Effects of La2O3, CeO2 and LaPO4 introduction on vanadium tolerance of USY zeolites

Du, Xiaosheng; Zhang, Haitao; Cao, Gaoshao; Wang, Lin; Zhang, Chenxi; Gao, Xionghou

doi:10.1016/j.micromeso.2014.12.010

Cited by 15 publications

(5 citation statements)

References 39 publications

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“…The thermal stability was more marked with La 3+ as compared to Ce 3+ . In addition, Du, X., et al [27] examined three rare-earth oxides namely (La2O3, CeO2, and LaPO4) for the properties improvement of the USY zeolite catalyst as vanadium traps. In fact, it found that rare-earth oxides is thoroughly distributed on the zeolites surfaces, and some of rare-earth ions moved to cages of the zeolites under calcination and hydrothermal process.…”

Section: New Insights On the Use Of Rare Earth Elements On Advanced M...mentioning

confidence: 99%

Intelligent Materials such as Rare Earth Elements on High-tech Materials Engineering for Catalysis and Environmental Applications

DIALLO

2023

Preprint

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Materials engineering and catalysis are known as central sciences, which can deeply contribute to the technological development of our nations, and as well as ensure the environmental protection and cleaning from both organic and inorganic contaminants. So, the generation of the most wanted chemical and fuels such as (CH4) or to carbon monoxide (CO/H2), methanol (CH3OH) or even to hydrogen (H2) and ammonia (NH3) requires strongly active, selective, stable, and as well as reusable materials (catalysis) to fulfill the mankind needs. The determination and removing both inorganic and organic are highly regarded special issue in healthcare. So that, all these areas strong materials for the complete transformation of these chemical products. Indeed, zeolite materials are very explored in the recent years as they present advanced properties in both catalysis and environmental concerns. Also, its combination with transition noble and non-noble metals are also considered in order to boost the catalytic yields. In fact, here, it is ascribed the role of transition rare-earth (RE) elements in the hybrid materials engineering for advanced technological applications. It demonstrated that rare earth oxides might enhance catalytic features and avoid the loss of acid sites under the fluid catalytic craking (FCC) unit operation. Moreover, It is shown that (RE) elements might be used for materials engineering for high-tech uses such as in hydrogen evolution reaction (HER), methanol oxidation reaction (MOR), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). Many other reactions can be realized over hybrid materials made via the use of rare earth (RE) elements with improved catalytic performances. Therefore, due to the large properties of transition rare-earth (RE) metals, more possible superb materials will be engineered in upcoming generation.

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Section: New Insights On the Use Of Rare Earth Elements On Advanced M...mentioning

confidence: 99%

Intelligent Materials such as Rare Earth Elements on High-tech Materials Engineering for Catalysis and Environmental Applications

DIALLO

2023

Preprint

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“…In general, lanthanum is preferentially found in the cages and supercages of zeolite made via ion exchange [71] as opposed to the surface of the precipitation-derived zeolite. Due to V combining with La in La-Y zeolites to create lanthanum vanadate, RE-zeolite becomes unstable due to the loss of La-Oxygen bonding stabilizing in the zeolite channels [72].…”

Section: P R E -P R O O Fmentioning

confidence: 99%

“…The zeolite's thermal and hydrothermal stabilities are strengthened when RE ions are positioned in the small cages, but its V tolerance decreases [72]. For example, Feron investigated the impact of and lanthanum octoate and samarium naphthenate on V deactivation found that by co-impregnated C 44 H 28 O 8 V and soluble RE-elements, more than 90% of the crystalline structure could be retained [69].…”

Section: P R E -P R O O Fmentioning

confidence: 99%

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Development of heavy metal passivators in residue fluid catalytic cracking process

Salahshour

Yavari

Güleç

et al. 2022

jcc

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“…These are often an active component, for example, zeolites, a filler such as kaolin, different porogens, a binder, and few different promotors and additives. In the case of cracking catalysts, there are three general options for production: The first is the combination of all separate components in one particle via spray drying, which provides a straight-forward synthesis route after optimization but lacks flexible catalyst adjustment to varying feed qualities − (Figure a). The second is the use of different individual grains for the fine-tuning of additive addition, depending on a flexible change in the hydrocarbon feed composition, which hides the challenge of adjusting the thermal and rheological properties of all particles individually and in combination ,, (Figure b).…”

Section: Introductionmentioning

confidence: 99%

Crucial Role of Silica-Alumina Binder Mixtures for Hydrocarbon Cracking with ZSM-5 Additives

et al. 2022

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Alumina-containing binders are widely used for the binding of catalyst particles by spray drying and calcination. As a part of the active matrix, they contribute to the catalytic performance of the resulting catalyst grain during hydrocarbon cracking. In this study, correlations are investigated using different compositions of Al- and Si-based binders (AlCl3 and colloidal silica) together with kaolin as a filler and ZSM-5 zeolite as an active compound. It was demonstrated that the conversion of a 50:50 hexane mixture, the selectivity toward unsaturated hydrocarbons, and the shape-selective conversion of the hexane feed are highly dependent on the amount and distribution of alumina in binder formulations. While silica species are distributed near the outer shell of catalyst grains, the alumina species are distributed evenly as an adhesive between the catalyst compounds ZSM-5 and kaolin. An optimum amount of alumina in binder formulations results in an increasing conversion of hydrocarbon feedstock due to optimum in active-site accessibility but only a slight decrease in shape-selective properties compared to pure ZSM-5, resulting in an optimum yield of light olefins, especially propylene.

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Effects of La2O3, CeO2 and LaPO4 introduction on vanadium tolerance of USY zeolites

Cited by 15 publications

References 39 publications

Intelligent Materials such as Rare Earth Elements on High-tech Materials Engineering for Catalysis and Environmental Applications

Intelligent Materials such as Rare Earth Elements on High-tech Materials Engineering for Catalysis and Environmental Applications

Development of heavy metal passivators in residue fluid catalytic cracking process

Crucial Role of Silica-Alumina Binder Mixtures for Hydrocarbon Cracking with ZSM-5 Additives

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