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Perovskite LaNiO3 Nanocrystals inside Mesostructured Cellular Foam Silica: High Catalytic Activity and Stability for CO2 Methanation
Energy Technology ( IF 3.6 ) Pub Date : 2020-01-15 , DOI: 10.1002/ente.201901164 Tengfei Zhang 1 , Qing Liu 1
Energy Technology ( IF 3.6 ) Pub Date : 2020-01-15 , DOI: 10.1002/ente.201901164 Tengfei Zhang 1 , Qing Liu 1
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To simultaneously obtain high catalytic activity and stability, LaNiO3‐based catalysts supported on mesostructured cellular foam (MCF) silica are prepared by a citric acid–assisted impregnation method and applied for a CO2 methanation reaction. These MCF‐supported perovskite LaNiO3 (LaNiO3/MCF) samples are characterized by nitrogen adsorption, X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, H2‐temperature‐programmed reduction, and X‐ray photoelectron spectroscopy. The results indicate that these catalysts offer highly dispersed La2O3 and metallic Ni nanoparticles with intimate contact inside the pores of MCF support after reduction in H2 flow. Compared with the catalyst prepared by the coimpregnation method (30LNOM‐Im‐650), the citric acid–assisted LaNiO3/MCF (30LNOM‐C‐650) catalyst exhibits a much higher catalytic activity due to its higher Ni dispersion and stronger interrelationship between La2O3 and Ni species. In the 100 h‐lifetime test under the conditions of 450 °C, 0.1 MPa, and a high weight hourly space velocity of 60 000 mL g−1 h−1, 30LNOM‐C‐650 also shows a high long‐term stability without Ni sintering, which is attributed to the formation of enhanced interaction between metallic Ni and La2O3 via La2O2CO3 species on their interface as well as the confinement effect of the MCF support.
中文翻译：
介孔泡沫硅中的钙钛矿LaNiO3纳米晶体：高催化活性和CO 2甲烷化的稳定性
为了同时获得较高的催化活性和稳定性，通过柠檬酸辅助浸渍法制备了负载在介孔泡沫（MCF）二氧化硅上的LaNiO 3基催化剂，并将其用于CO 2甲烷化反应。这些由MCF支持的钙钛矿LaNiO 3（LaNiO 3 / MCF）样品的特征在于氮吸附，X射线衍射，扫描电子显微镜，透射电子显微镜，H 2程序升温还原和X射线光电子能谱。结果表明，这些催化剂提供了高度分散的La 2 O 3H 2流量减少后，金属镍纳米颗粒与MCF载体的孔内部紧密接触。与共浸渍法制备的催化剂（30LNOM-Im-650）相比，柠檬酸辅助的LaNiO 3 / MCF（30LNOM-C-650）催化剂由于其较高的Ni分散性和更强的相互关系而表现出更高的催化活性。 La 2 O 3和Ni物种。在450°C，0.1 MPa和60000 mL g -1 h -1的高重量时空速度的条件下进行100 h寿命测试时，30LNOM‐C‐650也显示出很高的长期稳定性，而没有Ni烧结，这归因于金属Ni与La之间增强的相互作用形成2 ö 3通过的La 2 ö 2 CO 3种其接口上以及在MCF载体的限制效应。
更新日期：2020-01-15
中文翻译：
介孔泡沫硅中的钙钛矿LaNiO3纳米晶体：高催化活性和CO 2甲烷化的稳定性
为了同时获得较高的催化活性和稳定性，通过柠檬酸辅助浸渍法制备了负载在介孔泡沫（MCF）二氧化硅上的LaNiO 3基催化剂，并将其用于CO 2甲烷化反应。这些由MCF支持的钙钛矿LaNiO 3（LaNiO 3 / MCF）样品的特征在于氮吸附，X射线衍射，扫描电子显微镜，透射电子显微镜，H 2程序升温还原和X射线光电子能谱。结果表明，这些催化剂提供了高度分散的La 2 O 3H 2流量减少后，金属镍纳米颗粒与MCF载体的孔内部紧密接触。与共浸渍法制备的催化剂（30LNOM-Im-650）相比，柠檬酸辅助的LaNiO 3 / MCF（30LNOM-C-650）催化剂由于其较高的Ni分散性和更强的相互关系而表现出更高的催化活性。 La 2 O 3和Ni物种。在450°C，0.1 MPa和60000 mL g -1 h -1的高重量时空速度的条件下进行100 h寿命测试时，30LNOM‐C‐650也显示出很高的长期稳定性，而没有Ni烧结，这归因于金属Ni与La之间增强的相互作用形成2 ö 3通过的La 2 ö 2 CO 3种其接口上以及在MCF载体的限制效应。
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