Liquid-phase hydrogenation of thiophenes on palladium sulfide catalysts

Zirka, A. A.; Mashkina, A. V.

doi:10.1007/bf02755377

Cited by 9 publications

(2 citation statements)

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“…There are two main methods: the first one is to use acidic support. Some studies have found that sulfates on acidic oxides like SiO 2 , TiO 2 , or ZrO 2 are less stable and easier to remove than on the alkaline oxide . The acidic support is able to adsorb less sulfur species, which protects the active component Pd 0 from the formation of PdSO 4 .…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have found that sulfates on acidic oxides like SiO 2 , TiO 2 , or ZrO 2 are less stable and easier to remove than on the alkaline oxide. 10 The acidic support is able to adsorb less sulfur species, which protects the active component Pd 0 from the formation of PdSO 4 . 11 The second is to add additional active components to form catalyst systems with dual activity, such as the Pd−Pt catalyst, 12 to avoid sulfur poisoning.…”

Section: Introductionmentioning

confidence: 99%

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Effect of PdS_x on Sulfur Resistance of Pd-Based Catalysts for CO Oxidation

Qian

Bian

et al. 2023

Ind. Eng. Chem. Res.

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Carbon monoxide (CO) is one of the most widely spread and enormous pollutants in the atmosphere, and CO catalytic oxidation is the primary method for reducing CO levels. Pd catalysts show excellent catalytic performance in CO catalytic oxidation, yet the majority of Pd-based catalysts are weakly resistant to sulfur. SO2, which is particularly harmful to the catalyst, is frequently present in industrial exhaust gases. Therefore, in this report, we have used a H2S-pretreated Pd-based catalyst for CO catalytic oxidation with outstanding catalytic activity, sulfur resistance, and high stability. A series of characterizations were carried out on the fresh and used catalysts, revealing that the catalytic activity is determined by Pd0 and the sulfur resistance is dependent on PdS x species. The PdS x content is adjusted by changing the concentration of H2S in the gas sulfidation process. The catalytic activity of the PdS x catalyst is much superior to that of other Pd-based catalysts, enabling complete oxidation of CO at around 200 °C. For the long-term test, the PdS x catalyst showed good ability and the conversion of CO was maintained at 94.93% in the presence of 500 ppm SO2 for 300 h, indicating the excellent stability. At last, CO catalytic oxidation and sulfur resistance mechanisms are presented and discussed, which will provide an insight in the design of sulfur-resistant catalysts.

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Section: Introductionmentioning

confidence: 99%