Study on the Hydrotreating Catalysts Containing Phosphorus of Coal Tar to Clean Fuels

Zhang, Hong Hua; Cao, Yi; Usman, Muhammad; Li, Li Jun; Li, Chun Shan

doi:10.4028/www.scientific.net/amr.531.263

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…The density of acid sites was measured by temperature-programmed desorption of ammonia (NH3-TPD). The desorption peaks below 200, 200-400, and 400-600 °C were considered as weakly, moderately, and strongly acidic, respectively [26][27][28][29]. As shown in Figure 2B, the ammonia desorption peaks of all three SAPO-34 zeolites confirmed the presence of both weakly and strongly acidic sites but the relative ratio of total acidic sites varies the increases in direct correlation according to the Si/Al ratio.…”

Section: Resultsmentioning

confidence: 90%

Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures

et al. 2019

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Propene is an important synthetic industrial product predominantly formed by a methanol-to-olefins (MTO) catalytic process. Propene is known to form oligomers on zeolite catalysts, and paramters to separate it from mixtures and its diffusion properties are difficult to measure. Herein, we explored the adsorption–chemisorption behavior of propene by choosing SAPO-34 zeolites with three different degrees of acidity at various adsorption temperatures in an ultra-high-vacuum adsorption system. H-SAPO-34 zeolites were prepared by a hydrothermal method, and their structural, morphological, and acidic properties were investigated by XRD, SEM, EDX, and temperature-programmed desorption of ammonia (NH3-TPD) analysis techniques. The XRD analysis revealed the highly crystalline structure which posses cubic morphology as confirmed by SEM images. The analysis of adsorption of propene on SAPO-34 revealed that a chemical reaction (chemisorption) was observed between zeolite and propene at room temperature (RT) when the concentration of acidic sites was high (0.158 mmol/g). The reaction was negligible when the concentration of the acidic sites was low (0.1 mmol/g) at RT. However, the propene showed no reactivity with the highly acidic SAPO-34 at low temperatures, i.e., −56 °C (using octane + dry ice), −20 °C (using NaCl + ice), and 0 °C (using ice + water). In general, low-temperature conditions were found to be helpful in inhibiting the chemisorption of propene on the highly acidic H-SAPO-34 catalysts, which can facilitate propene separation and allow for reliable monitoring of kinetic parameters.

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Section: Resultsmentioning

confidence: 90%

Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures

et al. 2019

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“…Zeolites have a unique chemical composition, distinctive pore size distribution, and chemical, thermal, and ion exchange properties [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. These materials have been employed for a range of applications, including capture, purification, and catalysis [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. Among zeolites, Lok et al [ 31 ] introduced the family of SAPO zeolite materials.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review

Usman

2022

Membranes

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In the zeolite family, the silicoaluminophosphate (SAPO)-34 zeolite has a unique chemical structure, distinctive pore size, adsorption characteristics, as well as chemical and thermal stability, and recently, has attracted much research attention. Increasing global carbon dioxide (CO2) emissions pose a serious environmental threat to humans, animals, plants, and the entire environment. This mini-review summarizes the role of SAPO-34 zeolite membranes, including mixed matrix membranes (MMMs) and pure SAPO-34 membranes in CO2 separation. Specifically, this paper summarizes significant developments in SAPO-34 membranes for CO2 removal from air and natural gas. Consideration is given to a variety of successes in SAPO-34 membranes, and future ideas are described in detail to foresee how SAPO-34 could be employed to mitigate greenhouse gas emissions. We hope that this study will serve as a detailed guide to the use of SAPO-34 membranes in industrial CO2 separation.

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“…Catalysis plays a vital role in our daily life. Various types of catalysts have been reported for the conversion of waste into useful products, including zeolites [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ], metal and metal oxides [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ], nitrides [ 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ], carbon-based catalysts [ 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 ], metal complexes [ 64 , …”

Section: Introductionmentioning

confidence: 99%

Electrochemical Reduction of CO2: A Review of Cobalt Based Catalysts for Carbon Dioxide Conversion to Fuels

et al. 2021

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Electrochemical CO2 reduction reaction (CO2RR) provides a promising approach to curbing harmful emissions contributing to global warming. However, several challenges hinder the commercialization of this technology, including high overpotentials, electrode instability, and low Faradic efficiencies of desirable products. Several materials have been developed to overcome these challenges. This mini-review discusses the recent performance of various cobalt (Co) electrocatalysts, including Co-single atom, Co-multi metals, Co-complexes, Co-based metal–organic frameworks (MOFs), Co-based covalent organic frameworks (COFs), Co-nitrides, and Co-oxides. These materials are reviewed with respect to their stability of facilitating CO2 conversion to valuable products, and a summary of the current literature is highlighted, along with future perspectives for the development of efficient CO2RR.

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Study on the Hydrotreating Catalysts Containing Phosphorus of Coal Tar to Clean Fuels

Cited by 8 publications

References 9 publications

Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures

Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures

Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review

Electrochemical Reduction of CO2: A Review of Cobalt Based Catalysts for Carbon Dioxide Conversion to Fuels

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