Study of sour water gas shift using hydrotalcite based sorbents

详细信息    查看全文

• 作者：Yarima Torreiro ; ^{yarima.torreiro@ciemat.es" class="auth_mail" title="E-mail the corresponding author} ; Marta Maroñ ; o ; José ; Mar&iacute ; a Sá ; nchez
• 关键词：Bi-functional catalyst/sorbent materials ; Sour SEWGS reaction ; CO2 capture ; Upgrading of biomass gasification syngas
• 刊名：Fuel
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：187
• 期：Complete
• 页码：58-67
• 全文大小：1624 K

文摘

One of the most promising alternatives to the use of liquid amines and pressure swing adsorwption (PSA) for H₂ production and CO₂ capture in pre-combustion processes is the so called sorption-enhanced water gas shift reaction concept (SEWGS). This study presents the performance in SEWGS of two sorbents, a K-promoted hydrotalcite with Mg/Al ratio = 2, which based on our previous work was selected as the most promising CO₂ capture sorbent tested under sweet water gas shift (WGS) operating conditions, and a bi-functional material prepared by impregnation of the K-promoted hydrotalcite with Co and Mo in order to enhance the catalytic properties of the material.

Short term sour CO₂ capture tests and WGS tests at similar operating conditions (T = 300–350 °C; P = 15 bar) were carried out in order to study the effect of the presence of H₂S in the feed gas stream in the CO₂ capture capacity and catalytic activity of both sorbent materials as well as to compare their performance in developed tests. Finally, the feasibility of using the bifunctional material for sour SEWGS processes was also studied.

Impregnation with Co-Mo did not adversely affect the adsorption capacity of the K-promoted hydrotalcite and enhanced catalytic activity, allowing total CO conversion even after adsorption capacity had been reached.