Preparation and CO 2 hydrogenation catalytic properties of alumina microsphere supported Cu-based catalyst by deposition-precipitation method

Zhang, Chen; Yang, Haiyan; Gao, Peng; Zhu, He; Zhong, Liangshu; Wang, Hui; Wei, Wei; Sun, Yuhan

doi:10.1016/j.jcou.2016.11.015

Cited by 52 publications

(33 citation statements)

References 43 publications

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“…As known, the basic properties of catalysts can be divided into two types of basic site by a different range of CO 2 desorption temperature such as weak and moderate to strong basic site (Zhang et al, 2011;Tursunov et al, 2017;Zhang et al, 2017). The weak basic sites (low desorption temperature) were assigned to the structural OH groups on surface catalysts, while moderate to strong basic sites (high desorption temperature) were related to metal-oxygen pairs and the coordinately unsaturated O 2ions (Zhang et al, 2017;Dasireddy et al, 2018). The desorption peaks of CO 2 (CO 2 -TPD profiles) of catalysts are illustrated in Figure 5.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Kamsuwan

Krutpijit

Praserthdam

et al. 2021

Heliyon

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Comparative study of Cu/ZnO/Al 2 O 3 (CZA) catalysts with different Cu loading in CO and CO 2 hydrogenation at 250 C under atmospheric pressure was investigated. Results showed that methanol was the major product for CO hydrogenation, while the main product for CO 2 hydrogenation was CO. High Cu loading catalyst exhibited high catalytic activity in both CO and CO 2 hydrogenation. Low Cu loading catalyst showed deactivation with time on stream after 1-2 h by coke formation containing both amorphous and graphitic cokes for both CO and CO 2 hydrogenation.

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Section: Catalyst Characterizationmentioning

confidence: 99%

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Kamsuwan

Krutpijit

Praserthdam

et al. 2021

Heliyon

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“…The more challenging internal alkenes, norbornene and 2-octene, were transformed into corresponding aldehydes in good yield (entries [13][14]. Finally, the reaction proceeded smoothly with styrene derivatives, furnishing aldehydes in moderate to excellent yields, though with opposite regioselectivities (entries [15][16][17].…”

Section: Entrymentioning

confidence: 99%

Chemo- and Regioselective Hydroformylation of Alkenes with CO2/H2 over a Bifunctional Catalyst

Hua

Liu

Yin

et al. 2020

Preprint

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Combining CO2 and H2 to prepare building blocks for high-value-added products is an attractive yet challenging approach. A general and selective rhodium-catalyzed hydroformylation of alkenes using CO2/H2 as a syngas surrogate is described here. With this protocol, the desired aldehydes can be obtained in up to 97% yield and 93/7 regioselectivity under mild reaction conditions (25 bar, 80 ºC). Key-to-success is the use of bifunctional Rh/PTA catalyst (PTA: 1,3,5-triaza-7-phosphaadamantane), which facilitates both CO2 hydrogenation and hydroformylation. Notably, monodentate PTA exhibited better activity and regioselectivity than common bidentate ligands, which might be ascribed to its built-in basic site and tris-chelated mode. Mechanistic studies indicate that the transformation proceeds through cascade steps, involving free HCOOH production through CO2 hydrogenation, fast release of CO, and rhodium-catalyzed conventional hydroformylation. Moreover, the unconventional hydroformylation pathway, in which HCOOAc acts as a direct C1 source, has also been proved feasible with superior regioselectivity than that of CO pathway.

