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高稳定性和选择性Ni/ZrO₂纳米纤维催化剂,用于高效的CO₂甲化

Mengyuan Zhang^1,2, Jian Ye¹, Ying Qu¹

¹State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China.

ACS applied materials & interfaces

|June 26, 2024

概括

电Ni/ZrO2纳米纤维显著增强CO2甲化,在350°C达到81%的CO2转化和99%的CH4选择性. 这种性能提升,归因于高表面积和氧气空缺,为高效的二氧化碳利用提供了有前途的途径.

科学领域:

材料科学材料科学材料科学
催化剂是一种催化剂.
化学工程是化学工程的重要组成部分.

背景情况:

基于的氧化物是二氧化碳 (CO2) 甲化的主要催化剂.
目前基于Ni的催化剂在低温活动,选择性和稳定性方面面临挑战.
提高二氧化碳甲化效率对于碳捕获和利用技术至关重要.

研究的目的:

为二氧化碳甲化开发高性能Ni/ZrO2催化剂.
通过不同的方法制备的Ni/ZrO2催化剂的结构-活性关系的研究.
了解表面积,氧气空缺和吸附点在催化性能中的作用.

主要方法:

电方法用于合成Ni/ZrO2纳米纤维 (Ni/ZrO2-ES).
用于制备一个比较Ni/ZrO2催化剂 (Ni/ZrO2-CP) 的共同沉方法.
包括EPR,O1S XPS,CO2-TPD和in situ DRIFTS在内的表征技术.
在350°C的CO2甲化中对催化性能的评估.

主要成果:

Ni/ZrO2-ES纳米纤维表现出很大的表面积 (101.2 m2/g).
Ni/ZrO2-ES获得了卓越的催化性能:81%的CO2转化率和99%的CH4选择性在350°C时保持100小时的稳定性.
Ni/ZrO2-CP的性能显著下降:54%的CO2转化率和90%的CH4选择性,具有快速的失活.
与Ni/ZrO2-CP相比,Ni/ZrO2-ES具有更多的活性氧物种空缺和二氧化碳吸附点.
在现场,DRIFTS确定了双酸碳酸盐和单酸碳酸盐作为关键中间体.

结论:

Ni/ZrO2纳米纤维的优越性能归因于高Ni分散,大表面积,丰富的氧气空缺和增强的CO2吸附.
Ni纳米粒子和ZrO2纳米纤维之间的协同效应在催化过程中起着至关重要的作用.
本研究提供了一个设计高效的Ni/ZrO2纳米纤维催化剂的策略,用于低温CO2甲化.

关键词:

二氧化碳的甲化.在现场漂流漂流纳米纤维是一种纳米纤维.氧气空缺的地方.反应机制的反应机制.

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