Catalytically active interfaces in titania nanorod-supported copper catalysts for CO oxidation

Khan, Wasim Ullah; Chen, Season S.; Tsang, Daniel C.W.; Teoh, Wey Yang; Hu, Xijun; Lam, Frank Leung Yuk; Yip, Alex C.K.

doi:10.1007/s12274-020-2647-6

Cited by 21 publications

(9 citation statements)

References 65 publications

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“…Eventually, the oxidation of the adsorbed CO proceeds through the reaction with the adsorbed O atom. This mechanism was reported recently by Wasim et al as the leading mechanism in Cu-titanium nanorod catalysts [ 67 ]. Several studies in the open literature proposed Langmuir–Hinshelwood mechanism for Cu and Pd supported catalysts as well [ 19 , 68 ].…”

Section: Resultssupporting

confidence: 69%

CO Oxidation at Near-Ambient Temperatures over TiO2-Supported Pd-Cu Catalysts: Promoting Effect of Pd-Cu Nanointerface and TiO2 Morphology

et al. 2021

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Significant improvement of the catalytic activity of palladium-based catalysts toward carbon monoxide (CO) oxidation reaction has been achieved through alloying and using different support materials. This work demonstrates the promoting effects of the nanointerface and the morphological features of the support on the CO oxidation reaction using a Pd-Cu/TiO2 catalyst. Pd-Cu catalysts supported on TiO2 were synthesized with wet chemical approaches and their catalytic activities for CO oxidation reaction were evaluated. The physicochemical properties of the prepared catalysts were studied using standard characterization tools including SEM, EDX, XRD, XPS, and Raman. The effects of the nanointerface between Pd and Cu and the morphology of the TiO2 support were investigated using three different-shaped TiO2 nanoparticles, namely spheres, nanotubes, and nanowires. The Pd catalysts that are modified through nanointerfacing with Cu and supported on TiO2 nanowires demonstrated the highest CO oxidation rates, reaching 100% CO conversion at temperature regime down to near-ambient temperatures of ~45 °C, compared to 70 °C and 150 °C in the case of pure Pd and pure Cu counterpart catalysts on the same support, respectively. The optimized Pd-Cu/TiO2 nanowires nanostructured system could serve as efficient and durable catalyst for CO oxidation at near-ambient temperature.

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Section: Resultssupporting

confidence: 69%

CO Oxidation at Near-Ambient Temperatures over TiO2-Supported Pd-Cu Catalysts: Promoting Effect of Pd-Cu Nanointerface and TiO2 Morphology

et al. 2021

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“…Among the various well-established CO 2 conversion processes, such as electrochemical catalysis, photocatalysis, and thermal catalysis, methane reforming using carbon dioxide, commonly known as dry reforming of methane (DRM), has recently attracted scientists primarily because DRM converts major greenhouse gases, i.e., carbon dioxide and methane, to synthesize hydrogen and carbon monoxide, also called synthesis gas, which is further utilized to produce liquid hydrocarbons [1][2][3][4][5][6][7][8]. Hence, the DRM process not only plays a role in greenhouse gas mitigation and thus serves as a cause of climate change, but also generates synthesis gas, a mixture of equimolar hydrogen and carbon monoxide suitable for the production of hydrocarbon via the well-known Fischer-Tropsch synthesis process [9][10][11][12][13]. It is well established that the proper choice and suitable design of a catalyst plays significant role in catalytic activity and stability during DRM [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

The Role of Strontium in CeNiO3 Nano-Crystalline Perovskites for Greenhouse Gas Mitigation to Produce Syngas

et al. 2022

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The transition metal-based catalysts for the elimination of greenhouse gases via methane reforming using carbon dioxide are directly or indirectly associated with their distinguishing characteristics such as well-dispersed metal nanoparticles, a higher number of reducible species, suitable metal–support interaction, and high specific surface area. This work presents the insight into catalytic performance as well as catalyst stability of CexSr1−xNiO3 (x = 0.6–1) nanocrystalline perovskites for the production of hydrogen via methane reforming using carbon dioxide. Strontium incorporation enhances specific surface area, the number of reducible species, and nickel dispersion. The catalytic performance results show that CeNiO3 demonstrated higher initial CH4 (54.3%) and CO2 (64.8%) conversions, which dropped down to 13.1 and 19.2% (CH4 conversions) and 26.3 and 32.5% (CO2 conversions) for Ce0.8Sr0.2NiO3 and Ce0.6Sr0.4NiO3, respectively. This drop in catalytic conversions post strontium addition is concomitant with strontium carbonate covering nickel active sites. Moreover, from the durability results, it is obvious that CeNiO3 exhibited deactivation, whereas no deactivation was observed for Ce0.8Sr0.2NiO3 and Ce0.6Sr0.4NiO3. Carbon deposition during the reaction is mainly responsible for catalyst deactivation, and this is further established by characterizing spent catalysts.

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“…Dry, or carbon dioxide reforming of methane (DRM) has gained attention in recent decades, mainly due to the fact that DRM consumes prevalent greenhouse gases i.e., methane and carbon dioxide to produce synthetic gas, which serves as an important raw material for liquid hydrocarbon formation [1][2][3][4][5][6][7][8]. Hence, DRM offers two benefits: (a) conversion of major greenhouse gases into a value-added product, and (b) the DRM product, i.e., syngas, offers equimolar H 2 and CO, which results in hydrocarbon production via Fischer-Tropsch (FT) synthesis [9][10][11][12][13]. The catalytic activity and stability are mainly dependent on the choice of a suitable catalyst [14].…”

Section: Introductionmentioning

confidence: 99%

Syngas Production via CO2 Reforming of Methane over SrNiO3 and CeNiO3 Perovskites

et al. 2021

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The development of a transition-metal-based catalyst with concomitant high activity and stability due to its distinguishing characteristics, yielding an abundance of active sites, is considered to be the bottleneck for the dry reforming of methane (DRM). This work presents the catalytic activity and durability of SrNiO3 and CeNiO3 perovskites for syngas production via DRM. CeNiO3 exhibits a higher specific surface area, pore volume, number of reducible species, and nickel dispersion when compared to SrNiO3. The catalytic activity results demonstrate higher CH4 (54.3%) and CO2 (64.8%) conversions for CeNiO3, compared to 22% (CH4 conversion) and 34.7% (CO2 conversion) for SrNiO3. The decrease in catalytic activity after replacing cerium with strontium is attributed to a decrease in specific surface area and pore volume, and nickel active sites covered with strontium carbonate. The stability results reveal the deactivation of both the catalysts (SrNiO3 and CeNiO3) but SrNiO3 showed more deactivation than CeNiO3, as demonstrated by deactivation factors. The catalyst deactivation is mainly attributed to carbon deposition and these findings are verified by characterizing the spent catalysts.

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Catalytically active interfaces in titania nanorod-supported copper catalysts for CO oxidation

Cited by 21 publications

References 65 publications

CO Oxidation at Near-Ambient Temperatures over TiO2-Supported Pd-Cu Catalysts: Promoting Effect of Pd-Cu Nanointerface and TiO2 Morphology

CO Oxidation at Near-Ambient Temperatures over TiO2-Supported Pd-Cu Catalysts: Promoting Effect of Pd-Cu Nanointerface and TiO2 Morphology

The Role of Strontium in CeNiO3 Nano-Crystalline Perovskites for Greenhouse Gas Mitigation to Produce Syngas

Syngas Production via CO2 Reforming of Methane over SrNiO3 and CeNiO3 Perovskites

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