Influence of ZrO2 properties on catalytic hydrodechlorination of chlorobenzene over Pd/ZrO2 catalysts

Shao, Yun; Xu, Zhaoyi; Wan, Haiqin; Chen, Huan; Liu, Fengling; Li, Liyuan; Zheng, Shourong

doi:10.1016/j.jhazmat.2010.02.070

Cited by 60 publications

(24 citation statements)

References 44 publications

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“…42 A widely accepted redox mechanism suggested that PdO was the main active species for the oxidation of CH 4 . 43,44 The results of H 2 -TPR were consistent with the results of the catalytic activity. The differences in reduction temperature for Fig.8 H 2 -TPR profiles of the five catalysts the catalysts may be due to different strength interaction between noble metal and the supports.…”

Section: H 2 -Tpr Resultssupporting

confidence: 82%

Effects of Zr Addition on the Performance of the Pd-Pt/Al2O3 Catalyst for Lean-Burn Natural Gas Vehicle Exhaust Purification

WANG¹,

Shang²,

Xu³

et al. 2015

Acta Physico-Chimica Sinica

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性组分Pd、Pt通过共浸渍的方法浸渍到以上载体材料上制备得到一系列整体式催化剂. 分别采用低温N 2 吸脱附、X射线衍射(XRD)、H 2 程序升温还原(H 2-TPR)、O 2 程序升温氧化(O 2-TPD)及X射线光电子能谱对制备的催化剂进行表征. 结果显示Zr的加入使催化剂的载体材料结晶度提高, 活性组分的分散度也得到了相应的提

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Section: H 2 -Tpr Resultssupporting

confidence: 82%

Effects of Zr Addition on the Performance of the Pd-Pt/Al2O3 Catalyst for Lean-Burn Natural Gas Vehicle Exhaust Purification

WANG¹,

Shang²,

Xu³

et al. 2015

Acta Physico-Chimica Sinica

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“…The reduction peak at 600 °C belongs to ZrO 2 . After adding Zr into the Pd-based catalysts, the peaks appear at 360 and 400 °C, representing the reduction of the Pd–O–Zr and PdO–ZrO 2 solid solutions, respectively. , With the formation of this structure, the reduction peaks of PdO and ZrO 2 are close to each other, which implies the formation of the Pd–Zr alloy structure. As shown in Figure , the Pd–O–Zr solid solution is transformed into a PdO–ZrO 2 solid solution as the mass ratio of Pd/Zr increases from 1:2 to 1:4, and the temperature of the reduction peak also rises accordingly, which means that the interaction between palladium and zirconium on the bimetallic Pd–Zr catalysts is indeed increasing.…”

Section: Resultsmentioning

confidence: 90%

Controlled Hydrodeoxygenation of Biobased Ketones and Aldehydes over an Alloyed Pd–Zr Catalyst under Mild Conditions

Ding

Zong

et al. 2021

ACS Sustainable Chem. Eng.

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The substitution of green hydrogen donors for replacing high-pressure H 2 to achieve biomass derived ketone and aldehyde hydrodeoxygenation (HDO) under mild conditions has attracted widespread attention. However, it remains a considerable challenge to get rid of acid additives and control product selectivity. Herein, a series of bimetallic Pd−M/HZSM-5 catalysts (M = Zr, Mn, Zn, or La) were fabricated for controlled hydrodeoxygenation of biobased ketones and aldehydes (acetophenone, benzophenone, 4-hydroxyacetophenone, vanillin, furfural) using polymethylhydrosiloxane (PMHS) as the green H-donor, in which >99% conversion and >99% selectivity to ethylbenzene were achieved for hydrodeoxygenation of acetophenone as the probe within 3 h at 35 °C over the as-prepared 0.5%Pd−2.0%Zr/HZSM-5 catalyst with a Pd/ Zr mass ratio of 1:4. According to characterizations of TEM-HAADF, XPS, ESR, and H 2 -TPR, the Pd−Zr alloy structure was formed on the bimetallic Pd−Zr/HZSM-5 catalyst, promoting the transform of Pd−O−Zr solid solution to PdO−ZrO 2 and the generation of oxygen vacancy. Moreover, the abundant of oxygen vacancies on the alloyed Pd−Zr/HZSM-5 catalysts enhance the dissociation of silanes to provide the abundance of hydrogen protons, greatly accelerating the hydrogenation of biobased ketones and aldehydes, and then the acid site of the Pd−Zr/HZSM-5 catalyst promotes the dehydration of the intermediates (alcohols) to hydrocarbons. Furthermore, the as-fabricated Pd−Zr/HZSM-5 alloy catalyst can achieve an excellent recycling capability after six uses and exhibits universality toward various biobased ketones and aldehydes at 35 °C. The present findings provide new insights into the design of selective HDO of biomass in a green process.

