报告五：CO₂capture and catalytic conversion to added value products through the use of different alkaline ceramics

时间：2017年11月20日下午3:30-5:30

地点：学研A106

报告人简介：

Heriberto Pfeiffer教授，墨西哥人，1971年生。

教育经历：

1990–1995墨西哥瓜纳华托大学（Universidad de Guanajuato）化学系，学士

1995–1997墨西哥大都会自治大学（Universidad Autónoma Metropolitana）化学系，硕士

1998–2001墨西哥大都会自治大学（Universidad Autónoma Metropolitana）化学系，博士

工作经历：

2004.5 – ,墨西哥国立自治大学（Universidad Nacional Autónoma de México），材料研究所，研究员

2002.12 – 2004.3法国南特大学综合理工学院（?cole Polytechnique de l’Université de Nantes），博士后

2001.5 – 2002.11英国剑桥大学（University of Cambridge）博士后

Heriberto Pfeiffer教授的研究方向主要为吸附和催化在能源和环境中的应用，如CO₂捕获及资源化利用，催化过程（有机分子重整，化学吸附法从合成气中分离CO，NOx还原及制H₂等），此外，对高温致密膜用于CO₂分离和采用非均相催化剂制备生物柴油方面也有一定的研究。目前已在国际期刊上发表学术论文120余篇，撰写书籍章节5个，申请国家专利1项。

报告内容摘要：

In the last two decades, alkaline ceramics have been analyzed as possible high temperature CO₂captors.The most studied ceramics are the lithium orthosilicate, lithium aluminate, lithium and sodium zirconates and lithium cuprate, among others. These ceramics are able to trap CO₂, chemically, at different temperature ranges (30-820 °C) under different physicochemical conditions. These ceramics trap CO₂throughout a chemisorption process. Initially, alkaline ceramic particles react with CO₂at the surface. This superficial reaction implies the formation of an external shell (alkaline carbonate and secondary phases). Once the external shell is produced, reaction mechanism is controlled by diffusion processes. Therefore, the correct understanding of all these phenomena is very important during the selection of ideal CO₂capture conditions. Conversely, the same alkaline ceramics have been tested in different catalytic reactions, where carbon dioxide (CO₂) and/or methane (CH₄) are used. Some of these reactions are methane reforming (called dry reforming) and water gas shift. These reactions produce syngas (CO+H₂), which can be used in different energetic and organic applications. Additionally, these reactions are also environmentally important, as CO₂and CH₄(perhaps the two most important greenhouse gases) are catalytically converted into added value products, such as hydrocarbons and oxygenated compounds. Finally, some of these lithium and sodium ceramics have been tested as possible bifunctional materials for CO oxidation and subsequent CO₂chemisorption. This process would be used in hydrogen enrichment from syngas mixture. Therefore, the aim of this presentation is to show some recent advances in CO₂capture on lithium and sodium ceramics (under different physicochemical conditions) and to show as well how CO₂chemically trapped can be catalyzed to added value products through the syngas production at different temperature ranges and the use of these ceramics as bifunctional materials for CO oxidation and subsequent CO₂chemisorption processes.