氧化钇稳定氧化锆上cs促进的Co颗粒作为高压下耐焦甲烷干重整催化剂

IF 2.6 4区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
ChemNanoMat Pub Date : 2024-09-29 DOI:10.1002/cnma.202400460
Penghao Zhang, Juntao Yao, Yi-an Zhu, Zhicheng Liu, Kake Zhu
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引用次数: 0

摘要

甲烷与二氧化碳的重整(干重整)将这两种温室气体共同转化为合成气,为将二氧化碳利用整合到当前的化工基础设施中提供了一种很有前途的方法。工业应用的一个主要障碍是催化剂表面积炭,特别是在工业相关的加压操作条件下。大多数催化研究都是在常压下进行的,但压力的升高对催化剂的设计提出了巨大的挑战。在本研究中,我们证明了Cs可以提高氧化钇稳定氧化锆负载的Co催化剂的碳耐受性,在20 bar, 850°C和计量进料流量下长达100 h,这通常被认为是加速失活的测试条件。与原始Co催化剂相比,在cs促进的废Co催化剂中确定了较少的残留量和大部分CO2气化残留物碳。动力学研究表明,Cs减缓了焦炭的沉积,而原始Co催化剂上的基本反应机理保持不变。Cs+部分吸收CO2生成Cs2CO3, Cs2CO3在相邻Co表面释放O*,促进表面C*氧化,同时抑制碳成核。Cs对Co催化剂的促进作用的发现可能对其他重整催化剂和工艺设计具有指导意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cs-Promoted Co Particles on Yttria-Stabilized Zirconia as Coke-Tolerance Methane Dry Reforming Catalyst under Elevated Pressure

Methane reforming with CO2 (dry reforming) co-converts the two green-house gases into synthesis gas and offers a promising way to integrate CO2 utilization into the current chemical infrastructure. One major obstacle for its industrial deployment is coke deposition on catalyst surface, in particular, under industrially relevant, pressurized operation conditions. Most catalytic investigations are conducted at atmospheric pressure, but the elevation in pressure poses a grand challenge for catalyst design. In this study, we demonstrate that Cs can promote carbon-tolerance of Co catalyst supported on Yttria-stabilized Zirconia under 20 bar, 850 °C with stochiometric feed flow for up to 100 h, which is often regarded as accelerated deactivation testing condition. Lowered amount and mostly CO2 gasifiable residue carbons are determined in Cs-promoted spent Co-catalyst, with respect to pristine Co catalyst. Kinetic studies reveal that Cs slows down coke deposition, while the essential reaction mechanism on pristine Co catalyst remains unaltered. Cs+ moieties absorb CO2 to afford Cs2CO3 that can release O* on adjacent Co surface to facilitate surface C* oxidation and simultaneously suppress carbon nucleation. The disclosure of the promoting effect of Cs on Co catalyst may have implications to other reforming catalyst and process design.

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来源期刊
ChemNanoMat
ChemNanoMat Energy-Energy Engineering and Power Technology
CiteScore
6.10
自引率
2.60%
发文量
236
期刊介绍: ChemNanoMat is a new journal published in close cooperation with the teams of Angewandte Chemie and Advanced Materials, and is the new sister journal to Chemistry—An Asian Journal.
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