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“…Among them, Pd is the metal least affected by the catalyst poisoning properties of the chloride ions released [20,21] and is commonly identified as the most suitable active phase for liquid-phase HDC [20,22]. The catalytic support plays also an important role in both catalytic activity and stability and has been investigated on carbon [6,[23][24][25], alumina [14,16,26], zirconia [27,28] and pillared clays [29,30], among other, with alumina and activated carbon being the most reported systems in the literature [15,31,32]. It is generally accepted that alumina presents a high mechanical resistance and a strong interaction with supported metals leading to enhanced metal dispersion but it is also quite sensitive to the HCl formed upon the reaction [20,33].…”

Section: Introductionmentioning

confidence: 99%

Deducing kinetic constants for the hydrodechlorination of 4-chlorophenol using high adsorption capacity catalysts

Muñoz

Kaspereit

Etzold

2016

Chemical Engineering Journal

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Employing high surface area supports for catalytic hydrodechlorination can result in pronounced adsorption of reactants, intermediates and products. The influence of these sorption processes on the activity and selectivity upon 4-chlorophenol (4-CP) hydrodechlorination in aqueous solution has been studied using four commercial Pd/Al2O3 and Pd/AC catalysts at ambient pressure within the temperature range of 20-40°C ([4-CP]0=0.78-2.90mmolL-1, [catalyst]=1gL-1, 50NmLH2min-1). The adsorption capacity of the catalysts was independently evaluated. The Al2O3-based catalyst did not show any significant adsorption of those species whereas the activated carbon materials presented in all cases high uptakes (e.g. up to 2.4mmol4-CPgcat -1). In order to deduce true kinetic constants also for these catalysts, a kinetic model was developed, which accounts for the consecutive reaction and sorption processes in parallel. This expanded model resulted in a reasonable fit, can thus be used for comparison of different catalysts regardless their sorption capacity and allows predicting successfully the selectivity to the reaction productsThe authors gratefully acknowledge the funding of the German Research Council (DFG), which within the framework of its “Excellence Initiative” supports the Cluster of Excellence “Engineering of Advanced Materials” (www.eam.fau.de) at the University of Erlangen-Nurember

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Influence of ZrO2 properties on catalytic hydrodechlorination of chlorobenzene over Pd/ZrO2 catalysts

Cited by 60 publications

References 44 publications

Effects of Zr Addition on the Performance of the Pd-Pt/Al<sub>2</sub>O<sub>3</sub> Catalyst for Lean-Burn Natural Gas Vehicle Exhaust Purification

Effects of Zr Addition on the Performance of the Pd-Pt/Al<sub>2</sub>O<sub>3</sub> Catalyst for Lean-Burn Natural Gas Vehicle Exhaust Purification

Controlled Hydrodeoxygenation of Biobased Ketones and Aldehydes over an Alloyed Pd–Zr Catalyst under Mild Conditions

Deducing kinetic constants for the hydrodechlorination of 4-chlorophenol using high adsorption capacity catalysts

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