High surface area mesoporous nanocast LaMO3 (M = Mn, Fe) perovskites for efficient catalytic ozonation and an insight into probable catalytic mechanism

Afzal, Shahzad; Quan, Xie; Zhang, Jianlin

doi:10.1016/j.apcatb.2017.01.072

Cited by 265 publications

(85 citation statements)

References 48 publications

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“…Due to the change in chemical environment, the position of Mn peaks shifted slightly. Mn 2p 3/2 was deconvoluted into two sub‐peaks that the peak at 644.8–642.6 eV represented the Mn 4+ species and the peak at 641–642.6 eV represented Mn 3+ species . The Mn 4+ ratio increased from 41.4 to 53.8% after Mo modification.…”

Section: Resultsmentioning

confidence: 99%

“…Mn 2p 3/2 was deconvoluted into two sub-peaks that the peak at 644.8-642.6 eV represented the Mn 4+ species and the peak at 641-642.6 eV represented Mn 3+ species. 59,65,66 The Mn 4+ ratio increased from 41.4 to 53.8% after Mo modification. The decrease of Mn 3+ species might due to the decreased of oxygen vacancies.…”

Section: Characterizations and Reaction Mechanism Of The Mo Modified mentioning

confidence: 98%

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Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

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Background Selective catalytic reduction of nitrogen oxides with ammonia (NH3‐SCR) is an effective method for the nitrogen oxides (NOx) removal. This study aimed to develop a highly efficient NH3‐SCR catalyst using the naturally available Montmonrillonite (Mt) clay as the catalyst support. Results Mt was processed into PILC by Al/Zr intercalations, impregnated with MnCe mixed active components and loaded with transition metals to achieve X‐AlZr‐PILC‐MnCe (X = V, W, Co or Mo) catalysts. The optimized Mo‐AlZr‐PILC‐MnCe showed the best NH3‐SCR performance with a NO conversion rate of nearly 100% in the temperature range of 240–300 °C, and N2 selectivity of above 85% in the range of 140–300 °C. Conclusions The catalysts were characterized by SEM, BET, XRD, XPS, H2‐TPR, NH3‐TPD to define the relationships between structure, chemical properties and catalytic activity. The enhanced catalytic performance of Mo‐AlZr‐PILC‐MnCe was mainly owing to the increased acidity and better redox ability. In situ DRIFT studies indicated the deposition of Mo changed the reaction from the E‐R to the L‐H mechanism. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Characterizations and Reaction Mechanism Of The Mo Modified mentioning

confidence: 98%

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

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“…The initial pH of reaction medium is usually considered as a prime parameter in ozone-based AOPs, because it could alter both ozone self-decomposition rate and ozonation pathway. As generally recognized, basic environment facilitates the mineralization of recalcitrant chemicals as a result of indirect oxidation via OH· in ozonation processes [90][91][92][93]. Whereas, acid medium always benefits the formation of OH· in microbubbles systems [25].…”

Section: Initial Phmentioning

confidence: 97%

A Review on Ultrasonic Catalytic Microbubbles Ozonation Processes: Properties, Hydroxyl Radicals Generation Pathway and Potential in Application

Xiong

Wang

et al. 2018

Catalysts

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Ozone-based advanced oxidant processes (AOPs) have attracted remarkable attention as an alternative and effective approach for mineralization of refractory organics to innocuous substances. Key issues for ozone-based AOPs mainly focused on how to enhance ozone mass transfer and improve the production of hydroxyl radicals. Unfortunately, great efforts have been made, though, the application of ozone-based AOPs still remained in the laboratory scale due to lack of understanding of mechanisms of these hybrid processes. Besides, obtaining the balance of economical-technical feasibility is a great challenge. Ultrasonic catalytic microbubbles ozonation could be considered as a promising method, despite that there are a few studies that addressed this potential technology. Therefore, in this review, summaries about ozone-based microbubbles process, ultrasonic catalytic ozonation process, and ultrasonic catalytic microbubbles ozonation process have been provided in order to give a novel prospective about these hybrid technologies. The main influential parameters, such as initial pH, ozone dosage, intake flow rate, operating temperature, bubble size distributions, ultrasonic frequency, ultrasonic power density, and natural water constituents have also been well discussed. We truly hope that this paper will bring convenience to researchers that are devoted in the field of application of ozone-based AOPs for mineralizing refractory organics in wastewater.

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“…OH), which can accelerate the kinetics of mineralization of refractory organic pollutants in wider range of pH . Recently, micro‐ and nano‐dimensional transition and non‐transition metal oxides have been widely studied as catalysts for ozonation reaction for the degradation of various organic pollutants (as shown in Table S1) ; but many of those catalysts was evident to be effective only at low and near to neutral pH. On the contrary, pH of the dye effluent of most of the textile industries roughly varies in the range of neutral to alkaline …”

Section: Introductionmentioning

confidence: 99%

Complementary Bifunctional Unique Properties of (α,β)‐PbO Nanoparticles for Efficient Catalysis and Adsorption for Water Remediation

et al. 2019

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Lead oxides (PbO) of same chemical composition, but different crystallographic properties have been developed for complementary catalytic ozonation (designated by [PbO]a) and adsorption (designated by [PbO]b) of a model dye, reactive red–120 (RR‐120) with highest possible efficiency beyond the state‐of‐the‐art of individual processes. The highest extent of decolouration (∼99% after 4 min) with kappRR-120 1.77×10−2 s−1 and mineralization (50% after 15 min) of RR‐120 at pH 10.5 was achieved by ozonation using 0.5 g/L catalyst [PbO]a consisting major fraction of α‐PbO phase (α‐PbO: β‐PbO∼4:1) in its crystal structure. Minimum adsorption of RR‐120 (∼7%) on catalyst's surface [PbO]a led to higher accessibility of O3 to free catalyst surface sites and helped to achieve highest efficiency of catalytic ozonation. On the other hand, adsorbent [PbO]b mainly consisting of β‐PbO phase (α‐PbO: β‐PbO∼1:4) with a fractional coexistence of α‐PbO phase showed excellent adsorption of RR‐120 (571 mg/g at 320 K) at pH 7.5, but it showed inferior efficiency in catalytic ozonation. Both the materials were found to be reusable and environmentally acceptable.

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High surface area mesoporous nanocast LaMO3 (M = Mn, Fe) perovskites for efficient catalytic ozonation and an insight into probable catalytic mechanism

Cited by 265 publications

References 48 publications

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

A Review on Ultrasonic Catalytic Microbubbles Ozonation Processes: Properties, Hydroxyl Radicals Generation Pathway and Potential in Application

Complementary Bifunctional Unique Properties of (α,β)‐PbO Nanoparticles for Efficient Catalysis and Adsorption for Water Remediation

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High surface area mesoporous nanocast LaMO3 (M = Mn, Fe) perovskites for efficient catalytic ozonation and an insight into probable catalytic mechanism

Cited by 265 publications

References 48 publications

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

A Review on Ultrasonic Catalytic Microbubbles Ozonation Processes: Properties, Hydroxyl Radicals Generation Pathway and Potential in Application

Complementary Bifunctional Unique Properties of (α,β)‐PbO Nanoparticles for Efficient Catalysis and Adsorption for Water Remediation

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Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR