteristics of spinels such as their compositions, structures, morphologies, defects, and substrates have been rationally regulated through various approaches. This regulation can yield spinels with improved ORR/OER catalytic activities, which can furth...

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

Catalysts for chemical and electrochemical reactions underpin many aspects of modern technology and industry, from energy storage and conversion to toxic emissions abatement to chemical and materials synthesis. This role necessitates the design of highly active, stable, yet earth-abundant heterogeneous catalysts. In this Review, we present the perovskite oxide family as a basis for developing such catalysts for (electro)chemical conversions spanning carbon, nitrogen, and oxygen chemistries. A framework for rationalizing activity trends and guiding perovskite oxide catalyst design is described, followed by illustrations of how a robust understanding of perovskite electronic structure provides fundamental insights into activity, stability, and mechanism in oxygen electrocatalysis. We conclude by outlining how these insights open experimental and computational opportunities to expand the compositional and chemical reaction space for next-generation perovskite catalysts.

http://science.sciencemag.org/content/sci/358/6364/751.full.pdf

Perovskites in catalysis and electrocatalysis

Reduction/Evolution Catalysts for Low-Temperature Electrochemical Devices Dengjie Chen,†,⊥,∇ Chi Chen,†,⊥ Zarah Medina Baiyee,† Zongping Shao,‡,§ and Francesco Ciucci*,†,∥ †Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China ‡State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing 210009, China Department of Chemical Engineering, Curtin University, Perth, Western Australia 6845, Australia Department of Chemical and Biomolecular Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

Nonstoichiometric Oxides as Low-Cost and Highly-Efficient Oxygen Reduction/Evolution Catalysts for Low-Temperature Electrochemical Devices

Perovskites as substitutes of noble metals for heterogeneous catalysis: dream or reality.

The influence of the addition of Ni on the catalytic behaviour of a Rh/Y2O3-Al2O3 catalyst (Rh/Y-Al) was evaluated in the ethanol steam reforming reaction in the presence of methyl-2-propan-1-ol as impurity. Physical-chemical properties of modified materials were determined by H2 chemisorption, XRD, BET, TPR, IR spectroscopy and TPO. It was established that the catalytic behaviour of the Rh/Y-Al base catalyst is widely improved by the addition of Ni. Nickel incorporation leads to the formation of both dispersed nickel phase and nickel aluminate species. Basic properties of the support were not modified by the addition of Ni but it was concluded to a rearrangement of acid sites. NiAl2O4 phase leads to an increase of the Lewis acid sites (LAS) of weak strength, generating a decrease of the production of coke and higher catalyst stability. It has been shown that the incorporation of Ni on the Rh/Y-Al catalyst increases the rhodium accessibility and stabilizes the rhodium particles size. Finally, the higher performances of RhNi/Y-Al catalyst were correlated to an increase in the methane steam reforming activity.

Preparation and characterization of bimetallic Rh-Ni/Y2O3-Al2O3 for hydrogen production by raw bioethanol steam reforming: influence of the addition of nickel on the catalyst performances and stability

a b s t r a c t Perovskite-type oxides of LaMnO3 were synthesized by citrate sol-gel method in the presence of an oxide support. The physicochemical properties of the LaMnO3 supported materials were characterized by inductively coupled plasma atomic emission spectroscopy (ICP-AES), thermogravimetric and differ- ential thermal analysis (TGA/DTA), N2 adsorption-desorption, X-ray diffraction (XRD), high transmission electron microscopy (HRTEM-EDX) and oxygen isotopic exchange analysis. Their catalytic performances, especially those related to the catalyst stability, were evaluated for the total oxidation of toluene. To this aim, three consecutive catalytic cycles were performed for each catalyst. The LaMnO3 perovskite phase appeared to interact with TiO2 and Y2O3-ZrO2 (YSZ) supports in a manner that affected both oxygen mobility and catalytic activity in total toluene oxidation. The isotopic exchange results matched well the catalytic tests. Indeed, the supported materials showed a remarkable oxygen exchange activity and higher catalytic performances than that of pure perovskite. For YSZ, this could be attributed to the influ- ence of oxygen vacancies and oxygen ions on the support. Regarding TiO2, this improvement could be attributed to the reducibility properties of titania (TiIV/TiIII). Strong metal-support interactions (SMSI) between the perovskite and the support were observed.

Synthesis of oxide supported LaMnO3 perovskites to enhance yields in toluene combustion

https://hal.archives-ouvertes.fr/hal-02109875/document

Fabien Can

Papers

Perovskites as substitutes of noble metals for heterogeneous catalysis: dream or reality.

Preparation and characterization of bimetallic Rh-Ni/Y2O3-Al2O3 for hydrogen production by raw bioethanol steam reforming: influence of the addition of nickel on the catalyst performances and stability

Synthesis of oxide supported LaMnO3 perovskites to enhance yields in toluene combustion

Hydrogen production from raw bioethanol steam reforming: Optimization of catalyst composition with improved stability against various impurities

An overview of the production and use of ammonia in NSR + SCR coupled system for NOx reduction from lean exhaust gas