2021年9月1日 · In this work, a highly active and coke resistant Ni/CeZrO 2 catalyst for dry reforming of methane has been prepared via the DBD plasma decomposition of nickel precursor followed by hydrogen reduction.

2020年5月11日 · Here, we demonstrate how varying the particle size of the support (ceria–zirconia) can be used to tune the metal–support interactions, resulting in a substantially enhanced CO 2 hydrogenation rate.

2020年7月5日 · The TPR peaks of Ni@SiO 2 core-shell structure were shifted to higher temperatures in comparison to Ni/SiO 2, indicating that nickel oxide was hardly reduced in the core-shell structure [37]. This result was associated with a stronger metal-support interaction.

2022年8月9日 · The characterizations and catalytic performance evaluations revealed that appropriate impregnation of copper on CeZrO x improves the H 2 activation ability as well as effectively increases oxygen vacancy concentration. The synergistic effect of more active H and oxygen vacancy results in forming abundant oxygenated intermediate species.

2024年10月29日 · This work developed Pd-CeZrO x samples for the simultaneous elimination of benzene and toluene. Firstly, CeZrO x supports were synthesized using several methods (co-precipitation, CTAB template co-precipitation, and sol–gel method

研究了由Ag，Fe，Pt和Pd促进的Ni / CeZrO 2催化剂用于甲烷的自热重整和甲烷的部分氧化。 通过BET表面积，X射线衍射（XRD），H 2程序升温还原（TPR），CO 2（CO 2程序升温解吸）来确定催化剂的性能。

2022年5月4日 · The second peak in the H 2-TPR profile of the CeZrO 2-supported Ni catalyst indicates the reduction of CeO 2. The addition of CeO 2 to ZrO 2 to form CeZrO 2 can increase the OSC and redox properties of the mixed metal oxide.

2021年8月1日 · In this study, NiO-promoted κ-CeZrO 4 functional oxygen carriers (OCs) were designed and synthesized for the CLPOR of methane, with excellent lattice oxygen (LO) transmission performance and structural stability, aiming to reduce the energy penalty and temperature required for methane conversion.

The TPR results are generally consistent with the observations by the XRD. NiO over Al 2 O 3 , CeO 2 , ZrO 2 , and CeZrO is reducible below 850 8 C, even though the extent of interactions is ...

Using CeZrO x -modified Al 2 O 3 (HTASO5) as support, the catalyst exhibited good catalytic performance (TOF CH4 = 8.0 × 10 −2 s −1, TOF H2 = 10.5 × 10 −2 s −1) and carbon resistance for steam-methane reforming (SMR) reaction. Moreover, CeZrO x was able to enhance water-gas shift (WGS) reaction for more hydrogen production.

2021年7月30日 · Nickel (Ni) based catalysts with ceria-zirconia (Ce-Zr) support can be used to tune the metal-support interactions, resulting in a potentially enhanced CO 2 hydrogenation rate and elongation of the catalyst lifespan. The thermodynamics of RWGS reaction is favored at high temperature for CO 2 conversion.

Morphological and structural characterization by TEM and Raman spectroscopy showed that Pt sintering is suppressed on both structures and the doping with Zr led to the CeZrO 2 solid solution formation. A combination of TPR, oxygen isotopic exchange and DRIFTS measurements demonstrated that embedded Pt nanoparticles interact more strongly with ...

2009年6月1日 · H2 temperature-programmed reduction (H2-TPR) and temperature-programmed surface reaction (TPSR) studies demonstrated that addition of the CeZrO2 resulted in an increase in the reducibility and oxygen transfer ability of the support, Ni/Ce0.5ZrO0.5O2-SiO2 showed improved redox properties compared with Ni/SiO2 due to a low-temperature reduction.

结果发现，以NaOH作为沉淀剂制备的CeZrO 2 固溶体比表面积大（68.8 m 2 ·g-1 ）、氧活动性强[表面氧耗氢量达1143 μmol·（g cat（-1]，同时贵金属Pt在其表面高度分散，因此制得的Pt/CeZrO 2 柴油车DOC催化剂催化效果好，特别是催化氧化碳氢化合物（C 3 H 6 ），T 90 比H 2 C 2 ...

2016年1月21日 · Temperature‐programmed reduction (TPR) studies revealed significant alteration in the reducibility of the support due to introduction of the active metal. Catalytic ethanol steam reforming (ESR) over the supported catalyst was performed in a tubular microreactor under varying temperatures and space velocities at a constant ethanol‐to ...

2020年3月18日 · Three Ni/CeZrO 2 /MgAl 2 O 4 catalysts synthesized using different Zr/Ce molar ratios (0.25, 1, and 4) were studied for methane tri-reforming. The catalysts were characterized using XRD, 27 Al-NMR, H 2 -TPR, CO 2-TPD, XPS, and in situ techniques (XPD and XANES).

2017年5月3日 · A series of WO 3 /CeZrO 2 catalysts, prepared at different calcination temperatures (400, 500, 600 and 700 °C) of cerium–zirconium mixed oxides (CeZrO 2) for the selective catalytic reduction of NO x with ammonia (NH 3-SCR), were investigated via various characterizations, such as N 2 physisorption, XRD, Raman, NH 3-TPD, DRIFTS, XPS and H …

2023年1月9日 · The resulting materials constitute an ideal case study to thoroughly understand cerium redox properties. The Ce3+/Ce4+ redox properties are investigated by H2-TPR experiments exploited by in situ FT-IR and Ce M5-edge AP-NEXAFS spectroscopy. In the latter case, Ce3+ formation is quantified using the MCR-ALS protocol.

2021年7月1日 · A combination of TPR, oxygen isotopic exchange and DRIFTS measurements demonstrated that embedded Pt nanoparticles interact more strongly with ceria than supported Pt, and as a consequence, reactive lattice oxygen becomes more abundant on the catalyst surface, promoting the mechanism of carbon gasification over Pt nanoparticle.

2023年1月9日 · The synthesis of Ce-UiO-66 and CeZr-UiO-66 and their subsequent calcination are presented here as a simple and inexpensive approach for achieving homogeneous and stable CeO 2 and CeZrO x nanocrystals. The resulting materials constitute an ideal case study to thoroughly understand cerium redox properties.