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“…On the contrary, the dispersion of copper over the surface of MET6 and MET7 is not homogenous. It is known that the better distribution of the metal species over the catalyst surface results in relatively lower local metal loading and increases the portion of the strong basic sites, which positively contribute to selective methanol formation [27,28]. Having generally reviewed all these and without going into details, the main focus in this step is to explain the observed different selectivity of the investigated catalysts.…”

Section: Catalyst Characterizationsmentioning

confidence: 99%

“…As it can be seen in Figure 4, there is a significant difference between the performances of the freshly reduced catalysts in normal operation and the reduced catalysts after being exposed to oxygen even for a short time. In order to explain this, it should be highlighted that the copper content of the calcined catalyst in its body and also on its surface are in CuO (oxide) form in a dynamic interaction with the ZnO and Al 2 O 3 components [28]. Reducing the catalyst converts the copper oxide to copper.…”

Section: Stability Test and Analysismentioning

confidence: 99%

Multi-Scale Analysis of Integrated C1 (CH4 and CO2) Utilization Catalytic Processes: Impacts of Catalysts Characteristics up to Industrial-Scale Process Flowsheeting, Part I: Experimental Analysis of Catalytic Low-Pressure CO2 to Methanol Conversion

et al. 2020

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A multi-aspect analysis of low-pressure catalytic hydrogenation of CO2 for methanol production is reported in the first part (part I) of this paper. This includes an extensive review of distinguished low-pressure catalytic CO2-hydrogenation systems. Specifically, the results of the conducted systematic experimental investigation on the impacts of synthesis and micro-scale characteristics of the selected Cu/ZnO/Al2O3 model-catalysts on their activity and stability are discussed. The performance of the investigated Cu/ZnO/Al2O3 catalysts, synthesized via different methods, were tested under a targeted range of operating conditions in this research. Specifically, the performances of these tested Cu/ZnO/Al2O3 catalysts with regard to the impacts of the main operating parameters, namely H2/CO2 ratio (at stoichiometric -3-, average -6- and high -9- ratios), temperature (in the range of 160–260 °C) and the lower and upper values of physically achievable gas hourly space velocity (GHSV) (corresponding to 200 h−1 and 684 h−1, respectively), were analyzed. It was found that the catalyst prepared by the hydrolysis co-precipitation method, with a homogenously distributed copper content over its entire surface, provides a promising methanol yield of 21% at a reaction temperature of 200 °C, lowest tested GHSV, highest tested H2/CO2 ratio (9) and operating pressure (10 bar). This is in line with other promising results so far reported for this catalytic system even in pilot-plant scale, highlighting its potential for large-scale methanol production. To analyze the findings in more details, the thermal-reaction performance of the system, specifically with regard to the impact of GHSV on the CO2-conversion and methanol selectivity, and yield were experimentally investigated. Moreover, the stability of the selected catalysts, as another crucial factor for potential industrial operation of this system, was tested under continual long-term operation for 150 h, the reaction-reductive shifting-atmospheres and also even after introducing oxygen to the catalyst surface followed by hydrogen reduction-reaction tests. Only the latter state was found to affect the stable performance of the screened catalysts in this research. In addition, the reported experimental reactor performances have been analyzed in the light of equilibrium-based calculated achievable performance of this reaction system. In the performed multi-scale analysis in this research, the requirements for establishing a selective-stable catalytic performance based on the catalyst- and reactor-scale analyses have been identified. This will be combined with the techno–economic performance analysis of the industrial-scale novel integrated process, utilizing the selected catalyst in this research, in the form of an add-on catalytic system under 10 bar pressure and H2/CO2 ratio (3), for efficiently reducing the overall CO2-emission from oxidative coupling of methane reactors, as reported in the second part (part II) of this paper.

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Preparation and CO 2 hydrogenation catalytic properties of alumina microsphere supported Cu-based catalyst by deposition-precipitation method

Cited by 52 publications

References 43 publications

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Comparative study on the effect of different copper loading on catalytic behaviors and activity of Cu/ZnO/Al2O3 catalysts toward CO and CO2 hydrogenation

Chemo- and Regioselective Hydroformylation of Alkenes with CO2/H2 over a Bifunctional Catalyst

Multi-Scale Analysis of Integrated C1 (CH4 and CO2) Utilization Catalytic Processes: Impacts of Catalysts Characteristics up to Industrial-Scale Process Flowsheeting, Part I: Experimental Analysis of Catalytic Low-Pressure CO2 to Methanol Conversion

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