An overview on dry reforming of methane: strategies to reduce carbonaceous deactivation of catalysts
An overview on dry reforming of methane: strategies to reduce carbonaceous deactivation of catalysts
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DOI：
10.1039/c6ra20450c
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发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Prasad, R.
中科院分区：
文献类型：
--
作者：
Arora, Shalini;Prasad, R.
甲烷（CH 4）与二氧化碳（CO2）的催化重整（称为甲烷干重整（DRM））产生合成气，其为氢气（H-2）和一氧化碳（CO）的混合物。CH_4 + CO_2 → 2CO + 2H（2），Δ H = 247.3kJ mol（-1），Δ G = 61770 -67.32T。DRM过程最近获得了很多关注，因为它减少了大气中的温室气体（GHG），CO2和CH 4。除了减少GHG之外，DRM工艺产生有价值的化学品（CO + H-2），提供了利用具有显著量的CO2的生物气和天然气的良好方法，与蒸汽重整相比具有作为化学能传输系统的良好能力，并且最终产生用于费托合成的期望的单位H-2/CO比。以Al_2O_3/TiO_2为载体，Ce/ZrO_2为助剂的镍基催化剂在DRM反应中表现出了优异的性能。但是，催化剂的碳失活是该过程中面临的主要问题。大量的研究已经被引用到DRM的各个方面，一些论文也致力于审查碳沉积问题及其补救措施。然而，存在一些缺陷，这是强调在本审查文件的战略，以减少碳失活的催化剂，提高DRM效率，通过适当的催化剂开发，操作条件和流动反应器的设计。废催化剂福尔斯的处置属于危险工业材料的范畴，并且还需要遵守严格的环境法规。因此，对废催化剂的再生和回收技术也进行了讨论。
Catalytic reforming of methane (CH4) with carbon dioxide (CO2), known as dry reforming of methane (DRM), produces synthesis gas, which is a mixture of hydrogen (H-2) and carbon monoxide (CO). CH4 + CO2 -> 2CO + 2H(2), Delta H degrees = 247.3 kJ mol(-1), Delta G = 61 770-67.32T. The DRM process has gained much attention recently as it reduces greenhouse gases (GHG), CO2 and CH4, in the atmosphere. In addition to reducing GHG, the DRM process produces valuable chemicals (CO + H-2), provides a good approach to utilizing biogas and natural gas with a significant amount of CO2, has good capability as a chemical energy transmission system as compared to steam reforming, and finally yields the desired unity H-2/CO ratio for Fischer-Tropsch synthesis. The bimetallic Ni-based catalysts supported on Al2O3/TiO2 and promoted with Ce/ZrO2 show remarkable performances in the DRM process. But, carbonaceous deactivation of the catalysts is the major problem faced during this process. Numerous studies have been cited on various aspects of DRM, and some papers are also devoted to reviewing carbonaceous deposition problems and their remedies. However, some lacunae exist, which are highlighted in the present review paper on strategies to reduce the carbonaceous deactivation of catalysts for improved DRM efficiency by appropriate catalyst development, operating conditions, and flow reactor designs. The disposal of spent catalysts falls under the category of hazardous industrial materials and is also required to comply with stringent environmental regulations. Therefore, regeneration and reclamation techniques for spent catalysts have also been discussed.